http://git-wip-us.apache.org/repos/asf/hbase-site/blob/8f09a71d/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.StoreFileCostFunction.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.StoreFileCostFunction.html b/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.StoreFileCostFunction.html index c7d99b2..9d1542c 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.StoreFileCostFunction.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.StoreFileCostFunction.html @@ -382,1357 +382,1365 @@ <span class="sourceLineNo">374</span> for (int i = 0; i < this.curFunctionCosts.length; i++) {<a name="line.374"></a> <span class="sourceLineNo">375</span> curFunctionCosts[i] = tempFunctionCosts[i];<a name="line.375"></a> <span class="sourceLineNo">376</span> }<a name="line.376"></a> -<span class="sourceLineNo">377</span> LOG.info("start StochasticLoadBalancer.balancer, initCost=" + currentCost + ", functionCost="<a name="line.377"></a> -<span class="sourceLineNo">378</span> + functionCost());<a name="line.378"></a> +<span class="sourceLineNo">377</span> double initCost = currentCost;<a name="line.377"></a> +<span class="sourceLineNo">378</span> double newCost = currentCost;<a name="line.378"></a> <span class="sourceLineNo">379</span><a name="line.379"></a> -<span class="sourceLineNo">380</span> double initCost = currentCost;<a name="line.380"></a> -<span class="sourceLineNo">381</span> double newCost = currentCost;<a name="line.381"></a> -<span class="sourceLineNo">382</span><a name="line.382"></a> -<span class="sourceLineNo">383</span> long computedMaxSteps;<a name="line.383"></a> -<span class="sourceLineNo">384</span> if (runMaxSteps) {<a name="line.384"></a> -<span class="sourceLineNo">385</span> computedMaxSteps = Math.max(this.maxSteps,<a name="line.385"></a> -<span class="sourceLineNo">386</span> ((long)cluster.numRegions * (long)this.stepsPerRegion * (long)cluster.numServers));<a name="line.386"></a> -<span class="sourceLineNo">387</span> } else {<a name="line.387"></a> -<span class="sourceLineNo">388</span> computedMaxSteps = Math.min(this.maxSteps,<a name="line.388"></a> -<span class="sourceLineNo">389</span> ((long)cluster.numRegions * (long)this.stepsPerRegion * (long)cluster.numServers));<a name="line.389"></a> -<span class="sourceLineNo">390</span> }<a name="line.390"></a> -<span class="sourceLineNo">391</span> // Perform a stochastic walk to see if we can get a good fit.<a name="line.391"></a> -<span class="sourceLineNo">392</span> long step;<a name="line.392"></a> -<span class="sourceLineNo">393</span><a name="line.393"></a> -<span class="sourceLineNo">394</span> for (step = 0; step < computedMaxSteps; step++) {<a name="line.394"></a> -<span class="sourceLineNo">395</span> Cluster.Action action = nextAction(cluster);<a name="line.395"></a> -<span class="sourceLineNo">396</span><a name="line.396"></a> -<span class="sourceLineNo">397</span> if (action.type == Type.NULL) {<a name="line.397"></a> -<span class="sourceLineNo">398</span> continue;<a name="line.398"></a> -<span class="sourceLineNo">399</span> }<a name="line.399"></a> -<span class="sourceLineNo">400</span><a name="line.400"></a> -<span class="sourceLineNo">401</span> cluster.doAction(action);<a name="line.401"></a> -<span class="sourceLineNo">402</span> updateCostsWithAction(cluster, action);<a name="line.402"></a> -<span class="sourceLineNo">403</span><a name="line.403"></a> -<span class="sourceLineNo">404</span> newCost = computeCost(cluster, currentCost);<a name="line.404"></a> -<span class="sourceLineNo">405</span><a name="line.405"></a> -<span class="sourceLineNo">406</span> // Should this be kept?<a name="line.406"></a> -<span class="sourceLineNo">407</span> if (newCost < currentCost) {<a name="line.407"></a> -<span class="sourceLineNo">408</span> currentCost = newCost;<a name="line.408"></a> -<span class="sourceLineNo">409</span><a name="line.409"></a> -<span class="sourceLineNo">410</span> // save for JMX<a name="line.410"></a> -<span class="sourceLineNo">411</span> curOverallCost = currentCost;<a name="line.411"></a> -<span class="sourceLineNo">412</span> for (int i = 0; i < this.curFunctionCosts.length; i++) {<a name="line.412"></a> -<span class="sourceLineNo">413</span> curFunctionCosts[i] = tempFunctionCosts[i];<a name="line.413"></a> -<span class="sourceLineNo">414</span> }<a name="line.414"></a> -<span class="sourceLineNo">415</span> } else {<a name="line.415"></a> -<span class="sourceLineNo">416</span> // Put things back the way they were before.<a name="line.416"></a> -<span class="sourceLineNo">417</span> // TODO: undo by remembering old values<a name="line.417"></a> -<span class="sourceLineNo">418</span> Action undoAction = action.undoAction();<a name="line.418"></a> -<span class="sourceLineNo">419</span> cluster.doAction(undoAction);<a name="line.419"></a> -<span class="sourceLineNo">420</span> updateCostsWithAction(cluster, undoAction);<a name="line.420"></a> -<span class="sourceLineNo">421</span> }<a name="line.421"></a> -<span class="sourceLineNo">422</span><a name="line.422"></a> -<span class="sourceLineNo">423</span> if (EnvironmentEdgeManager.currentTime() - startTime ><a name="line.423"></a> -<span class="sourceLineNo">424</span> maxRunningTime) {<a name="line.424"></a> -<span class="sourceLineNo">425</span> break;<a name="line.425"></a> -<span class="sourceLineNo">426</span> }<a name="line.426"></a> -<span class="sourceLineNo">427</span> }<a name="line.427"></a> -<span class="sourceLineNo">428</span> long endTime = EnvironmentEdgeManager.currentTime();<a name="line.428"></a> -<span class="sourceLineNo">429</span><a name="line.429"></a> -<span class="sourceLineNo">430</span> metricsBalancer.balanceCluster(endTime - startTime);<a name="line.430"></a> -<span class="sourceLineNo">431</span><a name="line.431"></a> -<span class="sourceLineNo">432</span> // update costs metrics<a name="line.432"></a> -<span class="sourceLineNo">433</span> updateStochasticCosts(tableName, curOverallCost, curFunctionCosts);<a name="line.433"></a> -<span class="sourceLineNo">434</span> if (initCost > currentCost) {<a name="line.434"></a> -<span class="sourceLineNo">435</span> plans = createRegionPlans(cluster);<a name="line.435"></a> -<span class="sourceLineNo">436</span> LOG.info("Finished computing new load balance plan. Computation took {}" +<a name="line.436"></a> -<span class="sourceLineNo">437</span> " to try {} different iterations. Found a solution that moves " +<a name="line.437"></a> -<span class="sourceLineNo">438</span> "{} regions; Going from a computed cost of {}" +<a name="line.438"></a> -<span class="sourceLineNo">439</span> " to a new cost of {}", java.time.Duration.ofMillis(endTime - startTime),<a name="line.439"></a> -<span class="sourceLineNo">440</span> step, plans.size(), initCost, currentCost);<a name="line.440"></a> -<span class="sourceLineNo">441</span> return plans;<a name="line.441"></a> -<span class="sourceLineNo">442</span> }<a name="line.442"></a> -<span class="sourceLineNo">443</span> LOG.info("Could not find a better load balance plan. Tried {} different configurations in " +<a name="line.443"></a> -<span class="sourceLineNo">444</span> "{}, and did not find anything with a computed cost less than {}", step,<a name="line.444"></a> -<span class="sourceLineNo">445</span> java.time.Duration.ofMillis(endTime - startTime), initCost);<a name="line.445"></a> -<span class="sourceLineNo">446</span> return null;<a name="line.446"></a> -<span class="sourceLineNo">447</span> }<a name="line.447"></a> -<span class="sourceLineNo">448</span><a name="line.448"></a> -<span class="sourceLineNo">449</span> /**<a name="line.449"></a> -<span class="sourceLineNo">450</span> * update costs to JMX<a name="line.450"></a> -<span class="sourceLineNo">451</span> */<a name="line.451"></a> -<span class="sourceLineNo">452</span> private void updateStochasticCosts(TableName tableName, Double overall, Double[] subCosts) {<a name="line.452"></a> -<span class="sourceLineNo">453</span> if (tableName == null) return;<a name="line.453"></a> -<span class="sourceLineNo">454</span><a name="line.454"></a> -<span class="sourceLineNo">455</span> // check if the metricsBalancer is MetricsStochasticBalancer before casting<a name="line.455"></a> -<span class="sourceLineNo">456</span> if (metricsBalancer instanceof MetricsStochasticBalancer) {<a name="line.456"></a> -<span class="sourceLineNo">457</span> MetricsStochasticBalancer balancer = (MetricsStochasticBalancer) metricsBalancer;<a name="line.457"></a> -<span class="sourceLineNo">458</span> // overall cost<a name="line.458"></a> -<span class="sourceLineNo">459</span> balancer.updateStochasticCost(tableName.getNameAsString(),<a name="line.459"></a> -<span class="sourceLineNo">460</span> "Overall", "Overall cost", overall);<a name="line.460"></a> -<span class="sourceLineNo">461</span><a name="line.461"></a> -<span class="sourceLineNo">462</span> // each cost function<a name="line.462"></a> -<span class="sourceLineNo">463</span> for (int i = 0; i < costFunctions.length; i++) {<a name="line.463"></a> -<span class="sourceLineNo">464</span> CostFunction costFunction = costFunctions[i];<a name="line.464"></a> -<span class="sourceLineNo">465</span> String costFunctionName = costFunction.getClass().getSimpleName();<a name="line.465"></a> -<span class="sourceLineNo">466</span> Double costPercent = (overall == 0) ? 