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From Dale Richardson <>
Subject Spark config option 'expression language' feedback request
Date Fri, 13 Mar 2015 10:07:57 GMT

PR#4937 ( is a feature to allow for Spark configuration
options (whether on command line, environment variable or a configuration file) to be specified
via a simple expression language.

Such a feature has the following end-user benefits:
- Allows for the flexibility in specifying time intervals or byte quantities in appropriate
and easy to follow units e.g. 1 week rather rather then 604800 seconds

- Allows for the scaling of a configuration option in relation to a system attributes. e.g.


SPARK_WORKER_MEMORY = physicalMemoryBytes - 1.5 GB

- Gives the ability to scale multiple configuration options together eg:

spark.driver.memory = 0.75 * physicalMemoryBytes

spark.driver.maxResultSize = spark.driver.memory * 0.8

The following functions are currently supported by this PR:
NumCores:             Number of cores assigned to the JVM (usually == Physical machine cores)
PhysicalMemoryBytes:  Memory size of hosting machine

JVMTotalMemoryBytes:  Current bytes of memory allocated to the JVM

JVMMaxMemoryBytes:    Maximum number of bytes of memory available to the JVM

JVMFreeMemoryBytes:   maxMemoryBytes - totalMemoryBytes

I was wondering if anybody on the mailing list has any further ideas on other functions that
could be useful to have when specifying spark configuration options?
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