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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