possible race condition in FSDataset.FSVolume
---------------------------------------------
Key: HADOOP-4130
URL: https://issues.apache.org/jira/browse/HADOOP-4130
Project: Hadoop Core
Issue Type: Bug
Components: fs
Affects Versions: 0.19.0
Reporter: Steve Loughran
Priority: Minor
This is only a possibility, noticed during reviewing of the possible causes of
HADOOP-4128.
In the FSDataset.FSVolume constructor, attempts are made to recover from the
detach and tmp directories
this.detachDir = new File(parent, "detach");
if (detachDir.exists()) {
recoverDetachedBlocks(currentDir, detachDir);
this.tmpDir = new File(parent, "tmp");
if (tmpDir.exists()) {
recoverDetachedBlocks(currentDir, tmpDir);
}
This is done before the destination directory is created
this.dataDir = new FSDir(currentDir);
If either ../detach or ../tmp had valid data, but ../current didn't exist,
recovery could fail without useful messages. Perhaps the existence of
../current is a prerequisite for recovery?
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