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https://issues.apache.org/jira/browse/SPARK-21186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16071254#comment-16071254
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Jeff Zhang commented on SPARK-21186:
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I think this is due to how spark-deep-learning distribute its jar and python
code. --packages is supposed to be for jar not for python stuff. so spark won't
put it under PYTHONPATH
> PySpark with --packages fails to import library due to lack of pythonpath to
> .ivy2/jars/*.jar
> ---------------------------------------------------------------------------------------------
>
> Key: SPARK-21186
> URL: https://issues.apache.org/jira/browse/SPARK-21186
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Affects Versions: 2.2.0
> Environment: Spark is downloaded and compiled by myself.
> Spark: 2.2.0-SNAPSHOT
> Python: Anaconda Python2 (on client and workers)
> Reporter: HanCheol Cho
> Priority: Minor
>
> I experienced "ImportError: No module named sparkdl" exception while trying
> to use databricks' spark-deep-learning (sparkdl) in PySpark.
> The package is included with --packages option as below.
> {code}
> $ pyspark --packages databricks:spark-deep-learning:0.1.0-spark2.1-s_2.11
> >>> import sparkdl
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> ImportError: No module named sparkdl
> {code}
> The problem was that PySpark fails to detect this package's jar files located
> in .ivy2/jars/ directory.
> I could circumvent this issue by manually adding this path to PYTHONPATH
> after launching PySpark as follows.
> {code}
> $ pyspark --packages databricks:spark-deep-learning:0.1.0-spark2.1-s_2.11
> >>> import sys, glob, os
> >>> sys.path.extend(glob.glob(os.path.join(os.path.expanduser("~"),
> >>> ".ivy2/jars/*.jar")))
> >>>
> >>> import sparkdl
> Using TensorFlow backend.
> >>> my_images = sparkdl.readImages("data/flower_photos/daisy/*.jpg")
> >>> my_images.show()
> +--------------------+--------------------+
> | filePath| image|
> +--------------------+--------------------+
> |hdfs://mycluster/...|[RGB,263,320,3,[B...|
> |hdfs://mycluster/...|[RGB,313,500,3,[B...|
> |hdfs://mycluster/...|[RGB,215,320,3,[B...|
> ...
> {code}
> I think that it may be better to add ivy2/jar directory path to PYTHONPATH
> while launching PySpark.
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