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https://issues.apache.org/jira/browse/HBASE-16910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15604349#comment-15604349
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Guanghao Zhang commented on HBASE-16910:
----------------------------------------
Attach a patch for branch-1. It can be applied on branch-1 and branch-1.3. This
bug was introduced by HBASE-13965, it was applied on branch-1.3. So this fix
only need be applied on brnach-1.3 and branch-1, too. Thanks.
> Avoid NPE when starting StochasticLoadBalancer
> ----------------------------------------------
>
> Key: HBASE-16910
> URL: https://issues.apache.org/jira/browse/HBASE-16910
> Project: HBase
> Issue Type: Bug
> Components: Balancer
> Affects Versions: 2.0.0
> Reporter: Guanghao Zhang
> Assignee: Guanghao Zhang
> Priority: Minor
> Fix For: 2.0.0
>
> Attachments: HBASE-16910-branch-1.patch, HBASE-16910-v1.patch,
> HBASE-16910.patch
>
>
> When master start, it initialize StochasticLoadBalancer.
> {code}
> this.balancer.setClusterStatus(getClusterStatus());
> this.balancer.setMasterServices(this);
> {code}
> It first setClusterStatus(), then setMasterService(). But in setClusterStatus
> method, it use master service which is not initialized. So it will throw NPE.
> {code}
> int tablesCount = isByTable ? services.getTableDescriptors().getAll().size()
> : 1;
> {code}
> It happens when set isByTable is ture.
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