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From "Xiaobing Zhou (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11476) Fix NPE in FsDatasetImpl#checkAndUpdate
Date Thu, 02 Mar 2017 19:36:45 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15892853#comment-15892853
] 

Xiaobing Zhou commented on HDFS-11476:
--------------------------------------

Posted v1 to fix it. Thanks for reviews. [~arpitagarwal]

> Fix NPE in FsDatasetImpl#checkAndUpdate
> ---------------------------------------
>
>                 Key: HDFS-11476
>                 URL: https://issues.apache.org/jira/browse/HDFS-11476
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>            Reporter: Xiaobing Zhou
>            Assignee: Xiaobing Zhou
>         Attachments: HDFS-11476.000.patch, HDFS-11476.001.patch
>
>
> diskMetaFile can be null and passed to compareTo which dereferences it, causing NPE
> {code}
> // Compare generation stamp
>       if (memBlockInfo.getGenerationStamp() != diskGS) {
>         File memMetaFile = FsDatasetUtil.getMetaFile(diskFile, 
>             memBlockInfo.getGenerationStamp());
>         if (memMetaFile.exists()) {
>           if (memMetaFile.compareTo(diskMetaFile) != 0) {
>             LOG.warn("Metadata file in memory "
>                 + memMetaFile.getAbsolutePath()
>                 + " does not match file found by scan "
>                 + (diskMetaFile == null? null: diskMetaFile.getAbsolutePath()));
>           }
>         } else {
> {code}



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