[jira] [Created] (SOLR-12905) reproducible MultiSolrCloudTestCaseTest test failure

["Christine Poerschke (JIRA)" <ji...@apache.org>]

Christine Poerschke created SOLR-12905:
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             Summary: reproducible MultiSolrCloudTestCaseTest test failure
                 Key: SOLR-12905
                 URL: https://issues.apache.org/jira/browse/SOLR-12905
             Project: Solr
          Issue Type: Test
            Reporter: Christine Poerschke
            Assignee: Christine Poerschke


We've seen a few of these in Jenkins via the dev list https://lists.apache.org/list.html?dev@lucene.apache.org:lte=1y:%22duplicate%20clusterId%22 e.g.
{code}
FAILED: junit.framework.TestSuite.org.apache.solr.cloud.MultiSolrCloudTestCaseTest  Error Message: duplicate clusterId cloud1  Stack Trace: java.lang.AssertionError: duplicate clusterId cloud1 at __randomizedtesting.SeedInfo.seed([6DADDAF691F08EF7]:0) at org.junit.Assert.fail(Assert.java:93) at org.junit.Assert.assertTrue(Assert.java:43) at org.junit.Assert.assertFalse(Assert.java:68) at org.apache.solr.cloud.MultiSolrCloudTestCase.doSetupClusters(MultiSolrCloudTestCase.java:93) at org.apache.solr.cloud.MultiSolrCloudTestCaseTest.setupClusters(MultiSolrCloudTestCaseTest.java:53)
...
{code}

With a big of digging I was able to reliably reproduce it by using {{-Dtests.dups=N}} (which normally runs in multiple JVMs in parallel) together with {{-Dtests.jvms=1}} constraint so that the tests actually run sequentially in one JVM i.e. altogether

{code}
ant test -Dtests.dups=10 -Dtests.jvms=1 -Dtestcase=MultiSolrCloudTestCaseTest
{code}

The fix is simple i.e. the static {{clusterId2collection}} variable needs to be cleared in @AfterClass as someone ([~janhoy] ?) already mentioned somewhere elsewhere I think.




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