Vue · Remote · Newbie question: how should a vue-remote config file be organised?

393
VUr/vue-remote·posted by winter·2 days agoAnnouncement

Newbie question: how should a vue-remote config file be organised?

It took me two weeks of on-and-off digging and plenty of wrong turns. Writing the process down as it happened so the next person spends less time.

One last trap: in container environments remember to adjust the memory-related parameters in step. Otherwise the host limit and the process expectation disagree, and the symptom is intermittent, unreproducible failure.

The first thing was to collapse the variables. We were changing config and upgrading the version at the same time, and afterwards nobody could say which change caused what. We rolled back to moving one variable at a time, re-ran three times, and only then did the curve settle. Tedious, but not skippable.

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60 comments

60 comments

M
Wwinter·2 days ago

We have run this in production for two years without hitting it. That said, we never reached this scale, so our experience is not really evidence here.

498
Kkite·2 days ago

Thanks for sharing real numbers — far more useful than the articles that only cover concepts.

464
Aalice_dev·2 days ago

Can you give a minimal reproduction? I ran it locally for ten minutes and could not reproduce on macOS with the latest version.

413
Bbob_chen·2 days ago

Sharing our numbers, 8 cores 16GB, same scenario:

| Concurrency | P50 | P99 |
|---|---|---|
| 200 | 12ms | 88ms |
| 500 | 31ms | 340ms |

P99 clearly collapses at 500 concurrency, which lines up with your knee point.

402
Mmike_xu·2 days ago

There is actually a simpler fix that needs no architecture change: move this check up to the gateway and the problem disappears. The cost is one extra lookup at the gateway.

396
Zzhu_zong·12 minutes ago

Saved. I am reworking this area this week — this saves a lot of wrong turns.

301
Bbob_chen·5 hours ago

I just read the vue-remote source — the author actually explains the reasoning in a comment, roughly "so that it degrades into predictable behaviour in extreme cases".

30
Rrase·just now

A question: what changes in a container with a 512Mi memory limit? That is how we run it in production.

261
Rrase·5 hours ago

Agreeing with the above. One addition: with this option enabled the GC count in your metrics doubles, so adjust the alert threshold at the same time or it will keep firing.

260
Zzhou_yi·3 minutes ago

Can you give a minimal reproduction? I ran it locally for ten minutes and could not reproduce on macOS with the latest version.

226
Sslow_query·28 minutes ago

Can you give a minimal reproduction? I ran it locally for ten minutes and could not reproduce on macOS with the latest version.

225
Ddev_zhou·2 hours agoedited

Sharing our numbers, 8 cores 16GB, same scenario:

| Concurrency | P50 | P99 |
|---|---|---|
| 200 | 12ms | 88ms |
| 500 | 31ms | 340ms |

P99 clearly collapses at 500 concurrency, which lines up with your knee point.

291
Cchen_devOP·2 days ago

Thanks for sharing real numbers — far more useful than the articles that only cover concepts.

437
Aalice_dev·2 days agoedited

I see point 3 differently. The trade-off depends on your read/write ratio: read-heavy with little writing means caching actually widens the inconsistency window.

364
Kkite·2 days ago

Thanks for sharing real numbers — far more useful than the articles that only cover concepts.

420
KkiteMod·3 minutes ago

Agreeing with the above. One addition: with this option enabled the GC count in your metrics doubles, so adjust the alert threshold at the same time or it will keep firing.

454
Sslow_query·2 days ago

I just read the vue-remote source — the author actually explains the reasoning in a comment, roughly "so that it degrades into predictable behaviour in extreme cases".

293
Ttang_hao·2 days agoedited

We have run this in production for two years without hitting it. That said, we never reached this scale, so our experience is not really evidence here.

8
Ddev_zhou·2 days ago

Saved. I am reworking this area this week — this saves a lot of wrong turns.

1
Llinlin·2 days agoLevel 6

Has anyone run a controlled experiment? I did, reducing it to a single variable, and the difference was 4% — within noise. So I suspect the main cause is something else.

81
Kkite·just now

This matches what we see in production. We only hit it past 3k QPS; the earlier load tests showed nothing — the test traffic was too clean, with no long-tail requests.

1
Kkernel_panic·2 days ago

This is not a vue-remote problem, it is a usage problem. The docs say this API is not thread-safe and you must lock around it yourself.

200
LlinlinOP·2 days ago

Worth learning from this debugging approach. We went straight at the logs and took a much longer route.

44
Sswoole_lee·2 days agoedited

I just read the vue-remote source — the author actually explains the reasoning in a comment, roughly "so that it degrades into predictable behaviour in extreme cases".

3
Nnikic·2 days ago

Can you give a minimal reproduction? I ran it locally for ten minutes and could not reproduce on macOS with the latest version.

500
Cchen_dev·just now

Sharing our numbers, 8 cores 16GB, same scenario:

| Concurrency | P50 | P99 |
|---|---|---|
| 200 | 12ms | 88ms |
| 500 | 31ms | 340ms |

P99 clearly collapses at 500 concurrency, which lines up with your knee point.

1
Bbob_chen·1 hour ago

Agreeing with the above. One addition: with this option enabled the GC count in your metrics doubles, so adjust the alert threshold at the same time or it will keep firing.

