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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2970) Meta blocks should be given their own priority bucket in block cache
Date Wed, 08 Sep 2010 20:52:32 GMT
Meta blocks should be given their own priority bucket in block cache
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                 Key: HBASE-2970
                 URL: https://issues.apache.org/jira/browse/HBASE-2970
             Project: HBase
          Issue Type: Improvement
          Components: io, regionserver
            Reporter: Jonathan Gray
            Assignee: Jonathan Gray
             Fix For: 0.90.0


Bloom filters are currently using the LRU block cache.  They are being treated as normal data
blocks, however, it would be advantageous if we could treat me separately and give them their
own portion of the LRU.

What we've seen in practice is that some blooms get very big and are accessed frequently.
 This leads to blooms consuming a majority of the cache so lots of churn on data blocks.

In any case, I think it is desirable in general to be able to control how much memory is used
for blooms and other meta data.

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