Github user rahulsinghaliitd commented on the pull request:
https://github.com/apache/spark/pull/1076#issuecomment-50545834
Hi Matei, yes, the report() call is blocking. The time it takes will depend
on the underlying reporter. For e.g., the CsvReporter which updates files on
local filesystem make block for some time if the number of properties is quite
large.
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