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https://issues.apache.org/jira/browse/HADOOP-19012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17815839#comment-17815839
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ASF GitHub Bot commented on HADOOP-19012:
-----------------------------------------
szetszwo opened a new pull request, #6542:
URL: https://github.com/apache/hadoop/pull/6542
### Description of PR
`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.
### How was this patch tested?
Added new tests.
### For code changes:
- [X] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [NA] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [NA] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [NA] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
> 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
>
> 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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