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https://issues.apache.org/jira/browse/CASSANDRA-7873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14122265#comment-14122265
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Benedict commented on CASSANDRA-7873:
-------------------------------------
bq. My vote would be for CLQ in 2.1 and Accumulator in 3.0.
SGTM. If you +1 I'll commit to trunk, and separately ninja 2.1 to reduce the
four .size() calls in .resolve() to a single call stored to a local variable.
> java.util.ConcurrentModificationException seen after selecting from
> system_auth
> -------------------------------------------------------------------------------
>
> Key: CASSANDRA-7873
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7873
> Project: Cassandra
> Issue Type: Bug
> Environment: OSX and Ubuntu 14.04
> Reporter: Philip Thompson
> Fix For: 3.0
>
> Attachments: 7873.21.txt, 7873.txt
>
>
> The dtest auth_test.py:TestAuth.system_auth_ks_is_alterable_test is failing
> on trunk only with the following stack trace:
> {code}
> Unexpected error in node1 node log:
> ERROR [Thrift:1] 2014-09-03 15:48:08,389 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.resolve(RowDigestResolver.java:71)
> ~[main/:na]
> at
> org.apache.cassandra.service.RowDigestResolver.resolve(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:1228)
> ~[main/:na]
> at
> org.apache.cassandra.service.StorageProxy.read(StorageProxy.java:1154)
> ~[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.auth.Auth.selectUser(Auth.java:257) ~[main/:na]
> at org.apache.cassandra.auth.Auth.isExistingUser(Auth.java:76)
> ~[main/:na]
> at org.apache.cassandra.service.ClientState.login(ClientState.java:178)
> ~[main/:na]
> at
> org.apache.cassandra.thrift.CassandraServer.login(CassandraServer.java:1486)
> ~[main/:na]
> at
> org.apache.cassandra.thrift.Cassandra$Processor$login.getResult(Cassandra.java:3579)
> ~[thrift/:na]
> at
> org.apache.cassandra.thrift.Cassandra$Processor$login.getResult(Cassandra.java:3563)
> ~[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]
> {code}
> That exception is thrown when the following query is sent:
> {code}
> """SELECT strategy_options
> FROM system.schema_keyspaces
> WHERE keyspace_name = 'system_auth'"""
> {code}
> The test alters the RF of the system_auth keyspace, then shuts down and
> restarts the cluster.
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