Potential NN deadlock in processDistributedUpgradeCommand
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Key: HDFS-862
URL: https://issues.apache.org/jira/browse/HDFS-862
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.22.0
Reporter: Todd Lipcon
Haven't seen this in practice, but the lock order is inconsistent.
processReport locks FSNamesystem, then calls UpgradeManager.startUpgrade,
getUpgradeState, and getUpgradeStatus (each of which locks the UpgradeManager).
FSNameSystem.processDistributedUpgradeCommand calls
upgradeManager.processUpgradeCommand which is synchronized on UpgradeManager,
which can call FSNameSystem.leaveSafeMode which synchronizes on FSNamesystem.
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