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Date: Wed, 27 Jan 2016 13:55:39 +0000 (UTC)
From: "Vinayakumar B (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-9701) DN may deadlock when hot-swapping
 under load
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    [ https://issues.apache.org/jira/browse/HDFS-9701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15119255#comment-15119255 ] 

Vinayakumar B commented on HDFS-9701:
-------------------------------------

One issue I am seeing here is in {{FSVolumeList#checkDirs()}}
{code}
   private final VolumeChoosingPolicy<FsVolumeImpl> blockChooser;
@@ -257,10 +260,33 @@ public void run() {
             + " failure volumes.");
       }
 
+      waitVolumeRemoved(5000, this);
       return failedVols;
     }
   }{code}
I believe, this call will get, {{IllegalMonitorStateException}}.
{{checkDirsMutex}} should be passed instead of {{this}}

> DN may deadlock when hot-swapping under load
> --------------------------------------------
>
>                 Key: HDFS-9701
>                 URL: https://issues.apache.org/jira/browse/HDFS-9701
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>         Attachments: HDFS-9701.01.patch, HDFS-9701.02.patch, HDFS-9701.03.patch, HDFS-9701.04.patch
>
>
> If the DN is under load (new blocks being written), a hot-swap task by {{hdfs dfsadmin -reconfig}} may cause a dead lock.



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