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From "Andy Isaacson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3048) Small race in BlockManager#close
Date Wed, 15 Aug 2012 01:57:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13434737#comment-13434737
] 

Andy Isaacson commented on HDFS-3048:
-------------------------------------

The test failure in TestWebHdfsWithMultipleNameNodes seems like it might be related. I'll
loop it locally and see if I can reproduce.
                
> Small race in BlockManager#close
> --------------------------------
>
>                 Key: HDFS-3048
>                 URL: https://issues.apache.org/jira/browse/HDFS-3048
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 2.0.0-alpha
>            Reporter: Eli Collins
>            Assignee: Andy Isaacson
>         Attachments: hdfs-3048.txt, hdfs-3787-2.txt
>
>
> There's a small race in BlockManager#close, we close the BlocksMap before the replication
monitor, which means the replication monitor can NPE if it tries to access the blocks map.
We need to swap the order (close the blocks map after shutting down the repl monitor).

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