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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