jiajunwang commented on a change in pull request #490: Add latency metric
components for WAGED rebalancer
URL: https://github.com/apache/helix/pull/490#discussion_r329770758
##########
File path:
helix-core/src/main/java/org/apache/helix/controller/rebalancer/waged/WagedRebalancer.java
##########
@@ -90,31 +92,39 @@ private static AssignmentMetadataStore
constructAssignmentStore(HelixManager hel
}
public WagedRebalancer(HelixManager helixManager,
- Map<ClusterConfig.GlobalRebalancePreferenceKey, Integer> preferences) {
+ Map<ClusterConfig.GlobalRebalancePreferenceKey, Integer> preferences,
+ MetricCollector metricCollector) throws JMException {
this(constructAssignmentStore(helixManager),
ConstraintBasedAlgorithmFactory.getInstance(preferences),
// Use DelayedAutoRebalancer as the mapping calculator for the final
assignment output.
// Mapping calculator will translate the best possible assignment into
the applicable state
// mapping based on the current states.
// TODO abstract and separate the main mapping calculator logic from
DelayedAutoRebalancer
- new DelayedAutoRebalancer());
+ new DelayedAutoRebalancer(), metricCollector);
}
private WagedRebalancer(AssignmentMetadataStore assignmentMetadataStore,
- RebalanceAlgorithm algorithm, MappingCalculator mappingCalculator) {
+ RebalanceAlgorithm algorithm, MappingCalculator mappingCalculator,
+ MetricCollector metricCollector) throws JMException {
if (assignmentMetadataStore == null) {
LOG.warn("Assignment Metadata Store is not configured properly."
+ " The rebalancer will not access the assignment store during the
rebalance.");
}
_assignmentMetadataStore = assignmentMetadataStore;
_rebalanceAlgorithm = algorithm;
_mappingCalculator = mappingCalculator;
+ _metricCollector = metricCollector;
Review comment:
For aligning with the other metric providers (or collectors), shall we allow
null object here? Basically null means we skip the metrics emitting.
Due to the metric count limitation, probably we don't want any MBean to be
registered during the unrelated tests.
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