stack created HBASE-11581:
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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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