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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HBASE-14291) NPE On StochasticLoadBalancer Balance Involving RS With No Regions
Date Sat, 22 Aug 2015 11:42:45 GMT

     [ https://issues.apache.org/jira/browse/HBASE-14291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ted Yu reassigned HBASE-14291:
------------------------------

    Assignee: Ted Yu

> NPE On StochasticLoadBalancer Balance Involving RS With No Regions
> ------------------------------------------------------------------
>
>                 Key: HBASE-14291
>                 URL: https://issues.apache.org/jira/browse/HBASE-14291
>             Project: HBase
>          Issue Type: Bug
>          Components: Balancer
>    Affects Versions: 2.0.0
>         Environment: Pseudo-distributed (2 local RegionServers), Hadoop 2.5.1, Java 1.7.0_71
>            Reporter: Matt Warhaftig
>            Assignee: Ted Yu
>            Priority: Minor
>         Attachments: hbase-mwarhaftig-master-Matts-MBP.log
>
>
> When StochasticLoadBalancer attempts to balance a local RS with multiple regions with
another local RS that had no regions the HBase shell call of 'balancer' gets the following
NPE:
> {noformat}
> ERROR: java.io.IOException
> 	at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2175)
> 	at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:106)
> 	at org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:130)
> 	at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:107)
> 	at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.NullPointerException
> 	at org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer$Cluster.getLeastLoadedTopServerForRegion(BaseLoadBalancer.java:863)
> 	at org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer$LocalityBasedCandidateGenerator.generate(StochasticLoadBalancer.java:724)
> 	at org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.balanceCluster(StochasticLoadBalancer.java:325)
> 	at org.apache.hadoop.hbase.master.balancer.StochasticLoadBalancer.balanceCluster(StochasticLoadBalancer.java:263)
> 	at org.apache.hadoop.hbase.master.HMaster.balance(HMaster.java:1264)
> 	at org.apache.hadoop.hbase.master.MasterRpcServices.balance(MasterRpcServices.java:413)
> 	at org.apache.hadoop.hbase.protobuf.generated.MasterProtos$MasterService$2.callBlockingMethod(MasterProtos.java:52450)
> 	at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2133)
> 	... 4 more
> {noformat}
> Issue only occurs when one of the RSs has no regions before balancing.  Also, unsure
if distributed RSs would also have same issue.  Attached 'hbase-mwarhaftig-master-Matts-MBP.log'
is master's log of the error occurring.  
> SimpleLoadBalancer rebalances correctly when used in the same situation.  



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