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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: quorum read timeout
Date Wed, 19 Aug 2009 21:43:07 GMT
Is this 0.3 or 0.4/trunk?

On Wed, Aug 19, 2009 at 2:36 PM, Phillip
Michalak<phil.michalak@digitalreasoning.com> wrote:
> I'm running three Cassandra nodes in virtual machines.
> During a 'get' operation from Cassandra-remote directed at one of these
> nodes, I'm receiving the following output
>
> vadmin@vadmin:~/cassandra$ interface/gen-py/cassandra/Cassandra-remote -h
> 192.168.133.130:9160 get 'MockElementLibrary' '0401318uuuuruepwdcznr'
> "ColumnPath('strings', None, 'id')" 2
> /usr/local/lib/python2.6/dist-packages/thrift/Thrift.py:58:
> DeprecationWarning: BaseException.message has been deprecated as of Python
> 2.6
>   self.message = message
> /usr/local/lib/python2.6/dist-packages/thrift/Thrift.py:99:
> DeprecationWarning: BaseException.message has been deprecated as of Python
> 2.6
>   self.message = iprot.readString();
> Traceback (most recent call last):
>   File "interface/gen-py/cassandra/Cassandra-remote", line 93, in <module>
>     pp.pprint(client.get(args[0],args[1],eval(args[2]),eval(args[3]),))
>   File
> "/home/vadmin/cassandra-0.4.0-beta1/interface/gen-py/cassandra/Cassandra.py",
> line 182, in get
>     return self.recv_get()
>   File
> "/home/vadmin/cassandra-0.4.0-beta1/interface/gen-py/cassandra/Cassandra.py",
> line 201, in recv_get
>     raise x
> thrift.Thrift.TApplicationException/usr/local/lib/python2.6/dist-packages/thrift/Thrift.py:76:
> DeprecationWarning: BaseException.message has been deprecated as of Python
> 2.6
>   if self.message:
> /usr/local/lib/python2.6/dist-packages/thrift/Thrift.py:77:
> DeprecationWarning: BaseException.message has been deprecated as of Python
> 2.6
>   return self.message
> : Internal error processing get
>
> The same 'get' operation from Cassandra-remote directed at another of these
> nodes, yields 'normal' output
> vadmin@vadmin:~/cassandra$ interface/gen-py/cassandra/Cassandra-remote -h
> 192.168.133.129:9160 get 'MockElementLibrary' '0401318uuuuruepwdcznr'
> "ColumnPath('strings', None, 'id')" 2
> Traceback (most recent call last):
>   File "interface/gen-py/cassandra/Cassandra-remote", line 93, in <module>
>     pp.pprint(client.get(args[0],args[1],eval(args[2]),eval(args[3]),))
>   File
> "/home/vadmin/cassandra-0.4.0-beta1/interface/gen-py/cassandra/Cassandra.py",
> line 182, in get
>     return self.recv_get()
>   File
> "/home/vadmin/cassandra-0.4.0-beta1/interface/gen-py/cassandra/Cassandra.py",
> line 210, in recv_get
>     raise result.nfe
> ttypes.NotFoundException: NotFoundException()
> Furthermore, querying the same column for (some) other keys is successful
> when no matter which node it is directed at.
> Looking at the log for the node that produced the error from the query
> above:
>
> DEBUG [pool-1-thread-22] 2009-08-19 16:54:57,618 CassandraServer.java (line
> 221) get
> DEBUG [pool-1-thread-22] 2009-08-19 16:54:57,618 StorageProxy.java (line
> 420) strongread reading data for
> SliceByNamesReadCommand(table='MockElementLibrary',
> key='0401318uuuuruepwdcznr',
> columnParent='QueryPath(columnFamilyName='strings', superColumnName='null',
> columnName='null')', columns=[id,]) from 38184@null
> DEBUG [pool-1-thread-22] 2009-08-19 16:54:57,619 StorageProxy.java (line
> 427) strongread reading digest for
> SliceByNamesReadCommand(table='MockElementLibrary',
> key='0401318uuuuruepwdcznr',
> columnParent='QueryPath(columnFamilyName='strings', superColumnName='null',
> columnName='null')', columns=[id,]) from 38185@192.168.133.129:7000
>  WARN [MESSAGE-SERIALIZER-POOL:4] 2009-08-19 16:54:57,619
> MessageSerializationTask.java (line 81) Exception was generated at :
> 08/19/2009 16:54:57 on thread MESSAGE-SERIALIZER-POOL:4
> java.lang.NullPointerException
>         at
> org.apache.cassandra.net.TcpConnection.<init>(TcpConnection.java:83)
>         at
> org.apache.cassandra.net.TcpConnectionManager.getConnection(TcpConnectionManager.java:64)
>         at
> org.apache.cassandra.net.MessagingService.getConnection(MessagingService.java:306)
>         at
> org.apache.cassandra.net.MessageSerializationTask.run(MessageSerializationTask.java:66)
>         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)
> DEBUG [RESPONSE-STAGE:4] 2009-08-19 16:54:57,622 ResponseVerbHandler.java
> (line 38) Processing response on a callback
> from 65B1E352-A0A3-1A7F-138B-9BEA3E1D787F@192.168.133.129:7000
> ERROR [pool-1-thread-22] 2009-08-19 16:55:02,619 Cassandra.java (line 608)
> Internal error processing get
> java.lang.RuntimeException: java.util.concurrent.TimeoutException: Operation
> timed out - received only 1 responses from 192.168.133.129:7000 .
>         at
> org.apache.cassandra.service.CassandraServer.readColumnFamily(CassandraServer.java:100)
>         at
> org.apache.cassandra.service.CassandraServer.get(CassandraServer.java:226)
>         at
> org.apache.cassandra.service.Cassandra$Processor$get.process(Cassandra.java:602)
>         at
> org.apache.cassandra.service.Cassandra$Processor.process(Cassandra.java:560)
>         at
> org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:252)
>         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)
> Caused by: java.util.concurrent.TimeoutException: Operation timed out -
> received only 1 responses from 192.168.133.129:7000 .
>         at
> org.apache.cassandra.service.QuorumResponseHandler.get(QuorumResponseHandler.java:86)
>         at
> org.apache.cassandra.service.StorageProxy.strongRead(StorageProxy.java:435)
>         at
> org.apache.cassandra.service.StorageProxy.readProtocol(StorageProxy.java:330)
>         at
> org.apache.cassandra.service.CassandraServer.readColumnFamily(CassandraServer.java:92)
>         ... 7 more
>
> It appears to me that there is a timeout during the QuorumResponseHandler
> processing, stemming from a NullPointerException that occurs as part of the
> read process. I suspect that this NullPointerException has something to do
> with the second DEBUG [pool-1-thread-22] comment regarding strongread ...
> from 38184@null.
> Does anyone know why this might be happening?
> Thanks for any insight,
> Phil
>

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