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Python native implementation of the Spark RDD interface.

Project description


A native Python implementation of Spark's RDD interface, but instead of
being resilient and distributed it is just transient and local; but
fast (lower latency than PySpark). It is a drop in replacement
for PySpark's SparkContext and RDD.

Use case: you have a pipeline that processes 100k input documents
and converts them to normalized features. They are used to train a local
scikit-learn classifier. The preprocessing is perfect for a full Spark
task. Now, you want to use this trained classifier in an API
endpoint. You need the same pre-processing pipeline for a single
document per API call. This does not have to be done in parallel, but there
should be only a small overhead in initialization and preferably no
dependency on the JVM. This is where ``pysparkling`` shines.

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.. code-block:: bash

pip install pysparkling


* Parallelization via ``multiprocessing.Pool``,
``concurrent.futures.ThreadPoolExecutor`` or any other Pool-like
objects that have a ``map(func, iterable)`` method.
* AWS S3 is supported. Use file paths of the form
``s3n://bucket_name/filename.txt`` with ``Context.textFile()``.
Specify multiple files separated by comma.
Use environment variables ``AWS_SECRET_ACCESS_KEY`` and
``AWS_ACCESS_KEY_ID`` for auth. Mixed local and S3 files are supported.
Glob expressions (filenames with ``*`` and ``?``) are resolved.
* Lazy execution is in development.
* Seamless handling of compressed files is not supported yet.
* only dependency: ``boto`` for AWS S3 access


Count the lines in the ``*.py`` files in the ``tests`` directory:

.. code-block:: python

import pysparkling

context = pysparkling.Context()



* ``__init__(pool=None)``: takes a pool object (an object that has a ``map()``
method, e.g. a multiprocessing.Pool) to parallelize all ``map()`` and
``foreach()`` methods.
* ``textFile(filename)``: load every line of a text file into a RDD.
``filename`` can contain a comma separated list of many files, ``?`` and
``*`` wildcards, file paths on S3 (``s3n://bucket_name/filename.txt``) and
local file paths (``relative/path/my_text.txt``, ``/absolut/path/my_text.txt``
or ``file:///absolute/file/path.txt``). If the filename points to a folder
containing ``part*`` files, those are resolved.
* ``broadcast(var)``: returns an instance of ``Broadcast()`` and it's values
are accessed with ``value``.


* ``cache()``: execute previous steps and cache result
* ``coalesce()``: do nothing
* ``collect()``: return the underlying list
* ``count()``: get length of internal list
* ``countApprox()``: same as ``count()``
* ``countByKey``: input is list of pairs, returns a dictionary
* ``countByValue``: input is a list, returns a dictionary
* ``context()``: return the context
* ``distinct()``: returns a new RDD containing the distinct elements
* ``filter(func)``: return new RDD filtered with func
* ``first()``: return first element
* ``flatMap(func)``: return a new RDD of a flattened map
* ``flatMapValues(func)``: return new RDD
* ``fold(zeroValue, op)``: aggregate elements
* ``foldByKey(zeroValue, op)``: aggregate elements by key
* ``foreach(func)``: apply func to every element in place
* ``foreachPartition(func)``: same as ``foreach()``
* ``groupBy(func)``: group by the output of func
* ``groupByKey()``: group by key where the RDD is of type [(key, value), ...]
* ``histogram(buckets)``: buckets can be a list or an int
* ``id()``: currently just returns None
* ``intersection(other)``: return a new RDD with the intersection
* ``isCheckpointed()``: returns False
* ``join(other)``: join
* ``keyBy(func)``: creates tuple in new RDD
* ``keys()``: returns the keys of tuples in new RDD
* ``leftOuterJoin(other)``: left outer join
* ``lookup(key)``: return list of values for this key
* ``map(func)``: apply func to every element and return a new RDD
* ``mapValues(func)``: apply func to value in (key, value) pairs and return a new RDD
* ``max()``: get the maximum element
* ``mean()``: mean
* ``min()``: get the minimum element
* ``name()``: RDD's name
* ``persist()``: implemented as synonym for ``cache()``
* ``pipe(command)``: pipe the elements through an external command line tool
* ``reduce()``: reduce
* ``reduceByKey()``: reduce by key and return the new RDD
* ``rightOuterJoin(other)``: right outer join
* ``saveAsTextFile(path)``: save RDD as text file
* ``subtract(other)``: return a new RDD without the elements in other
* ``sum()``: sum
* ``take(n)``: get the first n elements
* ``takeSample(n)``: get n random samples


* ``value``: access the value it stores


* `master <>`_
* `0.1.1 <>`_ (2015-05-12)
* implemented a few more RDD methods
* changed handling of context in RDD
* 0.1.0 (2015-05-09)

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