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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-11581) Add option so CombinedBlockCache L2 can be null (fscache)
Date Thu, 24 Jul 2014 00:20:38 GMT
stack created HBASE-11581:
-----------------------------

             Summary: Add option so CombinedBlockCache L2 can be null (fscache)
                 Key: HBASE-11581
                 URL: https://issues.apache.org/jira/browse/HBASE-11581
             Project: HBase
          Issue Type: New Feature
          Components: BlockCache
            Reporter: stack
            Priority: Minor


Add option, mostly for comparison's sake, that allows a deploy orchestrated by CombinedBlockCache
such that its L1 is LruBlockCache for META blocks but DATA blocks are fetched each time (we
don't try and cache them, no blockcache churn).

In operation, i can see fscache coming around to cover the fetched DATA blocks such that if
the DATA blocks fit in fscache, seeks go to zero.

This setup for sure runs slower.  Will publish numbers elsewhere.  Meantime, here is a patch
to enable this option.



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