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https://issues.apache.org/jira/browse/HDFS-11285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15922869#comment-15922869
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Andrew Wang commented on HDFS-11285:
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Interesting. Do you think this is possibly related to HDFS-11499? The block
might be stuck in committed state since the only remaining replicas are D_I_P.
> Dead DataNodes keep a long time in (Dead, DECOMMISSION_INPROGRESS), and never
> transition to (Dead, DECOMMISSIONED)
> ------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-11285
> URL: https://issues.apache.org/jira/browse/HDFS-11285
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.7.1
> Reporter: Lantao Jin
> Attachments: DecomStatus.png
>
>
> We have seen the use case of decommissioning DataNodes that are already dead
> or unresponsive, and not expected to rejoin the cluster. In a large cluster,
> we met more than 100 nodes were dead, decommissioning and their {{Under
> replicated blocks}} {{Blocks with no live replicas}} were all ZERO. Actually
> It has been fixed in
> [HDFS-7374|https://issues.apache.org/jira/browse/HDFS-7374]. After that, we
> can refreshNode twice to eliminate this case. But, seems this patch missed
> after refactor[HDFS-7411|https://issues.apache.org/jira/browse/HDFS-7411]. We
> are using a Hadoop version based 2.7.1 and only below operations can
> transition the status from {{Dead, DECOMMISSION_INPROGRESS}} to {{Dead,
> DECOMMISSIONED}}:
> # Retire it from hdfs-exclude
> # refreshNodes
> # Re-add it to hdfs-exclude
> # refreshNodes
> So, why the code removed after refactor in the new DecommissionManager?
> {code:java}
> if (!node.isAlive) {
> LOG.info("Dead node " + node + " is decommissioned immediately.");
> node.setDecommissioned();
> {code}
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