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HDFS-11476. Fix NPE in FsDatasetImpl#checkAndUpdate. Contributed by Xiaobing Zhou. 

(cherry picked from commit ac5ae0065a)
This commit is contained in:
Jing Zhao 2017-03-03 13:31:20 -08:00
parent 303ee13e3c
commit 30b43a2d4e
1 changed files with 7 additions and 5 deletions
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12
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java
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@ -2450,11 +2450,13 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> {
File memMetaFile = FsDatasetUtil.getMetaFile(diskFile, File memMetaFile = FsDatasetUtil.getMetaFile(diskFile,
memBlockInfo.getGenerationStamp()); memBlockInfo.getGenerationStamp());
if (fileIoProvider.exists(vol, memMetaFile)) { if (fileIoProvider.exists(vol, memMetaFile)) {
if (memMetaFile.compareTo(diskMetaFile) != 0) { String warningPrefix = "Metadata file in memory "
LOG.warn("Metadata file in memory " + memMetaFile.getAbsolutePath()
+ memMetaFile.getAbsolutePath() + " does not match file found by scan ";
+ " does not match file found by scan " if (!diskMetaFileExists) {
+ (diskMetaFile == null? null: diskMetaFile.getAbsolutePath())); LOG.warn(warningPrefix + "null");
} else if (memMetaFile.compareTo(diskMetaFile) != 0) {
LOG.warn(warningPrefix + diskMetaFile.getAbsolutePath());
} }
} else { } else {
// Metadata file corresponding to block in memory is missing // Metadata file corresponding to block in memory is missing