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From "Tao Jie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10359) Allow trigger block report from all datanodes
Date Wed, 04 May 2016 02:16:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15270024#comment-15270024

Tao Jie commented on HDFS-10359:

[~kihwal], [~cnauroth], [~arpitagarwal], [~linyiqun] Thank you for reply´╝ü
I understand that trigger block report for all datanode would bring too much presure for namenode.
Our scenario is we use *setrep -w* command to ensure replications of blocks on all datanodes
sometime. Blocks on datanode may lost somehow, however namenode would not notice block missing
until block report in 6 hours. In this case, we suppose to trigger block report for all datanodes
before *setrep -w*. Further more, if we want to set replication of blocks to 1, some blocks
may corrupt.
It is OK to use a script to trigger block report from all datenodes, or just restart namenode.
I am not very familiar with this logic, if I am wrong or there is a better way, please correct

> 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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