IW.getReader() returns inconsistent reader on RT Branch
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Key: LUCENE-3028
URL: https://issues.apache.org/jira/browse/LUCENE-3028
Project: Lucene - Java
Issue Type: Bug
Components: Index
Affects Versions: Realtime Branch
Reporter: Simon Willnauer
Assignee: Simon Willnauer
Fix For: Realtime Branch
I extended the testcase TestRollingUpdates#testUpdateSameDoc to pull a NRT
reader after each update and asserted that is always sees only one document.
Yet, this fails with current branch since there is a problem in how we flush in
the getReader() case. What happens here is that we flush all threads and then
release the lock (letting other flushes which came in after we entered the
flushAllThread context, continue) so that we could concurrently get a new
segment that transports global deletes without the corresponding add. They
sneak in while we continue to open the NRT reader which in turn sees
inconsistent results.
I will upload a patch soon
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