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https://issues.apache.org/jira/browse/HDFS-15280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17112468#comment-17112468
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Xiaoqiao He commented on HDFS-15280:
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Hi [~hadoop_yangyun], I will close this JIRA if HDFS-7923 could solve your
case. Please feel free to reopen it or file another new ticket if you would
like to improve this feature.
> Datanode delay random time to report block if BlockManager is busy
> ------------------------------------------------------------------
>
> Key: HDFS-15280
> URL: https://issues.apache.org/jira/browse/HDFS-15280
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Yang Yun
> Assignee: Yang Yun
> Priority: Minor
> Attachments: HDFS-15280.001.diff, HDFS-15280.002.patch
>
>
> When many Datanodes are reporting at the same time, the cluster may respond
> slowly. Limit the concurrent reporting number. If BlockManager is busy, it
> rejects new request and the Datanode delay a few random time to report.
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