Ahmed Hussein created HDFS-15622:
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Summary: 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
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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