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https://issues.apache.org/jira/browse/HADOOP-7443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064246#comment-13064246
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Tsz Wo (Nicholas), SZE commented on HADOOP-7443:
------------------------------------------------
Hi Todd, you actually has updated the table-generating code. You may run it
with the (reversed) polynomial, then you will get the CRC32C tables.
{noformat}
$java -cp build/test/classes/:build/classes/
org.apache.hadoop.util.TestPureJavaCrc32\$Table 82F63B78
{noformat}
> Add CRC32C as another DataChecksum implementation
> -------------------------------------------------
>
> Key: HADOOP-7443
> URL: https://issues.apache.org/jira/browse/HADOOP-7443
> Project: Hadoop Common
> Issue Type: New Feature
> Components: io, util
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hadoop-7443.txt
>
>
> CRC32C is another checksum very similar to our existing CRC32, but with a
> different polynomial. The chief advantage of this other polynomial is that
> SSE4.2 includes hardware support for its calculation. HDFS-2080 is the
> umbrella JIRA which proposes using this new polynomial to save substantial
> amounts of CPU.
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