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https://issues.apache.org/jira/browse/HDFS-16284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18040103#comment-18040103
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ASF GitHub Bot commented on HDFS-16284:
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github-actions[bot] closed pull request #3586: HDFS-16284: Unboxing long value
in old version's block report cause full GC
URL: https://github.com/apache/hadoop/pull/3586
> Unboxing long value in old version's block report cause full GC
> ---------------------------------------------------------------
>
> Key: HDFS-16284
> URL: https://issues.apache.org/jira/browse/HDFS-16284
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Yuxuan Wang
> Assignee: Yuxuan Wang
> Priority: Major
> Labels: pull-request-available
> Time Spent: 40m
> Remaining Estimate: 0h
>
> When upgrade cluster from 2.6 to 3.1, namenode fall into full GC trouble.
> NN run 3.1 version and DN run 2.6 version, block report type is longs not PB
> introduced by https://issues.apache.org/jira/browse/HDFS-7435 . So it's run
> into LongDecoder.
> We find change
> org.apache.hadoop.hdfs.protocol.BlockListAsLongs.LongsDecoder#values type
> from List<Long> to long[] can fix the issue, but I can't for sure that the
> Long unboxing cause full GC problem.
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