0 : (subCosts[i] / overall);<a name="line.466"></a> -<span class="sourceLineNo">467</span> // TODO: cost function may need a specific description<a name="line.467"></a> -<span class="sourceLineNo">468</span> balancer.updateStochasticCost(tableName.getNameAsString(), costFunctionName,<a name="line.468"></a> -<span class="sourceLineNo">469</span> "The percent of " + costFunctionName, costPercent);<a name="line.469"></a> -<span class="sourceLineNo">470</span> }<a name="line.470"></a> -<span class="sourceLineNo">471</span> }<a name="line.471"></a> -<span class="sourceLineNo">472</span> }<a name="line.472"></a> -<span class="sourceLineNo">473</span><a name="line.473"></a> -<span class="sourceLineNo">474</span> private String functionCost() {<a name="line.474"></a> -<span class="sourceLineNo">475</span> StringBuilder builder = new StringBuilder();<a name="line.475"></a> -<span class="sourceLineNo">476</span> for (CostFunction c:costFunctions) {<a name="line.476"></a> -<span class="sourceLineNo">477</span> builder.append(c.getClass().getSimpleName());<a name="line.477"></a> -<span class="sourceLineNo">478</span> builder.append(" : (");<a name="line.478"></a> -<span class="sourceLineNo">479</span> builder.append(c.getMultiplier());<a name="line.479"></a> -<span class="sourceLineNo">480</span> builder.append(", ");<a name="line.480"></a> -<span class="sourceLineNo">481</span> builder.append(c.cost());<a name="line.481"></a> -<span class="sourceLineNo">482</span> builder.append("); ");<a name="line.482"></a> -<span class="sourceLineNo">483</span> }<a name="line.483"></a> -<span class="sourceLineNo">484</span> return builder.toString();<a name="line.484"></a> -<span class="sourceLineNo">485</span> }<a name="line.485"></a> -<span class="sourceLineNo">486</span><a name="line.486"></a> -<span class="sourceLineNo">487</span> /**<a name="line.487"></a> -<span class="sourceLineNo">488</span> * Create all of the RegionPlan's needed to move from the initial cluster state to the desired<a name="line.488"></a> -<span class="sourceLineNo">489</span> * state.<a name="line.489"></a> -<span class="sourceLineNo">490</span> *<a name="line.490"></a> -<span class="sourceLineNo">491</span> * @param cluster The state of the cluster<a name="line.491"></a> -<span class="sourceLineNo">492</span> * @return List of RegionPlan's that represent the moves needed to get to desired final state.<a name="line.492"></a> -<span class="sourceLineNo">493</span> */<a name="line.493"></a> -<span class="sourceLineNo">494</span> private List<RegionPlan> createRegionPlans(Cluster cluster) {<a name="line.494"></a> -<span class="sourceLineNo">495</span> List<RegionPlan> plans = new LinkedList<>();<a name="line.495"></a> -<span class="sourceLineNo">496</span> for (int regionIndex = 0;<a name="line.496"></a> -<span class="sourceLineNo">497</span> regionIndex < cluster.regionIndexToServerIndex.length; regionIndex++) {<a name="line.497"></a> -<span class="sourceLineNo">498</span> int initialServerIndex = cluster.initialRegionIndexToServerIndex[regionIndex];<a name="line.498"></a> -<span class="sourceLineNo">499</span> int newServerIndex = cluster.regionIndexToServerIndex[regionIndex];<a name="line.499"></a> -<span class="sourceLineNo">500</span><a name="line.500"></a> -<span class="sourceLineNo">501</span> if (initialServerIndex != newServerIndex) {<a name="line.501"></a> -<span class="sourceLineNo">502</span> RegionInfo region = cluster.regions[regionIndex];<a name="line.502"></a> -<span class="sourceLineNo">503</span> ServerName initialServer = cluster.servers[initialServerIndex];<a name="line.503"></a> -<span class="sourceLineNo">504</span> ServerName newServer = cluster.servers[newServerIndex];<a name="line.504"></a> -<span class="sourceLineNo">505</span><a name="line.505"></a> -<span class="sourceLineNo">506</span> if (LOG.isTraceEnabled()) {<a name="line.506"></a> -<span class="sourceLineNo">507</span> LOG.trace("Moving Region " + region.getEncodedName() + " from server "<a name="line.507"></a> -<span class="sourceLineNo">508</span> + initialServer.getHostname() + " to " + newServer.getHostname());<a name="line.508"></a> -<span class="sourceLineNo">509</span> }<a name="line.509"></a> -<span class="sourceLineNo">510</span> RegionPlan rp = new RegionPlan(region, initialServer, newServer);<a name="line.510"></a> -<span class="sourceLineNo">511</span> plans.add(rp);<a name="line.511"></a> -<span class="sourceLineNo">512</span> }<a name="line.512"></a> -<span class="sourceLineNo">513</span> }<a name="line.513"></a> -<span class="sourceLineNo">514</span> return plans;<a name="line.514"></a> -<span class="sourceLineNo">515</span> }<a name="line.515"></a> -<span class="sourceLineNo">516</span><a name="line.516"></a> -<span class="sourceLineNo">517</span> /**<a name="line.517"></a> -<span class="sourceLineNo">518</span> * Store the current region loads.<a name="line.518"></a> -<span class="sourceLineNo">519</span> */<a name="line.519"></a> -<span class="sourceLineNo">520</span> private synchronized void updateRegionLoad() {<a name="line.520"></a> -<span class="sourceLineNo">521</span> // We create a new hashmap so that regions that are no longer there are removed.<a name="line.521"></a> -<span class="sourceLineNo">522</span> // However we temporarily need the old loads so we can use them to keep the rolling average.<a name="line.522"></a> -<span class="sourceLineNo">523</span> Map<String, Deque<BalancerRegionLoad>> oldLoads = loads;<a name="line.523"></a> -<span class="sourceLineNo">524</span> loads = new HashMap<>();<a name="line.524"></a> -<span class="sourceLineNo">525</span><a name="line.525"></a> -<span class="sourceLineNo">526</span> clusterStatus.getLiveServerMetrics().forEach((ServerName sn, ServerMetrics sm) -> {<a name="line.526"></a> -<span class="sourceLineNo">527</span> sm.getRegionMetrics().forEach((byte[] regionName, RegionMetrics rm) -> {<a name="line.527"></a> -<span class="sourceLineNo">528</span> Deque<BalancerRegionLoad> rLoads = oldLoads.get(Bytes.toString(regionName));<a name="line.528"></a> -<span class="sourceLineNo">529</span> if (rLoads == null) {<a name="line.529"></a> -<span class="sourceLineNo">530</span> rLoads = new ArrayDeque<>(numRegionLoadsToRemember + 1);<a name="line.530"></a> -<span class="sourceLineNo">531</span> } else if (rLoads.size() >= numRegionLoadsToRemember) {<a name="line.531"></a> -<span class="sourceLineNo">532</span> rLoads.remove();<a name="line.532"></a> -<span class="sourceLineNo">533</span> }<a name="line.533"></a> -<span class="sourceLineNo">534</span> rLoads.add(new BalancerRegionLoad(rm));<a name="line.534"></a> -<span class="sourceLineNo">535</span> loads.put(Bytes.toString(regionName), rLoads);<a name="line.535"></a> -<span class="sourceLineNo">536</span> });<a name="line.536"></a> -<span class="sourceLineNo">537</span> });<a name="line.537"></a> -<span class="sourceLineNo">538</span><a name="line.538"></a> -<span class="sourceLineNo">539</span> for(CostFromRegionLoadFunction cost : regionLoadFunctions) {<a name="line.539"></a> -<span class="sourceLineNo">540</span> cost.setLoads(loads);<a name="line.540"></a> -<span class="sourceLineNo">541</span> }<a name="line.541"></a> -<span class="sourceLineNo">542</span> }<a name="line.542"></a> -<span class="sourceLineNo">543</span><a name="line.543"></a> -<span class="sourceLineNo">544</span> protected void initCosts(Cluster cluster) {<a name="line.544"></a> -<span class="sourceLineNo">545</span> for (CostFunction c:costFunctions) {<a name="line.545"></a> -<span class="sourceLineNo">546</span> c.init(cluster);<a name="line.546"></a> -<span class="sourceLineNo">547</span> }<a name="line.547"></a> -<span class="sourceLineNo">548</span> }<a name="line.548"></a> -<span class="sourceLineNo">549</span><a name="line.549"></a> -<span class="sourceLineNo">550</span> protected void updateCostsWithAction(Cluster cluster, Action action) {<a name="line.550"></a> -<span class="sourceLineNo">551</span> for (CostFunction c : costFunctions) {<a name="line.551"></a> -<span class="sourceLineNo">552</span> c.postAction(action);<a name="line.552"></a> -<span class="sourceLineNo">553</span> }<a name="line.553"></a> -<span class="sourceLineNo">554</span> }<a name="line.554"></a> -<span class="sourceLineNo">555</span><a name="line.555"></a> -<span class="sourceLineNo">556</span> /**<a name="line.556"></a> -<span class="sourceLineNo">557</span> * Get the names of the cost functions<a name="line.557"></a> -<span class="sourceLineNo">558</span> */<a name="line.558"></a> -<span 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name="line.570"></a> -<span class="sourceLineNo">571</span> * This is the main cost function. 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This cost is an<a name="line.576"></a> -<span class="sourceLineNo">577</span> * aggregate of all individual cost functions.<a name="line.577"></a> -<span class="sourceLineNo">578</span> */<a name="line.578"></a> -<span class="sourceLineNo">579</span> protected double computeCost(Cluster cluster, double previousCost) {<a name="line.579"></a> -<span class="sourceLineNo">580</span> double total = 0;<a name="line.580"></a> -<span class="sourceLineNo">581</span><a name="line.581"></a> -<span class="sourceLineNo">582</span> for (int i = 0; i < costFunctions.length; i++) {<a name="line.582"></a> -<span class="sourceLineNo">583</span> CostFunction c = costFunctions[i];<a name="line.583"></a> -<span class="sourceLineNo">584</span> this.tempFunctionCosts[i] = 0.0;<a name="line.584"></a> -<span class="sourceLineNo">585</span><a name="line.585"></a> -<span class="sourceLineNo">586</span> if (c.getMultiplier() <= 0) {<a name="line.586"></a> -<span class="sourceLineNo">587</span> continue;<a name="line.587"></a> -<span class="sourceLineNo">588</span> }<a name="line.588"></a> +<span class="sourceLineNo">380</span> long computedMaxSteps;<a name="line.380"></a> +<span class="sourceLineNo">381</span> if (runMaxSteps) {<a name="line.381"></a> +<span class="sourceLineNo">382</span> computedMaxSteps = Math.max(this.maxSteps,<a name="line.382"></a> +<span class="sourceLineNo">383</span> ((long)cluster.numRegions * (long)this.stepsPerRegion * (long)cluster.numServers));<a name="line.383"></a> +<span class="sourceLineNo">384</span> } else {<a name="line.384"></a> +<span class="sourceLineNo">385</span> long calculatedMaxSteps = (long)cluster.numRegions * (long)this.stepsPerRegion *<a name="line.385"></a> +<span class="sourceLineNo">386</span> (long)cluster.numServers;<a name="line.386"></a> +<span class="sourceLineNo">387</span> computedMaxSteps = Math.min(this.maxSteps, calculatedMaxSteps);<a name="line.387"></a> +<span class="sourceLineNo">388</span> if (calculatedMaxSteps > maxSteps) {<a name="line.388"></a> +<span class="sourceLineNo">389</span> LOG.warn("calculatedMaxSteps:{} for loadbalancer's stochastic walk is larger than "<a name="line.389"></a> +<span class="sourceLineNo">390</span> + "maxSteps:{}. Hence load balancing may not work well. Setting parameter "<a name="line.390"></a> +<span class="sourceLineNo">391</span> + "\"hbase.master.balancer.stochastic.runMaxSteps\" to true can overcome this issue."