vigyasharma opened a new pull request, #1011:
URL: https://github.com/apache/lucene/pull/1011

   `TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler` fails with 
the following exception ([build 
job](https://jenkins.thetaphi.de/job/Lucene-main-Linux/35576/testReport/junit/org.apache.lucene/TestMergeSchedulerExternal/testSubclassConcurrentMergeScheduler/)):
   
   ```java
   java.lang.AssertionError
        at 
__randomizedtesting.SeedInfo.seed([DDD39440C0DA45D4:5A5229EDC4FA3FD0]:0)
        at org.junit.Assert.fail(Assert.java:87)
        at org.junit.Assert.assertTrue(Assert.java:42)
        at org.junit.Assert.assertTrue(Assert.java:53)
        at 
org.apache.lucene.TestMergeSchedulerExternal.testSubclassConcurrentMergeScheduler(TestMergeSchedulerExternal.java:149)
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        ...
        at 
com.carrotsearch.randomizedtesting.ThreadLeakControl.lambda$forkTimeoutingTask$0(ThreadLeakControl.java:850)
        at java.base/java.lang.Thread.run(Thread.java:833)
   ```
   
   I tried beasting this test but was unable to repro the error. Going by code, 
we may be hitting `writer.rollback()` too soon.
   
   An exception in `addDocument()`, would cause us to skip 
`getMergeScheduler().sync()` and directly invoke `writer.rollback()`. This 
*could* cause merge threads to start aborting before they hit the merge 
exception expected by this test. Since `MergeAbortedException` is not rethrown, 
it would not hit `mergeScheduler.handleMergeExceptions()`, and the `excCalled` 
flag would stay unset.
   


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