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  1. Spark
  2. SPARK-12100

bug in spark/python/pyspark/rdd.py portable_hash()

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Minor
    • Resolution: Duplicate
    • Affects Version/s: 1.5.1
    • Fix Version/s: None
    • Component/s: PySpark
    • Labels:

      Description

      I am using spark-1.5.1-bin-hadoop2.6. I used spark-1.5.1-bin-hadoop2.6/ec2/spark-ec2 to create a cluster and configured spark-env to use python3. I get and exception 'Randomness of hash of string should be disabled via PYTHONHASHSEED’. Is there any reason rdd.py should not just set PYTHONHASHSEED ?

      Should I file a bug?

      Kind regards

      Andy

      details

      http://spark.apache.org/docs/latest/api/python/pyspark.html?highlight=subtract#pyspark.RDD.subtract

      Example from documentation does not work out of the box

      Subtract(other, numPartitions=None)
      Return each value in self that is not contained in other.

      >>> x = sc.parallelize([("a", 1), ("b", 4), ("b", 5), ("a", 3)])
      >>> y = sc.parallelize([("a", 3), ("c", None)])
      >>> sorted(x.subtract.collect())
      [('a', 1), ('b', 4), ('b', 5)]
      It raises

      if sys.version >= '3.3' and 'PYTHONHASHSEED' not in os.environ:
      raise Exception("Randomness of hash of string should be disabled via PYTHONHASHSEED")

      The following script fixes the problem

      Sudo printf "\n# set PYTHONHASHSEED so python3 will not generate Exception'Randomness of hash of string should be disabled via PYTHONHASHSEED'\nexport PYTHONHASHSEED=123\n" >> /root/spark/conf/spark-env.sh

      sudo pssh i -h /root/spark-ec2/slaves cp /root/spark/conf/spark-env.sh /root/spark/conf/spark-env.sh`date "+%Y-%m-%d:%H:%M"`

      Sudo for i in `cat slaves` ; do scp spark-env.sh root@$i:/root/spark/conf/spark-env.sh; done

      This is how I am starting spark

      export PYSPARK_PYTHON=python3.4
      export PYSPARK_DRIVER_PYTHON=python3.4
      export IPYTHON_OPTS="notebook --no-browser --port=7000 --log-level=WARN"

      $SPARK_ROOT/bin/pyspark \
      --master $MASTER_URL \
      --total-executor-cores $numCores \
      --driver-memory 2G \
      --executor-memory 2G \
      $extraPkgs \
      $*

      see email thread "possible bug spark/python/pyspark/rdd.py portable_hash()' on user@spark for more info

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              • Assignee:
                Unassigned
                Reporter:
                aedwip Andrew Davidson
              • Votes:
                1 Vote for this issue
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                  Updated:
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