<a name="line.391"></a> +<span class="sourceLineNo">392</span> + "(This config change does not require service restart)", calculatedMaxSteps,<a name="line.392"></a> +<span class="sourceLineNo">393</span> maxRunningTime);<a name="line.393"></a> +<span class="sourceLineNo">394</span> }<a name="line.394"></a> +<span class="sourceLineNo">395</span> }<a name="line.395"></a> +<span class="sourceLineNo">396</span> LOG.info("start StochasticLoadBalancer.balancer, initCost=" + currentCost + ", functionCost="<a name="line.396"></a> +<span class="sourceLineNo">397</span> + functionCost() + " computedMaxSteps: " + computedMaxSteps);<a name="line.397"></a> +<span class="sourceLineNo">398</span><a name="line.398"></a> +<span class="sourceLineNo">399</span> // Perform a stochastic walk to see if we can get a good fit.<a name="line.399"></a> +<span class="sourceLineNo">400</span> long step;<a name="line.400"></a> +<span class="sourceLineNo">401</span><a name="line.401"></a> +<span class="sourceLineNo">402</span> for (step = 0; step < computedMaxSteps; step++) {<a name="line.402"></a> +<span class="sourceLineNo">403</span> Cluster.Action action = nextAction(cluster);<a name="line.403"></a> +<span class="sourceLineNo">404</span><a name="line.404"></a> +<span class="sourceLineNo">405</span> if (action.type == Type.NULL) {<a name="line.405"></a> +<span class="sourceLineNo">406</span> continue;<a name="line.406"></a> +<span class="sourceLineNo">407</span> }<a name="line.407"></a> +<span class="sourceLineNo">408</span><a name="line.408"></a> +<span class="sourceLineNo">409</span> cluster.doAction(action);<a name="line.409"></a> +<span class="sourceLineNo">410</span> updateCostsWithAction(cluster, action);<a name="line.410"></a> +<span class="sourceLineNo">411</span><a name="line.411"></a> +<span class="sourceLineNo">412</span> newCost = computeCost(cluster, currentCost);<a name="line.412"></a> +<span class="sourceLineNo">413</span><a name="line.413"></a> +<span class="sourceLineNo">414</span> // Should this be kept?<a name="line.414"></a> +<span class="sourceLineNo">415</span> if (newCost < currentCost) {<a name="line.415"></a> +<span class="sourceLineNo">416</span> currentCost = newCost;<a name="line.416"></a> +<span class="sourceLineNo">417</span><a name="line.417"></a> +<span class="sourceLineNo">418</span> // save for JMX<a name="line.418"></a> +<span class="sourceLineNo">419</span> curOverallCost = currentCost;<a name="line.419"></a> +<span class="sourceLineNo">420</span> for (int i = 0; i < this.curFunctionCosts.length; i++) {<a name="line.420"></a> +<span class="sourceLineNo">421</span> curFunctionCosts[i] = tempFunctionCosts[i];<a name="line.421"></a> +<span class="sourceLineNo">422</span> }<a name="line.422"></a> +<span class="sourceLineNo">423</span> } else {<a name="line.423"></a> +<span class="sourceLineNo">424</span> // Put things back the way they were before.<a name="line.424"></a> +<span class="sourceLineNo">425</span> // TODO: undo by remembering old values<a name="line.425"></a> +<span class="sourceLineNo">426</span> Action undoAction = action.undoAction();<a name="line.426"></a> +<span class="sourceLineNo">427</span> cluster.doAction(undoAction);<a name="line.427"></a> +<span class="sourceLineNo">428</span> updateCostsWithAction(cluster, undoAction);<a name="line.428"></a> +<span class="sourceLineNo">429</span> }<a name="line.429"></a> +<span class="sourceLineNo">430</span><a name="line.430"></a> +<span class="sourceLineNo">431</span> if (EnvironmentEdgeManager.currentTime() - startTime ><a name="line.431"></a> +<span class="sourceLineNo">432</span> maxRunningTime) {<a name="line.432"></a> +<span class="sourceLineNo">433</span> break;<a name="line.433"></a> +<span class="sourceLineNo">434</span> }<a name="line.434"></a> +<span class="sourceLineNo">435</span> }<a name="line.435"></a> +<span class="sourceLineNo">436</span> long endTime = EnvironmentEdgeManager.currentTime();<a name="line.436"></a> +<span class="sourceLineNo">437</span><a name="line.437"></a> +<span class="sourceLineNo">438</span> metricsBalancer.balanceCluster(endTime - startTime);<a name="line.438"></a> +<span class="sourceLineNo">439</span><a name="line.439"></a> +<span class="sourceLineNo">440</span> // update costs metrics<a name="line.440"></a> +<span class="sourceLineNo">441</span> updateStochasticCosts(tableName, curOverallCost, curFunctionCosts);<a name="line.441"></a> +<span class="sourceLineNo">442</span> if (initCost > currentCost) {<a name="line.442"></a> +<span class="sourceLineNo">443</span> plans = createRegionPlans(cluster);<a name="line.443"></a> +<span class="sourceLineNo">444</span> LOG.info("Finished computing new load balance plan. Computation took {}" +<a name="line.444"></a> +<span class="sourceLineNo">445</span> " to try {} different iterations. Found a solution that moves " +<a name="line.445"></a> +<span class="sourceLineNo">446</span> "{} regions; Going from a computed cost of {}" +<a name="line.446"></a> +<span class="sourceLineNo">447</span> " to a new cost of {}", java.time.Duration.ofMillis(endTime - startTime),<a name="line.447"></a> +<span class="sourceLineNo">448</span> step, plans.size(), initCost, currentCost);<a name="line.448"></a> +<span class="sourceLineNo">449</span> return plans;<a name="line.449"></a> +<span class="sourceLineNo">450</span> }<a name="line.450"></a> +<span class="sourceLineNo">451</span> LOG.info("Could not find a better load balance plan. Tried {} different configurations in " +<a name="line.451"></a> +<span class="sourceLineNo">452</span> "{}, and did not find anything with a computed cost less than {}", step,<a name="line.452"></a> +<span class="sourceLineNo">453</span> java.time.Duration.ofMillis(endTime - startTime), initCost);<a name="line.453"></a> +<span class="sourceLineNo">454</span> return null;<a name="line.454"></a> +<span class="sourceLineNo">455</span> }<a name="line.455"></a> +<span class="sourceLineNo">456</span><a name="line.456"></a> +<span class="sourceLineNo">457</span> /**<a name="line.457"></a> +<span class="sourceLineNo">458</span> * update costs to JMX<a name="line.458"></a> +<span class="sourceLineNo">459</span> */<a name="line.459"></a> +<span class="sourceLineNo">460</span> private void updateStochasticCosts(TableName tableName, Double overall, Double[] subCosts) {<a name="line.460"></a> +<span class="sourceLineNo">461</span> if (tableName == null) return;<a name="line.461"></a> +<span class="sourceLineNo">462</span><a name="line.462"></a> +<span class="sourceLineNo">463</span> // check if the metricsBalancer is MetricsStochasticBalancer before casting<a name="line.463"></a> +<span class="sourceLineNo">464</span> if (metricsBalancer instanceof MetricsStochasticBalancer) {<a name="line.464"></a> +<span class="sourceLineNo">465</span> MetricsStochasticBalancer balancer = (MetricsStochasticBalancer) metricsBalancer;<a name="line.465"></a> +<span class="sourceLineNo">466</span> // overall cost<a name="line.466"></a> +<span class="sourceLineNo">467</span> balancer.updateStochasticCost(tableName.getNameAsString(),<a name="line.467"></a> +<span class="sourceLineNo">468</span> "Overall", "Overall cost", overall);<a name="line.468"></a> +<span class="sourceLineNo">469</span><a name="line.469"></a> +<span class="sourceLineNo">470</span> // each cost function<a name="line.470"></a> +<span class="sourceLineNo">471</span> for (int i = 0; i < costFunctions.length; i++) {<a name="line.471"></a> +<span class="sourceLineNo">472</span> CostFunction costFunction = costFunctions[i];<a name="line.472"></a> +<span class="sourceLineNo">473</span> String costFunctionName = costFunction.getClass().getSimpleName();<a name="line.473"></a> +<span class="sourceLineNo">474</span> Double costPercent = (overall == 0) ? 0 : (subCosts[i] / overall);<a name="line.474"></a> +<span class="sourceLineNo">475</span> // TODO: cost function may need a specific description<a name="line.475"></a> +<span class="sourceLineNo">476</span> balancer.updateStochasticCost(tableName.getNameAsString(), costFunctionName,<a name="line.476"></a> +<span class="sourceLineNo">477</span> "The percent of " + costFunctionName, costPercent);<a name="line.477"></a> +<span class="sourceLineNo">478</span> }<a name="line.478"></a> +<span class="sourceLineNo">479</span> }<a name="line.479"></a> +<span class="sourceLineNo">480</span> }<a name="line.480"></a> +<span class="sourceLineNo">481</span><a name="line.481"></a> +<span class="sourceLineNo">482</span> private String functionCost() {<a name="line.482"></a> +<span class="sourceLineNo">483</span> StringBuilder builder = new StringBuilder();<a name="line.483"></a> +<span class="sourceLineNo">484</span> for (CostFunction c:costFunctions) {<a name="line.484"></a> +<span class="sourceLineNo">485</span> builder.append(c.getClass().getSimpleName());<a name="line.485"></a> +<span class="sourceLineNo">486</span> builder.append(" : (");<a name="line.486"></a> +<span class="sourceLineNo">487</span> builder.append(c.getMultiplier());<a name="line.487"></a> +<span class="sourceLineNo">488</span> builder.append(", ");<a name="line.488"></a> +<span class="sourceLineNo">489</span> builder.append(c.cost());<a name="line.489"></a> +<span class="sourceLineNo">490</span> builder.append("); ");<a name="line.490"></a> +<span class="sourceLineNo">491</span> }<a name="line.491"></a> +<span class="sourceLineNo">492</span> return builder.toString();<a name="line.492"></a> +<span class="sourceLineNo">493</span> }<a name="line.493"></a> +<span class="sourceLineNo">494</span><a name="line.494"></a> +<span class="sourceLineNo">495</span> /**<a name="line.495"></a> +<span class="sourceLineNo">496</span> * Create all of the RegionPlan's needed to move from the initial cluster state to the desired<a name="line.496"></a> +<span class="sourceLineNo">497</span> * state.<a name="line.497"></a> +<span class="sourceLineNo">498</span> *<a name="line.498"></a> +<span class="sourceLineNo">499</span> * @param cluster The state of the cluster<a name="line.499"></a> +<span class="sourceLineNo">500</span> * @return List of RegionPlan's that represent the moves needed to get to desired final state.