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https://issues.apache.org/jira/browse/HDFS-1241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170266#comment-13170266
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Uma Maheswara Rao G commented on HDFS-1241:
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Above comments were with respective to NameNode.
We have BackupNode based HA implementation internally. Also we have the
implementation of sending the block reports from DNs to BackupNode. Here the
possibility is that, when blockreceived command processing at Backup node side,
it can invoke lease.findPath() api and at the same time if we receive the new
journal call from active node to backup node, it can go into this situation.
> Possible deadlock between LeaseManager and FSDirectory
> ------------------------------------------------------
>
> Key: HDFS-1241
> URL: https://issues.apache.org/jira/browse/HDFS-1241
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.20.2, 0.21.0
> Reporter: Todd Lipcon
> Attachments: leasemanager.png
>
>
> LeaseManager.findPath() locks LeaseManager, then FSDirectory by caling
> getFileINode. FSDirectory.unprotectedDelete locks itself and then calls
> LeaseManager.removeLeaseWithPrefixPath. This cycle could deadlock.
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