Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2944#issuecomment-60505192
One subtle issue that I've run into is that the driver always runs a block
manager but only runs an Executor in local mode. So, the "executors" tab in
the web UI is slightly misleading when running in a cluster mode, since the
driver doesn't run a regular executor. It would be nice to have driver /
application thread dumps in this UI, too, so I wonder if there's a clean way to
fix this.
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