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https://issues.apache.org/jira/browse/HBASE-20936?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Xu Cang updated HBASE-20936:
----------------------------
Comment: was deleted
(was:
[https://github.com/apache/hbase/blob/067388bfd9dccdb42fcbeedc45a3862555603892/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/StochasticLoadBalancer.java#L417]
The undoAction is not implemented.
[https://github.com/apache/hbase/blob/067388bfd9dccdb42fcbeedc45a3862555603892/hbase-server/src/main/java/org/apache/hadoop/hbase/master/balancer/BaseLoadBalancer.java#L643]
So "regionsPerServer" can be changed if StochasticLoadBalancer tried some
actions before which modified the regionsPerServer.
!/jira/secure/viewavatar?size=xsmall&avatarId=21133&avatarType=issuetype|width=16,height=16!
HBASE-19263 is also caused by StochasticLoadBalancer.
So my fix is to check if the region is still on the server or not to avoid NPE.
)
> BaseLoadBalancer throws ArrayIndexOutOfBoundsException
> ------------------------------------------------------
>
> Key: HBASE-20936
> URL: https://issues.apache.org/jira/browse/HBASE-20936
> Project: HBase
> Issue Type: Bug
> Components: Balancer
> Affects Versions: 2.0.1
> Reporter: stack
> Priority: Major
> Attachments: HBASE-20936.master.001.patch
>
>
> I see the below in a test cluster. The balancer code has been in place a long
> time. Not sure why its doing the below. Will look later. Meantime, making a
> record of it.
> {code}
> 2018-07-24 22:03:43,261 INFO [master/ve0524:16000.Chore.1]
> balancer.StochasticLoadBalancer: start StochasticLoadBalancer.balancer,
> initCost=280.47655219381977, functionCost=RegionCountSkewCostFunction :
> (500.0, 0.4992354740061162); PrimaryRegionCountSkewCostFunction : (500.0,
> 0.0); MoveCostFunction : (7.0, 0.0); ServerLocalityCostFunction : (25.0,
> 0.5961002123692674); RackLocalityCostFunction : (15.0, 0.0);
> TableSkewCostFunction : (35.0, 0.3660578386605784);
> RegionReplicaHostCostFunction : (100000.0, 0.0);
> RegionReplicaRackCostFunction : (10000.0, 0.0); ReadRequestCostFunction :
> (5.0, 0.0); WriteRequestCostFunction : (5.0, 0.0); MemStoreSizeCostFunction :
> (5.0, 0.0); StoreFileCostFunction : (5.0, 0.6288571056819432);
> 2018-07-24 22:03:43,322 ERROR [master/ve0524:16000.Chore.1]
> hbase.ScheduledChore: Caught error
> java.lang.ArrayIndexOutOfBoundsException: 64
> at
> org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer$Cluster.removeRegion(BaseLoadBalancer.java:872)
> at
> org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer$Cluster.regionMoved(BaseLoadBalancer.java:827)
> at
> org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer$Cluster.doAction(BaseLoadBalancer.java:723)
> at
> org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.balanceCluster(StochasticLoadBalancer.java:399)
> at
> org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.balanceCluster(StochasticLoadBalancer.java:318)
> at org.apache.hadoop.hbase.master.HMaster.balance(HMaster.java:1514)
> at org.apache.hadoop.hbase.master.HMaster.balance(HMaster.java:1445)
> at
> org.apache.hadoop.hbase.master.balancer.BalancerChore.chore(BalancerChore.java:49)
> at org.apache.hadoop.hbase.ScheduledChore.run(ScheduledChore.java:186)
> at
> java.util.concurrent.Executors$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$JitteredRunnableScheduledFuture.run(JitterScheduledThreadPoolExecutorImpl.java:111)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> 2018-07-24 22:08:20,101 INFO [LruBlockCacheStatsExecutor]
> hfile.LruBlockCache: totalSize=4.61 MB, freeSize=6.14 GB, max=6.14 GB,
> blockCount=0, accesses=0, hits=0, hitRatio=0, cachingAccesses=0,
> cachingHits=0, cachingHitsRatio=0,evictions=119, evicted=0, evictedPerRun=0.0
> 2018-07-24 22:08:38,101 INFO [master/ve0524:16000.Chore.1]
> balancer.StochasticLoadBalancer: start StochasticLoadBalancer.balancer,
> initCost=280.4765419610035, functionCost=RegionCountSkewCostFunction :
> (500.0, 0.4992354740061162); PrimaryRegionCountSkewCostFunction : (500.0,
> 0.0); MoveCostFunction : (7.0, 0.0); ServerLocalityCostFunction : (25.0,
> 0.5961002123692674); RackLocalityCostFunction : (15.0, 0.0);
> TableSkewCostFunction : (35.0, 0.3660578386605784);
> RegionReplicaHostCostFunction : (100000.0, 0.0);
> RegionReplicaRackCostFunction : (10000.0, 0.0); ReadRequestCostFunction :
> (5.0, 0.0); WriteRequestCostFunction : (5.0, 0.0); MemStoreSizeCostFunction :
> (5.0, 0.0); StoreFileCostFunction : (5.0, 0.6288550591186913);
> 2018-07-24 22:08:38,103 ERROR [master/ve0524:16000.Chore.1]
> hbase.ScheduledChore: Caught error
> java.lang.ArrayIndexOutOfBoundsException: 100
> at
> org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer$Cluster.removeRegion(BaseLoadBalancer.java:872)
> at
> org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer$Cluster.regionMoved(BaseLoadBalancer.java:827)
> at
> org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer$Cluster.doAction(BaseLoadBalancer.java:723)
> at
> org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.balanceCluster(StochasticLoadBalancer.java:399)
> at
> org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.balanceCluster(StochasticLoadBalancer.java:318)
> at org.apache.hadoop.hbase.master.HMaster.balance(HMaster.java:1514)
> at org.apache.hadoop.hbase.master.HMaster.balance(HMaster.java:1445)
> at
> org.apache.hadoop.hbase.master.balancer.BalancerChore.chore(BalancerChore.java:49)
> at org.apache.hadoop.hbase.ScheduledChore.run(ScheduledChore.java:186)
> at
> java.util.concurrent.Executors$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$JitteredRunnableScheduledFuture.run(JitterScheduledThreadPoolExecutorImpl.java:111)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {code}
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