Create or Append mode determined before obtaining write lock
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Key: LUCENE-3365
URL: https://issues.apache.org/jira/browse/LUCENE-3365
Project: Lucene - Java
Issue Type: Bug
Components: core/index
Affects Versions: 3.3, 3.2, 3.1
Reporter: Geoff Cooney
Priority: Minor
If an IndexWriter("writer1") is opened in CREATE_OR_APPEND mode, it determines
whether to CREATE or APPEND before obtaining the write lock. When another
IndexWriter("writer2") is in the process of creating the index, this can result
in writer1 entering create mode and then waiting to obtain the lock. When
writer2 commits and releases the lock, writer1 is already in create mode and
overwrites the index created by write2.
This bug was probably effected by LUCENE-2386 as prior to that Lucene generated
an empty commit when a new index was created. I think the issue could still
have occurred prior to that but the two IndexWriters would have needed to be
opened nearly simultaneously and the first IndexWriter would need to release
the lock before the second timed out.
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