Ted Yu created HBASE-10752:
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Summary: Port HBASE-10270 'Remove DataBlockEncoding from
BlockCacheKey' to trunk
Key: HBASE-10752
URL: https://issues.apache.org/jira/browse/HBASE-10752
Project: HBase
Issue Type: Improvement
Reporter: Ted Yu
Assignee: Ted Yu
Priority: Minor
The JIRA removes the block encoding from the key and forces the caller of
HFileReaderV2.readBlock() to specify the expected BlockType as well as the
expected DataBlockEncoding when these matter. This allows for a decision on
either of these at read time instead of cache time, puts responsibility where
appropriate, fixes some cache misses when using the scan preloading (which does
a read without knowing the type or encoding), allows for the BlockCacheKey to
be re-used by the L2 BucketCache and sets us up for a future CompoundScannerV2
which can read both un-encoded and encoded data blocks.
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