[HADOOP-8589] ViewFs tests fail when tests and home dirs are nested

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.23.1, 2.0.0-alpha
• Fix Version/s: 2.0.3-alpha
• Component/s: fs, test
• Target Version/s: 0.23.5
• Hadoop Flags: Reviewed
• Assignee: Sanjay Radia
• Reporter: Andrey Klochkov
• Created: 11/Jul/12 23:27
• Updated: 03/Sep/14 23:11
• Resolved: 08/Nov/12 06:17

Description

TestFSMainOperationsLocalFileSystem fails in case when the test root directory is under the user's home directory, and the user's home dir is deeper than 2 levels from /. This happens with the default 1-node installation of Jenkins.

This is the failure log:

org.apache.hadoop.fs.FileAlreadyExistsException: Path /var already exists as dir; cannot create link here
	at org.apache.hadoop.fs.viewfs.InodeTree.createLink(InodeTree.java:244)
	at org.apache.hadoop.fs.viewfs.InodeTree.<init>(InodeTree.java:334)
	at org.apache.hadoop.fs.viewfs.ViewFileSystem$1.<init>(ViewFileSystem.java:167)
	at org.apache.hadoop.fs.viewfs.ViewFileSystem.initialize(ViewFileSystem.java:167)
	at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2094)
	at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:79)
	at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2128)
	at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2110)
	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:290)
	at org.apache.hadoop.fs.viewfs.ViewFileSystemTestSetup.setupForViewFileSystem(ViewFileSystemTestSetup.java:76)
	at org.apache.hadoop.fs.viewfs.TestFSMainOperationsLocalFileSystem.setUp(TestFSMainOperationsLocalFileSystem.java:40)

...

Standard Output
2012-07-11 22:07:20,239 INFO  mortbay.log (Slf4jLog.java:info(67)) - Home dir base /var/lib

The reason for the failure is that the code tries to mount links for both "/var" and "/var/lib", and it fails for the 2nd one as the "/var" is mounted already.

The fix was provided in HADOOP-8036 but later it was reverted in HADOOP-8129.

Issue Links

• relates to: HADOOP-8036 TestViewFsTrash assumes the user's home directory is 2 levels deep