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https://issues.apache.org/jira/browse/HDFS-13874?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Feng Yuan resolved HDFS-13874.
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Resolution: Not A Problem
After i recheck the code, i find it`s a mistake of mine.It is not a problem,
close.
> While there be mass Replication Queue Initializer thread
> --------------------------------------------------------
>
> Key: HDFS-13874
> URL: https://issues.apache.org/jira/browse/HDFS-13874
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.6.0
> Reporter: Feng Yuan
> Priority: Major
>
> I see dn register pipeline if it is a new dn, then will tick a thread named
> "Replication Queue Initializer thread".
> You can see DatanodeManager#checkIfClusterIsNowMultiRack
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