How to know deploy mode of PySpark application?
Solution 1
If you are running an interactive shell, e.g. pyspark
(CLI or via an IPython notebook), by default you are running in client
mode. You can easily verify that you cannot run pyspark
or any other interactive shell in cluster
mode:
$ pyspark --master yarn --deploy-mode cluster
Python 2.7.11 (default, Mar 22 2016, 01:42:54)
[GCC Intel(R) C++ gcc 4.8 mode] on linux2
Type "help", "copyright", "credits" or "license" for more information.
Error: Cluster deploy mode is not applicable to Spark shells.
$ spark-shell --master yarn --deploy-mode cluster
Error: Cluster deploy mode is not applicable to Spark shells.
Examining the contents of the bin/pyspark
file may be instructive, too - here is the final line (which is the actual executable):
$ pwd
/home/ctsats/spark-1.6.1-bin-hadoop2.6
$ cat bin/pyspark
[...]
exec "${SPARK_HOME}"/bin/spark-submit pyspark-shell-main --name "PySparkShell" "$@"
i.e. pyspark
is actually a script run by spark-submit
and given the name PySparkShell
, by which you can find it in the Spark History Server UI; and since it is run like that, it goes by whatever arguments (or defaults) are included with its spark-submit
command.
Solution 2
Since sc.deployMode
is not available in PySpark, you could check spark.submit.deployMode
scala> sc.getConf.get("spark.submit.deployMode")
res0: String = client
This is not available in PySpark
Use sc.deployMode
scala> sc.deployMode
res0: String = client
scala> sc.version
res1: String = 2.1.0-SNAPSHOT
Solution 3
As of Spark 2+ the below works.
for item in spark.sparkContext.getConf().getAll():print(item)
(u'spark.submit.deployMode', u'client') # will be one of the items in the list.
Comments
-
makansij almost 2 years
I am trying to fix an issue with running out of memory, and I want to know whether I need to change these settings in the default configurations file (
spark-defaults.conf
) in the spark home folder. Or, if I can set them in the code.I saw this question PySpark: java.lang.OutofMemoryError: Java heap space and it says that it depends on if I'm running in
client
mode. I'm running spark on a cluster and monitoring it using standalone.But, how do I figure out if I'm running spark in
client
mode? -
Jacek Laskowski almost 8 yearsOP asked about how to know the deploy mode of a running spark (application).
-
desertnaut almost 8 yearsAnd you consider this reason for downvoting? At the end, my answer does address the question, which is how to know... Question is also clearly about the pyspark API, not Scala - nevertheless, I upvoted your answer because I learned something (and this is my main criterion for upvoting...).
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Jacek Laskowski almost 8 yearsThanks @desertnaut. I appreciate the upvoting. My downvoting was to mark your answer as slightly offbase -- you didn't really answer the question (I may've not either but left the OP with a home work :))
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desertnaut almost 8 yearsThanks for the reply. I would argue though that "slightly offbase" answers do not deserve downvotings...