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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9406) FSImage may get corrupted after deleting snapshot
Date Mon, 01 Feb 2016 23:49:40 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9406?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yongjun Zhang updated HDFS-9406:
--------------------------------
    Fix Version/s: 2.8.0

> FSImage may get corrupted after deleting snapshot
> -------------------------------------------------
>
>                 Key: HDFS-9406
>                 URL: https://issues.apache.org/jira/browse/HDFS-9406
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.6.0
>         Environment: CentOS 6 amd64, CDH 5.4.4-1
> 2xCPU: Intel(R) Xeon(R) CPU E5-2640 v3
> Memory: 32GB
> Namenode blocks: ~700_000 blocks, no HA setup
>            Reporter: Stanislav Antic
>            Assignee: Yongjun Zhang
>             Fix For: 2.8.0, 2.7.3
>
>         Attachments: HDFS-9406.001.patch, HDFS-9406.002.patch, HDFS-9406.003.patch, HDFS-9406.branch-2.7.patch
>
>
> FSImage corruption happened after HDFS snapshots were taken. Cluster was not used
> at that time.
> When namenode restarts it reported NULL pointer exception:
> {code}
> 15/11/07 10:01:15 INFO namenode.FileJournalManager: Recovering unfinalized segments in
/tmp/fsimage_checker_5857/fsimage/current
> 15/11/07 10:01:15 INFO namenode.FSImage: No edit log streams selected.
> 15/11/07 10:01:18 INFO namenode.FSImageFormatPBINode: Loading 1370277 INodes.
> 15/11/07 10:01:27 ERROR namenode.NameNode: Failed to start namenode.
> java.lang.NullPointerException
>         at org.apache.hadoop.hdfs.server.namenode.INodeDirectory.addChild(INodeDirectory.java:531)
>         at org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode$Loader.addToParent(FSImageFormatPBINode.java:252)
>         at org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode$Loader.loadINodeDirectorySection(FSImageFormatPBINode.java:202)
>         at org.apache.hadoop.hdfs.server.namenode.FSImageFormatProtobuf$Loader.loadInternal(FSImageFormatProtobuf.java:261)
>         at org.apache.hadoop.hdfs.server.namenode.FSImageFormatProtobuf$Loader.load(FSImageFormatProtobuf.java:180)
>         at org.apache.hadoop.hdfs.server.namenode.FSImageFormat$LoaderDelegator.load(FSImageFormat.java:226)
>         at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:929)
>         at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:913)
>         at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImageFile(FSImage.java:732)
>         at org.apache.hadoop.hdfs.server.namenode.FSImage.loadFSImage(FSImage.java:668)
>         at org.apache.hadoop.hdfs.server.namenode.FSImage.recoverTransitionRead(FSImage.java:281)
>         at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFSImage(FSNamesystem.java:1061)
>         at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.loadFromDisk(FSNamesystem.java:765)
>         at org.apache.hadoop.hdfs.server.namenode.NameNode.loadNamesystem(NameNode.java:584)
>         at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:643)
>         at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:810)
>         at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:794)
>         at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1487)
>         at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1553)
> 15/11/07 10:01:27 INFO util.ExitUtil: Exiting with status 1
> {code}
> Corruption happened after "07.11.2015 00:15", and after that time blocks ~9300 blocks
were invalidated that shouldn't be.
> After recovering FSimage I discovered that around ~9300 blocks were missing.
> -I also attached log of namenode before and after corruption happened.-



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