Metrics System not recognizing Custom Source/Sink in application jar

[map reduced <k3...@gmail.com>]

Hi,

I've added Custom Source and Sink in my application jar and found a way to
get a static fixed metrics.properties on Stand-alone cluster nodes. When I
want to launch my application, I give the static path -
spark.metrics.conf="/fixed-path/to/metrics.properties". Despite my custom
source/sink being in my code/fat-jar - I get ClassNotFoundException on
CustomSink.

My fat-jar (with Custom Source/Sink code in it) is on hdfs with read access
to all.

So here's what all I've already tried setting (since executors can't find
Custom Source/Sink in my application fat-jar):

   1. spark.executor.extraClassPath = hdfs://path/to/fat-jar
   2. spark.executor.extraClassPath = fat-jar-name.jar
   3. spark.executor.extraClassPath = ./fat-jar-name.jar
   4. spark.executor.extraClassPath = ./
   5. spark.executor.extraClassPath = /dir/on/cluster/* (although * is not
   at file level, there are more directories - I have no way of knowing random
   application-id or driver-id to give absolute name before launching the app)

It seems like this is how executors are getting initialized for this case
(please correct me if I am wrong) -

   1. Driver tells here's the jar location - hdfs://../fat-jar.jar and here
   are some properties like spark.executor.memory etc.
   2. N number of Executors spin up (depending on configuration) on cluster
   3. Start downloading hdfs://../fat-jar.jar but initialize metrics system
   in the mean time (? - not sure of this step)
   4. Metrics system looking for Custom Sink/Source files - since it's
   mentioned in metrics.properties - even before it's done downloading fat-jar
   (which actually has all those files) (this is my hypothesis)
   5. ClassNotFoundException - CustomSink not found!

Is my understanding correct? Moreover, is there anything else I can try? If
anyone has experience with custom source/sinks, any help would be
appreciated.

My SO question:
https://stackoverflow.com/questions/39763364/metrics-system-not-recognizing-custom-source-sink-in-application-jar


Thanks,

KP