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From "Kuhu Shukla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12754) Lease renewal can hit a deadlock
Date Wed, 01 Nov 2017 22:57:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16234905#comment-16234905
] 

Kuhu Shukla commented on HDFS-12754:
------------------------------------

This deadlock was found during testing on our end about an year or so ago. The fix (attached
patch) was deployed to our production clusters ever since and has had significant amount of
run time.

> Lease renewal can hit a deadlock 
> ---------------------------------
>
>                 Key: HDFS-12754
>                 URL: https://issues.apache.org/jira/browse/HDFS-12754
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.8.1
>            Reporter: Kuhu Shukla
>            Assignee: Kuhu Shukla
>            Priority: Major
>         Attachments: HDFS-12754.001.patch
>
>
> The Client and the renewer can hit a deadlock during close operation since closeFile()
reaches back to the DFSClient#removeFileBeingWritten. This is possible if the client class
close when the renewer is renewing a lease.



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