[ https://issues.apache.org/jira/browse/CASSANDRA-5382?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jason Reber updated CASSANDRA-5382: ----------------------------------- Summary: ConcurrentModificantionException on server when multiple CQL3 read requests received on single column family simultaneously. (was: ConcurrentModificantionException on server when multiple read CQL3 read requests recieved on single column family simultaneously.) > ConcurrentModificantionException on server when multiple CQL3 read requests > received on single column family simultaneously. > ---------------------------------------------------------------------------------------------------------------------------- > > Key: CASSANDRA-5382 > URL: https://issues.apache.org/jira/browse/CASSANDRA-5382 > Project: Cassandra > Issue Type: Bug > Affects Versions: 1.2.3 > Environment: SLES, Sun JDK 1.6.0_43 > Reporter: Jason Reber > Priority: Minor > > The exception below is thrown on the server when two reads are performed at > the exact same time on the same column family. This causes the query to fail. > The problem appears to be caused by the 'name' list in > org.apache.cassandra.cql3.ResultSet$Metadata. The reference is passed in to > the constructor and iterated without copying and without a synch block. When > two of these ResultSet instances are created from the same metadata list at > the same time, a ConcurrentModificationException is thrown. > The error: > ERROR [Thrift:860] 2013-03-25 09:27:39,467 CustomTThreadPoolServer.java (line > 217) Error occurred during processing of message. > java.util.ConcurrentModificationException > at > java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) > at java.util.AbstractList$Itr.next(AbstractList.java:343) > at > org.apache.cassandra.cql3.ResultSet$Metadata.allInSameCF(ResultSet.java:237) > at > org.apache.cassandra.cql3.ResultSet$Metadata.<init>(ResultSet.java:219) > at org.apache.cassandra.cql3.ResultSet.<init>(ResultSet.java:47) > at > org.apache.cassandra.cql3.statements.Selection$ResultSetBuilder.<init>(Selection.java:239) > at > org.apache.cassandra.cql3.statements.Selection$ResultSetBuilder.<init>(Selection.java:221) > at > org.apache.cassandra.cql3.statements.Selection.resultSetBuilder(Selection.java:211) > at > org.apache.cassandra.cql3.statements.SelectStatement.process(SelectStatement.java:655) > at > org.apache.cassandra.cql3.statements.SelectStatement.processResults(SelectStatement.java:147) > at > org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:136) > at > org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:62) > at > org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:132) > at > org.apache.cassandra.cql3.QueryProcessor.processPrepared(QueryProcessor.java:254) > at > org.apache.cassandra.thrift.CassandraServer.execute_prepared_cql3_query(CassandraServer.java:1851) > at > org.apache.cassandra.thrift.Cassandra$Processor$execute_prepared_cql3_query.getResult(Cassandra.java:4166) > at > org.apache.cassandra.thrift.Cassandra$Processor$execute_prepared_cql3_query.getResult(Cassandra.java:4154) > at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:32) > at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:34) > at > org.apache.cassandra.thrift.CustomTThreadPoolServer$WorkerProcess.run(CustomTThreadPoolServer.java:199) > at > java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) > at java.lang.Thread.run(Thread.java:662) -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira