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https://issues.apache.org/jira/browse/SPARK-9966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14696928#comment-14696928
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Apache Spark commented on SPARK-9966:
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User 'tdas' has created a pull request for this issue:
https://github.com/apache/spark/pull/8199
> Handle a couple of corner cases in the PID rate estimator
> ---------------------------------------------------------
>
> Key: SPARK-9966
> URL: https://issues.apache.org/jira/browse/SPARK-9966
> Project: Spark
> Issue Type: Sub-task
> Components: Streaming
> Reporter: Tathagata Das
> Assignee: Tathagata Das
> Priority: Blocker
>
> 1. The rate estimator should not estimate any rate when there are no records
> in the batch, as there is no data to estimate the rate. In the current state,
> it estimates and set the rate to zero. That is incorrect.
> 2. The rate estimator should not never set the rate to zero under any
> circumstances. Otherwise the system will stop receiving data, and stop
> generating useful estimates (see reason 1). So the fix is to define a
> parameters that sets a lower bound on the estimated rate, so that the system
> always receives some data.
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