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https://issues.apache.org/jira/browse/HDFS-11476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15893335#comment-15893335
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Xiaobing Zhou commented on HDFS-11476:
--------------------------------------
v2 fixed the check style issues.
> 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,
> HDFS-11476.002.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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