[ https://issues.apache.org/jira/browse/HDFS-5832?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Rakesh R updated HDFS-5832:
---------------------------

    Attachment: HDFS-5832.patch

Attaching a proposal where I have moved the namesystem.isInSafeMode(); out of datanodeMap lock. Could someone help me to validate this case. Thanks

> Deadeadlock found in NN between SafeMode#canLeave and DatanodeManager#handleHeartbeat
> -------------------------------------------------------------------------------------
>
>                 Key: HDFS-5832
>                 URL: https://issues.apache.org/jira/browse/HDFS-5832
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 3.0.0
>            Reporter: Rakesh R
>            Assignee: Rakesh R
>            Priority: Blocker
>         Attachments: HDFS-5832.patch, jcarder_nn_deadlock.gif
>
>
> Found the deadlock during the Namenode startup. Attached jcarder report which shows the cycles about the deadlock situation.



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