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From "Paul taylor (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-3481) Building a second index on a FAT32 drive from OSX fails with OverlappingFileLockException
Date Sat, 01 Oct 2011 07:45:45 GMT
Building a second index on a FAT32 drive from OSX fails with OverlappingFileLockException
-----------------------------------------------------------------------------------------

                 Key: LUCENE-3481
                 URL: https://issues.apache.org/jira/browse/LUCENE-3481
             Project: Lucene - Java
          Issue Type: Bug
          Components: core/index
    Affects Versions: 3.1
         Environment: Mac OSX 10.7 Lion with attached FAT32 disc
            Reporter: Paul taylor


Building a new index using FSDirectory.open(new File(path) on a FAT32 drive from OSX. Once
the index has built but the index writer has not been closed because I want to optimize it
I create a new indexwriter to create a second completely different index. However this fails
with 

Exception in thread "main" java.nio.channels.OverlappingFileLockException
    at sun.nio.ch.FileChannelImpl$SharedFileLockTable.checkList(FileChannelImpl.java:1166)
    at sun.nio.ch.FileChannelImpl$SharedFileLockTable.add(FileChannelImpl.java:1068)
    at sun.nio.ch.FileChannelImpl.tryLock(FileChannelImpl.java:868)
    at java.nio.channels.FileChannel.tryLock(FileChannel.java:962)
    at org.apache.lucene.store.NativeFSLock.obtain(NativeFSLockFactory.java:216)
    at org.apache.lucene.store.Lock.obtain(Lock.java:72)
    at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:1097)  

but this should not occur as I am not locking the same file, this second index is being built
in a different directory albeit with the same parent directory as the other index.

I think the issue is specifically to do with OSX - FAT32 interaction because the problem always
occurs, but never occurs if I build the indexes on the internal Mac drive. 

The only way I could resolve this was to remove locking using 

FSDirectory.open(new File(path), NoLockFactory.getNoLockFactory() );

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