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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-14738) Backport HBASE-11927 (Use Native Hadoop Library for HFile checksum) to 0.98
Date Sun, 01 Nov 2015 20:52:27 GMT
Andrew Purtell created HBASE-14738:
--------------------------------------

             Summary: Backport HBASE-11927 (Use Native Hadoop Library for HFile checksum)
to 0.98
                 Key: HBASE-14738
                 URL: https://issues.apache.org/jira/browse/HBASE-14738
             Project: HBase
          Issue Type: Task
            Reporter: Andrew Purtell
            Assignee: Andrew Purtell
             Fix For: 0.98.16


Profiling 0.98.15 I see 20-30% of CPU time spent in Hadoop's PureJavaCrc32. Not surprising
given previous results described on HBASE-11927. Backport.

There are two issues with the backport:

# The patch on 11927 changes the default CRC type from CRC32 to CRC32C. Although the changes
are backwards compatible -files with either CRC type will be handled correctly in a transparent
manner - we should probably leave the default alone in 0.98 and advise users on a site configuration
change to use CRC32C if desired, for potential hardware acceleration.

# Need a shim for differences between Hadoop's DataChecksum type.



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