Kihwal Lee created HDFS-15421:
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Summary: IBR leak causes standby NN to be stuck in safe mode
Key: HDFS-15421
URL: https://issues.apache.org/jira/browse/HDFS-15421
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Reporter: Kihwal Lee
After HDFS-14941, update of the global gen stamp is delayed in certain
situations. This makes the last set of incremental block reports from append
"from future", which causes it to be simply re-queued to the pending DN message
queue, rather than processed to complete the block. The last set of IBRs will
leak and never cleaned until it transitions to active. The size of
{{pendingDNMessages}} constantly grows until then.
If a leak happens while in a startup safe mode, the namenode will never be able
to come out of safe mode on its own.
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