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From "Ofir Manor (JIRA)" <>
Subject [jira] [Commented] (SPARK-17812) More granular control of starting offsets (assign)
Date Sat, 15 Oct 2016 20:26:20 GMT


Ofir Manor commented on SPARK-17812:

I think Michael suggest that if you use {{startingOffsets}} without using {assign}}, that
could work (use the topic-partition list from the startingOffsets), and would simplify the
user coding (not needing to specify two similar lists, simpler resume etc).
You could keep an explicit {{assign}} for the "more rare?" cases, if someone wants to specify
a list of topic-partitions but also earliest / latest / timestamp.

> More granular control of starting offsets (assign)
> --------------------------------------------------
>                 Key: SPARK-17812
>                 URL:
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Michael Armbrust
>            Assignee: Cody Koeninger
> Right now you can only run a Streaming Query starting from either the earliest or latests
offsets available at the moment the query is started.  Sometimes this is a lot of data.  It
would be nice to be able to do the following:
>  - seek to user specified offsets for manually specified topicpartitions
> currently agreed on plan:
> Mutually exclusive subscription options (only assign is new to this ticket)
> {noformat}
> .option("subscribe","topicFoo,topicBar")
> .option("subscribePattern","topic.*")
> .option("assign","""{"topicfoo": [0, 1],"topicbar": [0, 1]}""")
> {noformat}
> where assign can only be specified that way, no inline offsets
> Single starting position option with three mutually exclusive types of value
> {noformat}
> .option("startingOffsets", "earliest" | "latest" | """{"topicFoo": {"0": 1234, "1": -2},
"topicBar":{"0": -1}}""")
> {noformat}
> startingOffsets with json fails if any topicpartition in the assignments doesn't have
an offset.

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