hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
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 17:22:19 GMT

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

Jonathan Gray updated HBASE-2253:

      Resolution: Fixed
    Hadoop Flags: [Reviewed]
          Status: Resolved  (was: Patch Available)

Committed to trunk, thanks Stack.

Included documentation around declaration of the variables and additional documentation in
the metrics stuff to explain what this hit ratio means.

> 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.

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

View raw message