Github user jerryshao commented on the pull request:
https://github.com/apache/spark/pull/1056#issuecomment-45820580
Hi @sryza , two quick questions:
1. Will this add additional overhead to Spark run-time, especially for
Spark Streaming jobs in which batchDuration is quite short?
2. Some metrics like shuffle write metrics will only be updated before the
task is finished, so fetch these metrics in every 2 seconds will always get 0.
Sorry if I miss something.
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