[jira] [Commented] (HDFS-16284) Unboxing long value in old version's block report cause full GC

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-16284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18040020#comment-18040020 ] 

ASF GitHub Bot commented on HDFS-16284:
---------------------------------------

github-actions[bot] commented on PR #3586:
URL: https://github.com/apache/hadoop/pull/3586#issuecomment-3565083626

   We're closing this stale PR because it has been open for 100 days with no activity. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
   If you feel like this was a mistake, or you would like to continue working on it, please feel free to re-open it and ask for a committer to remove the stale tag and review again.
   Thanks all for your contribution.




> 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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