[jira] [Created] (CASSANDRA-6343) C* throws AssertionError when using paging and reverse ordering

["Alexey Chumakov (JIRA)" <ji...@apache.org>]

Alexey Chumakov created CASSANDRA-6343:
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             Summary: C* throws AssertionError when using paging and reverse ordering
                 Key: CASSANDRA-6343
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6343
             Project: Cassandra
          Issue Type: Bug
          Components: Core
         Environment: Last time issue has been reproduced with C* version is 2.0.0, DataStax CQL driver version 2.0.0-beta1 on a single node.
            Reporter: Alexey Chumakov


We have a table with CLUSTERING ORDER BY (date DESC). We try to do a query C* with paging and ORDER BY date ASC. 
This leads to the following exception in C* when pager goes to the last page:
{quote}
ERROR [Native-Transport-Requests:1287744] 2013-10-30 01:53:14,720 ErrorMessage.java (line 210) Unexpected exception during request
java.lang.AssertionError: Added column does not sort as the first column
        at org.apache.cassandra.db.ArrayBackedSortedColumns.addColumn(ArrayBackedSortedColumns.java:115)
        at org.apache.cassandra.db.ColumnFamily.addColumn(ColumnFamily.java:116)
        at org.apache.cassandra.service.pager.AbstractQueryPager.discardLast(AbstractQueryPager.java:238)
        at org.apache.cassandra.service.pager.AbstractQueryPager.discardLast(AbstractQueryPager.java:182)
        at org.apache.cassandra.service.pager.AbstractQueryPager.fetchPage(AbstractQueryPager.java:100)
        at org.apache.cassandra.service.pager.SliceQueryPager.fetchPage(SliceQueryPager.java:33)
        at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:179)
        at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:56)
        at org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:101)
        at org.apache.cassandra.cql3.QueryProcessor.processPrepared(QueryProcessor.java:235)
        at org.apache.cassandra.transport.messages.ExecuteMessage.execute(ExecuteMessage.java:139)
        at org.apache.cassandra.transport.Message$Dispatcher.messageReceived(Message.java:296)
        at org.jboss.netty.handler.execution.ChannelUpstreamEventRunnable.doRun(ChannelUpstreamEventRunnable.java:45)
        at org.jboss.netty.handler.execution.ChannelEventRunnable.run(ChannelEventRunnable.java:69)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:724)
{quote}





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