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From "Ming Ma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11378) Verify multiple DataNodes can be decommissioned/maintenance at the same time
Date Fri, 27 Jan 2017 18:06:24 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15843195#comment-15843195
] 

Ming Ma commented on HDFS-11378:
--------------------------------

The patch LGTM. Thanks [~manojg] for the useful test cases! We might want to add test cases
of putting some nodes to decommission and other nodes to maintenance at the same time. But
that can be done in a separate jira unless it is your attention to do it here.

> Verify multiple DataNodes can be decommissioned/maintenance at the same time
> ----------------------------------------------------------------------------
>
>                 Key: HDFS-11378
>                 URL: https://issues.apache.org/jira/browse/HDFS-11378
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Manoj Govindassamy
>            Assignee: Manoj Govindassamy
>         Attachments: HDFS-11378.01.patch
>
>
> DecommissionManager is capable of transitioning multiple DataNodes to Decommission/Maintenance
states. Current tests under TestDecommission and TestMaintenanceState only request for one
DataNode for Decommission/Maintenance. Better if we can simulate real world cases whereby
multiple DataNodes can be taken out of service and verify the resulting block replication
factor for the files.



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