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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5162) Name node crashes due to improper synchronization in RetryCache
Date Wed, 04 Sep 2013 16:40:51 GMT
Kihwal Lee created HDFS-5162:
--------------------------------

             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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