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From "Mikhail Stepura (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7873) java.util.ConcurrentModificationException seen after selecting from system_auth
Date Wed, 03 Sep 2014 20:51:51 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14120428#comment-14120428
] 

Mikhail Stepura commented on CASSANDRA-7873:
--------------------------------------------

Or replace {{Collections.synchronizedList}} with something like {{CopyOnWriteArrayList}}

> 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
>
>
> 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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