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From "Erik Erlandson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-24817) Implement BarrierTaskContext.barrier()
Date Thu, 02 Aug 2018 18:52:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-24817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16567358#comment-16567358
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Erik Erlandson commented on SPARK-24817:
----------------------------------------

I have been looking at the use cases for barrier-mode on the design doc. The primary story
seems to be along the lines of using {{mapPartitions}} to:
 # write out any partitioned data (and sync)
 # execute some kind of ML logic (TF, etc) (possibly syncing on stages here?)
 # optionally move back into "normal" spark executions

My mental model has been that the value proposition for Hydrogen is primarily a convergence
argument: it is easier to not have to leave a Spark workflow and execute something like TF
using some other toolchain. But OTOH, given that the Spark programmer has to write out the
partitioned data and then invoke ML tooling like TF regardless, does the increase to convenience
pay for the cost in complexity for absorbing new clustering & scheduling models into Spark,
along with other consequences, for example SPARK-24615, compared to the "null hypothesis"
of writing partition data, then using ML-specific clustering toolchains (kubeflow, for example),
and consuming the resulting products in Spark afterward.

> Implement BarrierTaskContext.barrier()
> --------------------------------------
>
>                 Key: SPARK-24817
>                 URL: https://issues.apache.org/jira/browse/SPARK-24817
>             Project: Spark
>          Issue Type: New Feature
>          Components: Spark Core
>    Affects Versions: 2.4.0
>            Reporter: Jiang Xingbo
>            Priority: Major
>
> Implement BarrierTaskContext.barrier(), to support global sync between all the tasks
in a barrier stage. The global sync shall finish immediately once all tasks in the same barrier
stage reaches the same barrier.



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