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From "Normen Seemann (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-4596) thrift call to get_paged_slice() hangs if end token is "0"
Date Thu, 30 Aug 2012 23:37:07 GMT
Normen Seemann created CASSANDRA-4596:
-----------------------------------------

             Summary: thrift call to get_paged_slice() hangs if end token is "0"
                 Key: CASSANDRA-4596
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4596
             Project: Cassandra
          Issue Type: Bug
          Components: API, Core, Hadoop
    Affects Versions: 1.1.3
         Environment: linux
            Reporter: Normen Seemann


I am using get_paged_slice() for range scans driven from within hadoop mappers. The mapper
that scans the "last segment" with get_paged_slice() where start key is set *and* end_token
is set to "0" token hangs within the thirft call. Client shows following jstack:

 - java.net.SocketInputStream.socketRead0(java.io.FileDescriptor, byte[], int, int, int) @bci=0
(Interpreted frame)
 - java.net.SocketInputStream.read(byte[], int, int) @bci=84, line=129 (Interpreted frame)
 - org.apache.thrift.transport.TIOStreamTransport.read(byte[], int, int) @bci=25, line=127
(Interpreted frame)
 - org.apache.thrift.transport.TTransport.readAll(byte[], int, int) @bci=22, line=84 (Interpreted
frame)
 - org.apache.thrift.transport.TFramedTransport.readFrame() @bci=10, line=129 (Interpreted
frame)
 - org.apache.thrift.transport.TFramedTransport.read(byte[], int, int) @bci=28, line=101 (Interpreted
frame)
 - org.apache.thrift.transport.TTransport.readAll(byte[], int, int) @bci=22, line=84 (Interpreted
frame)
 - org.apache.thrift.protocol.TBinaryProtocol.readAll(byte[], int, int) @bci=12, line=378
(Interpreted frame)
 - org.apache.thrift.protocol.TBinaryProtocol.readI32() @bci=52, line=297 (Interpreted frame)
 - org.apache.thrift.protocol.TBinaryProtocol.readMessageBegin() @bci=1, line=204 (Interpreted
frame)
 - org.apache.thrift.TServiceClient.receiveBase(org.apache.thrift.TBase, java.lang.String)
@bci=4, line=69 (Interpreted frame)
 - org.apache.cassandra.thrift.Cassandra$Client.recv_get_paged_slice() @bci=12, line=727 (Interpreted
frame)
 - org.apache.cassandra.thrift.Cassandra$Client.get_paged_slice(java.lang.String, org.apache.cassandra.thrift.KeyRange,
java.nio.ByteBuffer, org.apache.cassandra.thrift.ConsistencyLevel) @bci=10, line=711 (Interpreted
frame)

Changing the end_token from "0" to "2**127-1" fixes the problem, however, I would only consider
this a workaround. Now, there are actually two issues:

1.) Is the call to get_paged_slice() I described supported at all?
2.) if it is not supported please fix with reasonable error instead of just hanging

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