[jira] [Created] (HDFS-5433) When reloading fsimage during checkpointing, we should clear existing snapshottable directories

["Aaron T. Myers (JIRA)" <ji...@apache.org>]

Aaron T. Myers created HDFS-5433:
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             Summary: When reloading fsimage during checkpointing, we should clear existing snapshottable directories
                 Key: HDFS-5433
                 URL: https://issues.apache.org/jira/browse/HDFS-5433
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: snapshots
    Affects Versions: 2.2.0
            Reporter: Aaron T. Myers
            Assignee: Aaron T. Myers
            Priority: Critical


The complete set of snapshottable directories are referenced both via the file system tree and in the SnapshotManager class. It's possible that when the 2NN performs a checkpoint, it will reload its in-memory state based on a new fsimage from the NN, but will not clear the set of snapshottable directories referenced by the SnapshotManager. In this case, the 2NN will write out an fsimage that cannot be loaded, since the integer written to the fsimage indicating the number of snapshottable directories will be out of sync with the actual number of snapshottable directories serialized to the fsimage.

This is basically the same as HDFS-3835, but for snapshottable directories instead of delegation tokens.



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