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From "Carl Yeksigian (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-8090) NullPointerException when using prepared statements
Date Thu, 09 Oct 2014 15:01:34 GMT
Carl Yeksigian created CASSANDRA-8090:
-----------------------------------------

             Summary: NullPointerException when using prepared statements
                 Key: CASSANDRA-8090
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8090
             Project: Cassandra
          Issue Type: Bug
            Reporter: Carl Yeksigian


Due to the changes in CASSANDRA-4914, using a prepared statement from multiple threads leads
to a race condition where the simple selection may be reset from a different thread, causing
the following NPE:

{noformat}
java.lang.NullPointerException: null
	at org.apache.cassandra.cql3.ResultSet.addRow(ResultSet.java:63) ~[main/:na]
	at org.apache.cassandra.cql3.statements.Selection$ResultSetBuilder.build(Selection.java:372)
~[main/:na]
	at org.apache.cassandra.cql3.statements.SelectStatement.process(SelectStatement.java:1120)
~[main/:na]
	at org.apache.cassandra.cql3.statements.SelectStatement.processResults(SelectStatement.java:283)
~[main/:na]
	at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:260)
~[main/:na]
	at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:213)
~[main/:na]
	at org.apache.cassandra.cql3.statements.SelectStatement.execute(SelectStatement.java:63)
~[main/:na]
	at org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:226) ~[main/:na]
	at org.apache.cassandra.cql3.QueryProcessor.processPrepared(QueryProcessor.java:481) ~[main/:na]
	at org.apache.cassandra.transport.messages.ExecuteMessage.execute(ExecuteMessage.java:133)
~[main/:na]
	at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:438) [main/:na]
	at org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:334) [main/:na]
	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
[netty-all-4.0.23.Final.jar:4.0.23.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333)
[netty-all-4.0.23.Final.jar:4.0.23.Final]
	at io.netty.channel.AbstractChannelHandlerContext.access$700(AbstractChannelHandlerContext.java:32)
[netty-all-4.0.23.Final.jar:4.0.23.Final]
	at io.netty.channel.AbstractChannelHandlerContext$8.run(AbstractChannelHandlerContext.java:324)
[netty-all-4.0.23.Final.jar:4.0.23.Final]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [na:1.7.0_67]
	at org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$FutureTask.run(AbstractTracingAwareExecutorService.java:163)
[main/:na]
	at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:103) [main/:na]
	at java.lang.Thread.run(Thread.java:745) [na:1.7.0_67]
{noformat}

Reproduced this using the stress tool:
{noformat}
 ./tools/bin/cassandra-stress user profile=tools/cqlstress-example.yaml ops\(insert=1,simple1=1\)
{noformat}

You'll need to change the {noformat}select:{noformat} line to be /1000 to prevent the illegal
query exceptions.



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