janhoy opened a new pull request, #3937:
URL: https://github.com/apache/solr/pull/3937

   On Crave runs, about one failure per week.
   ```
   > Task :solr:core:wipeTaskTemp
   ERROR: The following test(s) have failed:
     - org.apache.solr.client.solrj.impl.LB2SolrClientTest.testTwoServers 
(:solr:solrj)
       Test history: 
   
https://develocity.apache.org/scans/tests?search.rootProjectNames=solr-root&tests.container=org.apache.solr.client.solrj.impl.LB2SolrClientTest&tests.test=testTwoServers
 
   
http://fucit.org/solr-jenkins-reports/history-trend-of-recent-failures.html#series/org.apache.solr.client.solrj.impl.LB2SolrClientTest.testTwoServers
       Test output: 
/tmp/src/solr/solr/solrj/build/test-results/test/outputs/OUTPUT-org.apache.solr.client.solrj.impl.LB2SolrClientTest.txt
       Reproduce with: ./gradlew :solr:solrj:test --tests 
"org.apache.solr.client.solrj.impl.LB2SolrClientTest.testTwoServers" 
"-Ptests.jvmargs=-XX:TieredStopAtLevel=1 
   -XX:+UseParallelGC -XX:ActiveProcessorCount=1 
-XX:ReservedCodeCacheSize=120m" -Ptests.seed=BFC8AC5F327E55CE 
-Ptests.timeoutSuite=600000! -Ptests.useSecurityManager=true 
   -Ptests.file.encoding=US-ASCII
   ```
   
   The failure did not reproduce locally even after beasting, which makes it 
likely to be a timing issue which may be more visible on the ultra-fast Crave 
hardware. The failure was analyzed by an AI and a possible fix (though not 
proven) is to add a small sleep between observing the new Jetty starting up 
(being added to liveNodes) and actually sending requests to it.


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