[ 
https://issues.apache.org/jira/browse/LUCENE-4953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642762#comment-13642762
 ] 

Michael McCandless commented on LUCENE-4953:
--------------------------------------------

I feel like we are making the wrong tradeoff here: we are making our core code 
(ParallelAtomic/CompositeReader) more hairy because of a limitation/constraint 
from LuceneTestCase.newSearcher (that it's never allowed to incRef the reader).

I think instead we should fix that test limitation, and then use the original 
patch (where PCR incRefs the provided readers).

EG we can move the reader wrapping to places like RandomIndexWriter.newReader 
instead of newSearcher ...
                
> readerClosedListener is not invoked for ParallelCompositeReader's leaves
> ------------------------------------------------------------------------
>
>                 Key: LUCENE-4953
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4953
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Michael McCandless
>            Assignee: Uwe Schindler
>             Fix For: 5.0, 4.4
>
>         Attachments: LUCENE-4953.patch, LUCENE-4953.patch, LUCENE-4953.patch, 
> LUCENE-4953.patch
>
>
> There was a test failure last night:
> {noformat}
> 1 tests failed.
> REGRESSION:  
> org.apache.lucene.search.grouping.AllGroupHeadsCollectorTest.testBasic
> Error Message:
> testBasic(org.apache.lucene.search.grouping.AllGroupHeadsCollectorTest): 
> Insane FieldCache usage(s) found expected:<0> but was:<2>
> Stack Trace:
> java.lang.AssertionError: 
> testBasic(org.apache.lucene.search.grouping.AllGroupHeadsCollectorTest): 
> Insane FieldCache usage(s) found expected:<0> but was:<2>
>         at 
> __randomizedtesting.SeedInfo.seed([1F9C2A2AD23A8E02:B466373F0DE6082C]:0)
>         at org.junit.Assert.fail(Assert.java:93)
>         at org.junit.Assert.failNotEquals(Assert.java:647)
>         at org.junit.Assert.assertEquals(Assert.java:128)
>         at org.junit.Assert.assertEquals(Assert.java:472)
>         at 
> org.apache.lucene.util.LuceneTestCase.assertSaneFieldCaches(LuceneTestCase.java:592)
>         at 
> org.apache.lucene.util.TestRuleFieldCacheSanity$1.evaluate(TestRuleFieldCacheSanity.java:55)
>         at 
> org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:46)
>         at 
> com.carrotsearch.randomizedtesting.rules.SystemPropertiesInvariantRule$1.evaluate(SystemPropertiesInvariantRule.java:55)
>         at 
> org.apache.lucene.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:49)
>         at 
> org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:70)
>         at 
> org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:48)
>         at 
> com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
>         at 
> com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:358)
>         at 
> com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:782)
>         at 
> com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:442)
>         at 
> com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(RandomizedRunner.java:746)
>         at 
> com.carrotsearch.randomizedtesting.RandomizedRunner$3.evaluate(RandomizedRunner.java:648)
>         at 
> com.carrotsearch.randomizedtesting.RandomizedRunner$4.evaluate(RandomizedRunner.java:682)
>         at 
> com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:693)
>         at 
> org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:46)
>         at 
> org.apache.lucene.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:42)
>         at 
> com.carrotsearch.randomizedtesting.rules.SystemPropertiesInvariantRule$1.evaluate(SystemPropertiesInvariantRule.java:55)
>         at 
> com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:39)
>         at 
> com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:39)
>         at 
> com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
>         at 
> org.apache.lucene.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:43)
>         at 
> org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:48)
>         at 
> org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:70)
>         at 
> org.apache.lucene.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:55)
>         at 
> com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
