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https://issues.apache.org/jira/browse/HADOOP-7445?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HADOOP-7445:
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Attachment: hadoop-7445.txt
Finally snuck some time to update this based on your feedback. How does this
look? I split up the code into the following files:
- NativeCrc32c: just JNI wrappers
- bulk_crc32.{c,h}: a "C style" API for bulk checksum verification
- crc32.h: the actual implementations (to be inlined)
- gcc_optimizations.h: the macros for builtin_expect, now used from multiple
spots
I ran TestDataChecksum with native code built, and with -Xcheck:jni enabled,
and it passes.
> Implement bulk checksum verification using efficient native code
> ----------------------------------------------------------------
>
> Key: HADOOP-7445
> URL: https://issues.apache.org/jira/browse/HADOOP-7445
> Project: Hadoop Common
> Issue Type: Improvement
> Components: native, util
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hadoop-7445.txt, hadoop-7445.txt, hadoop-7445.txt
>
>
> Once HADOOP-7444 is implemented ("bulk" API for checksums), good performance
> gains can be had by implementing bulk checksum operations using JNI. This
> JIRA is to add checksum support to the native libraries. Of course if native
> libs are not available, it will still fall back to the pure-Java
> implementations.
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