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From "Zhihong Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6506) Setting CACHE_BLOCKS to false in an hbase shell scan doesn't work
Date Thu, 02 Aug 2012 23:29:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6506?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13427730#comment-13427730
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Zhihong Ted Yu commented on HBASE-6506:
---------------------------------------

Nice catch.
                
> Setting CACHE_BLOCKS to false in an hbase shell scan doesn't work
> -----------------------------------------------------------------
>
>                 Key: HBASE-6506
>                 URL: https://issues.apache.org/jira/browse/HBASE-6506
>             Project: HBase
>          Issue Type: Bug
>          Components: shell
>    Affects Versions: 0.94.0
>            Reporter: Josh Wymer
>            Priority: Minor
>              Labels: cache, ruby, scan, shell
>   Original Estimate: 1m
>  Remaining Estimate: 1m
>
> I was attempting to prevent blocks from being cached by setting CACHE_BLOCKS => false
in the hbase shell when doing a scan but I kept seeing tons of evictions when I ran it. After
inspecting "table.rb" I found this line:
> cache = args["CACHE_BLOCKS"] || true
> The problem then is that if CACHE_BLOCKS is false then this expression will always return
true. Therefore, it's impossible to turn off block caching. 

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