16
LlinlinOP·28 minutes agoLevel 6

One counter-example: below vue-remote 7.4 the semantics of that code are different, so do not copy it verbatim. We got burned in staging and rolled back once.

206
Aalice_dev·3 minutes ago

Worth learning from this debugging approach. We went straight at the logs and took a much longer route.

116
NnikicOP·2 days agoedited

We have run this in production for two years without hitting it. That said, we never reached this scale, so our experience is not really evidence here.

162
Bbob_chen·2 days ago

Thanks for sharing real numbers — far more useful than the articles that only cover concepts.

410
Sslow_query·2 days ago

This is not a vue-remote problem, it is a usage problem. The docs say this API is not thread-safe and you must lock around it yourself.

2
Wwinter·2 days ago

One counter-example: below vue-remote 7.4 the semantics of that code are different, so do not copy it verbatim. We got burned in staging and rolled back once.

19
Oops_wang·3 minutes ago

Sharing our numbers, 8 cores 16GB, same scenario:

| Concurrency | P50 | P99 |
|---|---|---|
| 200 | 12ms | 88ms |
| 500 | 31ms | 340ms |

P99 clearly collapses at 500 concurrency, which lines up with your knee point.

3
Zzhou_yi·just now

This matches what we see in production. We only hit it past 3k QPS; the earlier load tests showed nothing — the test traffic was too clean, with no long-tail requests.

214
Mmike_xu·2 days ago

Saved. I am reworking this area this week — this saves a lot of wrong turns.

210
Ddev_zhou·2 hours ago

Worth learning from this debugging approach. We went straight at the logs and took a much longer route.

195
Rran_bo·yesterday

I see point 3 differently. The trade-off depends on your read/write ratio: read-heavy with little writing means caching actually widens the inconsistency window.

150
Lli_ming·2 days agoedited

We have run this in production for two years without hitting it. That said, we never reached this scale, so our experience is not really evidence here.

136
Bbob_chen·just now

Worth learning from this debugging approach. We went straight at the logs and took a much longer route.

96
Wwinter·2 days ago

This matches what we see in production. We only hit it past 3k QPS; the earlier load tests showed nothing — the test traffic was too clean, with no long-tail requests.

64
Ddev_zhou·2 days ago

There is actually a simpler fix that needs no architecture change: move this check up to the gateway and the problem disappears. The cost is one extra lookup at the gateway.

54
Ddev_zhou·1 hour ago

There is actually a simpler fix that needs no architecture change: move this check up to the gateway and the problem disappears. The cost is one extra lookup at the gateway.

35
Kkite·just now

There is actually a simpler fix that needs no architecture change: move this check up to the gateway and the problem disappears. The cost is one extra lookup at the gateway.

19
Llinlin·3 minutes ago

I see point 3 differently. The trade-off depends on your read/write ratio: read-heavy with little writing means caching actually widens the inconsistency window.

46
Kkernel_panic·28 minutes agoedited

This is not a vue-remote problem, it is a usage problem. The docs say this API is not thread-safe and you must lock around it yourself.

335
Lli_mingOPMod·5 hours ago

One counter-example: below vue-remote 7.4 the semantics of that code are different, so do not copy it verbatim. We got burned in staging and rolled back once.

1
Ddev_zhou·2 days ago

Has anyone run a controlled experiment? I did, reducing it to a single variable, and the difference was 4% — within noise. So I suspect the main cause is something else.

2
Sswoole_lee·2 hours ago

This is not a vue-remote problem, it is a usage problem. The docs say this API is not thread-safe and you must lock around it yourself.

143
Kkite·28 minutes ago

A question: what changes in a container with a 512Mi memory limit? That is how we run it in production.

25
Zzhou_yi·2 days ago

I just read the vue-remote source — the author actually explains the reasoning in a comment, roughly "so that it degrades into predictable behaviour in extreme cases".

2
Nnikic·2 days ago

A question: what changes in a container with a 512Mi memory limit? That is how we run it in production.

201
Aalice_dev·2 days ago

Has anyone run a controlled experiment? I did, reducing it to a single variable, and the difference was 4% — within noise. So I suspect the main cause is something else.

18
Zzhou_yi·2 days ago

Thanks for sharing real numbers — far more useful than the articles that only cover concepts.

19
Aalice_dev·2 days ago

Agreeing with the above. One addition: with this option enabled the GC count in your metrics doubles, so adjust the alert threshold at the same time or it will keep firing.

41
Bbob_chen·2 days ago

I see point 3 differently. The trade-off depends on your read/write ratio: read-heavy with little writing means caching actually widens the inconsistency window.

18
Llinlin·2 days ago

A question: what changes in a container with a 512Mi memory limit? That is how we run it in production.

17
Oops_wang·2 days ago

One counter-example: below vue-remote 7.4 the semantics of that code are different, so do not copy it verbatim. We got burned in staging and rolled back once.

5
Cchen_dev·2 hours ago

Saved. I am reworking this area this week — this saves a lot of wrong turns.

4
Kkernel_panic·just now

Has anyone run a controlled experiment? I did, reducing it to a single variable, and the difference was 4% — within noise. So I suspect the main cause is something else.

3

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