[jira] [Resolved] (BEAM-579) Integrate NamedAggregators into Spark's sink system

["Amit Sela (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-579?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Amit Sela resolved BEAM-579.
----------------------------
       Resolution: Fixed
    Fix Version/s: 0.3.0-incubating

Resolved by Stas Levin PR#867.

> Integrate NamedAggregators into Spark's sink system
> ---------------------------------------------------
>
>                 Key: BEAM-579
>                 URL: https://issues.apache.org/jira/browse/BEAM-579
>             Project: Beam
>          Issue Type: Task
>          Components: runner-spark
>            Reporter: Stas Levin
>            Assignee: Amit Sela
>             Fix For: 0.3.0-incubating
>
>
> At the moment {{NamedAggregators}} is an adapter between Beam's {{Aggregator}} and Spark's {{Accumulator}} and is implemented as a single Spark {{Accumulator}}, holding a map of metrics that can be augmented with new metrics dynamically, after the the pipeline has already started. 
> Spark's out-of-the-box metrics mechanism does not support adding metrics to {{Source}} s that have already registered (it pulls their metrics upon registration and never updates them again).
> In light of the above, it would seem that there is a gap to bridge between the dynamic nature of {{NamedAggregators}} and Spark's current metric system so that metrics that are added dynamically are also reported to the defined Spark {{Sink}} s.



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