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https://issues.apache.org/jira/browse/HBASE-15976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15352416#comment-15352416
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Jingcheng Du commented on HBASE-15976:
--------------------------------------

Thanks for reviews [~ashish singhi] and [~ram_krish]. Pushed to master and 
branch-1.
Hi [~apurtell], [~ndimiduk], [~enis], [~busbey], [~mantonov], do you want this 
minor change for NPE to 0.98+ branches? Thanks a lot.

> RegionServerMetricsWrapperRunnable will be failure  when disable blockcache.
> ----------------------------------------------------------------------------
>
>                 Key: HBASE-15976
>                 URL: https://issues.apache.org/jira/browse/HBASE-15976
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.15, 1.2.1, 1.0.3, 1.1.5
>            Reporter: Liu Junhong
>            Assignee: Jingcheng Du
>         Attachments: HBASE-15976-0.98.patch, 
> HBASE-15976-branch-1&branch-1.3.patch, HBASE-15976-branch-1.0.patch, 
> HBASE-15976-branch-1.1.patch, HBASE-15976-branch-1.2.patch, 
> HBASE-15976-master.patch
>
>
> When i disable blockcache, the code "cacheStats = blockCache.getStats();" 
> will occur NPE in 
> org.apache.hadoop.hbase.regionserver.MetricsRegionServerWrapperImpl.RegionServerMetricsWrapperRunnable.
> It lead to many regionserver's metrics' value always equal 0.



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