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HBASE-26308 Sum of multiplier of cost functions is not populated properly when we have a shortcut for trigger (#3710) 

Signed-off-by: Duo Zhang <zhangduo@apache.org>
Signed-off-by: Huaxiang Sun <huaxiangsun@apache.org>
This commit is contained in:
clarax 2021-10-21 11:19:21 -07:00 committed by GitHub
parent 69656e0df8
commit 0d4982404c
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 28 additions and 21 deletions
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49
hbase-balancer/src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java
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@ -132,7 +132,7 @@ public class StochasticLoadBalancer extends BaseLoadBalancer {
private List<CandidateGenerator> candidateGenerators;
private List<CostFunction> costFunctions; // FindBugs: Wants this protected; IS2_INCONSISTENT_SYNC
// To save currently configed sum of multiplier. Defaulted at 1 for cases that carry high cost
private float sumMultiplier = 1.0f;
private float sumMultiplier;
// to save and report costs to JMX
private double curOverallCost = 0d;
private double[] tempFunctionCosts;
@ -248,11 +248,12 @@ public class StochasticLoadBalancer extends BaseLoadBalancer {
curFunctionCosts = new double[costFunctions.size()];
tempFunctionCosts = new double[costFunctions.size()];
LOG.info("Loaded config; maxSteps=" + maxSteps + ", runMaxSteps=" + runMaxSteps,
", stepsPerRegion=" + stepsPerRegion +
", maxRunningTime=" + maxRunningTime + ", isByTable=" + isByTable + ", CostFunctions=" +
Arrays.toString(getCostFunctionNames()) + " etc.");
}
LOG.info(
"Loaded config; maxSteps=" + maxSteps + ", runMaxSteps=" + runMaxSteps +
", stepsPerRegion=" + stepsPerRegion +
", maxRunningTime=" + maxRunningTime + ", isByTable=" + isByTable +
", CostFunctions=" + Arrays.toString(getCostFunctionNames()) +
" , sum of multiplier of cost functions = " + sumMultiplier + " etc."); }
@Override
public void updateClusterMetrics(ClusterMetrics st) {
@ -345,33 +346,27 @@ public class StochasticLoadBalancer extends BaseLoadBalancer {
return false;
}
if (areSomeRegionReplicasColocated(cluster)) {
LOG.info("Running balancer because at least one server hosts replicas of the same region.");
LOG.info("Running balancer because at least one server hosts replicas of the same region." +
" function cost={}", functionCost());
return true;
}
if (idleRegionServerExist(cluster)){
LOG.info("Running balancer because cluster has idle server(s).");
LOG.info("Running balancer because at least one server hosts replicas of the same region." +
"regionReplicaRackCostFunction={}", regionReplicaRackCostFunction.cost());
LOG.info("Running balancer because cluster has idle server(s)."+
" function cost={}", functionCost());
return true;
}
sumMultiplier = 0.0f;
double total = 0.0;
for (CostFunction c : costFunctions) {
float multiplier = c.getMultiplier();
double cost = c.cost();
if (!c.isNeeded()) {
LOG.trace("{} not needed", c.getClass().getSimpleName());
continue;
}
total += cost * multiplier;
sumMultiplier += multiplier;
total += c.cost() * c.getMultiplier();
}
if (sumMultiplier <= 0) {
LOG.error("At least one cost function needs a multiplier > 0. For example, set "
+ "hbase.master.balancer.stochastic.regionCountCost to a positive value or default");
return false;
}
boolean balanced = (total / sumMultiplier < minCostNeedBalance);
if (balanced) {
@ -435,6 +430,18 @@ public class StochasticLoadBalancer extends BaseLoadBalancer {
initCosts(cluster);
sumMultiplier = 0;
for (CostFunction c : costFunctions) {
if(c.isNeeded()) {
sumMultiplier += c.getMultiplier();
}
}
if (sumMultiplier <= 0) {
LOG.error("At least one cost function needs a multiplier > 0. For example, set "
+ "hbase.master.balancer.stochastic.regionCountCost to a positive value or default");
return null;
}
double currentCost = computeCost(cluster, Double.MAX_VALUE);
curOverallCost = currentCost;
System.arraycopy(tempFunctionCosts, 0, curFunctionCosts, 0, curFunctionCosts.length);
@ -598,8 +605,8 @@ public class StochasticLoadBalancer extends BaseLoadBalancer {
builder.append(", ");
double cost = c.cost();
builder.append("imbalance=" + cost);
if (cost < minCostNeedBalance) {
builder.append(", balanced");
if (cost >= minCostNeedBalance) {
builder.append(", need balance");
}
} else {
builder.append("not needed");