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From aaron morton <aa...@thelastpickle.com>
Subject Re: Internal error processing get_slice (NullPointerException)
Date Fri, 30 Mar 2012 23:06:31 GMT
Fixed in 1.0.9 / 1.1 https://issues.apache.org/jira/browse/CASSANDRA-4095

Cheers


-----------------
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com

On 27/03/2012, at 12:56 PM, John Laban wrote:

> Has anyone seen this particular NPE before from Cassandra?
> 
> This is on 1.0.8.  It seems to happen transiently on multiple nodes in my cluster, every
so often, and goes away.
> 
> 
> ERROR [Thrift:45] 2012-03-26 19:59:12,024 Cassandra.java (line 3041) Internal error processing
get_slice
> java.lang.NullPointerException
>         at org.apache.cassandra.db.SliceFromReadCommand.maybeGenerateRetryCommand(SliceFromReadCommand.java:76)
>         at org.apache.cassandra.service.StorageProxy.fetchRows(StorageProxy.java:724)
>         at org.apache.cassandra.service.StorageProxy.read(StorageProxy.java:564)
>         at org.apache.cassandra.thrift.CassandraServer.readColumnFamily(CassandraServer.java:128)
>         at org.apache.cassandra.thrift.CassandraServer.getSlice(CassandraServer.java:283)
>         at org.apache.cassandra.thrift.CassandraServer.multigetSliceInternal(CassandraServer.java:365)
>         at org.apache.cassandra.thrift.CassandraServer.get_slice(CassandraServer.java:326)
>         at org.apache.cassandra.thrift.Cassandra$Processor$get_slice.process(Cassandra.java:3033)
>         at org.apache.cassandra.thrift.Cassandra$Processor.process(Cassandra.java:2889)
>         at org.apache.cassandra.thrift.CustomTThreadPoolServer$WorkerProcess.run(CustomTThreadPoolServer.java:187)
>         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:662)
> 
> 
> 
> The line in question is (I think) the one below, so it looks like the column family reference
for a row can sometimes be null?
> 
> int liveColumnsInRow = row != null ? row.cf.getLiveColumnCount() : 0;
> 
> 
> Thanks,
> John


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