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https://issues.apache.org/jira/browse/HDFS-15568?focusedWorklogId=481302&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-481302
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ASF GitHub Bot logged work on HDFS-15568:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 10/Sep/20 08:19
            Start Date: 10/Sep/20 08:19
    Worklog Time Spent: 10m 
      Work Description: bshashikant opened a new pull request #2296:
URL: https://github.com/apache/hadoop/pull/2296


   
   please see https://issues.apache.org/jira/browse/HDFS-15568
   


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

            Worklog Id:     (was: 481302)
    Remaining Estimate: 0h
            Time Spent: 10m

> namenode start failed to start when dfs.namenode.snapshot.max.limit set
> -----------------------------------------------------------------------
>
>                 Key: HDFS-15568
>                 URL: https://issues.apache.org/jira/browse/HDFS-15568
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: snapshots
>            Reporter: Nilotpal Nandi
>            Assignee: Shashikant Banerjee
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> {code:java}
> 11:35:05.872 AM       ERROR   NameNode        
> Failed to start namenode.
> org.apache.hadoop.hdfs.protocol.SnapshotException: Failed to add snapshot: 
> there are already 20 snapshot(s) and the max snapshot limit is 20
>       at 
> org.apache.hadoop.hdfs.server.namenode.snapshot.DirectorySnapshottableFeature.addSnapshot(DirectorySnapshottableFeature.java:181)
>       at 
> org.apache.hadoop.hdfs.server.namenode.INodeDirectory.addSnapshot(INodeDirectory.java:285)
>       at 
> org.apache.hadoop.hdfs.server.namenode.snapshot.SnapshotManager.createSnapshot(SnapshotManager.java:447)
>       at 
> org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.applyEditLogOp(FSEditLogLoader.java:802)
>       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}
> Steps to reproduce:
> ----------------------
> directory level snapshot limit set - 100
> Created 100 snapshots
> deleted all 100 snapshots (in-oder)
> No snapshot exist
> Then, directory level snapshot limit set - 20
> HDFS restart
> Namenode start failed.



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