<a name="line.500"></a> +<span class="sourceLineNo">501</span> */<a name="line.501"></a> +<span class="sourceLineNo">502</span> private List<RegionPlan> createRegionPlans(Cluster cluster) {<a name="line.502"></a> +<span class="sourceLineNo">503</span> List<RegionPlan> plans = new LinkedList<>();<a name="line.503"></a> +<span class="sourceLineNo">504</span> for (int regionIndex = 0;<a name="line.504"></a> +<span class="sourceLineNo">505</span> regionIndex < cluster.regionIndexToServerIndex.length; regionIndex++) {<a name="line.505"></a> +<span class="sourceLineNo">506</span> int initialServerIndex = cluster.initialRegionIndexToServerIndex[regionIndex];<a name="line.506"></a> +<span class="sourceLineNo">507</span> int newServerIndex = cluster.regionIndexToServerIndex[regionIndex];<a name="line.507"></a> +<span class="sourceLineNo">508</span><a name="line.508"></a> +<span class="sourceLineNo">509</span> if (initialServerIndex != newServerIndex) {<a name="line.509"></a> +<span class="sourceLineNo">510</span> RegionInfo region = cluster.regions[regionIndex];<a name="line.510"></a> +<span class="sourceLineNo">511</span> ServerName initialServer = cluster.servers[initialServerIndex];<a name="line.511"></a> +<span class="sourceLineNo">512</span> ServerName newServer = cluster.servers[newServerIndex];<a name="line.512"></a> +<span class="sourceLineNo">513</span><a name="line.513"></a> +<span class="sourceLineNo">514</span> if (LOG.isTraceEnabled()) {<a name="line.514"></a> +<span class="sourceLineNo">515</span> LOG.trace("Moving Region " + region.getEncodedName() + " from server "<a name="line.515"></a> +<span class="sourceLineNo">516</span> + initialServer.getHostname() + " to " + newServer.getHostname());<a name="line.516"></a> +<span class="sourceLineNo">517</span> }<a name="line.517"></a> +<span class="sourceLineNo">518</span> RegionPlan rp = new RegionPlan(region, initialServer, newServer);<a name="line.518"></a> +<span class="sourceLineNo">519</span> plans.add(rp);<a name="line.519"></a> +<span class="sourceLineNo">520</span> }<a name="line.520"></a> +<span class="sourceLineNo">521</span> }<a name="line.521"></a> +<span class="sourceLineNo">522</span> return plans;<a name="line.522"></a> +<span class="sourceLineNo">523</span> }<a name="line.523"></a> +<span class="sourceLineNo">524</span><a name="line.524"></a> +<span class="sourceLineNo">525</span> /**<a name="line.525"></a> +<span class="sourceLineNo">526</span> * Store the current region loads.<a name="line.526"></a> +<span class="sourceLineNo">527</span> */<a name="line.527"></a> +<span class="sourceLineNo">528</span> private synchronized void updateRegionLoad() {<a name="line.528"></a> +<span class="sourceLineNo">529</span> // We create a new hashmap so that regions that are no longer there are removed.<a name="line.529"></a> +<span class="sourceLineNo">530</span> // However we temporarily need the old loads so we can use them to keep the rolling average.<a name="line.530"></a> +<span class="sourceLineNo">531</span> Map<String, Deque<BalancerRegionLoad>> oldLoads = loads;<a name="line.531"></a> +<span class="sourceLineNo">532</span> loads = new HashMap<>();<a name="line.532"></a> +<span class="sourceLineNo">533</span><a name="line.533"></a> +<span class="sourceLineNo">534</span> clusterStatus.getLiveServerMetrics().forEach((ServerName sn, ServerMetrics sm) -> {<a name="line.534"></a> +<span class="sourceLineNo">535</span> sm.getRegionMetrics().forEach((byte[] regionName, RegionMetrics rm) -> {<a name="line.535"></a> +<span class="sourceLineNo">536</span> Deque<BalancerRegionLoad> rLoads = oldLoads.get(Bytes.toString(regionName));<a name="line.536"></a> +<span class="sourceLineNo">537</span> if (rLoads == null) {<a name="line.537"></a> +<span class="sourceLineNo">538</span> rLoads = new ArrayDeque<>(numRegionLoadsToRemember + 1);<a name="line.538"></a> +<span class="sourceLineNo">539</span> } else if (rLoads.size() >= numRegionLoadsToRemember) {<a name="line.539"></a> +<span class="sourceLineNo">540</span> rLoads.remove();<a name="line.540"></a> +<span class="sourceLineNo">541</span> }<a name="line.541"></a> +<span class="sourceLineNo">542</span> rLoads.add(new BalancerRegionLoad(rm));<a name="line.542"></a> +<span class="sourceLineNo">543</span> loads.put(Bytes.toString(regionName), rLoads);<a name="line.543"></a> +<span class="sourceLineNo">544</span> });<a name="line.544"></a> +<span class="sourceLineNo">545</span> });<a name="line.545"></a> +<span class="sourceLineNo">546</span><a name="line.546"></a> +<span class="sourceLineNo">547</span> for(CostFromRegionLoadFunction cost : regionLoadFunctions) {<a name="line.547"></a> +<span class="sourceLineNo">548</span> cost.setLoads(loads);<a name="line.548"></a> +<span class="sourceLineNo">549</span> }<a name="line.549"></a> +<span class="sourceLineNo">550</span> }<a name="line.550"></a> +<span class="sourceLineNo">551</span><a name="line.551"></a> +<span class="sourceLineNo">552</span> protected void initCosts(Cluster cluster) {<a name="line.552"></a> +<span class="sourceLineNo">553</span> for (CostFunction c:costFunctions) {<a name="line.553"></a> +<span class="sourceLineNo">554</span> c.init(cluster);<a name="line.554"></a> +<span class="sourceLineNo">555</span> }<a name="line.555"></a> +<span class="sourceLineNo">556</span> }<a name="line.556"></a> +<span class="sourceLineNo">557</span><a name="line.557"></a> +<span class="sourceLineNo">558</span> protected void updateCostsWithAction(Cluster cluster, Action action) {<a name="line.558"></a> +<span class="sourceLineNo">559</span> for (CostFunction c : costFunctions) {<a name="line.559"></a> +<span class="sourceLineNo">560</span> c.postAction(action);<a name="line.560"></a> +<span class="sourceLineNo">561</span> }<a name="line.561"></a> +<span class="sourceLineNo">562</span> }<a name="line.562"></a> +<span class="sourceLineNo">563</span><a name="line.563"></a> +<span class="sourceLineNo">564</span> /**<a name="line.564"></a> +<span class="sourceLineNo">565</span> * Get the names of the cost functions<a name="line.565"></a> +<span class="sourceLineNo">566</span> */<a name="line.566"></a> +<span class="sourceLineNo">567</span> public String[] getCostFunctionNames() {<a name="line.567"></a> +<span class="sourceLineNo">568</span> if (costFunctions == null) return null;<a name="line.568"></a> +<span class="sourceLineNo">569</span> String[] ret = new String[costFunctions.length];<a name="line.569"></a> +<span class="sourceLineNo">570</span> for (int i = 0; i < costFunctions.length; i++) {<a name="line.570"></a> +<span class="sourceLineNo">571</span> CostFunction c = costFunctions[i];<a name="line.571"></a> +<span class="sourceLineNo">572</span> ret[i] = c.getClass().getSimpleName();<a name="line.572"></a> +<span class="sourceLineNo">573</span> }<a name="line.573"></a> +<span class="sourceLineNo">574</span><a name="line.574"></a> +<span class="sourceLineNo">575</span> return ret;<a name="line.575"></a> +<span class="sourceLineNo">576</span> }<a name="line.576"></a> +<span class="sourceLineNo">577</span><a name="line.577"></a> +<span class="sourceLineNo">578</span> /**<a name="line.578"></a> +<span class="sourceLineNo">579</span> * This is the main cost function. It will compute a cost associated with a proposed cluster<a name="line.579"></a> +<span class="sourceLineNo">580</span> * state. All different costs will be combined with their multipliers to produce a double cost.<a name="line.580"></a> +<span class="sourceLineNo">581</span> *<a name="line.581"></a> +<span class="sourceLineNo">582</span> * @param cluster The state of the cluster<a name="line.582"></a> +<span class="sourceLineNo">583</span> * @param previousCost the previous cost. This is used as an early out.<a name="line.583"></a> +<span class="sourceLineNo">584</span> * @return a double of a cost associated with the proposed cluster state. This cost is an<a name="line.584"></a> +<span class="sourceLineNo">585</span> * aggregate of all individual cost functions.<a name="line.585"></a> +<span class="sourceLineNo">586</span> */<a name="line.586"></a> +<span class="sourceLineNo">587</span> protected double computeCost(Cluster cluster, double previousCost) {<a name="line.587"></a> +<span class="sourceLineNo">588</span> double total = 0;<a name="line.588"></a> <span class="sourceLineNo">589</span><a name="line.589"></a> -<span class="sourceLineNo">590</span> Float multiplier = c.getMultiplier();<a name="line.590"></a> -<span class="sourceLineNo">591</span> Double cost = c.cost();<a name="line.591"></a> -<span class="sourceLineNo">592</span><a name="line.592"></a> -<span class="sourceLineNo">593</span> this.tempFunctionCosts[i] = multiplier*cost;<a name="line.593"></a> -<span class="sourceLineNo">594</span> total += this.tempFunctionCosts[i];<a name="line.594"></a> -<span class="sourceLineNo">595</span><a name="line.595"></a> -<span class="sourceLineNo">596</span> if (total > previousCost) {<a name="line.596"></a> -<span class="sourceLineNo">597</span> break;<a name="line.597"></a> -<span class="sourceLineNo">598</span> }<a name="line.598"></a> -<span class="sourceLineNo">599</span> }<a name="line.599"></a> +<span class="sourceLineNo">590</span> for (int i = 0; i < costFunctions.length; i++) {<a name="line.590"></a> +<span class="sourceLineNo">591</span> CostFunction c = costFunctions[i];<a name="line.591"></a> +<span class="sourceLineNo">592</span> this.tempFunctionCosts[i] = 0.0;<a name="line.592"></a> +<span class="sourceLineNo">593</span><a name="line.593"></a> +<span class="sourceLineNo">594</span> if (c.getMultiplier() <= 0) {<a name="line.594"></a> +<span class="sourceLineNo">595</span> continue;<a name="line.595"></a> +<span class="sourceLineNo">596</span> }<a name="line.596"></a> +<span class="sourceLineNo">597</span><a name="line.597"></a> +<span class="sourceLineNo">598</span> Float multiplier = c.getMultiplier();<a name="line.598"></a> +<span class="sourceLineNo">599</span> Double cost = c.cost();<a name="line.599"></a> <span class="sourceLineNo">600</span><a name="line.600"></a> -<span class="sourceLineNo">601</span> return total;<a name="line.601"></a> -<span class="sourceLineNo">602</span> }<a name="line.602"></a> +<span class="sourceLineNo">601</span> this.tempFunctionCosts[i] = multiplier*cost;<a name="line.601"></a> +<span class="sourceLineNo">602</span> total += this.tempFunctionCosts[i];<a name="line.602"></a> <span class="sourceLineNo">603</span><a name="line.603"></a> -<span class="sourceLineNo">604</span> /** Generates a candidate action to be applied to the cluster for cost function search */<a name="line.604"></a> -<span class="sourceLineNo">605</span> abstract static class CandidateGenerator {<a name="line.605"></a> -<span class="sourceLineNo">606</span> abstract Cluster.Action generate(Cluster cluster);<a name="line.606"></a> -<span class="sourceLineNo">607</span><a name="line.607"></a> -<span class="sourceLineNo">608</span> /**<a name="line.608"></a> -<span class="sourceLineNo">609</span> * From a list of regions pick a random one. Null can be returned which<a name="line.609"></a> -<span class="sourceLineNo">610</span> * {@link StochasticLoadBalancer#balanceCluster(Map)} recognize as signal to try a region move<a name="line.610"></a> -<span class="sourceLineNo">611</span> * rather than swap.