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From Sheng Chen <chensheng2...@gmail.com>
Subject Stress tests failed with secondary index
Date Wed, 06 Apr 2011 10:39:54 GMT
I used py_stress module to insert 10m test data with a secondary index.
I got the following exceptions.

# python stress.py -d xxx -o insert -n 10000000 -c 5 -s 34 -C 5 -x keys
total,interval_op_rate,interval_key_rate,avg_latency,elapsed_time
265322,26532,26541,0.00186140829433,10
630300,36497,36502,0.00129331431204,20
986781,35648,35640,0.0013310986218,30
1332190,34540,34534,0.00135942295893,40
1473578,14138,14138,0.00142941070007,50
Process Inserter-38:
Traceback (most recent call last):
  File "/usr/lib64/python2.4/site-packages/multiprocessing/process.py", line
237, in _bootstrap
    self.run()
  File "stress.py", line 242, in run
    self.cclient.batch_mutate(cfmap, consistency)
  File
"/root/apache-cassandra-0.7.4-src/interface/thrift/gen-py/cassandra/Cassandra.py",
line 784, in batch_mutate
TimedOutException: TimedOutException(args=())
    self.run()
  File "stress.py", line 242, in run
    self.recv_batch_mutate()
  File
"/root/apache-cassandra-0.7.4-src/interface/thrift/gen-py/cassandra/Cassandra.py",
line 810, in recv_batch_mutate
    raise result.te


Tests without secondary index is ok at about 40k ops/sec.

There is a `GC for ParNew` for about 200ms taking place every second. Does
it matter?
The same gc for about 400ms happens every 2 seconds, which does not hurt the
inserts without secondary index.

Thanks in advance for any advice.

Sheng

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