[ 
https://issues.apache.org/jira/browse/LUCENE-6957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15085524#comment-15085524
 ] 

Steve Rowe commented on LUCENE-6957:
------------------------------------

Looks like this change might be implicated in a reproducible fail found by 
Policeman Jenkins 
[http://jenkins.thetaphi.de/job/Lucene-Solr-trunk-Linux/15456/]?:

{noformat}
   [junit4] Suite: org.apache.lucene.search.suggest.TestInputIterator
   [junit4]   2> NOTE: reproduce with: ant test  -Dtestcase=TestInputIterator 
-Dtests.method=testTerms -Dtests.seed=69B1CC8C7D0DECB3 -Dtests.multiplier=3 
-Dtests.slow=true -Dtests.locale=sr_ME_#Latn 
-Dtests.timezone=Australia/Canberra -Dtests.asserts=true 
-Dtests.file.encoding=UTF-8
   [junit4] ERROR   0.57s J0 | TestInputIterator.testTerms <<<
   [junit4]    > Throwable #1: java.io.FileNotFoundException: 
sorted_input_0.tmp in dir=NRTCachingDirectory(RAMDirectory@2d9f5a20 
lockFactory=org.apache.lucene.store.SingleInstanceLockFactory@151e3d67; 
maxCacheMB=0.7294921875 maxMergeSizeMB=0.4765625)
   [junit4]    >        at 
__randomizedtesting.SeedInfo.seed([69B1CC8C7D0DECB3:C5033CBEB96632A1]:0)
   [junit4]    >        at 
org.apache.lucene.store.MockDirectoryWrapper.openInput(MockDirectoryWrapper.java:677)
   [junit4]    >        at 
org.apache.lucene.util.OfflineSorter.sort(OfflineSorter.java:240)
   [junit4]    >        at 
org.apache.lucene.search.suggest.SortedInputIterator.sort(SortedInputIterator.java:191)
   [junit4]    >        at 
org.apache.lucene.search.suggest.SortedInputIterator.<init>(SortedInputIterator.java:79)
   [junit4]    >        at 
org.apache.lucene.search.suggest.TestInputIterator.testTerms(TestInputIterator.java:85)
   [junit4]    >        at java.lang.Thread.run(Thread.java:745)
   [junit4]   2> NOTE: test params are: codec=Asserting(Lucene60): {}, 
docValues:{}, sim=RandomSimilarityProvider(queryNorm=true,coord=yes): {}, 
locale=sr_ME_#Latn, timezone=Australia/Canberra
   [junit4]   2> NOTE: Linux 3.19.0-42-generic amd64/Oracle Corporation 
1.8.0_66 (64-bit)/cpus=12,threads=1,free=383372608,total=508887040
   [junit4]   2> NOTE: All tests run in this JVM: [TestNGramDistance, 
TestSuggestField, DocumentDictionaryTest, TestLuceneDictionary, 
CompletionTokenStreamTest, TestSpellChecker, FSTCompletionTest, 
TestDirectSpellChecker, TestPlainTextDictionary, TestHighFrequencyDictionary, 
TestJaroWinklerDistance, TestInputIterator]
   [junit4] Completed [20/32 (1!)] on J0 in 0.58s, 2 tests, 1 error <<< 
FAILURES!
{noformat}

> NRTCachingDirectory is missing createTempOutput
> -----------------------------------------------
>
>                 Key: LUCENE-6957
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6957
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: Trunk
>
>         Attachments: LUCENE-6957.patch, LUCENE-6957.patch
>
>
> It's broken now because it simply delegates to the wrapped dir now,
> which can create an output that already exists in the ram dir cache.
> This bug only affects trunk (it's never been released).



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