[jira] [Commented] (BEAM-53) PubSubIO: reimplement in Java

["Daniel Halperin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-53?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15174266#comment-15174266 ] 

Daniel Halperin commented on BEAM-53:
-------------------------------------

This BEAM issue subsumes https://github.com/GoogleCloudPlatform/DataflowJavaSDK/issues/37]

> PubSubIO: reimplement in Java
> -----------------------------
>
>                 Key: BEAM-53
>                 URL: https://issues.apache.org/jira/browse/BEAM-53
>             Project: Beam
>          Issue Type: New Feature
>          Components: sdk-java-gcp
>            Reporter: Daniel Halperin
>            Priority: Minor
>
> PubSubIO is currently only partially implemented in Java: the DirectPipelineRunner uses a non-scalable API in a single-threaded manner.
> In contrast, the DataflowPipelineRunner uses an entirely different code path implemented in the Google Cloud Dataflow service.
> We need to reimplement PubSubIO in Java in order to support other runners in a scalable way.
> Additionally, we can take this opportunity to add new features:
> * getting timestamp from an arbitrary lambda in arbitrary formats rather than from a message attribute in only 2 formats.
> * exposing metadata and attributes in the elements produced by PubSubIO.Read
> * setting metadata and attributes in the messages written by PubSubIO.Write



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