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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