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HBASE-21338 Warn if balancer is an ill-fit for cluster size 

Signed-off-by: Michael Stack <stack@apache.org>
This commit is contained in:
xcang 2018-10-22 16:29:08 -07:00 committed by Michael Stack
parent e29ce9f937
commit 3979aebebf
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1 changed files with 13 additions and 5 deletions
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18
hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java
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@ -372,9 +372,6 @@ public class StochasticLoadBalancer extends BaseLoadBalancer {
for (int i = 0; i < this.curFunctionCosts.length; i++) {
curFunctionCosts[i] = tempFunctionCosts[i];
}
LOG.info("start StochasticLoadBalancer.balancer, initCost=" + currentCost + ", functionCost="
+ functionCost());
double initCost = currentCost;
double newCost = currentCost;
@ -383,9 +380,20 @@ public class StochasticLoadBalancer extends BaseLoadBalancer {
computedMaxSteps = Math.max(this.maxSteps,
((long)cluster.numRegions * (long)this.stepsPerRegion * (long)cluster.numServers));
} else {
computedMaxSteps = Math.min(this.maxSteps,
((long)cluster.numRegions * (long)this.stepsPerRegion * (long)cluster.numServers));
long calculatedMaxSteps = (long)cluster.numRegions * (long)this.stepsPerRegion *
(long)cluster.numServers;
computedMaxSteps = Math.min(this.maxSteps, calculatedMaxSteps);
if (calculatedMaxSteps > maxSteps) {
LOG.warn("calculatedMaxSteps:{} for loadbalancer's stochastic walk is larger than "
+ "maxSteps:{}. Hence load balancing may not work well. Setting parameter "
+ "\"hbase.master.balancer.stochastic.runMaxSteps\" to true can overcome this issue."
+ "(This config change does not require service restart)", calculatedMaxSteps,
maxRunningTime);
}
}
LOG.info("start StochasticLoadBalancer.balancer, initCost=" + currentCost + ", functionCost="
+ functionCost() + " computedMaxSteps: " + computedMaxSteps);
// Perform a stochastic walk to see if we can get a good fit.
long step;