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tx throttler: remove unused topology watchers#14412

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GuptaManan100 merged 4 commits intovitessio:mainfrom
planetscale:ds-cleanup-tw
Nov 1, 2023
Merged

tx throttler: remove unused topology watchers#14412
GuptaManan100 merged 4 commits intovitessio:mainfrom
planetscale:ds-cleanup-tw

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@deepthi deepthi commented Oct 31, 2023 •
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Description

We had topology watchers in TxThrottler even though they are no longer needed or used. Healthcheck already encapsulates a topology watcher per cell. Cleaning this up in preparation for the actual work needed to fix #14277.
I have also rewritten most of the comments in healthcheck.go because a lot of them were obsolete or incorrect.

Related Issue(s)

#14277

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  • "Backport to:" labels have been added if this change should be back-ported
  • Tests were added or are not required
  • Did the new or modified tests pass consistently locally and on the CI
  • Documentation was added or is not required

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@deepthi
healthcheck: edit comments for correctness
9b04f1d 
Signed-off-by: deepthi <deepthi@planetscale.com>
@deepthi
tx_throttler: remove unused topology watchers
fecbcf5 
Signed-off-by: deepthi <deepthi@planetscale.com>
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vitess-bot bot commented Oct 31, 2023

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Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

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@vitess-bot vitess-bot bot added NeedsDescriptionUpdate The description is not clear or comprehensive enough, and needs work NeedsIssue A linked issue is missing for this Pull Request NeedsWebsiteDocsUpdate What it says labels Oct 31, 2023
@deepthi deepthi removed NeedsDescriptionUpdate The description is not clear or comprehensive enough, and needs work NeedsWebsiteDocsUpdate What it says NeedsIssue A linked issue is missing for this Pull Request labels Oct 31, 2023
@github-actions github-actions bot added this to the v19.0.0 milestone Oct 31, 2023
dbussink
dbussink reviewed Oct 31, 2023
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go/vt/vttablet/tabletserver/txthrottler/tx_throttler.go Outdated
throttlerRunning: env.Exporter().NewGauge(TxThrottlerName+"Running", "transaction throttler running state"),
topoWatchers: env.Exporter().NewGaugesWithSingleLabel(TxThrottlerName+"TopoWatchers", "transaction throttler topology watchers", "cell"),
healthChecksReadTotal: env.Exporter().NewCountersWithMultiLabels(TxThrottlerName+"HealthchecksRead", "transaction throttler healthchecks read",
topoWatchers: env.Exporter().NewGaugesWithSingleLabel(TxThrottlerName+"TopoWatchers", "DEPRECATED: transaction throttler topology watchers", "cell"), healthChecksReadTotal: env.Exporter().NewCountersWithMultiLabels(TxThrottlerName+"HealthchecksRead", "transaction throttler healthchecks read",
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@dbussink dbussink Oct 31, 2023

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Looks like a newline here was removed which makes the diff a bit confusing?

Also, what is the general value / policy around metrics deprecations? Is it useful / expected for folks to have empty metrics? Does that have value over removing the metric?

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@deepthi deepthi Oct 31, 2023

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I'll add back the newline. I went back and forth between deleting the metric versus deprecating. We need to deprecate so that people's existing metrics pipelines don't break without warning.

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@deepthi deepthi Oct 31, 2023

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I've added a line in the release notes for these.

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We need to deprecate so that people's existing metrics pipelines don't break without warning.

But doesn't a metric that flatlines break things anyway? I think it's also possible to argue that having a metric go to zero is more confusing / problematic than removing it as a signal to the user that the value is (no longer) useful? I think this is tricky anyway, we can argue both ways but I don't think this is as clear cut as say a command line flag that is deprecated?

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Honestly I don't know if anyone is even using this metric. It's not much effort to keep it deprecated and delete it in the next release, so I ended up choosing that as the "safer" approach.

@deepthi
tx_throttler: formatting
3fa9841 
Signed-off-by: deepthi <deepthi@planetscale.com>
@deepthi
release notes: document deprecated metrics
3f40609 
Signed-off-by: deepthi <deepthi@planetscale.com>
GuptaManan100
GuptaManan100 approved these changes Nov 1, 2023
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LGTM

@GuptaManan100 GuptaManan100 merged commit 3924566 into vitessio:main Nov 1, 2023
@GuptaManan100 GuptaManan100 deleted the ds-cleanup-tw branch November 1, 2023 14:00
This was referenced Nov 1, 2023
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timvaillancourt pushed a commit to slackhq/vitess that referenced this pull request May 16, 2024
@deepthi @timvaillancourt
tx throttler: remove unused topology watchers (vitessio#14412)
65333f6 
Signed-off-by: deepthi <deepthi@planetscale.com>
@timvaillancourt timvaillancourt mentioned this pull request May 16, 2024
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timvaillancourt added a commit to slackhq/vitess that referenced this pull request May 21, 2024
@timvaillancourt @Juneezee
@shlomi-noach @ejortegau @deepthi
slack-vitess-r15.0.5: backport required Transaction Throttler PRs, …
4a92ae7 
…pt. 3 + ci fixes (#351)

* txthrottler: add metrics for topoWatcher and healthCheckStreamer (vitessio#13153)

Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>

* Replace deprecated `github.com/golang/mock` with `go.uber.org/mock` (vitessio#13512)

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
Co-authored-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>

* Per workload TxThrottler metrics (vitessio#13526)

Signed-off-by: Eduardo J. Ortega U <5791035+ejortegau@users.noreply.github.com>

* tx throttler: healthcheck all cells if `--tx-throttler-healthcheck-cells` is undefined (vitessio#12477)

Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>
Co-authored-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>

* Add dry-run/monitoring-only mode for TxThrottler (vitessio#13604)

Signed-off-by: Eduardo J. Ortega U <5791035+ejortegau@users.noreply.github.com>
Signed-off-by: Eduardo J. Ortega U. <5791035+ejortegau@users.noreply.github.com>

* `txthrottler`: remove `txThrottlerConfig` struct, rely on `tabletenv` (vitessio#13624)

Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>

* tx throttler: remove unused topology watchers (vitessio#14412)

Signed-off-by: deepthi <deepthi@planetscale.com>

* tx_throttler: delete topo watcher metric instead of deprecating (vitessio#14445)

Signed-off-by: deepthi <deepthi@planetscale.com>

* TxThrottler: dont throttle unless lag (vitessio#14789)

Signed-off-by: Eduardo J. Ortega U <5791035+ejortegau@users.noreply.github.com>

* go test -v

Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>

* add mutex to flaky parseFlags()

Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>

* revert tweaks for flaky tests

Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>

* fix protojson err

Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>

* make vtadmin_web_proto_types

Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>

* remove debug t.Logf(...)

Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>

---------

Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
Signed-off-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
Signed-off-by: Eduardo J. Ortega U <5791035+ejortegau@users.noreply.github.com>
Signed-off-by: Eduardo J. Ortega U. <5791035+ejortegau@users.noreply.github.com>
Signed-off-by: deepthi <deepthi@planetscale.com>
Co-authored-by: Eng Zer Jun <engzerjun@gmail.com>
Co-authored-by: Shlomi Noach <2607934+shlomi-noach@users.noreply.github.com>
Co-authored-by: Eduardo J. Ortega U <5791035+ejortegau@users.noreply.github.com>
Co-authored-by: Deepthi Sigireddi <deepthi@planetscale.com>
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@dbussink dbussink dbussink approved these changes

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Component: Query Serving Type: Internal Cleanup

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Feature Request: Reduce number of topo calls from vtgate healthcheck

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