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From "Todd Lipcon (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-2626) HA: BPOfferService.verifyAndSetNamespaceInfo needs to be synchronized
Date Mon, 05 Dec 2011 06:37:40 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2626?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon resolved HDFS-2626.
-------------------------------

       Resolution: Fixed
    Fix Version/s: HA branch (HDFS-1623)
     Hadoop Flags: Reviewed

Committed to branch, thanks for the review.
                
> HA: BPOfferService.verifyAndSetNamespaceInfo needs to be synchronized
> ---------------------------------------------------------------------
>
>                 Key: HDFS-2626
>                 URL: https://issues.apache.org/jira/browse/HDFS-2626
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: HA branch (HDFS-1623)
>
>         Attachments: hdfs-2626.txt
>
>
> When starting an HA blockpool with both namenodes up, I often see an NPE, referenced
by one of the TODOs. The issue is the following interleaving:
> - first BPActor registers, and sets bpNSInfo in BPOfferService. It then proceeds to initFsDataset
which takes a little bit of time
> - second BPActor registers, and sees bpNSInfo is non-null, then proceeds to heartbeat
loop. Meanwhile BPActor 1 is still initting FSDataset
> - second BPActor gets an NPE on first heartbeat since fsdataset is still null.
> We just need to synchronize that function to fix the NPE.

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