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From "Amit Sela (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-1048) Spark Runner streaming batch duration does not include duration of reading from source
Date Thu, 24 Nov 2016 14:11:58 GMT

    [ https://issues.apache.org/jira/browse/BEAM-1048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15693377#comment-15693377
] 

Amit Sela commented on BEAM-1048:
---------------------------------

To clarify - calling `rdd.count()` on the read input RDD creates a batch job each interval.
I was following "direct kafka" implementation, but in that case it's only metadata computation
as the read from Kafka is known ahead of actual read (it has a preset [start, end] offsets).

This is used for UI visibility, and feeding the {{RateController}}.
If {{RateController}} is not used, we might want to disable this for now.. (UI will lose count
visualisation too).

[~ksalant] I've assigned you since you're working on it. If resolving this prolongs, let's
open a sub-task to disable this if {{RateController}} is not used, and enable once resolved.

> Spark Runner streaming batch duration does not include duration of reading from source

> ---------------------------------------------------------------------------------------
>
>                 Key: BEAM-1048
>                 URL: https://issues.apache.org/jira/browse/BEAM-1048
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-spark
>    Affects Versions: 0.4.0-incubating
>            Reporter: Kobi Salant
>            Assignee: Kobi Salant
>
> Spark Runner streaming batch duration does not include duration of reading from source
this is because we perform rdd.count in SparkUnboundedSourcewhich that invokes a regular spark
job outside the streaming context.
> We do it for reporting the batch size both for UI and back pressure



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