<a name="line.611"></a> -<span class="sourceLineNo">612</span> *<a name="line.612"></a> -<span class="sourceLineNo">613</span> * @param cluster The state of the cluster<a name="line.613"></a> -<span class="sourceLineNo">614</span> * @param server index of the server<a name="line.614"></a> -<span class="sourceLineNo">615</span> * @param chanceOfNoSwap Chance that this will decide to try a move rather<a name="line.615"></a> -<span class="sourceLineNo">616</span> * than a swap.<a name="line.616"></a> -<span class="sourceLineNo">617</span> * @return a random {@link RegionInfo} or null if an asymmetrical move is<a name="line.617"></a> -<span class="sourceLineNo">618</span> * suggested.<a name="line.618"></a> -<span class="sourceLineNo">619</span> */<a name="line.619"></a> -<span class="sourceLineNo">620</span> protected int pickRandomRegion(Cluster cluster, int server, double chanceOfNoSwap) {<a name="line.620"></a> -<span class="sourceLineNo">621</span> // Check to see if this is just a move.<a name="line.621"></a> -<span class="sourceLineNo">622</span> if (cluster.regionsPerServer[server].length == 0 || RANDOM.nextFloat() < chanceOfNoSwap) {<a name="line.622"></a> -<span class="sourceLineNo">623</span> // signal a move only.<a name="line.623"></a> -<span class="sourceLineNo">624</span> return -1;<a name="line.624"></a> -<span class="sourceLineNo">625</span> }<a name="line.625"></a> -<span class="sourceLineNo">626</span> int rand = RANDOM.nextInt(cluster.regionsPerServer[server].length);<a name="line.626"></a> -<span class="sourceLineNo">627</span> return cluster.regionsPerServer[server][rand];<a name="line.627"></a> -<span class="sourceLineNo">628</span><a name="line.628"></a> -<span class="sourceLineNo">629</span> }<a name="line.629"></a> -<span class="sourceLineNo">630</span> protected int pickRandomServer(Cluster cluster) {<a name="line.630"></a> -<span class="sourceLineNo">631</span> if (cluster.numServers < 1) {<a name="line.631"></a> +<span class="sourceLineNo">604</span> if (total > previousCost) {<a name="line.604"></a> +<span class="sourceLineNo">605</span> break;<a name="line.605"></a> +<span class="sourceLineNo">606</span> }<a name="line.606"></a> +<span class="sourceLineNo">607</span> }<a name="line.607"></a> +<span class="sourceLineNo">608</span><a name="line.608"></a> +<span class="sourceLineNo">609</span> return total;<a name="line.609"></a> +<span class="sourceLineNo">610</span> }<a name="line.610"></a> +<span class="sourceLineNo">611</span><a name="line.611"></a> +<span class="sourceLineNo">612</span> /** Generates a candidate action to be applied to the cluster for cost function search */<a name="line.612"></a> +<span class="sourceLineNo">613</span> abstract static class CandidateGenerator {<a name="line.613"></a> +<span class="sourceLineNo">614</span> abstract Cluster.Action generate(Cluster cluster);<a name="line.614"></a> +<span class="sourceLineNo">615</span><a name="line.615"></a> +<span class="sourceLineNo">616</span> /**<a name="line.616"></a> +<span class="sourceLineNo">617</span> * From a list of regions pick a random one. Null can be returned which<a name="line.617"></a> +<span class="sourceLineNo">618</span> * {@link StochasticLoadBalancer#balanceCluster(Map)} recognize as signal to try a region move<a name="line.618"></a> +<span class="sourceLineNo">619</span> * rather than swap.<a name="line.619"></a> +<span class="sourceLineNo">620</span> *<a name="line.620"></a> +<span class="sourceLineNo">621</span> * @param cluster The state of the cluster<a name="line.621"></a> +<span class="sourceLineNo">622</span> * @param server index of the server<a name="line.622"></a> +<span class="sourceLineNo">623</span> * @param chanceOfNoSwap Chance that this will decide to try a move rather<a name="line.623"></a> +<span class="sourceLineNo">624</span> * than a swap.<a name="line.624"></a> +<span class="sourceLineNo">625</span> * @return a random {@link RegionInfo} or null if an asymmetrical move is<a name="line.625"></a> +<span class="sourceLineNo">626</span> * suggested.<a name="line.626"></a> +<span class="sourceLineNo">627</span> */<a name="line.627"></a> +<span class="sourceLineNo">628</span> protected int pickRandomRegion(Cluster cluster, int server, double chanceOfNoSwap) {<a name="line.628"></a> +<span class="sourceLineNo">629</span> // Check to see if this is just a move.<a name="line.629"></a> +<span class="sourceLineNo">630</span> if (cluster.regionsPerServer[server].length == 0 || RANDOM.nextFloat() < chanceOfNoSwap) {<a name="line.630"></a> +<span class="sourceLineNo">631</span> // signal a move only.<a name="line.631"></a> <span class="sourceLineNo">632</span> return -1;<a name="line.632"></a> <span class="sourceLineNo">633</span> }<a name="line.633"></a> -<span class="sourceLineNo">634</span><a name="line.634"></a> -<span class="sourceLineNo">635</span> return RANDOM.nextInt(cluster.numServers);<a name="line.635"></a> -<span class="sourceLineNo">636</span> }<a name="line.636"></a> -<span class="sourceLineNo">637</span><a name="line.637"></a> -<span class="sourceLineNo">638</span> protected int pickRandomRack(Cluster cluster) {<a name="line.638"></a> -<span class="sourceLineNo">639</span> if (cluster.numRacks < 1) {<a name="line.639"></a> +<span class="sourceLineNo">634</span> int rand = RANDOM.nextInt(cluster.regionsPerServer[server].length);<a name="line.634"></a> +<span class="sourceLineNo">635</span> return cluster.regionsPerServer[server][rand];<a name="line.635"></a> +<span class="sourceLineNo">636</span><a name="line.636"></a> +<span class="sourceLineNo">637</span> }<a name="line.637"></a> +<span class="sourceLineNo">638</span> protected int pickRandomServer(Cluster cluster) {<a name="line.638"></a> +<span class="sourceLineNo">639</span> if (cluster.numServers < 1) {<a name="line.639"></a> <span class="sourceLineNo">640</span> return -1;<a name="line.640"></a> <span class="sourceLineNo">641</span> }<a name="line.641"></a> <span class="sourceLineNo">642</span><a name="line.642"></a> -<span class="sourceLineNo">643</span> return RANDOM.nextInt(cluster.numRacks);<a name="line.643"></a> +<span class="sourceLineNo">643</span> return RANDOM.nextInt(cluster.numServers);<a name="line.643"></a> <span class="sourceLineNo">644</span> }<a name="line.644"></a> <span class="sourceLineNo">645</span><a name="line.645"></a> -<span class="sourceLineNo">646</span> protected int pickOtherRandomServer(Cluster cluster, int serverIndex) {<a name="line.646"></a> -<span class="sourceLineNo">647</span> if (cluster.numServers < 2) {<a name="line.647"></a> +<span class="sourceLineNo">646</span> protected int pickRandomRack(Cluster cluster) {<a name="line.646"></a> +<span class="sourceLineNo">647</span> if (cluster.numRacks < 1) {<a name="line.647"></a> <span class="sourceLineNo">648</span> return -1;<a name="line.648"></a> <span class="sourceLineNo">649</span> }<a name="line.649"></a> -<span class="sourceLineNo">650</span> while (true) {<a name="line.650"></a> -<span class="sourceLineNo">651</span> int otherServerIndex = pickRandomServer(cluster);<a name="line.651"></a> -<span class="sourceLineNo">652</span> if (otherServerIndex != serverIndex) {<a name="line.652"></a> -<span class="sourceLineNo">653</span> return otherServerIndex;<a name="line.653"></a> -<span class="sourceLineNo">654</span> }<a name="line.654"></a> -<span class="sourceLineNo">655</span> }<a name="line.655"></a> -<span class="sourceLineNo">656</span> }<a name="line.656"></a> -<span class="sourceLineNo">657</span><a name="line.657"></a> -<span class="sourceLineNo">658</span> protected int pickOtherRandomRack(Cluster cluster, int rackIndex) {<a name="line.658"></a> -<span class="sourceLineNo">659</span> if (cluster.numRacks < 2) {<a name="line.659"></a> -<span class="sourceLineNo">660</span> return -1;<a name="line.660"></a> -<span class="sourceLineNo">661</span> }<a name="line.661"></a> -<span class="sourceLineNo">662</span> while (true) {<a name="line.662"></a> -<span class="sourceLineNo">663</span> int otherRackIndex = pickRandomRack(cluster);<a name="line.663"></a> -<span class="sourceLineNo">664</span> if (otherRackIndex != rackIndex) {<a name="line.664"></a> -<span class="sourceLineNo">665</span> return otherRackIndex;<a name="line.665"></a> -<span class="sourceLineNo">666</span> }<a name="line.666"></a> -<span class="sourceLineNo">667</span> }<a name="line.667"></a> -<span class="sourceLineNo">668</span> }<a name="line.668"></a> -<span class="sourceLineNo">669</span><a name="line.669"></a> -<span class="sourceLineNo">670</span> protected Cluster.Action pickRandomRegions(Cluster cluster,<a name="line.670"></a> -<span class="sourceLineNo">671</span> int thisServer,<a name="line.671"></a> -<span class="sourceLineNo">672</span> int otherServer) {<a name="line.672"></a> -<span class="sourceLineNo">673</span> if (thisServer < 0 || otherServer < 0) {<a name="line.673"></a> -<span class="sourceLineNo">674</span> return Cluster.NullAction;<a name="line.674"></a> +<span class="sourceLineNo">650</span><a name="line.650"></a> +<span class="sourceLineNo">651</span> return RANDOM.nextInt(cluster.numRacks);<a name="line.651"></a> +<span class="sourceLineNo">652</span> }<a name="line.652"></a> +<span class="sourceLineNo">653</span><a name="line.653"></a> +<span class="sourceLineNo">654</span> protected int pickOtherRandomServer(Cluster cluster, int serverIndex) {<a name="line.654"></a> +<span class="sourceLineNo">655</span> if (cluster.numServers < 2) {<a name="line.655"></a> +<span class="sourceLineNo">656</span> return -1;<a name="line.656"></a> +<span class="sourceLineNo">657</span> }<a name="line.657"></a> +<span class="sourceLineNo">658</span> while (true) {<a name="line.658"></a> +<span class="sourceLineNo">659</span> int otherServerIndex = pickRandomServer(cluster);<a