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https://issues.apache.org/jira/browse/HDFS-3087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228747#comment-13228747
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Kihwal Lee commented on HDFS-3087:
----------------------------------
Let's start from this: delay decommissioning until the NN gets out of the
start-up safemode. This can be done by inserting a safe mode check in
DecommissionManager.
> Decomissioning on NN restart can complete without blocks being replicated
> -------------------------------------------------------------------------
>
> Key: HDFS-3087
> URL: https://issues.apache.org/jira/browse/HDFS-3087
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.23.0, 0.24.0
> Reporter: Kihwal Lee
> Priority: Critical
> Fix For: 0.23.0, 0.24.0, 0.23.2, 0.23.3
>
>
> If a data node is added to the exclude list and the name node is restarted,
> the decomissioning happens right away on the data node registration. At this
> point the initial block report has not been sent, so the name node thinks the
> node has zero blocks and the decomissioning completes very quick, without
> replicating the blocks on that node.
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