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  1. Hadoop HDFS
  2. HDFS-1623 High Availability Framework for HDFS NN
  3. HDFS-2626

HA: BPOfferService.verifyAndSetNamespaceInfo needs to be synchronized

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    Details

    • Type: Sub-task
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: HA branch (HDFS-1623)
    • Component/s: datanode, ha
    • Labels:
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      Description

      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.

        Attachments

        1. hdfs-2626.txt
          2 kB
          Todd Lipcon

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            • Assignee:
              tlipcon Todd Lipcon
              Reporter:
              tlipcon Todd Lipcon
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              Dates

              • Created:
                Updated:
                Resolved: