[HBASE-14738] Backport HBASE-11927 (Use Native Hadoop Library for HFile checksum) to 0.98

• Type: Task
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Assignee: Unassigned
• Reporter: Andrew Kyle Purtell
• Created: 01/Nov/15 20:52
• Updated: 16/Jun/22 05:59
• Resolved: 12/Jun/22 18:25

Description

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:

1. 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.
2. Need a shim for differences between Hadoop's DataChecksum type.

Issue Links

• is related to: HBASE-11927 Use Native Hadoop Library for HFile checksum (And flip default from CRC32 to CRC32C)