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https://issues.apache.org/jira/browse/HBASE-10500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13898491#comment-13898491
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stack commented on HBASE-10500:
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Yeah, probably better. I can't think of case where tool would need to offheap.
If it does, lets deal then. Meantime, get these tools useable again when
offheap enabled.
> Some tools OOM when BucketCache is enabled
> ------------------------------------------
>
> Key: HBASE-10500
> URL: https://issues.apache.org/jira/browse/HBASE-10500
> Project: HBase
> Issue Type: Bug
> Components: HFile
> Affects Versions: 0.98.0, 0.96.0, 0.99.0
> Reporter: Nick Dimiduk
> Assignee: Nick Dimiduk
> Attachments: HBASE-10500.00.patch, HBASE-10500.01.patch
>
>
> Running {{hbck --repair}} or {{LoadIncrementalHFiles}} when BucketCache is
> enabled in offheap mode can cause OOM. This is apparently because
> {{bin/hbase}} does not include $HBASE_REGIONSERVER_OPTS for these tools. This
> results in HRegion or HFileReaders initialized with a CacheConfig that
> doesn't have the necessary Direct Memory.
> Possible solutions include:
> - disable blockcache in the config used by hbck when running its repairs
> - include HBASE_REGIONSERVER_OPTS in the HBaseFSCK startup arguments
> I'm leaning toward the former because it's possible that hbck is run on a
> host with different hardware profile as the RS.
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