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https://issues.apache.org/jira/browse/HDFS-12985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16342664#comment-16342664
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Wei-Chiu Chuang commented on HDFS-12985:
----------------------------------------

Hi [~yzhangal] thanks for the review. Would you please take a further look to 
see if the fix is applicable to 3.0.1, 2.8.x and older branches?

 

Thanks

> NameNode crashes during restart after an OpenForWrite file present in the 
> Snapshot got deleted
> ----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-12985
>                 URL: https://issues.apache.org/jira/browse/HDFS-12985
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs
>    Affects Versions: 2.8.0
>            Reporter: Manoj Govindassamy
>            Assignee: Manoj Govindassamy
>            Priority: Major
>             Fix For: 3.1.0, 2.10.0
>
>         Attachments: HDFS-12985.01.patch
>
>
> NameNode crashes repeatedly with NPE at the startup when trying to find the 
> total number of under construction blocks. This crash happens after an open 
> file, which was also part of a snapshot gets deleted along with the snapshot.
> {noformat}
> Failed to start namenode.
> java.lang.NullPointerException
>       at 
> org.apache.hadoop.hdfs.server.namenode.LeaseManager.getNumUnderConstructionBlocks(LeaseManager.java:146)
>       at 
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getCompleteBlocksTotal(FSNamesystem.java:6537)
>       at 
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startCommonServices(FSNamesystem.java:1232)
>       at 
> org.apache.hadoop.hdfs.server.namenode.NameNode.startCommonServices(NameNode.java:706)
>       at 
> org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:692)
>       at 
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:844)
>       at 
> org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:823)
>       at 
> org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1547)
>       at 
> org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1615)
> {noformat}



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