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https://issues.apache.org/jira/browse/HDFS-10359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15269106#comment-15269106
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Kihwal Lee commented on HDFS-10359:
-----------------------------------
Although this will be an excellent stress test tool, it will probably be best
to not make it easy for users to unleash the beast.
If an admin somehow wants to do it, one can write a simple script to get the
list of nodes and issue the existing dfsadmin command to all nodes.
> 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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