[jira] [Commented] (HDFS-10480) Add an admin command to list currently open files

["Adam Kennedy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HDFS-10480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15977835#comment-15977835 ] 

Adam Kennedy commented on HDFS-10480:
-------------------------------------

With thousand+ node clusters, where you might be adding and removing machines regularly for maintenance, a huge use case on top of the directory filter would be a "which open files are blocking server decommissioning" filter (identify files with blocks on hosts that are currently in decommisioning state).

This is very difficult right now, and particularly annoying when by chance you try to decom the node holding the long-open HDFS balancer pid file.

> Add an admin command to list currently open files
> -------------------------------------------------
>
>                 Key: HDFS-10480
>                 URL: https://issues.apache.org/jira/browse/HDFS-10480
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Kihwal Lee
>            Assignee: Rushabh S Shah
>         Attachments: HDFS-10480-trunk-1.patch, HDFS-10480-trunk.patch
>
>
> Currently there is no easy way to obtain the list of active leases or files being written. It will be nice if we have an admin command to list open files and their lease holders.



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