Xiaobing Zhou created HDFS-11476:
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Summary: Fix NPE in FsDatasetImpl#checkAndUpdate
Key: HDFS-11476
URL: https://issues.apache.org/jira/browse/HDFS-11476
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Xiaobing Zhou
Assignee: Xiaobing Zhou
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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