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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-10752) Port HBASE-10270 'Remove DataBlockEncoding from BlockCacheKey' to trunk
Date Fri, 14 Mar 2014 21:44:45 GMT

     [ https://issues.apache.org/jira/browse/HBASE-10752?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ted Yu updated HBASE-10752:
---------------------------

    Fix Version/s: 0.99.0

> 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
>             Fix For: 0.99.0
>
>         Attachments: 10752-v1.txt, 10752-v2.txt
>
>
> 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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