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https://issues.apache.org/jira/browse/HDFS-14849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16944096#comment-16944096
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Wei-Chiu Chuang commented on HDFS-14849:
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Cherrypicked the commit to branch-3.2 without conflicts.
There is a trivial conflict for branch-3.1. So attached a patch
[^HDFS-14849.branch-3.1.patch] for posterity.
> Erasure Coding: the internal block is replicated many times when datanode is
> decommissioning
> --------------------------------------------------------------------------------------------
>
> Key: HDFS-14849
> URL: https://issues.apache.org/jira/browse/HDFS-14849
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ec, erasure-coding
> Affects Versions: 3.3.0
> Reporter: HuangTao
> Assignee: HuangTao
> Priority: Major
> Labels: EC, HDFS, NameNode
> Fix For: 3.3.0, 3.1.4, 3.2.2
>
> Attachments: HDFS-14849.001.patch, HDFS-14849.002.patch,
> HDFS-14849.branch-3.1.patch, fsck-file.png, liveBlockIndices.png,
> scheduleReconstruction.png
>
>
> When the datanode keeping in DECOMMISSION_INPROGRESS status, the EC internal
> block in that datanode will be replicated many times.
> // added 2019/09/19
> I reproduced this scenario in a 163 nodes cluster with decommission 100 nodes
> simultaneously.
> !scheduleReconstruction.png!
> !fsck-file.png!
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