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From Benoit Chesneau <bchesn...@gmail.com>
Subject Re: No heartbeat during filtered replication
Date Thu, 19 Aug 2010 21:35:11 GMT
On Thu, Aug 19, 2010 at 11:27 PM, Jason Smith <jhs@couch.io> wrote:
> Not sure if this is a bug yet so I'm running it by the list.
>
> I believe couchdb is sometimes not sending a heartbeat during _changes. For
>
>     /_changes?feed=continuous&filter=ddoc/a_filter&heartbeat=1000&since=0
>
> If the database has millions of documents but the filter only returns
> a very small number of them, considerable time will pass between
> change updates, possibly well longer than the requested heartbeat. It
> is not easy to tell whether the server or network link is down, or
> whether there is hardcore filtering action.
>
> I glanced at couch_changes.erl and keep_sending_changes/7 seems to try
> to send the entire change set to date, and only then start sending
> heartbeats after a timeout. Is this a correct assessment? If so I'll
> put it in JIRA.
> It would be nice for an AJAX client to simply specify a heartbeat and
> then setTimeout(die, heartbeat*1.1) or whatever. If the timeout fires
> before data arrives, that situation can be handled.
>
> Thanks!
>
> --
> Jason Smith
> Couchio Hosting
>

heartbeat=true ?

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