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https://issues.apache.org/jira/browse/HADOOP-19012?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18027973#comment-18027973
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ASF GitHub Bot commented on HADOOP-19012:
-----------------------------------------
slfan1989 commented on PR #8011:
URL: https://github.com/apache/hadoop/pull/8011#issuecomment-3375067137
> @slfan1989 , @steveloughran , trunk compilation failed. Do you know why?
@szetszwo Thank you for reporting this issue. I checked the compilation
information and saw the following error:
```
ERROR]
/home/jenkins/jenkins-agent/workspace/hadoop-multibranch_PR-8011/ubuntu-focal/src/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcServer.java:[216,50]
package org.checkerframework.checker.nullness.qual does not exist
[ERROR]
/home/jenkins/jenkins-agent/workspace/hadoop-multibranch_PR-8011/ubuntu-focal/src/hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcServer.java:[2509,30]
cannot find symbol
[ERROR] symbol: class NonNull
[ERROR] location: class
org.apache.hadoop.hdfs.server.federation.router.RouterRpcServer.AsyncThreadFactory
```
It was caused by `NonNull` not being recognized.
> 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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