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From "Josh Wymer (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6506) Setting CACHE_BLOCKS to false in an hbase shell scan doesn't work
Date Thu, 02 Aug 2012 23:25:02 GMT
Josh Wymer created HBASE-6506:
---------------------------------

             Summary: 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


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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