Cloudant 10 requests per second limit

[Brendan Duddridge]

Hi,

IBM has changed their system so that it only allows for a limited number of requests per second:

• 20 Lookups/sec
• 10 Writes/sec
• 5 Queries/sec

I was wondering if there was anything in Couchbase Lite 1.4 which could throttle the number of lookups per second, writes per second and queries per second during a replication process.

Or if the too many requests response occurred, that Couchbase Lite could back off and try again a second or two later.

IBM is apparently doing everything they can to make things difficult. First the attachments issue, now this. I'm getting a lot of support requests from my customers about these issues.

Thanks,

Brendan

[Traun Leyden]

I think those limitations only apply to the free tier of IBM Cloud.

I don't know of any throttling mechanisms in Couchbase Lite along those lines though.

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[Brendan Duddridge]

Yes, that is a limitation with the free tier. But their older Cloudant service didn't have this limitation and I had a lot of customers using it. So now I'm starting to field all these support requests. Just trying to figure out what to do now and how to handle it.

[Jens Alfke]

> On Dec 5, 2017, at 12:55 PM, Brendan Duddridge <bren...@gmail.com> wrote:
>
> I was wondering if there was anything in Couchbase Lite 1.4 which could throttle the number of lookups per second, writes per second and queries per second during a replication process.

No, there’s nothing like that, because it’s never been an issue before.
(FWIW, the replicator does not run any view queries.)

—Jens

Jens Alfke — Mobile Architect — Couchbase, Inc.

[Brendan Duddridge]

Ya, I didn't think it ran any queries. But it would be good if it could handle the response code and then try again in a little bit.

[Jens Alfke]

On Dec 5, 2017, at 3:14 PM, Brendan Duddridge <bren...@gmail.com> wrote:

Ya, I didn't think it ran any queries. But it would be good if it could handle the response code and then try again in a little bit.

Sync Gateway will sometimes return a 503 if the DB server is overloaded; CBL handles that by trying again a bit later. What status code does Cloudant return?

[Brendan Duddridge]

Sync Gateway will sometimes return a 503 if the DB server is overloaded; CBL handles that by trying again a bit later. What status code does Cloudant return?

It looks like it's a 429 -- too many requests error. 

https://console.bluemix.net/docs/services/Cloudant/api/http.html#http

and from the RFC standard:

https://tools.ietf.org/html/rfc6585#page-3

[Brendan Duddridge]

Hi Jens,

Sync Gateway will sometimes return a 503 if the DB server is overloaded; CBL handles that by trying again a bit later. What status code does Cloudant return?

Where in CBL does it handle the 503 error and try again? Do you think I could just modify the code to also do the same thing with a 429 error?

Thanks,

Brendan 

[Traun Leyden]

Looks like this is the code in question:

https://github.com/couchbase/couchbase-lite-ios/blob/9a8903b9e851d5584abeec069ead4d2637b3bb91/Source/CBLMisc.m#L381

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[Brendan Duddridge]

Hi Traun,

Looks like this is the code in question:

https://github.com/couchbase/couchbase-lite-ios/blob/9a8903b9e851d5584abeec069ead4d2637b3bb91/Source/CBLMisc.m#L381

Ah excellent! I've added a check for the 429 error to tell it to return NO that's it's not a fatal error.

Now I just have to figure out the attachment size issue and then I'll be all set!

Thanks!

Brendan