[jira] [Commented] (BEAM-12915) No parallelism when using SDFBoundedSourceReader with Flink

["Eddie Wang (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-12915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17458172#comment-17458172 ] 

Eddie Wang commented on BEAM-12915:
-----------------------------------

[~roganmorrow] were you able to get this working with `environment_type=EXTERNAL` ?

I was able to set `–experiments=pre_optimize=all` locally in LOOPBACK mode but still not getting parallelism in cluster.

> No parallelism when using SDFBoundedSourceReader with Flink
> -----------------------------------------------------------
>
>                 Key: BEAM-12915
>                 URL: https://issues.apache.org/jira/browse/BEAM-12915
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-flink
>    Affects Versions: 2.32.0
>            Reporter: Rogan Morrow
>            Priority: P2
>
> Background: I am using TFX pipelines with Flink as the runner for Beam (flink session cluster using [flink-on-k8s-operator|https://github.com/GoogleCloudPlatform/flink-on-k8s-operator]). The Flink cluster has 2 taskmanagers with 16 cores each, and parallelism is set to 32. TFX components call {{beam.io.ReadFromTFRecord}} to load data, passing in a glob file pattern. I have a dataset of TFRecords split across 160 files. When I try to run the component, processing for all 160 files ends up in a single subtask in Flink, i.e. the parallelism is effectively 1. See below images:
> !https://i.imgur.com/ppba0AL.png!
> !https://i.imgur.com/rSTFATn.png!
>  
>  I have tried all manner of Beam/Flink options and different versions of Beam/Flink but the behaviour remains the same.
> Furthermore, the behaviour affects anything that uses {{apache_beam.io.iobase.SDFBoundedSourceReader}}, e.g. {{apache_beam.io.parquetio.ReadFromParquet}} also has the same issue. Either I'm missing some obscure setting in my configuration, or this is a bug with the Flink runner.
>   



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