>         at 
> com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:358)
>         at java.lang.Thread.run(Thread.java:722)
> Build Log:
> [...truncated 6904 lines...]
> [junit4:junit4] Suite: 
> org.apache.lucene.search.grouping.AllGroupHeadsCollectorTest
> [junit4:junit4]   2> *** BEGIN 
> testBasic(org.apache.lucene.search.grouping.AllGroupHeadsCollectorTest): 
> Insane FieldCache usage(s) ***
> [junit4:junit4]   2> VALUEMISMATCH: Multiple distinct value objects for 
> ParallelAtomicReader(_0(5.0):C3)+id
> [junit4:junit4]   2>    'ParallelAtomicReader(_0(5.0):C3)'=>'id',class 
> org.apache.lucene.index.SortedDocValues,0.5=>org.apache.lucene.search.FieldCacheImpl$SortedDocValuesImpl#386041791
>  (size =~ 232 bytes)
> [junit4:junit4]   2>    
> 'ParallelAtomicReader(_0(5.0):C3)'=>'id',int,org.apache.lucene.search.FieldCache.DEFAULT_INT_PARSER=>org.apache.lucene.search.FieldCacheImpl$IntsFromArray#140912913
>  (size =~ 48 bytes)
> [junit4:junit4]   2>    
> 'ParallelAtomicReader(_0(5.0):C3)'=>'id',int,null=>org.apache.lucene.search.FieldCacheImpl$IntsFromArray#140912913
>  (size =~ 48 bytes)
> [junit4:junit4]   2>
> [junit4:junit4]   2> VALUEMISMATCH: Multiple distinct value objects for 
> ParallelAtomicReader(_1(5.0):C5)+id
> [junit4:junit4]   2>    
> 'ParallelAtomicReader(_1(5.0):C5)'=>'id',int,null=>org.apache.lucene.search.FieldCacheImpl$IntsFromArray#1105632232
>  (size =~ 56 bytes)
> [junit4:junit4]   2>    
> 'ParallelAtomicReader(_1(5.0):C5)'=>'id',int,org.apache.lucene.search.FieldCache.DEFAULT_INT_PARSER=>org.apache.lucene.search.FieldCacheImpl$IntsFromArray#1105632232
>  (size =~ 56 bytes)
> [junit4:junit4]   2>    'ParallelAtomicReader(_1(5.0):C5)'=>'id',class 
> org.apache.lucene.index.SortedDocValues,0.5=>org.apache.lucene.search.FieldCacheImpl$SortedDocValuesImpl#27148040
>  (size =~ 232 bytes)
> [junit4:junit4]   2>
> [junit4:junit4]   2> *** END 
> testBasic(org.apache.lucene.search.grouping.AllGroupHeadsCollectorTest): 
> Insane FieldCache usage(s) ***
> [junit4:junit4]   2> NOTE: download the large Jenkins line-docs file by 
> running 'ant get-jenkins-line-docs' in the lucene directory.
> [junit4:junit4]   2> NOTE: reproduce with: ant test  
> -Dtestcase=AllGroupHeadsCollectorTest -Dtests.method=testBasic 
> -Dtests.seed=1F9C2A2AD23A8E02 -Dtests.multiplier=2 -Dtests.nightly=true 
> -Dtests.slow=true 
> -Dtests.linedocsfile=/home/hudson/lucene-data/enwiki.random.lines.txt 
> -Dtests.locale=be_BY -Dtests.timezone=Asia/Manila 
> -Dtests.file.encoding=US-ASCII
> [junit4:junit4] FAILURE 0.75s J1 | AllGroupHeadsCollectorTest.testBasic <<<
> [junit4:junit4]    > Throwable #1: java.lang.AssertionError: 
> testBasic(org.apache.lucene.search.grouping.AllGroupHeadsCollectorTest): 
> Insane FieldCache usage(s) found expected:<0> but was:<2>
> [junit4:junit4]    >    at 
> __randomizedtesting.SeedInfo.seed([1F9C2A2AD23A8E02:B466373F0DE6082C]:0)
> [junit4:junit4]    >    at 
> org.apache.lucene.util.LuceneTestCase.assertSaneFieldCaches(LuceneTestCase.java:592)
> [junit4:junit4]    >    at java.lang.Thread.run(Thread.java:722)
> [junit4:junit4]   2> NOTE: test params are: codec=Lucene42: 
> {sort3=MockFixedIntBlock(blockSize=733), id=Pulsing41(freqCutoff=3 
> minBlockSize=50 maxBlockSize=177), content=MockFixedIntBlock(blockSize=733), 
> author=Pulsing41(freqCutoff=3 minBlockSize=50 maxBlockSize=177), 
> sort2=MockVariableIntBlock(baseBlockSize=71), sort1=Pulsing41(freqCutoff=3 
> minBlockSize=50 maxBlockSize=177), group=Pulsing41(freqCutoff=3 
> minBlockSize=50 maxBlockSize=177)}, 
> docValues:{author_dv=DocValuesFormat(name=Disk), 
> group_dv=DocValuesFormat(name=Disk)}, 
> sim=RandomSimilarityProvider(queryNorm=false,coord=yes): {content=IB LL-L1, 
> author=DFR GBZ(0.3)}, locale=be_BY, timezone=Asia/Manila
> [junit4:junit4]   2> NOTE: FreeBSD 9.0-RELEASE amd64/Oracle Corporation 
> 1.7.0_17 (64-bit)/cpus=16,threads=1,free=157973280,total=249626624
> [junit4:junit4]   2> NOTE: All tests run in this JVM: 
> [GroupFacetCollectorTest, AllGroupsCollectorTest, AllGroupHeadsCollectorTest]
> {noformat}
> It reproduces, and happens because ParallelCompositeReader isn't invoking the 
> reader listeners on its .leaves() when everything is closed.  I made a 
> separate test case to show the issue ...

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