I’m pretty sure this has nothing to do with the upgrade to ZK since it’s a 
Lucene test case, but I ran across this and this hasn’t failed in Chris’ 
rollups going back to last March so I thought people might want to see it. I 
have the full test log if anyone’s interested

   [junit4] Suite: 
org.apache.lucene.classification.CachingNaiveBayesClassifierTest
   [junit4]   2> NOTE: reproduce with: ant test  
-Dtestcase=CachingNaiveBayesClassifierTest -Dtests.method=testPerformance 
-Dtests.seed=A9F7A8BCC21AFCBA -Dtests.slow=true -Dtests.badapples=true 
-Dtests.locale=sq-AL -Dtests.timezone=America/Port-au-Prince 
-Dtests.asserts=true -Dtests.file.encoding=UTF-8
   [junit4] ERROR   5.10s J3 | CachingNaiveBayesClassifierTest.testPerformance 
<<<
   [junit4]    > Throwable #1: java.lang.RuntimeException: 
java.util.concurrent.ExecutionException: java.lang.AssertionError
   [junit4]    >        at 
__randomizedtesting.SeedInfo.seed([A9F7A8BCC21AFCBA:6E165A9EA9AEC415]:0)
   [junit4]    >        at 
org.apache.lucene.classification.utils.ConfusionMatrixGenerator.getConfusionMatrix(ConfusionMatrixGenerator.java:131)
   [junit4]    >        at 
org.apache.lucene.classification.CachingNaiveBayesClassifierTest.testPerformance(CachingNaiveBayesClassifierTest.java:101)
   [junit4]    >        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   [junit4]    >        at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
   [junit4]    >        at 
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   [junit4]    >        at 
java.base/java.lang.reflect.Method.invoke(Method.java:566)
   [junit4]    >        at java.base/java.lang.Thread.run(Thread.java:834)
   [junit4]    > Caused by: java.util.concurrent.ExecutionException: 
java.lang.AssertionError
   [junit4]    >        at 
java.base/java.util.concurrent.FutureTask.report(FutureTask.java:122)
   [junit4]    >        at 
java.base/java.util.concurrent.FutureTask.get(FutureTask.java:205)
   [junit4]    >        at 
org.apache.lucene.classification.utils.ConfusionMatrixGenerator.getConfusionMatrix(ConfusionMatrixGenerator.java:94)
   [junit4]    >        ... 36 more
   [junit4]    > Caused by: java.lang.AssertionError
   [junit4]    >        at 
java.base/java.util.HashMap$TreeNode.moveRootToFront(HashMap.java:1896)
   [junit4]    >        at 
java.base/java.util.HashMap$TreeNode.putTreeVal(HashMap.java:2061)
   [junit4]    >        at java.base/java.util.HashMap.putVal(HashMap.java:633)
   [junit4]    >        at 
java.base/java.util.HashMap.putIfAbsent(HashMap.java:1057)
   [junit4]    >        at 
org.apache.lucene.search.LRUQueryCache.putIfAbsent(LRUQueryCache.java:301)
   [junit4]    >        at 
org.apache.lucene.search.LRUQueryCache$CachingWrapperWeight.scorerSupplier(LRUQueryCache.java:745)
   [junit4]    >        at 
org.apache.lucene.search.BooleanWeight.scorerSupplier(BooleanWeight.java:361)
   [junit4]    >        at 
org.apache.lucene.search.BooleanWeight.scorer(BooleanWeight.java:327)
   [junit4]    >        at 
org.apache.lucene.search.Weight.bulkScorer(Weight.java:168)
   [junit4]    >        at 
org.apache.lucene.search.BooleanWeight.bulkScorer(BooleanWeight.java:321)
   [junit4]    >        at 
org.apache.lucene.search.LRUQueryCache$CachingWrapperWeight.cache(LRUQueryCache.java:693)
   [junit4]    >        at 
org.apache.lucene.search.LRUQueryCache$CachingWrapperWeight.bulkScorer(LRUQueryCache.java:825)
   [junit4]    >        at 
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:700)
   [junit4]    >        at 
org.apache.lucene.search.IndexSearcher.search(IndexSearcher.java:494)
   [junit4]    >        at 
org.apache.lucene.classification.CachingNaiveBayesClassifier.getWordFreqForClassess(CachingNaiveBayesClassifier.java:170)
   [junit4]    >        at 
org.apache.lucene.classification.CachingNaiveBayesClassifier.calculateLogLikelihood(CachingNaiveBayesClassifier.java:100)
   [junit4]    >        at 
org.apache.lucene.classification.CachingNaiveBayesClassifier.assignClassNormalizedList(CachingNaiveBayesClassifier.java:83)
   [junit4]    >        at 
org.apache.lucene.classification.SimpleNaiveBayesClassifier.assignClass(SimpleNaiveBayesClassifier.java:103)
   [junit4]    >        at 
org.apache.lucene.classification.utils.ConfusionMatrixGenerator.lambda$getConfusionMatrix$0(ConfusionMatrixGenerator.java:94)
   [junit4]    >        at 
java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
   [junit4]    >        at 
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
   [junit4]    >        at 
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
   [junit4]    >        ... 1 more
   [junit4]   2> NOTE: test params are: codec=Asserting(Lucene80), 
sim=Asserting(org.apache.lucene.search.similarities.AssertingSimilarity@54e63753),
 locale=sq-AL, timezone=America/Port-au-Prince
   [junit4]   2> NOTE: Mac OS X 10.14.5 x86_64/Oracle Corporation 11.0.2 
(64-bit)/cpus=12,threads=1,free=345936896,total=536870912
   [junit4]   2> NOTE: All tests run in this JVM: 
[ConfusionMatrixGeneratorTest, CachingNaiveBayesClassifierTest]
   [junit4] Completed [6/12 (1!)] on J3 in 6.65s, 4 tests, 1 error <<< FAILURES!
   [junit4] 
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