Shay Rojansky created SPARK-2945:
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Summary: Allow specifying num of executors in the context
configuration
Key: SPARK-2945
URL: https://issues.apache.org/jira/browse/SPARK-2945
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 1.0.0
Environment: Ubuntu precise, on YARN (CDH 5.1.0)
Reporter: Shay Rojansky
Running on YARN, the only way to specify the number of executors seems to be on
the command line of spark-submit, via the --num-executors switch.
In many cases this is too early. Our Spark app receives some cmdline arguments
which determine the amount of work that needs to be done - and that affects the
number of executors it ideally requires. Ideally, the Spark context
configuration would support specifying this like any other config param.
Our current workaround is a wrapper script that determines how much work is
needed, and which itself launches spark-submit with the number passed to
--num-executors - it's a shame to have to do this.
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