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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2253) Show Block cache hit ratio for requests where cacheBlocks=true
Date Tue, 23 Feb 2010 19:57:28 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12837417#action_12837417
] 

Jean-Daniel Cryans commented on HBASE-2253:
-------------------------------------------

One point of discussion here is whether we should only show the hit rate for cacheBlocks=true
or both.

> Show Block cache hit ratio for requests where cacheBlocks=true
> --------------------------------------------------------------
>
>                 Key: HBASE-2253
>                 URL: https://issues.apache.org/jira/browse/HBASE-2253
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: Dave Latham
>            Priority: Minor
>
> We've been disabling block caching for MR jobs and other big scans.  It seems to improve
cache performance, but it's difficult to measure the hit ratio because even scans that don't
cache blocks still request blocks from the cache (which is good), and those requests affect
the hit/miss stats, which makes it difficult to see how the queries where cacheBlocks=true
are performing.

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