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From "Albert Cheng (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-15429) When `spark.streaming.concurrentJobs > 1`, PIDRateEstimator cannot estimate the receiving rate accurately.
Date Fri, 20 May 2016 04:19:12 GMT
Albert Cheng created SPARK-15429:
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             Summary: When `spark.streaming.concurrentJobs > 1`, PIDRateEstimator cannot
estimate the receiving rate accurately.
                 Key: SPARK-15429
                 URL: https://issues.apache.org/jira/browse/SPARK-15429
             Project: Spark
          Issue Type: Bug
          Components: Streaming
    Affects Versions: 1.6.1
            Reporter: Albert Cheng


When `spark.streaming.concurrentJobs > 1`, PIDRateEstimator cannot estimate the receiving
rate accurately.

For example, if the batch duration is set to 10 seconds, each rdd in the dstream will take
20s to compute. By changing `spark.streaming.concurrentJobs=2`, each rdd in the dstream still
takes 20s to consume the data, which leads to poor estimation of backpressure by PIDRateEstimator.




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