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https://issues.apache.org/jira/browse/AMBARI-21731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16130135#comment-16130135
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nijel commented on AMBARI-21731:
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bq. "Minimum number of Under-Replicated Blocks" has reached.
will be good if it can be specified in % as well.
> Rolling Decommission of HDFS Datanodes
> --------------------------------------
>
> Key: AMBARI-21731
> URL: https://issues.apache.org/jira/browse/AMBARI-21731
> Project: Ambari
> Issue Type: New Feature
> Components: ambari-server
> Affects Versions: 2.5.1
> Reporter: Shahrukh Khan
> Labels: datanode, decommision, hdfs, rolling, rolling_decommision
>
> Implement feature of Rolling Decommission for HDFS Datanodes.
> Use "Under-Replicated Blocks" as parameter for Rolling Decommission, Instead
> of Wait Time.
> E.g. - To decommission 100 HDFS Datanodes - with rolling decommission of 3
> nodes at a time, a batch of decommission should trigger when a threshold of -
> "Minimum number of Under-Replicated Blocks" has reached.
> *Note - Minimum Threshold of - "Under-Replicated Blocks" has to be taken care
> so that we don't end up in a situation with huge load on HDFS Namenode and
> high number of Under Replicated Blocks - Specially with Datanodes of huge
> Data size ( ~ TB )
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