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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-2253) Show Block cache hit ratio for requests where cacheBlocks=true
Date Sat, 30 Oct 2010 02:18:20 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2253?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jonathan Gray updated HBASE-2253:

    Status: Patch Available  (was: Open)

Patch up for review on rb.

> Show Block cache hit ratio for requests where cacheBlocks=true
> --------------------------------------------------------------
>                 Key: HBASE-2253
>                 URL: https://issues.apache.org/jira/browse/HBASE-2253
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Dave Latham
>            Assignee: Jonathan Gray
>            Priority: Minor
>             Fix For: 0.90.0
> 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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