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https://issues.apache.org/jira/browse/SPARK-12100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15557219#comment-15557219
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holdenk commented on SPARK-12100:
---------------------------------
Just noting related progress in https://github.com/apache/spark/pull/11211 /
SPARK-13330
> bug in spark/python/pyspark/rdd.py portable_hash()
> --------------------------------------------------
>
> Key: SPARK-12100
> URL: https://issues.apache.org/jira/browse/SPARK-12100
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Affects Versions: 1.5.1
> Reporter: Andrew Davidson
> Priority: Minor
> Labels: hashing, pyspark
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> 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(y).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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