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https://issues.apache.org/jira/browse/BEAM-3545?focusedWorklogId=223018&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-223018
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ASF GitHub Bot logged work on BEAM-3545:
----------------------------------------
Author: ASF GitHub Bot
Created on: 04/Apr/19 14:54
Start Date: 04/Apr/19 14:54
Worklog Time Spent: 10m
Work Description: lostluck commented on pull request #8218: [BEAM-3545]
Support Metrics in Go SDK CombineFns
URL: https://github.com/apache/beam/pull/8218#discussion_r272220652
##########
File path: sdks/go/pkg/beam/core/metrics/metrics.go
##########
@@ -82,15 +82,19 @@ func (ctx *beamCtx) Value(key interface{}) interface{} {
switch key {
case bundleKey:
if ctx.bundleID == "" {
- if id := ctx.Value(key); id != nil {
+ if id := ctx.Context.Value(key); id != nil {
Review comment:
This is where the infinite recursion was happening, using ctx.Context.Value
is the fix!
Value is a method on the context.Context interface which is ordinarily
promoted to beamCtx via embedding. But we're overriding it on beamCtx. In other
words, the Value being called was the one we're looking at, instead of the
embedded Context's Value. In short, if the value didn't exist, it would
recursively call itself forever.
As you've noted, calling ctx.Context.Value makes it explicit we want the
embedded types implementation, rather than the beamCtx.Value. There's no
benefit in this case to call beamCtx.Value since we already know this level
doesn't have the bundleID (or ptransformID).
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Issue Time Tracking
-------------------
Worklog Id: (was: 223018)
Time Spent: 10h 10m (was: 10h)
> Fn API metrics in Go SDK harness
> --------------------------------
>
> Key: BEAM-3545
> URL: https://issues.apache.org/jira/browse/BEAM-3545
> Project: Beam
> Issue Type: Sub-task
> Components: sdk-go
> Reporter: Kenneth Knowles
> Priority: Major
> Labels: portability, triaged
> Time Spent: 10h 10m
> Remaining Estimate: 0h
>
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