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https://issues.apache.org/jira/browse/HDFS-11378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15843201#comment-15843201
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Manoj Govindassamy commented on HDFS-11378:
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Thanks for the review [~mingma]. Sure, multiple DNs in maintenance and
decommission in parallel is also an interesting case. Am also planning for few
more corner cases like min replication not met when N-1 or N-2 of the nodes are
asked for Maintenance/Decom and DNs need to be recommissioned for the other
ones to go IN_MAINTENANCE. Will add these tests in the next batch. Thanks.
> 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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