Also, what OS is this running under? This issue is related to filesystem locking behavior which is different between Unix and Windows.
We did disable lucene's file based locking mechanism since our app is not setup to allow multiple different JVM's to write to a single index (one index per JVM) and we've had no end of issues with the file based locking. This was done by just setting FSDirectory.DISABLE_LOCKS to true;
Are you reading the index from multiple JVMs? If so, you still need the lock files. Lock files can be disabled only (a) if the index is never modified; or (b) if it is only accessed from a single JVM. The latter case is probably not tested much, and I don't see any reason to rely on it.
Why are you disabling lock files anyway? Did you have problems with them? They don't have a performance impact, and serve to protect you from problems like this.
Doug
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