Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/3143#issuecomment-62561021
I agree all we need is to make it volatile, no other synchronization is
required. It sounds good to commonize the monitor logic inside of
Client/ClientBase. Lets make sure to not have monitorApplication spin off an
extra thread in cluster mode as it would just add extra overhead.
If we want to get this into 1.2 I would rather just have this bug fix the
volatile flag, then file a separate jira to do the other cleanup.
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