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From "Apache (JIRA)" <>
Subject [jira] Created: (CASSANDRA-1331) Any request after a TApplicationException hangs
Date Wed, 28 Jul 2010 22:04:16 GMT
Any request after a TApplicationException hangs

                 Key: CASSANDRA-1331
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 0.6.3
            Reporter: Apache

Observed that the design of request validation can return without consuming the complete request.
The remnant is then read by the next request and produces a large read size.
readMessageBegin size: 134218752

Sample test case in python:

from cassandra.ttypes import *
from cassandra import Cassandra

from thrift import Thrift
from thrift.transport import TTransport
from thrift.transport import TSocket
from thrift.protocol.TBinaryProtocol import TBinaryProtocolAccelerated
socket = TSocket.TSocket("", 9160)
transport = TTransport.TBufferedTransport(socket)
protocol = TBinaryProtocolAccelerated(transport)
client = Cassandra.Client(protocol)
client.transport = transport

# don't specify a column_family to force a TApplicationException
parent = ColumnParent()
    client.get_count("ignore_keyspace", "ignore_key", parent, 1)
    print "ERROR: we didn't see the problem"
except TApplicationException as e:
    message = "Required field 'column_family' was not present!"
    if e.message.startswith(message):
        print "OK, we got the error we were looking for."
        print "The server input buffer was only partially read,"
        print "  up to the validation error, so our next request"
        print "  will start reading the stale data causing a hang."
        print "hanging..."
        client.get_count("ignore_keyspace", "ignore_key", parent, 1)


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