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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3048) Small race in BlockManager#close
Date Mon, 05 Mar 2012 20:42:05 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222595#comment-13222595
] 

Todd Lipcon commented on HDFS-3048:
-----------------------------------

I think you'd need to do a join() on the replication manager, otherwise there's still potentially
a race, right? I seem to remember trying to fix this once, but ran into a deadlock issue with
the join() call.
                
> 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: 0.23.2
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hdfs-3048.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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