[HDFS-5427] not able to read deleted files from snapshot directly under snapshottable dir after checkpoint and NN restart

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.0, 3.0.0-alpha1
• Fix Version/s: 2.3.0
• Component/s: snapshots
• Target Version/s: 2.3.0
• Hadoop Flags: Reviewed
• Assignee: Vinayakumar B
• Reporter: Vinayakumar B
• Created: 25/Oct/13 10:53
• Updated: 12/May/16 18:13
• Resolved: 05/Nov/13 06:48

Description

1. allow snapshots under dir /foo
2. create a file /foo/bar
3. create a snapshot s1 under /foo
4. delete the file /foo/bar
5. wait till checkpoint or do saveNameSpace
6. restart NN.
7. Now try to read the file from snapshot /foo/.snapshot/s1/bar

client will get BlockMissingException

Reason is
While loading the deleted file list for a snashottable dir from fsimage, blocks were not updated in blocksmap