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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2016/04/20 08:22:25 UTC

[jira] [Commented] (HBASE-15386) PREFETCH_BLOCKS_ON_OPEN in HColumnDescriptor is ignored

    [ https://issues.apache.org/jira/browse/HBASE-15386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15249354#comment-15249354 ] 

stack commented on HBASE-15386:
-------------------------------

Here is a patch that adds a test that shows this actually works.

Also changes some logging so easier to see what is going on around prefetch.

Set +log4j.logger.org.apache.hadoop.hbase.io.hfile.HFileReaderV2=TRACE to see prefetch in action.



> PREFETCH_BLOCKS_ON_OPEN in HColumnDescriptor is ignored
> -------------------------------------------------------
>
>                 Key: HBASE-15386
>                 URL: https://issues.apache.org/jira/browse/HBASE-15386
>             Project: HBase
>          Issue Type: Sub-task
>          Components: BucketCache
>            Reporter: stack
>            Assignee: stack
>
> We use the global flag hbase.rs.prefetchblocksonopen only and ignore the HCD setting.
> Purge from HCD or hook it up again (it probably worked once).
> Thanks to Daniel Pol for finding this one. Let me fix.



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