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From "Jonathan Hseu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-643) NullPointerException when calling get_range_slice()
Date Mon, 21 Dec 2009 16:58:18 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12793262#action_12793262
] 

Jonathan Hseu commented on CASSANDRA-643:
-----------------------------------------

+1

Thanks.

> NullPointerException when calling get_range_slice()
> ---------------------------------------------------
>
>                 Key: CASSANDRA-643
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-643
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.5
>         Environment: Linux
>            Reporter: Jonathan Hseu
>            Assignee: Jonathan Ellis
>             Fix For: 0.5
>
>         Attachments: 643.patch
>
>
> This bug affects 0.5.0beta2.
> In the SlicePredicate struct, column_names is defined as "optional", and so can be null.
> get_range_slice() passes the "predicate.getColumn_names()" to "ThriftValidation.validateColumns()"
without first checking if it's null, resulting in the following exception:
> java.lang.NullPointerException
> 	at org.apache.cassandra.service.ThriftValidation.validateColumns(ThriftValidation.java:162)
> 	at org.apache.cassandra.service.ThriftValidation.validateColumns(ThriftValidation.java:181)
> 	at org.apache.cassandra.service.CassandraServer.get_range_slice(CassandraServer.java:562)
> 	at org.apache.cassandra.service.Cassandra$Processor$get_range_slice.process(Cassandra.java:1024)
> 	at org.apache.cassandra.service.Cassandra$Processor.process(Cassandra.java:817)
> 	at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:253)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> 	at java.lang.Thread.run(Thread.java:619)
> Strangely enough, calling it from python doesn't generate this exception, but calling
it from C++ does, with the following code:
> shared_ptr<TTransport> transport(new TSocket(host, port));
> shared_ptr<TProtocol> proto(new TBinaryProtocol(transport));
> CassandraClient client(proto);
> transport->open();
> ColumnParent column_parent;
> column_parent.column_family = "Test";
> SlicePredicate slice_predicate;
> std::vector<KeySlice> keys;
> client.get_range_slice(keys, keyspace, column_parent, slice_predicate, "", "", 100, ONE);
> The fix is trivial, just check that predicate.getColumn_names() is not null in line 562
of CassandraServer.java

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