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https://issues.apache.org/jira/browse/HDFS-6569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14037812#comment-14037812
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Brandon Li commented on HDFS-6569:
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Yes. It's a single node cluster with replication factor as 1.
> OOB message can't be sent to the client when DataNode shuts down for upgrade
> ----------------------------------------------------------------------------
>
> Key: HDFS-6569
> URL: https://issues.apache.org/jira/browse/HDFS-6569
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 3.0.0, 2.4.0
> Reporter: Brandon Li
>
> The socket is closed too early before the OOB message can be sent to client,
> which causes the write pipeline failure.
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