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From "Guanghao Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16910) Avoid NPE when starting StochasticLoadBalancer
Date Tue, 25 Oct 2016 06:19:58 GMT

    [ 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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