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https://issues.apache.org/jira/browse/HDFS-14678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16895664#comment-16895664
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Chao Sun commented on HDFS-14678:
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cc [~jojochuang]: could you add [~LeonG] as contributor and assign this JIRA to
him? also it would be great if you know whether this issue has been raised
before or not :) - it is one of the items we want to improve in H2.
> Allow triggerBlockReport to a specific namenode
> -----------------------------------------------
>
> Key: HDFS-14678
> URL: https://issues.apache.org/jira/browse/HDFS-14678
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 2.8.2
> Reporter: Leon Gao
> Priority: Minor
>
> In our largest prod cluster (running 2.8.2) we have >3k hosts. Every time
> when rolling restarting NNs we will need to wait for block report which takes
> >2.5 hours for each NN.
> One way to make it faster is to manually trigger a full block report from all
> datanodes. [HDFS-7278|https://issues.apache.org/jira/browse/HDFS-7278].
> However, the current triggerBlockReport command will trigger a block report
> on all NNs which will flood the active NN as well.
> A quick solution will be adding an option to specify a NN that the manually
> triggered block report will go to, something like:
> *_hdfs dfsadmin [-triggerBlockReport [-incremental] <datanode_host:ipc_port>]
> [-namenode] <namenode_host:ipc_port>_*
> So when doing a restart of standby NN or observer NN we can trigger an
> aggressive block report to a specific NN to exit safemode faster without
> risking active NN performance.
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