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Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2014/05/18 07:02:15 UTC

[jira] [Updated] (HBASE-6506) Setting CACHE_BLOCKS to false in an hbase shell scan doesn't work

     [ https://issues.apache.org/jira/browse/HBASE-6506?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stack updated HBASE-6506:
-------------------------

    Fix Version/s: 0.99.0
           Status: Patch Available  (was: Open)

> 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
>             Fix For: 0.99.0
>
>         Attachments: 6506.txt
>
>   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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