I'm looking at Distributed Shell as an example for writing a YARN application.
My question is why are the script path and associated metadata saved as environment variables? Are there any other ways besides environment variables or command line arguments for passing data from the Client to the ApplicationMaster?
Command line arguments & env variables are the most direct options.
A more onerous option is to write some data to a file in HDFS, use LocalResource to ship it to the container on each node and get application code to read that file locally. (In MRv1 parlance that is "Distributed Cache").
On Jan 29, 2014, at 12:59 PM, Brian C. Huffman <[EMAIL PROTECTED]> wrote: Arun C. Murthy Hortonworks Inc. http://hortonworks.com/
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while your at it, what about adding values to the Configuration() object, does that still work as a hack for information passing? On Wed, Jan 29, 2014 at 5:25 PM, Arun C Murthy <[EMAIL PROTECTED]> wrote:
Adding values to a Configuration object does not really work unless you serialize the config into a file and send it over to the AM and containers as a local resource. The application code would then need to load in this file using Configuration::addResource(). MapReduce does this by taking in all user configured values and serializing them in the form of job.xml. On Jan 29, 2014, at 2:42 PM, Jay Vyas wrote:
Hitesh Shah 2014-01-31, 04:27
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