Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/634#issuecomment-42146849
A little more detail on the JIRA, but, to summarize, the sleep is to wait
for executors to connect. What's confusing to me is that Spark standalone
doesn't have a similar sleep.
@mridulm is the worry that only some executors would register and that
tasks would then unnecessarily get scheduled on nodes where the data isn't
local? Have you seen this negatively impact performance? If that's the case,
I think the best thing would be to wait until some number of executors have
registered.
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