Create config option to only cache index blocks
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Key: HBASE-4683
URL: https://issues.apache.org/jira/browse/HBASE-4683
Project: HBase
Issue Type: New Feature
Reporter: Lars Hofhansl
Priority: Minor
Fix For: 0.94.0
This would add a new boolean config option: hfile.block.cache.datablocks
Default would be true.
Setting this to false allows HBase in a mode where only index blocks are
cached, which is useful for analytical scenarios where a useful working set of
the data cannot be expected to fit into the cache.
This is the equivalent of setting all cacheBlocks to false on all scans
(including scans on behalf of gets).
I would like to general feeling about what folks think about this.
The change itself would be simple.
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