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https://issues.apache.org/jira/browse/SPARK-24136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Saisai Shao resolved SPARK-24136.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 2.4.0

Issue resolved by pull request 21207
[https://github.com/apache/spark/pull/21207]

> MemoryStreamDataReader.next should skip sleeping if record is available
> -----------------------------------------------------------------------
>
>                 Key: SPARK-24136
>                 URL: https://issues.apache.org/jira/browse/SPARK-24136
>             Project: Spark
>          Issue Type: Improvement
>          Components: Structured Streaming
>    Affects Versions: 2.4.0
>            Reporter: Arun Mahadevan
>            Priority: Minor
>             Fix For: 2.4.0
>
>
> Currently the code sleeps 10ms for each invocation of the next even if the 
> record is available.
> {code:java}
> override def next(): Boolean = {
> current = None
>  while (current.isEmpty) {
>  Thread.sleep(10)
> current = endpoint.askSync[Option[Row]](
> GetRecord(ContinuousMemoryStreamPartitionOffset(partition, currentOffset)))
>  }{code}



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