[ 
https://issues.apache.org/jira/browse/HDFS-15590?focusedWorklogId=490055&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-490055
 ]

ASF GitHub Bot logged work on HDFS-15590:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 24/Sep/20 08:31
            Start Date: 24/Sep/20 08:31
    Worklog Time Spent: 10m 
      Work Description: bshashikant commented on pull request #2326:
URL: https://github.com/apache/hadoop/pull/2326#issuecomment-698199742


   Thanks @szetszwo for the review. I have committed this.


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 490055)
    Time Spent: 1h 20m  (was: 1h 10m)

> namenode fails to start when ordered snapshot deletion feature is disabled
> --------------------------------------------------------------------------
>
>                 Key: HDFS-15590
>                 URL: https://issues.apache.org/jira/browse/HDFS-15590
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: snapshots
>            Reporter: Nilotpal Nandi
>            Assignee: Shashikant Banerjee
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.4.0
>
>          Time Spent: 1h 20m
>  Remaining Estimate: 0h
>
> {code:java}
> 1. Enabled ordered deletion snapshot feature.
> 2. Created snapshottable directory - /user/hrt_6/atrr_dir1
> 3. Created snapshots s0, s1, s2.
> 4. Deleted snapshot s2
> 5. Delete snapshot s0, s1, s2 again
> 6. Disable ordered deletion snapshot feature
> 5. Restart Namenode
> Failed to start namenode.
> org.apache.hadoop.hdfs.protocol.SnapshotException: Cannot delete snapshot s2 
> from path /user/hrt_6/atrr_dir2: the snapshot does not exist.
>       at 
> org.apache.hadoop.hdfs.server.namenode.snapshot.DirectorySnapshottableFeature.removeSnapshot(DirectorySnapshottableFeature.java:237)
>       at 
> org.apache.hadoop.hdfs.server.namenode.INodeDirectory.removeSnapshot(INodeDirectory.java:293)
>       at 
> org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotManager.deleteSnapshot(SnapshotManager.java:510)
>       at 
> org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.applyEditLogOp(FSEditLogLoader.java:819)
>       at 
> org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadEditRecords(FSEditLogLoader.java:287)
>       at 
> org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.loadFSEdits(FSEditLogLoader.java:182)
>       at 
> org.apache.hadoop.hdfs.server.namenode.FSImage.loadEdits(FSImage.java:912)
>       at 
> org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:760)
>       at 
> org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:337)
>       at 
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:1164)
>       at 
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:755)
>       at 
> org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:646)
>       at 
> org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:717)
>       at 
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:960)
>       at 
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:933)
>       at 
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1670)
>       at 
> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1737)
> {code}



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