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https://issues.apache.org/jira/browse/HDFS-10359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15269055#comment-15269055
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Chris Nauroth commented on HDFS-10359:
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I also am not in favor of adding such a command, for the same reasons stated by
others. There has been a lot of work lately around reducing load generated by
block reports and staggering them to prevent a thundering herd problem. A mass
trigger for all DataNodes would circumvent those protections. If someone
really, really had a need to do this for some reason, then I suppose they could
script a sequence of single-node calls. That would at least introduce some
amount of throttling in the process.
> Allow trigger block report from all datanodes
> ---------------------------------------------
>
> Key: HDFS-10359
> URL: https://issues.apache.org/jira/browse/HDFS-10359
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 2.7.0, 2.6.1
> Reporter: Tao Jie
>
> Since we have HDFS-7278 allows trigger block report from one certain
> datanode. It would be helpful to add a option to this command to trigger
> block report from all datanodes.
> Command maybe like this:
> *hdfs dfsadmin -triggerBlockReport \[-incremental\]
> <datanode_host:ipc_port|all>*
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