[LUCENE-3520] If the NRT reader hasn't changed then IndexReader.openIfChanged should return null

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.5, 4.0-ALPHA
• Component/s: core/index
• Lucene Fields: New
• Assignee: Michael McCandless
• Reporter: Michael McCandless
• Created: 15/Oct/11 14:40
• Updated: 28/Aug/22 12:59
• Resolved: 16/Oct/11 17:56

Description

I hit a failure in TestSearcherManager (NOTE: doesn't always fail):

  ant test -Dtestcase=TestSearcherManager -Dtestmethod=testSearcherManager -Dtests.seed=459ac99a4256789c:-29b8a7f52497c3b4:145ae632ae9e1ecf

It was tripping the assert inside SearcherLifetimeManager.record,
because two different IndexSearcher instances had different IR
instances sharing the same version. This was happening because
IW.getReader always returns a new reader even when there are no
changes. I think we should fix that...

Separately I found a deadlock in
TestSearcherManager.testIntermediateClose, if the test gets
SerialMergeScheduler and needs to merge during the second commit.