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From "Sean Mackrory (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-7642) NameNode should periodically log DataNode decommissioning progress
Date Mon, 03 Oct 2016 20:10:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-7642?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sean Mackrory updated HDFS-7642:
--------------------------------
    Attachment: HDFS-7642.001.patch

Attaching an initial implementation. I'm wondering if hostname is guaranteed to be non-empty
- if it isn't, it may be safer (but less human readable) to use the node's uuid instead. Since
this just runs every 30 seconds (configurable) it isn't synchronized with the actual state
changes of the nodes, so I added a '~' to the log message to convey that it's just an approximation.

> NameNode should periodically log DataNode decommissioning progress
> ------------------------------------------------------------------
>
>                 Key: HDFS-7642
>                 URL: https://issues.apache.org/jira/browse/HDFS-7642
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Zhe Zhang
>            Assignee: Sean Mackrory
>            Priority: Minor
>         Attachments: HDFS-7642.001.patch
>
>
> We've see a case where the decommissioning was stuck due to some files have more replicas
then DNs. HDFS-5662 fixes this particular issue but there are other use cases where the decommissioning
process might get stuck or slow down. Some monitoring / logging will help debugging those
issues.



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