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Date: Tue, 4 Mar 2008 11:53:40 -0800 (PST)
From: "dhruba borthakur (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-2934) NPE while loading  FSImage
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     [ https://issues.apache.org/jira/browse/HADOOP-2934?page=3Dcom.atlassi=
an.jira.plugin.system.issuetabpanels:all-tabpanel ]

dhruba borthakur updated HADOOP-2934:
-------------------------------------

    Attachment: NPE_FSImage.patch

There is another place in FSImage.java that was dereferencing a DatanodeDes=
criptor reference without allocating the object.

> NPE while loading  FSImage
> --------------------------
>
>                 Key: HADOOP-2934
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2934
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.17.0
>            Reporter: Raghu Angadi
>            Assignee: dhruba borthakur
>         Attachments: NPE_FSImage.patch, NPE_FSImage.patch, NPE_FSImage.pa=
tch
>
>
> Andr=C3=A9 Martin reported on core-user mailing list :
> {noformat}=20
> [...]
> 2008-03-02 01:25:29,887 ERROR org.apache.hadoop.dfs.NameNode: java.lang.N=
ullPointerException
>     at org.apache.hadoop.dfs.FSImage.readINodeUnderConstruction(FSImage.j=
ava:950)
>     at org.apache.hadoop.dfs.FSImage.loadFilesUnderConstruction(FSImage.j=
ava:919)
>     at org.apache.hadoop.dfs.FSImage.loadFSImage(FSImage.java:749)
>     at org.apache.hadoop.dfs.FSImage.loadFSImage(FSImage.java:634)
>     at org.apache.hadoop.dfs.FSImage.recoverTransitionRead(FSImage.java:2=
23)
>     at org.apache.hadoop.dfs.FSDirectory.loadFSImage(FSDirectory.java:79)
>     at org.apache.hadoop.dfs.FSNamesystem.initialize(FSNamesystem.java:26=
1)
>     at org.apache.hadoop.dfs.FSNamesystem.<init>(FSNamesystem.java:242)
>     at org.apache.hadoop.dfs.NameNode.initialize(NameNode.java:131)
>     at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:176)
>     at org.apache.hadoop.dfs.NameNode.<init>(NameNode.java:162)
>     at org.apache.hadoop.dfs.NameNode.createNameNode(NameNode.java:851)
>     at org.apache.hadoop.dfs.NameNode.main(NameNode.java:860)
> {noformat}
> Block object should be allocated before calling {{readFields()}} in FSIma=
ge.java : {code}
> BlockInfo[] blocks =3D new BlockInfo[numBlocks];
> for (int i =3D 0; i < numBlocks; i++) {
>   blocks[i].readFields(in);
> }
> {code}

--=20
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