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https://issues.apache.org/jira/browse/HDFS-2626?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron T. Myers updated HDFS-2626:
---------------------------------
Component/s: ha
data-node
> 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
> Components: data-node, ha
> 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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