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https://issues.apache.org/jira/browse/HDFS-15568?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shashikant Banerjee resolved HDFS-15568.
----------------------------------------
Fix Version/s: 3.4.0
Resolution: Fixed
> 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
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Time Spent: 3h 20m
> 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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