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https://issues.apache.org/jira/browse/HADOOP-19012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18029167#comment-18029167
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ASF GitHub Bot commented on HADOOP-19012:
-----------------------------------------
szetszwo merged PR #8011:
URL: https://github.com/apache/hadoop/pull/8011
> Use CRC tables to speed up galoisFieldMultiply in CrcUtil
> ---------------------------------------------------------
>
> Key: HADOOP-19012
> URL: https://issues.apache.org/jira/browse/HADOOP-19012
> Project: Hadoop Common
> Issue Type: Improvement
> Components: util
> Reporter: Tsz-wo Sze
> Assignee: Tsz-wo Sze
> Priority: Major
> Labels: pull-request-available
>
> CrcUtil.galoisFieldMultiply(p, q, m) supports multiplying two polynomials p,
> q modulo any modulus polynomial m over GF(2). Since the method is used for
> CRC calculations, the modulus polynomial m is restricted to either the
> GZIP_POLYNOMIAL or the CASTAGNOLI_POLYNOMIAL. We may use CRC tables in
> PureJavaCrc32/PureJavaCrc32C to speed up the computation.
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