Simon Willnauer created LUCENE-9408:
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             Summary: OneMerge#mergeFinish is called multiple times
                 Key: LUCENE-9408
                 URL: https://issues.apache.org/jira/browse/LUCENE-9408
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Simon Willnauer


After enforcing calling this method only once a random test caused 
OneMerge#mergeFinished to be called multiple times.

{noformat}
21:06:59    [junit4] Suite: org.apache.lucene.index.TestIndexFileDeleter
21:06:59    [junit4]   2> NOTE: reproduce with: ant test  
-Dtestcase=TestIndexFileDeleter -Dtests.method=testExcInDeleteFile 
-Dtests.seed=BCFF67862FF6529B -Dtests.slow=true -Dtests.badapples=true 
-Dtests.locale=haw-US -Dtests.timezone=Etc/Zulu -Dtests.asserts=true 
-Dtests.file.encoding=ISO-8859-1
21:06:59    [junit4] FAILURE 0.04s J0 | 
TestIndexFileDeleter.testExcInDeleteFile <<<
21:06:59    [junit4]    > Throwable #1: java.lang.AssertionError
21:06:59    [junit4]    >       at 
__randomizedtesting.SeedInfo.seed([BCFF67862FF6529B:518F81E5ACB0444E]:0)
21:06:59    [junit4]    >       at 
org.apache.lucene.index.TestIndexFileDeleter.testExcInDeleteFile(TestIndexFileDeleter.java:525)
21:06:59    [junit4]    >       at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
21:06:59    [junit4]    >       at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
21:06:59    [junit4]    >       at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
21:06:59    [junit4]    >       at 
java.base/java.lang.reflect.Method.invoke(Method.java:566)
21:06:59    [junit4]    >       at 
java.base/java.lang.Thread.run(Thread.java:834)
{noformat}

mergeFinished should only be called once.



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