name="line.659"></a> +<span class="sourceLineNo">660</span> if (otherServerIndex != serverIndex) {<a name="line.660"></a> +<span class="sourceLineNo">661</span> return otherServerIndex;<a name="line.661"></a> +<span class="sourceLineNo">662</span> }<a name="line.662"></a> +<span class="sourceLineNo">663</span> }<a name="line.663"></a> +<span class="sourceLineNo">664</span> }<a name="line.664"></a> +<span class="sourceLineNo">665</span><a name="line.665"></a> +<span class="sourceLineNo">666</span> protected int pickOtherRandomRack(Cluster cluster, int rackIndex) {<a name="line.666"></a> +<span class="sourceLineNo">667</span> if (cluster.numRacks < 2) {<a name="line.667"></a> +<span class="sourceLineNo">668</span> return -1;<a name="line.668"></a> +<span class="sourceLineNo">669</span> }<a name="line.669"></a> +<span class="sourceLineNo">670</span> while (true) {<a name="line.670"></a> +<span class="sourceLineNo">671</span> int otherRackIndex = pickRandomRack(cluster);<a name="line.671"></a> +<span class="sourceLineNo">672</span> if (otherRackIndex != rackIndex) {<a name="line.672"></a> +<span class="sourceLineNo">673</span> return otherRackIndex;<a name="line.673"></a> +<span class="sourceLineNo">674</span> }<a name="line.674"></a> <span class="sourceLineNo">675</span> }<a name="line.675"></a> -<span class="sourceLineNo">676</span><a name="line.676"></a> -<span class="sourceLineNo">677</span> // Decide who is most likely to need another region<a name="line.677"></a> -<span class="sourceLineNo">678</span> int thisRegionCount = cluster.getNumRegions(thisServer);<a name="line.678"></a> -<span class="sourceLineNo">679</span> int otherRegionCount = cluster.getNumRegions(otherServer);<a name="line.679"></a> -<span class="sourceLineNo">680</span><a name="line.680"></a> -<span class="sourceLineNo">681</span> // Assign the chance based upon the above<a name="line.681"></a> -<span class="sourceLineNo">682</span> double thisChance = (thisRegionCount > otherRegionCount) ? 0 : 0.5;<a name="line.682"></a> -<span class="sourceLineNo">683</span> double otherChance = (thisRegionCount <= otherRegionCount) ? 0 : 0.5;<a name="line.683"></a> +<span class="sourceLineNo">676</span> }<a name="line.676"></a> +<span class="sourceLineNo">677</span><a name="line.677"></a> +<span class="sourceLineNo">678</span> protected Cluster.Action pickRandomRegions(Cluster cluster,<a name="line.678"></a> +<span class="sourceLineNo">679</span> int thisServer,<a name="line.679"></a> +<span class="sourceLineNo">680</span> int otherServer) {<a name="line.680"></a> +<span class="sourceLineNo">681</span> if (thisServer < 0 || otherServer < 0) {<a name="line.681"></a> +<span class="sourceLineNo">682</span> return Cluster.NullAction;<a name="line.682"></a> +<span class="sourceLineNo">683</span> }<a name="line.683"></a> <span class="sourceLineNo">684</span><a name="line.684"></a> -<span class="sourceLineNo">685</span> int thisRegion = pickRandomRegion(cluster, thisServer, thisChance);<a name="line.685"></a> -<span class="sourceLineNo">686</span> int otherRegion = pickRandomRegion(cluster, otherServer, otherChance);<a name="line.686"></a> -<span class="sourceLineNo">687</span><a name="line.687"></a> -<span class="sourceLineNo">688</span> return getAction(thisServer, thisRegion, otherServer, otherRegion);<a name="line.688"></a> -<span class="sourceLineNo">689</span> }<a name="line.689"></a> -<span class="sourceLineNo">690</span><a name="line.690"></a> -<span class="sourceLineNo">691</span> protected Cluster.Action getAction(int fromServer, int fromRegion,<a name="line.691"></a> -<span class="sourceLineNo">692</span> int toServer, int toRegion) {<a name="line.692"></a> -<span class="sourceLineNo">693</span> if (fromServer < 0 || toServer < 0) {<a name="line.693"></a> -<span class="sourceLineNo">694</span> return Cluster.NullAction;<a name="line.694"></a> -<span class="sourceLineNo">695</span> }<a name="line.695"></a> -<span class="sourceLineNo">696</span> if (fromRegion > 0 && toRegion > 0) {<a name="line.696"></a> -<span class="sourceLineNo">697</span> return new Cluster.SwapRegionsAction(fromServer, fromRegion,<a name="line.697"></a> -<span class="sourceLineNo">698</span> toServer, toRegion);<a name="line.698"></a> -<span class="sourceLineNo">699</span> } else if (fromRegion > 0) {<a name="line.699"></a> -<span class="sourceLineNo">700</span> return new Cluster.MoveRegionAction(fromRegion, fromServer, toServer);<a name="line.700"></a> -<span class="sourceLineNo">701</span> } else if (toRegion > 0) {<a name="line.701"></a> -<span class="sourceLineNo">702</span> return new Cluster.MoveRegionAction(toRegion, toServer, fromServer);<a name="line.702"></a> -<span class="sourceLineNo">703</span> } else {<a name="line.703"></a> -<span class="sourceLineNo">704</span> return Cluster.NullAction;<a name="line.704"></a> -<span class="sourceLineNo">705</span> }<a name="line.705"></a> -<span class="sourceLineNo">706</span> }<a name="line.706"></a> -<span class="sourceLineNo">707</span><a name="line.707"></a> -<span class="sourceLineNo">708</span> /**<a name="line.708"></a> -<span class="sourceLineNo">709</span> * Returns a random iteration order of indexes of an array with size length<a name="line.709"></a> -<span class="sourceLineNo">710</span> */<a name="line.710"></a> -<span class="sourceLineNo">711</span> protected List<Integer> getRandomIterationOrder(int length) {<a name="line.711"></a> -<span class="sourceLineNo">712</span> ArrayList<Integer> order = new ArrayList<>(length);<a name="line.712"></a> -<span class="sourceLineNo">713</span> for (int i = 0; i < length; i++) {<a name="line.713"></a> -<span class="sourceLineNo">714</span> order.add(i);<a name="line.714"></a> -<span class="sourceLineNo">715</span> }<a name="line.715"></a> -<span class="sourceLineNo">716</span> Collections.shuffle(order);<a name="line.716"></a> -<span class="sourceLineNo">717</span> return order;<a name="line.717"></a> -<span class="sourceLineNo">718</span> }<a name="line.718"></a> -<span class="sourceLineNo">719</span> }<a name="line.719"></a> -<span class="sourceLineNo">720</span><a name="line.720"></a> -<span class="sourceLineNo">721</span> static class RandomCandidateGenerator extends CandidateGenerator {<a name="line.721"></a> -<span class="sourceLineNo">722</span><a name="line.722"></a> -<span class="sourceLineNo">723</span> @Override<a name="line.723"></a> -<span class="sourceLineNo">724</span> Cluster.Action generate(Cluster cluster) {<a name="line.724"></a> -<span class="sourceLineNo">725</span><a name="line.725"></a> -<span class="sourceLineNo">726</span> int thisServer = pickRandomServer(cluster);<a name="line.726"></a> -<span class="sourceLineNo">727</span><a name="line.727"></a> -<span class="sourceLineNo">728</span> // Pick the other server<a name="line.728"></a> -<span class="sourceLineNo">729</span> int otherServer = pickOtherRandomServer(cluster, thisServer);<a name="line.729"></a> +<span class="sourceLineNo">685</span> // Decide who is most likely to need another region<a name="line.685"></a> +<span class="sourceLineNo">686</span> int thisRegionCount = cluster.getNumRegions(thisServer);<a name="line.686"></a> +<span class="sourceLineNo">687</span> int otherRegionCount = cluster.getNumRegions(otherServer);<a name="line.687"></a> +<span class="sourceLineNo">688</span><a name="line.688"></a> +<span class="sourceLineNo">689</span> // Assign the chance based upon the above<a name="line.689"></a> +<span class="sourceLineNo">690</span> double thisChance = (thisRegionCount > otherRegionCount) ? 0 : 0.5;<a name="line.690"></a> +<span class="sourceLineNo">691</span> double otherChance = (thisRegionCount <= otherRegionCount) ? 0 : 0.5;<a name="line.691"></a> +<span class="sourceLineNo">692</span><a name="line.692"></a> +<span class="sourceLineNo">693</span> int thisRegion = pickRandomRegion(cluster, thisServer, thisChance);<a name="line.693"></a> +<span class="sourceLineNo">694</span> int otherRegion = pickRandomRegion(cluster, otherServer, otherChance);<a name="line.694"></a> +<span class="sourceLineNo">695</span><a name="line.695"></a> +<span class="sourceLineNo">696</span> return getAction(thisServer, thisRegion, otherServer, otherRegion);<a name="line.696"></a> +<span class="sourceLineNo">697</span> }<a name="line.697"></a> +<span class="sourceLineNo">698</span><a name="line.698"></a> +<span class="sourceLineNo">699</span> protected Cluster.Action getAction(int fromServer, int fromRegion,<a name="line.699"></a> +<span class="sourceLineNo">700</span> int toServer, int toRegion) {<a name="line.700"></a> +<span class="sourceLineNo">701</span> if (fromServer < 0 || toServer < 0) {<a name="line.701"></a> +<span class="sourceLineNo">702</span> return Cluster.NullAction;<a name="line.702"></a> +<span class="sourceLineNo">703</span> }<a name="line.703"></a> +<span class="sourceLineNo">704</span> if (fromRegion > 0 && toRegion > 0) {<a name="line.704"></a> +<span class="sourceLineNo">705</span> return new Cluster.SwapRegionsAction(fromServer, fromRegion,<a name="line.705"></a> +<span class="sourceLineNo">706</span> toServer, toRegion);<a name="line.706"></a> +<span class="sourceLineNo">707</span> } else if (fromRegion > 0) {<a name="line.707"></a> +<span class="sourceLineNo">708</span> return new Cluster.MoveRegionAction(fromRegion, fromServer, toServer);<a name="line.708"></a> +<span class="sourceLineNo">709</span> } else if (toRegion > 0) {<a name="line.709"></a> +<span class="sourceLineNo">710</span> return new Cluster.MoveRegionAction(toRegion, toServer, fromServer);<a name="line.710"></a> +<span class="sourceLineNo">711</span> } else {<a name="line.711"></a> +<span class="sourceLineNo">712</span> return Cluster.NullAction;<a name="line.712"></a> +<span class="sourceLineNo">713</span> }<a name="line.713"></a> +<span class="sourceLineNo">714</span> }<a name="line.714"></a> +<span class="sourceLineNo">715</span><a name="line.715"></a> +<span class="sourceLineNo">716</span> /**<a name="line.716"></a> +<span class="sourceLineNo">717</span> * Returns a random iteration order of indexes of an array with size length<a name="line.717"></a> +<span class="sourceLineNo">718</span> */<a name="line.718"></a> +<span class="sourceLineNo">719</span> protected List<Integer> getRandomIterationOrder(int length) {<a name="line.719"></a> +<span class="sourceLineNo">720</span> ArrayList<Integer> order = new ArrayList<>(length);<a name="line.720"></a> +<span class="sourceLineNo">721</span> for (int i = 0; i < length; i++) {<a name="line.721"></a> +<span class="sourceLineNo">722</span> order.add(i);<a name="line.722"></a> +<span class="sourceLineNo">723</span> }<a name="line.723"></a> +<span class="sourceLineNo">724</span> Collections.shuffle(order);<a name="line.724"></a> +<span class="sourceLineNo">725</span> return order;<a name="line.725"></a> +<span class="sourceLineNo">726</span> }<a name="line.726"></a> +<span class="sourceLineNo">727</span> }<a name="line.727"></a> +<span class="sourceLineNo">728</span><a name="line.728"></a> +<span class="sourceLineNo">729</span> static class RandomCandidateGenerator extends CandidateGenerator {<a name="line.729"></a> <span class="sourceLineNo">730</span><a name="line.730"></a> -<span class="sourceLineNo">731</span> return pickRandomRegions(cluster, thisServer, otherServer);<a name="line.731"></a> -<span class="sourceLineNo">732</span> }<a name="line.732"></a> -<span class="sourceLineNo">733</span> }<a name="line.733"></a> -<span class="sourceLineNo">734</span><a name="line.734"></a> -<span class="sourceLineNo">735</span> static class LoadCandidateGenerator extends CandidateGenerator {<a name="line.735"></a> -<span class="sourceLineNo">736</span><a name="line.736"></a> -<span class="sourceLineNo">737</span> @Override<a name="line.737"></a> -<span class="sourceLineNo">738</span> Cluster.Action generate(Cluster cluster) {<a name="line.738"></a> -<span class="sourceLineNo">739</span> cluster.sortServersByRegionCount();<a name="line.739"></a> -<span class="sourceLineNo">740</span> int thisServer = pickMostLoadedServer(cluster, -1);<a name="line.740"></a> -<span class="sourceLineNo">741</span> int otherServer = pickLeastLoadedServer(cluster, thisServer);<a name="line.741"></a> +<span class="sourceLineNo">731</span> @Override<a name="line.731"></a> +<span class="sourceLineNo">732</span> Cluster.Action generate(Cluster cluster) {<a name="line.732"></a> +<span class="sourceLineNo">733</span><a name="line.733"></a> +<span class="sourceLineNo">734</span> int thisServer = pickRandomServer(cluster);<a name="line.734"></a> +<span class="sourceLineNo">735</span><a name="line.735"></a> +<span class="sourceLineNo">736</span> // Pick the other server<a name="line.736"></a> +<span class="sourceLineNo">737</span> int otherServer = pickOtherRandomServer(cluster, thisServer);<a name="line.737"></a> +<span class="sourceLineNo">738</span><a name="line.738"></a> +<span class="sourceLineNo">739</span> return pickRandomRegions(cluster, thisServer, otherServer);<a name="line.739"></a> +<span class="sourceLineNo">740</span> }<a name="line.740"></a> +<span class="sourceLineNo">741</span> }<a name="line.741"></a> <span class="sourceLineNo">742</span><a name="line.742"></a> -<span class="sourceLineNo">743</span> return pickRandomRegions(cluster, thisServer, otherServer);<a name="line.743"></a> -<span class="sourceLineNo">744</span> }<a name="line.744"></a> -<span class="sourceLineNo">745</span><a name="line.745"></a> -<span class="sourceLineNo">746</span> private int pickLeastLoadedServer(final Cluster cluster, int thisServer) {<a name="line.746"></a> -<span class="sourceLineNo">747</span> Integer[] servers = cluster.serverIndicesSortedByRegionCount;<a name="line.747"></a> -<span class="sourceLineNo">748</span><a name="line.748"></a> -<span class="sourceLineNo">749</span> int index = 0;<a name="line.749"></a> -<span class="sourceLineNo">750</span> while (servers[index] == null || servers[index] == thisServer) {<a name="line.750"></a> -<span class="sourceLineNo">751</span> index++;<a name="line.751"></a> -<span class="sourceLineNo">752</span> if (index == servers.length) {<a name="line.752"></a> -<span class="sourceLineNo">753</span> return -1;<a name="line.753"></a> -<span class="sourceLineNo">754</span> }<a name="line.754"></a> -<span class="sourceLineNo">755</span> }<a name="line.755"></a> -<span class="sourceLineNo">756</span> return servers[index];<a name="line.756"></a> -<span class="sourceLineNo">757</span> }<a name="line.757"></a> -<span class="sourceLineNo">758</span><a name="line.758"></a> -<span class="sourceLineNo">759</span> private int pickMostLoadedServer(final Cluster cluster, int thisServer) {<a name="line.759"></a> -<span class="sourceLineNo">760</span> Integer[] servers = cluster.serverIndicesSortedByRegionCount;<a name="line.760"></a> -<span class="sourceLineNo">761</span><a name="line.761"></a> -<span class="sourceLineNo">762</span> int index = servers.length - 1;<a name="line.762"></a> -<span class="sourceLineNo">763</span> while (servers[index] == null || servers[index] == thisServer) {<a name="line.763"></a> -<span class="sourceLineNo">764</span> index--;<a name="line.764"></a> -<span class="sourceLineNo">765</span> if (index < 0) {<a name="line.765"></a> -<span class="sourceLineNo">766</span> return -1;<a name="line.766"></a> -<span class="sourceLineNo">767</span> }<a name="line.767"></a> -<span class="sourceLineNo">768</span> }<a name="line.768"></a> -<span class="sourceLineNo">769</span> return servers[index];<a name="line.769"></a> -<span class="sourceLineNo">770</span> }<a name="line.770"></a> -<span class="sourceLineNo">771</span> }<a name="line.771"></a> -<span class="sourceLineNo">772</span><a name="line.772"></a> -<span class="sourceLineNo">773</span> static class LocalityBasedCandidateGenerator extends CandidateGenerator {<a name="line.773"></a> -<span class="sourceLineNo">774</span><a name="line.774"></a> -<span class="sourceLineNo">775</span> private MasterServices masterServices;<a name="line.775"></a> -<span class="sourceLineNo">776</span><a name="line.776"></a> -<span class="sourceLineNo">777</span> LocalityBasedCandidateGenerator(MasterServices masterServices) {<a name="line.777"></a> -<span class="sourceLineNo">778</span> this.masterServices = masterServices;<a name="line.778"></a> -<span class="sourceLineNo">779</span> }<a name="line.779"></a> +<span class="sourceLineNo">743</span> static class LoadCandidateGenerator extends CandidateGenerator {<a name="line.743"></a> +<span class="sourceLineNo">744</span><a name="line.744"></a> +<span class="sourceLineNo">745</span> @Override<a name="line.745"></a> +<span class="sourceLineNo">746</span> Cluster.Action generate(Cluster cluster) {<a name="line.746"></a> +<span class="sourceLineNo">747</span> cluster.sortServersByRegionCount();<a name="line.747"></a> +<span class="sourceLineNo">748</span> int thisServer = pickMostLoadedServer(cluster, -1);<a name="line.748"></a> +<span class="sourceLineNo">749</span> int otherServer = pickLeastLoadedServer(cluster, thisServer);<a name="line.749"></a> +<span class="sourceLineNo">750</span><a name="line.750"></a> +<span class="sourceLineNo">751</span> return pickRandomRegions(cluster, thisServer, otherServer);<a name="line.751"></a> +<span class="sourceLineNo">752</span> }<a name="line.752"></a> +<span class="sourceLineNo">753</span><a name="line.753"></a> +<span class="sourceLineNo">754</span> private int pickLeastLoadedServer(final Cluster cluster, int thisServer) {<a name="line.754"></a> +<span class="sourceLineNo">755</span> Integer[] servers = cluster.serverIndicesSortedByRegionCount;<a name="line.755"></a> +<span class="sourceLineNo">756</span><a name="line.756"></a> +<span class="sourceLineNo">757</span> int index = 0;<a name="line.757"></a> +<span class="sourceLineNo">758</span> while (servers[index] == null || servers[index] == thisServer) {<a name="line.758"></a> +<span class="sourceLineNo">759</span> index++;<a name="line.759"></a> +<span class="sourceLineNo">760</span> if (index == servers.length) {<a name="line.760"></a> +<span class="sourceLineNo">761</span> return -1;<a name="line.761"></a> +<span class="sourceLineNo">762</span> }<a name="line.762"></a> +<span class="sourceLineNo">763</span> }<a name="line.763"></a> +<span class="sourceLineNo">764</span> return servers[index];<a name="line.764"></a> +<span class="sourceLineNo">765</span> }<a name="line.765"></a> +<span class="sourceLineNo">766</span><a name="line.766"></a> +<span class="sourceLineNo">767</span> private int pickMostLoadedServer(final Cluster cluster, int thisServer) {<a name="line.767"></a> +<span class="sourceLineNo">768</span> Integer[] servers = cluster.serverIndicesSortedByRegionCount;<a name="line.768"></a> +<span class="sourceLineNo">769</span><a name="line.769"></a> +<span class="sourceLineNo">770</span> int index = servers.length - 1;<a name="line.770"></a> +<span class="sourceLineNo">771</span> while (servers[index] == null || servers[index] == thisServer) {<a name="line.771"></a> +<span class="sourceLineNo">772</span> index--;<a name="line.772"></a> +<span class="sourceLineNo">773</span> if (index < 0) {<a name="line.773"></a> +<span class="sourceLineNo">774</span> return -1;<a name="line.774"></a> +<span class="sourceLineNo">775</span> }<a name="line.775"></a> +<span class="sourceLineNo">776</span> }<a name="line.776"></a> +<span class="sourceLineNo">777</span> return servers[index];<a name="line.777"></a> +<span class="sourceLineNo">778</span> }<a name="line.778"></a> +<span class="sourceLineNo">779</span> }<a name="line.779"></a> <span class="sourceLineNo">780</span><a name="line.780"></a> -<span class="sourceLineNo">781</span> @Override<a name="line.781"></a> -<span class="sourceLineNo">782</span> Cluster.Action generate(Cluster cluster) {<a name="line.782"></a> -<span class="sourceLineNo">783</span> if (this.masterServices == null) {<a name="line.783"></a> -<span class="sourceLineNo">784</span> int thisServer = pickRandomServer(cluster);<a name="line.784"></a> -<span class="sourceLineNo">785</span> // Pick the other server<a name="line.785"></a> -<span class="sourceLineNo">786</span> int otherServer = pickOtherRandomServer(cluster, thisServer);<a name="line.786"></a> -<span class="sourceLineNo">787</span> return pickRandomRegions(cluster, thisServer, otherServer);<a name="line.787"></a> -<span class="sourceLineNo">788</span> }<a name="line.788"></a> -<span class="sourceLineNo">789</span><a name="line.789"></a> -<span class="sourceLineNo">790</span> // Randomly iterate through regions until you find one that is not on ideal host<a name="line.790"></a> -<span class="sourceLineNo">791</span> for (int region : getRandomIterationOrder(cluster.numRegions)) {<a