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Date: Wed, 1 Nov 2017 22:57:00 +0000 (UTC)
From: "Kuhu Shukla (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13115448.1509565437000.126387.1509577020163@Atlassian.JIRA>
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Subject: [jira] [Commented] (HDFS-12754) Lease renewal can hit a deadlock
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archived-at: Wed, 01 Nov 2017 22:57:04 -0000


    [ 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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