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From "Jason Dai (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6312) Make BlockCache eviction thresholds configurable
Date Wed, 04 Jul 2012 14:34:36 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13406553#comment-13406553
] 

Jason Dai commented on HBASE-6312:
----------------------------------

If we do not expose the acceptable factor and minimum factor, the hfile.block.cache.size parameter
can be very confusing (for the user to properly configure the cache size behavior). Just as
J-D mentioned, if the user want 2GB cache, he needs to set the parameter to ~2.35GB, and he
needs to understand the HBase implementation details to do that. This looks a lot like hacking,
not a user friendly interface. Maybe We should evict only after cache size is large than hfile.block.cache.size,
and allow ~15% burstiness before blocking.

                
> Make BlockCache eviction thresholds configurable
> ------------------------------------------------
>
>                 Key: HBASE-6312
>                 URL: https://issues.apache.org/jira/browse/HBASE-6312
>             Project: HBase
>          Issue Type: Improvement
>          Components: io
>    Affects Versions: 0.94.0
>            Reporter: Jie Huang
>            Priority: Minor
>         Attachments: hbase-6312.patch
>
>
> Some of our customers found that tuning the BlockCache eviction thresholds made test
results different in their test environment. However, those thresholds are not configurable
in the current implementation. The only way to change those values is to re-compile the HBase
source code. We wonder if it is possible to make them configurable.

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