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From "Todd Lipcon (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2626) HA: BPOfferService.verifyAndSetNamespaceInfo needs to be synchronized
Date Sat, 03 Dec 2011 01:15:40 GMT
HA: BPOfferService.verifyAndSetNamespaceInfo needs to be synchronized
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                 Key: HDFS-2626
                 URL: https://issues.apache.org/jira/browse/HDFS-2626
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Todd Lipcon
         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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