Erik Krogen created HDFS-11352:
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Summary: Potential deadlock in NN when failing over
Key: HDFS-11352
URL: https://issues.apache.org/jira/browse/HDFS-11352
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: 2.7.4, 2.6.6
Reporter: Erik Krogen
Assignee: Erik Krogen
HDFS-11180 fixed a general class of deadlock that can occur when failing over
between the MetricsSystemImpl and FSEditLog (see comments on that JIRA for more
details). In trunk and branch-2/branch-2.8 this fix was successful by making
the metrics calls not synchronize on FSEditLog.
In branch-2.6 and branch-2.7 there is one more method,
{{FSNamesystem#getTransactionsSinceLastCheckpoint}}, which still requires the
lock on FSEditLog and thus can result in the same deadlock scenario. This can
be seen by running {{TestFSNamesystemMBean#testWithFSEditLogLock}} _with the
patch in HDFS-11290_ on either of these branches (it fails currently).
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