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From "Yi Liang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3287) Add option to cache blocks on hfile write and evict blocks on hfile close
Date Wed, 10 Aug 2011 01:31:28 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082080#comment-13082080
] 

Yi Liang commented on HBASE-3287:
---------------------------------

@stack You mean there's something wrong with this patch? So what should we do if we want to
enable this option? Use the code from trunk? IMO a correct patch against 0.90 will be very
useful until 0.92.0 releases as this feature is so critical for online service.

> Add option to cache blocks on hfile write and evict blocks on hfile close
> -------------------------------------------------------------------------
>
>                 Key: HBASE-3287
>                 URL: https://issues.apache.org/jira/browse/HBASE-3287
>             Project: HBase
>          Issue Type: New Feature
>          Components: io, regionserver
>    Affects Versions: 0.90.0
>            Reporter: Jonathan Gray
>            Assignee: Jonathan Gray
>             Fix For: 0.92.0
>
>         Attachments: HBASE-3287-FINAL-trunk.patch
>
>
> This issue is about adding configuration options to add/remove from the block cache when
creating/closing files.  For use cases with lots of flushing and compacting, this might be
desirable to prevent cache misses and maximize the effective utilization of total block cache
capacity.
> The first option, {{hbase.rs.cacheblocksonwrite}}, will make it so we pre-cache blocks
as we are writing out new files.
> The second option, {{hbase.rs.evictblocksonclose}}, will make it so we evict blocks when
files are closed.

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