[GitHub] [hbase] virajjasani commented on a change in pull request #2044: HBASE-24709 Support MoveCostFunction use a lower multiplier in offpea…

[GitBox]

virajjasani commented on a change in pull request #2044:
URL: https://github.com/apache/hbase/pull/2044#discussion_r456767882



##########
File path: 
hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java
##########
@@ -827,26 +828,34 @@ protected double scale(double min, double max, double 
value) {
    */
   static class MoveCostFunction extends CostFunction {
     private static final String MOVE_COST_KEY = 
"hbase.master.balancer.stochastic.moveCost";
+    private static final String MOVE_COST_OFFPEAK_KEY = 
"hbase.master.balancer.stochastic.moveCost.offpeak";
     private static final String MAX_MOVES_PERCENT_KEY =
         "hbase.master.balancer.stochastic.maxMovePercent";
-    private static final float DEFAULT_MOVE_COST = 7;
+    @VisibleForTesting
+    protected static final float DEFAULT_MOVE_COST = 7;
+    protected static final float DEFAULT_MOVE_COST_OFFPEAK = 3;
     private static final int DEFAULT_MAX_MOVES = 600;
     private static final float DEFAULT_MAX_MOVE_PERCENT = 0.25f;
 
     private final float maxMovesPercent;
+    private final Configuration conf;
 
     MoveCostFunction(Configuration conf) {
       super(conf);
-
-      // Move cost multiplier should be the same cost or higher than the rest 
of the costs to ensure
-      // that large benefits are need to overcome the cost of a move.
-      this.setMultiplier(conf.getFloat(MOVE_COST_KEY, DEFAULT_MOVE_COST));
+      this.conf = conf;
       // What percent of the number of regions a single run of the balancer 
can move.
       maxMovesPercent = conf.getFloat(MAX_MOVES_PERCENT_KEY, 
DEFAULT_MAX_MOVE_PERCENT);
     }
 
     @Override
     protected double cost() {
+      // Move cost multiplier should be the same cost or higher than the rest 
of the costs to ensure
+      // that large benefits are need to overcome the cost of a move.
+      if (OffPeakHours.getInstance(conf).isOffPeakHour()) {
+        this.setMultiplier(conf.getFloat(MOVE_COST_OFFPEAK_KEY, 
DEFAULT_MOVE_COST_OFFPEAK));
+      } else {
+        this.setMultiplier(conf.getFloat(MOVE_COST_KEY, DEFAULT_MOVE_COST));
+      }

Review comment:
       Yeah, this makes sense. +1




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