Kihwal Lee created HDFS-5162:
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Summary: Name node crashes due to improper synchronization in
RetryCache
Key: HDFS-5162
URL: https://issues.apache.org/jira/browse/HDFS-5162
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Kihwal Lee
Priority: Blocker
In LightWeightCache#evictExpiredEntries(), the precondition check can fail.
[~patwhitey2007] ran a HA failover test and it occurred while the SBN was
catching up with edits during a transition to active. This caused NN to
terminate.
Here is my theory: If an RPC handler calls waitForCompletion() and it happens
to remove the head of the queue in get(), it will race with
evictExpiredEntries() frrom put().
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