name="line.791"></a> -<span class="sourceLineNo">792</span> int currentServer = cluster.regionIndexToServerIndex[region];<a name="line.792"></a> -<span class="sourceLineNo">793</span> if (currentServer != cluster.getOrComputeRegionsToMostLocalEntities(LocalityType.SERVER)[region]) {<a name="line.793"></a> -<span class="sourceLineNo">794</span> Optional<Action> potential = tryMoveOrSwap(<a name="line.794"></a> -<span class="sourceLineNo">795</span> cluster,<a name="line.795"></a> -<span class="sourceLineNo">796</span> currentServer,<a name="line.796"></a> -<span class="sourceLineNo">797</span> region,<a name="line.797"></a> -<span class="sourceLineNo">798</span> cluster.getOrComputeRegionsToMostLocalEntities(LocalityType.SERVER)[region]<a name="line.798"></a> -<span class="sourceLineNo">799</span> );<a name="line.799"></a> -<span class="sourceLineNo">800</span> if (potential.isPresent()) {<a name="line.800"></a> -<span class="sourceLineNo">801</span> return potential.get();<a name="line.801"></a> -<span class="sourceLineNo">802</span> }<a name="line.802"></a> -<span class="sourceLineNo">803</span> }<a name="line.803"></a> -<span class="sourceLineNo">804</span> }<a name="line.804"></a> -<span class="sourceLineNo">805</span> return Cluster.NullAction;<a name="line.805"></a> -<span class="sourceLineNo">806</span> }<a name="line.806"></a> -<span class="sourceLineNo">807</span><a name="line.807"></a> -<span class="sourceLineNo">808</span> /**<a name="line.808"></a> -<span class="sourceLineNo">809</span> * Try to generate a move/swap fromRegion between fromServer and toServer such that locality is improved.<a name="line.809"></a> -<span class="sourceLineNo">810</span> * Returns empty optional if no move can be found<a name="line.810"></a> -<span class="sourceLineNo">811</span> */<a name="line.811"></a> -<span class="sourceLineNo">812</span> private Optional<Action> tryMoveOrSwap(Cluster cluster,<a name="line.812"></a> -<span class="sourceLineNo">813</span> int fromServer,<a name="line.813"></a> -<span class="sourceLineNo">814</span> int fromRegion,<a name="line.814"></a> -<span class="sourceLineNo">815</span> int toServer) {<a name="line.815"></a> -<span class="sourceLineNo">816</span> // Try move first. We know apriori fromRegion has the highest locality on toServer<a name="line.816"></a> -<span class="sourceLineNo">817</span> if (cluster.serverHasTooFewRegions(toServer)) {<a name="line.817"></a> -<span class="sourceLineNo">818</span> return Optional.of(getAction(fromServer, fromRegion, toServer, -1));<a name="line.818"></a> -<span class="sourceLineNo">819</span> }<a name="line.819"></a> -<span class="sourceLineNo">820</span><a name="line.820"></a> -<span class="sourceLineNo">821</span> // Compare locality gain/loss from swapping fromRegion with regions on toServer<a name="line.821"></a> -<span class="sourceLineNo">822</span> double fromRegionLocalityDelta =<a name="line.822"></a> -<span class="sourceLineNo">823</span> getWeightedLocality(cluster, fromRegion, toServer) - getWeightedLocality(cluster, fromRegion, fromServer);<a name="line.823"></a> -<span class="sourceLineNo">824</span> for (int toRegionIndex : getRandomIterationOrder(cluster.regionsPerServer[toServer].length)) {<a name="line.824"></a> -<span class="sourceLineNo">825</span> int toRegion = cluster.regionsPerServer[toServer][toRegionIndex];<a name="line.825"></a> -<span class="sourceLineNo">826</span> double toRegionLocalityDelta =<a name="line.826"></a> -<span class="sourceLineNo">827</span> getWeightedLocality(cluster, toRegion, fromServer) - getWeightedLocality(cluster, toRegion, toServer);<a name="line.827"></a> -<span class="sourceLineNo">828</span> // If locality would remain neutral or improve, attempt the swap<a name="line.828"></a> -<span class="sourceLineNo">829</span> if (fromRegionLocalityDelta + toRegionLocalityDelta >= 0) {<a name="line.829"></a> -<span class="sourceLineNo">830</span> return Optional.of(getAction(fromServer, fromRegion, toServer, toRegion));<a name="line.830"></a> -<span class="sourceLineNo">831</span> }<a name="line.831"></a> -<span class="sourceLineNo">832</span> }<a name="line.832"></a> -<span class="sourceLineNo">833</span><a name="line.833"></a> -<span class="sourceLineNo">834</span> return Optional.absent();<a name="line.834"></a> -<span class="sourceLineNo">835</span> }<a name="line.835"></a> -<span class="sourceLineNo">836</span><a name="line.836"></a> -<span class="sourceLineNo">837</span> private double getWeightedLocality(Cluster cluster, int region, int server) {<a name="line.837"></a> -<span class="sourceLineNo">838</span> return cluster.getOrComputeWeightedLocality(region, server, LocalityType.SERVER);<a name="line.838"></a> -<span class="sourceLineNo">839</span> }<a name="line.839"></a> -<span class="sourceLineNo">840</span><a name="line.840"></a> -<span class="sourceLineNo">841</span> void setServices(MasterServices services) {<a name="line.841"></a> -<span class="sourceLineNo">842</span> this.masterServices = services;<a name="line.842"></a> +<span class="sourceLineNo">781</span> static class LocalityBasedCandidateGenerator extends CandidateGenerator {<a name="line.781"></a> +<span class="sourceLineNo">782</span><a name="line.782"></a> +<span class="sourceLineNo">783</span> private MasterServices masterServices;<a name="line.783"></a> +<span class="sourceLineNo">784</span><a name="line.784"></a> +<span class="sourceLineNo">785</span> LocalityBasedCandidateGenerator(MasterServices masterServices) {<a name="line.785"></a> +<span class="sourceLineNo">786</span> this.masterServices = masterServices;<a name="line.786"></a> +<span class="sourceLineNo">787</span> }<a name="line.787"></a> +<span class="sourceLineNo">788</span><a name="line.788"></a> +<span class="sourceLineNo">789</span> @Override<a name="line.789"></a> +<span class="sourceLineNo">790</span> Cluster.Action generate(Cluster cluster) {<a name="line.790"></a> +<span class="sourceLineNo">791</span> if (this.masterServices == null) {<a name="line.791"></a> +<span class="sourceLineNo">792</span> int thisServer = pickRandomServer(cluster);<a name="line.792"></a> +<span class="sourceLineNo">793</span> // Pick the other server<a name="line.793"></a> +<span class="sourceLineNo">794</span> int otherServer = pickOtherRandomServer(cluster, thisServer);<a name="line.794"></a> +<span class="sourceLineNo">795</span> return pickRandomRegions(cluster, thisServer, otherServer);<a name="line.795"></a> +<span class="sourceLineNo">796</span> }<a name="line.796"></a> +<span class="sourceLineNo">797</span><a name="line.797"></a> +<span class="sourceLineNo">798</span> // Randomly iterate through regions until you find one that is not on ideal host<a name="line.798"></a> +<span class="sourceLineNo">799</span> for (int region : getRandomIterationOrder(cluster.numRegions)) {<a name="line.799"></a> +<span class="sourceLineNo">800</span> int currentServer = cluster.regionIndexToServerIndex[region];<a name="line.800"></a> +<span class="sourceLineNo">801</span> if (currentServer != cluster.getOrComputeRegionsToMostLocalEntities(LocalityType.SERVER)[region]) {<a name="line.801"></a> +<span class="sourceLineNo">802</span> Optional<Action> potential = tryMoveOrSwap(<a name="line.802"></a> +<span class="sourceLineNo">803</span> cluster,<a name="line.803"></a> +<span class="sourceLineNo">804</span> currentServer,<a name="line.804"></a> +<span class="sourceLineNo">805</span> region,<a name="line.805"></a> +<span class="sourceLineNo">806</span> cluster.getOrComputeRegionsToMostLocalEntities(LocalityType.SERVER)[region]<a name="line.806"></a> +<span class="sourceLineNo">807</span> );<a name="line.807"></a> +<span class="sourceLineNo">808</span> if (potential.isPresent()) {<a name="line.808"></a> +<span class="sourceLineNo">809</span> return potential.get();<a name="line.809"></a> +<span class="sourceLineNo">810</span> }<a name="line.810"></a> +<span class="sourceLineNo">811</span> }<a name="line.811"></a> +<span class="sourceLineNo">812</span> }<a name="line.812"></a> +<span class="sourceLineNo">813</span> return Cluster.NullAction;<a name="line.813"></a> +<span class="sourceLineNo">814</span> }<a name="line.814"></a> +<span class="sourceLineNo">815</span><a name="line.815"></a> +<span class="sourceLineNo">816</span> /**<a name="line.816"></a> +<span class="sourceLineNo">817</span> * Try to generate a move/swap fromRegion between fromServer and toServer such that locality is improved.<a name="line.817"></a> +<span class="sourceLineNo">818</span> * Returns empty optional if no move can be found<a name="line.818"></a> +<span class="sourceLineNo">819</span> */<a name="line.819"></a> +<span class="sourceLineNo">820</span> private Optional<Action> tryMoveOrSwap(Cluster cluster,<a name="line.820"></a> +<span class="sourceLineNo">821</span> int fromServer,<a name="line.821"></a> +<span class="sourceLineNo">822</span> int fromRegion,<a name="line.822"></a> +<span class="sourceLineNo">823</span> int toServer) {<a name="line.823"></a> +<span class="sourceLineNo">824</span> // Try move first. We know apriori fromRegion has the highest locality on toServer<a name="line.824"></a> +<span class="sourceLineNo">825</span> if (cluster.serverHasTooFewRegions(toServer)) {<a name="line.825"></a> +<span class="sourceLineNo">826</span> return Optional.of(getAction(fromServer, fromRegion, toServer, -1));<a name="line.826"></a> +<span class="sourceLineNo">827</span> }<a name="line.827"></a> +<span class="sourceLineNo">828</span><a name="line.828"></a> +<span class="sourceLineNo">829</span> // Compare locality gain/loss from swapping fromRegion with regions on toServer<a name="line.829"></a> +<span class="sourceLineNo">830</span> double fromRegionLocalityDelta =<a name="line.830"></a> +<span class="sourceLineNo">831</span> getWeightedLocality(cluster, fromRegion, toServer) - getWeightedLocality(cluster, fromRegion, fromServer);<a name="line.831"></a> +<span class="sourceLineNo">832</span> for (int toRegionIndex : getRandomIterationOrder(cluster.regionsPerServer[toServer].length)) {<a name="line.832"></a> +<span class="sourceLineNo">833</span> int toRegion = cluster.regionsPerServer[toServer][toRegionIndex];<a name="line.833"></a> +<span class="sourceLineNo">834</span> double toRegionLocalityDelta =<a name="line.834"></a> +<span class="sourceLineNo">
<TRUNCATED>
