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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-7728) ConcurrentModificationException after upgrade to trunk
Date Thu, 18 Sep 2014 20:00:34 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-7728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Benedict resolved CASSANDRA-7728.
---------------------------------
    Resolution: Duplicate

> ConcurrentModificationException after upgrade to trunk
> ------------------------------------------------------
>
>                 Key: CASSANDRA-7728
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7728
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Russ Hatch
>
> Trying to repro another issue, I ran across this exception. It occurred during a rolling
upgrade to trunk. It happening during or right after the test script checks counters to see
if they are correct.
> {noformat}
> ERROR [Thrift:2] 2014-08-11 13:47:09,668 CustomTThreadPoolServer.java:219 - Error occurred
during processing of message.
> java.util.ConcurrentModificationException: null
> 	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859) ~[na:1.7.0_65]
> 	at java.util.ArrayList$Itr.next(ArrayList.java:831) ~[na:1.7.0_65]
> 	at org.apache.cassandra.service.RowDigestResolver.getData(RowDigestResolver.java:40)
~[main/:na]
> 	at org.apache.cassandra.service.RowDigestResolver.getData(RowDigestResolver.java:28)
~[main/:na]
> 	at org.apache.cassandra.service.ReadCallback.get(ReadCallback.java:110) ~[main/:na]
> 	at org.apache.cassandra.service.AbstractReadExecutor.get(AbstractReadExecutor.java:144)
~[main/:na]
> 	at org.apache.cassandra.service.StorageProxy.fetchRows(StorageProxy.java:1262) ~[main/:na]
> 	at org.apache.cassandra.service.StorageProxy.read(StorageProxy.java:1188) ~[main/:na]
> 	at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:256)
~[main/:na]
> 	at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:212)
~[main/:na]
> 	at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:61)
~[main/:na]
> 	at org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:186)
~[main/:na]
> 	at org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:205) ~[main/:na]
> 	at org.apache.cassandra.thrift.CassandraServer.execute_cql3_query(CassandraServer.java:1916)
~[main/:na]
> 	at org.apache.cassandra.thrift.Cassandra$Processor$execute_cql3_query.getResult(Cassandra.java:4588)
~[thrift/:na]
> 	at org.apache.cassandra.thrift.Cassandra$Processor$execute_cql3_query.getResult(Cassandra.java:4572)
~[thrift/:na]
> 	at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39) ~[libthrift-0.9.1.jar:0.9.1]
> 	at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39) ~[libthrift-0.9.1.jar:0.9.1]
> 	at org.apache.cassandra.thrift.CustomTThreadPoolServer$WorkerProcess.run(CustomTThreadPoolServer.java:201)
~[main/:na]
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_65]
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_65]
> 	at java.lang.Thread.run(Thread.java:745) [na:1.7.0_65]
> {noformat}
> It's not happening 100% of the time, but may be triggered by running this dtest:
> {noformat}
> nosetests -vs upgrade_through_versions_test.py:TestUpgradeThroughVersions.upgrade_test_mixed
> {noformat}



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