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https://issues.apache.org/jira/browse/HBASE-16810?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Pope updated HBASE-16810:
-------------------------------
    Status: Patch Available  (was: In Progress)

> HBase Balancer throws ArrayIndexOutOfBoundsException when regionservers in 
> /hbase/draining znode and unloaded
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-16810
>                 URL: https://issues.apache.org/jira/browse/HBASE-16810
>             Project: HBase
>          Issue Type: Bug
>          Components: Balancer
>    Affects Versions: 2.0.0, 1.3.0
>            Reporter: Ashu Pachauri
>            Assignee: David Pope
>             Fix For: 1.3.0
>
>         Attachments: HBASE-16810.patch, master.patch
>
>
> 1. Add a regionserver znode under /hbase/draining znode.
> 2. Use RegionMover to unload all regions from the regionserver.
> 3. Run balancer.
> {code}
> 16/09/21 14:17:33 ERROR ipc.RpcServer: Unexpected throwable object
> java.lang.ArrayIndexOutOfBoundsException: 75
>       at 
> org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer$Cluster.getLocalityOfRegion(BaseLoadBalancer.java:867)
>       at 
> org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer$LocalityCostFunction.cost(StochasticLoadBalancer.java:1186)
>       at 
> org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.computeCost(StochasticLoadBalancer.java:521)
>       at 
> org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.balanceCluster(StochasticLoadBalancer.java:309)
>       at 
> org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.balanceCluster(StochasticLoadBalancer.java:264)
>       at org.apache.hadoop.hbase.master.HMaster.balance(HMaster.java:1339)
>       at 
> org.apache.hadoop.hbase.master.MasterRpcServices.balance(MasterRpcServices.java:442)
>       at 
> org.apache.hadoop.hbase.protobuf.generated.MasterProtos$MasterService$2.callBlockingMethod(MasterProtos.java:58555)
>       at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2268)
>       at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:123)
>       at 
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:188)
>       at 
> org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:168)
> {code}



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