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https://issues.apache.org/jira/browse/CASSANDRA-6152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13790717#comment-13790717
 ] 

Donald Smith commented on CASSANDRA-6152:
-----------------------------------------

The test just runs our test suite repeatedly. After a few runs it gets the 
following, with TRACE level. I'll document more later.
{noformat}
DEBUG [Native-Transport-Requests:11] 2013-10-09 11:40:49,459 Message.java (line 
302) Received: PREPARE INSERT INTO 
as_reports.data_report_details(report_id,item_name,item_value) VALUES 
(7bc2a570-a42b-4632-b245-f0db9255ccc3,?,?);, v=1
TRACE [Native-Transport-Requests:11] 2013-10-09 11:40:49,460 
QueryProcessor.java (line 208) Stored prepared statement 
ef4c655e042ffab2c1f0eef1e53a573e with 2 bind markers
DEBUG [Native-Transport-Requests:11] 2013-10-09 11:40:49,460 Tracing.java (line 
157) request complete
DEBUG [Native-Transport-Requests:11] 2013-10-09 11:40:49,460 Message.java (line 
309) Responding: RESULT PREPARED ef4c655e042ffab2c1f0eef1e53a573e 
[item_name(as_reports, data_report_details), 
org.apache.cassandra.db.marshal.UTF8Type][item_value(as_reports, 
data_report_details), org.apache.cassandra.db.marshal.UTF8Type] 
(resultMetadata=[0 columns]), v=1
DEBUG [Native-Transport-Requests:13] 2013-10-09 11:40:49,464 Message.java (line 
302) Received: EXECUTE ef4c655e042ffab2c1f0eef1e53a573e with 2 values at 
consistency ONE, v=1
TRACE [Native-Transport-Requests:13] 2013-10-09 11:40:49,464 
QueryProcessor.java (line 232) [1] 'java.nio.HeapByteBuffer[pos=0 lim=0 cap=0]'
TRACE [Native-Transport-Requests:13] 2013-10-09 11:40:49,464 
QueryProcessor.java (line 232) [2] 'java.nio.HeapByteBuffer[pos=36 lim=41 
cap=43]'
TRACE [Native-Transport-Requests:13] 2013-10-09 11:40:49,464 
QueryProcessor.java (line 97) Process 
org.apache.cassandra.cql3.statements.UpdateStatement@321baa4a @CL.ONE
ERROR [COMMIT-LOG-WRITER] 2013-10-09 11:40:49,465 CassandraDaemon.java (line 
185) Exception in thread Thread[COMMIT-LOG-WRITER,5,main]
java.lang.AssertionError
        at 
org.apache.cassandra.db.ColumnSerializer.serialize(ColumnSerializer.java:56)
        at 
org.apache.cassandra.db.ColumnFamilySerializer.serialize(ColumnFamilySerializer.java:77)
        at 
org.apache.cassandra.db.RowMutation$RowMutationSerializer.serialize(RowMutation.java:268)
        at 
org.apache.cassandra.db.commitlog.CommitLogSegment.write(CommitLogSegment.java:229)
        at 
org.apache.cassandra.db.commitlog.CommitLog$LogRecordAdder.run(CommitLog.java:352)
        at 
org.apache.cassandra.db.commitlog.PeriodicCommitLogExecutorService$1.runMayThrow(PeriodicCommitLogExecutorService.java:48)
        at 
org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
        at java.lang.Thread.run(Thread.java:722)
DEBUG [Native-Transport-Requests:13] 2013-10-09 11:40:49,466 Tracing.java (line 
157) request complete
DEBUG [Native-Transport-Requests:13] 2013-10-09 11:40:49,466 Message.java (line 
309) Responding: EMPTY RESULT, v=1
{noformat}

> Assertion error in 2.0.1 at 
> db.ColumnSerializer.serialize(ColumnSerializer.java:56)
> -----------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-6152
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6152
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: CentOS release 6.2 (Final)
> With default set up on single node.
> I also saw this exception in 2.0.0 on a three node cluster.
>            Reporter: Donald Smith
>
> {noformat}
> ERROR [COMMIT-LOG-WRITER] 2013-10-06 12:12:36,845 CassandraDaemon.java (line 
> 185) Exception in thread Thread[COMMIT-LOG-WRITER,5,main]
> java.lang.AssertionError
>         at 
> org.apache.cassandra.db.ColumnSerializer.serialize(ColumnSerializer.java:56)
>         at 
> org.apache.cassandra.db.ColumnFamilySerializer.serialize(ColumnFamilySerializer.java:77)
>         at 
> org.apache.cassandra.db.RowMutation$RowMutationSerializer.serialize(RowMutation.java:268)
>         at 
> org.apache.cassandra.db.commitlog.CommitLogSegment.write(CommitLogSegment.java:229)
>         at 
> org.apache.cassandra.db.commitlog.CommitLog$LogRecordAdder.run(CommitLog.java:352)
>         at 
> org.apache.cassandra.db.commitlog.PeriodicCommitLogExecutorService$1.runMayThrow(PeriodicCommitLogExecutorService.java:48)
>         at 
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
>         at java.lang.Thread.run(Thread.java:722)
> {noformat}



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