casuallc opened a new pull request #410: check regionIndex URL: https://github.com/apache/hbase/pull/410 if regionIndex not in regions, there will be ArrayIndexOutOfBoundsException. such as 2019-07-25 15:19:59,828 ERROR [master/nna:16000.Chore.1] hbase.ScheduledChore: Caught error java.lang.ArrayIndexOutOfBoundsException: 3171 at org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer$Cluster.removeRegion(BaseLoadBalancer.java:873) at org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer$Cluster.doAction(BaseLoadBalancer.java:716) at org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.balanceCluster(StochasticLoadBalancer.java:407) at org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.balanceCluster(StochasticLoadBalancer.java:318) at org.apache.hadoop.hbase.master.HMaster.balance(HMaster.java:1650) at org.apache.hadoop.hbase.master.HMaster.balance(HMaster.java:1567) at org.apache.hadoop.hbase.master.balancer.BalancerChore.chore(BalancerChore.java:49) at org.apache.hadoop.hbase.ScheduledChore.run(ScheduledChore.java:186) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) at org.apache.hadoop.hbase.JitterScheduledThreadPoolExecutorImpl$JitteredRunnableScheduledFuture.run(JitterScheduledThreadPoolExecutorImpl.java:111) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)
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