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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/12/23 22:33:00 UTC
[jira] [Work logged] (BEAM-9615) [Go SDK] Beam Schemas
[ https://issues.apache.org/jira/browse/BEAM-9615?focusedWorklogId=527866&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-527866 ]
ASF GitHub Bot logged work on BEAM-9615:
----------------------------------------
Author: ASF GitHub Bot
Created on: 23/Dec/20 22:32
Start Date: 23/Dec/20 22:32
Worklog Time Spent: 10m
Work Description: lostluck opened a new pull request #13611:
URL: https://github.com/apache/beam/pull/13611
Adds "custom schema coder" support. I believe Python and Java call these providers, but that's not exactly what's happening in the Go SDK.
This PR adds the ability to register a factory function for schema coder functions for a given type. This enables overriding the default behavior for Go types in the schema coders with a custom one, for the type itself, or any matching interface.
To ensure users *can* write custom schema coders, a testing utility has been added to validate the factory functions, and ensure the coders encode to a valid schema equivalent type.
Benchmarks were added to demonstrate the umbrella helper coder functions, using a custom coder function, registering a custom coder function, and comparing to the equivalent we use for JSON encoding at present.
There are more details to work on here, but this moves everything closer to having fields of an umbrella type be encoded properly without breaking things, eg. for hanlding proto fields, which aren't encoded as proper JSON.
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 527866)
Time Spent: 18.5h (was: 18h 20m)
> [Go SDK] Beam Schemas
> ---------------------
>
> Key: BEAM-9615
> URL: https://issues.apache.org/jira/browse/BEAM-9615
> Project: Beam
> Issue Type: New Feature
> Components: sdk-go
> Reporter: Robert Burke
> Assignee: Robert Burke
> Priority: P2
> Time Spent: 18.5h
> Remaining Estimate: 0h
>
> Schema support is required for advanced cross language features in Beam, and has the opportunity to replace the current default JSON encoding of elements.
> Some quick notes, though a better fleshed out doc with details will be forthcoming:
> * All base coders should be implemented, and listed as coder capabilities. I think only stringutf8 is missing presently.
> * Should support fairly arbitrary user types, seamlessly. That is, users should be able to rely on it "just working" if their type is compatible.
> * Should support schema metadata tagging.
> In particular, one breaking shift in the default will be to explicitly fail pipelines if elements have unexported fields, when no other custom coder has been added. This has been a source of errors/dropped data/keys and a simply warning at construction time won't cut it. However, we could provide a manual "use beam schemas, but ignore unexported fields" registration as a work around.
> Edit: Doc is now at https://s.apache.org/beam-go-schemas
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