[SOLR-11821] ConcurrentModificationException in SimSolrCloudTestCase.tearDown

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 7.3, 8.0
• Component/s: AutoScaling, Tests
• Assignee: Shalin Shekhar Mangar
• Reporter: Shalin Shekhar Mangar
• Created: 05/Jan/18 09:07
• Updated: 02/Oct/19 17:24
• Resolved: 08/Jan/18 08:35

Description

I noticed a few test failures on jenkins such as the following:

FAILED:  org.apache.solr.cloud.autoscaling.sim.TestComputePlanAction.testNodeLost

Error Message:


Stack Trace:
java.util.ConcurrentModificationException
        at __randomizedtesting.SeedInfo.seed([A41248828EFF34E3:1B07867C0D155165]:0)
        at java.base/java.util.ArrayList$Itr.checkForComodification(ArrayList.java:937)
        at java.base/java.util.ArrayList$Itr.next(ArrayList.java:891)
        at org.apache.solr.cloud.autoscaling.sim.SimSolrCloudTestCase.tearDown(SimSolrCloudTestCase.java:141)

The line in question iterates over a synchronized List but synchronized list does not return a safe iterator.