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https://issues.apache.org/jira/browse/HDFS-15622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17219709#comment-17219709
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Ahmed Hussein commented on HDFS-15622:
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Thanks [~kihwal]!
> Deleted blocks linger in the replications queue
> -----------------------------------------------
>
> Key: HDFS-15622
> URL: https://issues.apache.org/jira/browse/HDFS-15622
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs
> Reporter: Ahmed Hussein
> Assignee: Ahmed Hussein
> Priority: Major
> Fix For: 3.3.1, 3.4.0, 3.1.5, 3.2.3
>
> Attachments: HDFS-15622.001.patch, HDFS-15622.002.patch
>
>
> We had incident whereas after resolving a missing blocks incident by
> restarting two dead nodes, there were still 8 missing, but the list was
> empty. Metasave shows the 8 blocks are "orphaned" meaning the files were
> already deleted. It is unclear why they were left in the replication queue.
> * The containing node was flaky and started stoped multiple time.
> * The block allocation didn't work well due to the cluster-level storage
> space exhaustion.
> * The NN was in safe mode.
> Triggering a full block report from the node didn't have any effect. It will
> clear up if a failover happens as the repl queue will be reinitialized.
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