Otis Gospodnetic wrote:
This was the ooooold behaviour in Lucene. You may want to check the ML archives to see why the lock was moved to temp dir by default, I remember there being some discussion around that. This might have been....2 years ago?
To answer my own question, I've just discovered that LOCK_DIR is public on FSDirectory, and that setting it to null makes it use the index directory as the means of storage.
My instant guess as to why it's not stored in the text index itself, is that it might have been done to support read-only text indexes. (Or perhaps not... a read-only directory doesn't have to worry so much about getting into inconsistencies. If you can't modify files, you can't cause conflicts.)
I've also discovered that Lucene is using createNewFile() to perform locking (the JavaDoc for said method says that it shouldn't be used for locking.) Luckily the makeLock() method is overridable so we could easily avoid that issue without modifying Lucene.
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