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https://issues.apache.org/jira/browse/HBASE-16910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15604316#comment-15604316
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Ashish Singhi commented on HBASE-16910:
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We faced this issue yesterday in one of our test cluster also which is based on
branch-1.0.
[~zghaobac], can you provide patch for other branches also. If not let me know
I can prepare the patches.
Ideally bug fix should go to all the running versions.
> 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-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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