[HBASE-10752] Port HBASE-10270 'Remove DataBlockEncoding from BlockCacheKey' to trunk

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.99.0
• Assignee: Ted Yu
• Reporter: Ted Yu
• Created: 14/Mar/14 19:52
• Updated: 21/Feb/15 23:30
• Resolved: 21/Mar/14 08:58

Description

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.

Issue Links

• is related to: HBASE-10270 Remove DataBlockEncoding from BlockCacheKey