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