[ https://issues.apache.org/jira/browse/SPARK-15429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15292908#comment-15292908 ] 

Albert Cheng edited comment on SPARK-15429 at 5/20/16 8:02 AM:
---------------------------------------------------------------

I have a idea about this issue.

First, add a new parameter 'concurrentJobs' to PIDRateEstimator.
Second, We can change the `error = latestRate - processingRate` to `error = latestRate - processingRate * concurrentJobs.toDouble`. And change the `historicalError = schedulingDelay.toDouble * processingRate / batchIntervalMillis` to `historicalError = schedulingDelay.toDouble * processingRate * concurrentJobs.toDouble / batchIntervalMillis`.

Is it right?
I would like to fix this. 


was (Author: cq365423762):
I have a idea about this issue.

First, add a new parameter `concurrentJobs` to PIDRateEstimator.
Second, We can change the `error = latestRate - processingRate` to `error = latestRate - processingRate * concurrentJobs.toDouble`. And change the `historicalError = schedulingDelay.toDouble * processingRate / batchIntervalMillis` to `historicalError = schedulingDelay.toDouble * processingRate * concurrentJobs.toDouble / batchIntervalMillis`.

Is it right?
I would like to fix this. 

> 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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org