Jar is cached in yarn-cluster mode?

[Rex Xiong <by...@gmail.com>]

I use "spark-submit -master yarn-cluster hdfs://.../a.jar ......" to submit
my app to yarn.
Then I update this a.jar in HDFS, run the command again, I found a line of
log that was been removed still exist in "yarn logs ....".
Is there a cache mechanism I need to disable?

Thanks