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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-10752) Port HBASE-10270 'Remove DataBlockEncoding from BlockCacheKey' to trunk
Date Fri, 14 Mar 2014 19:52:52 GMT
Ted Yu created HBASE-10752:
------------------------------

             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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