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From "Vinayakumar B (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9445) Deadlock in datanode
Date Fri, 11 Dec 2015 04:56:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15052173#comment-15052173
] 

Vinayakumar B commented on HDFS-9445:
-------------------------------------

You are right [~cnauroth]. 

[~kihwal], Latest patch looks good to me. +1.

> Deadlock in datanode
> --------------------
>
>                 Key: HDFS-9445
>                 URL: https://issues.apache.org/jira/browse/HDFS-9445
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.7.2
>            Reporter: Kihwal Lee
>            Assignee: Walter Su
>            Priority: Blocker
>         Attachments: HDFS-9445.00.patch, HDFS-9445.01.patch, HDFS-9445.02.patch
>
>
> {noformat}
> Found one Java-level deadlock:
> =============================
> "DataXceiver for client DFSClient_attempt_xxx at /1.2.3.4:100 [Sending block BP-xxxxx:blk_123_456]":
>   waiting to lock monitor 0x00007f77d0731768 (object 0x00000000d60d9930, a org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl),
>   which is held by "Thread-565"
> "Thread-565":
>   waiting for ownable synchronizer 0x00000000d55613c8, (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync),
>   which is held by "DataNode: heartbeating to my-nn:8020"
> "DataNode: heartbeating to my-nn:8020":
>   waiting to lock monitor 0x00007f77d0731768 (object 0x00000000d60d9930, a org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetImpl),
>   which is held by "Thread-565"
> {noformat}



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