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From "Nathan Vander Wilt (JIRA)" <>
Subject [jira] [Commented] (COUCHDB-1874) Continuous replication slows down over time
Date Tue, 12 Nov 2013 00:27:18 GMT


Nathan Vander Wilt commented on COUCHDB-1874:

I might be seeing this with CouchDB 1.5.0 without continuous (is that likely?) replicating
a decent-sized (1.5GB) database over a consumer-grade internet connection. My replication
starts alright, gets another 25% through or so…then the replication more or less stops,
the Erlang process starts taking 150% CPU, and it starts processing all requests veeeeery

> Continuous replication slows down over time
> -------------------------------------------
>                 Key: COUCHDB-1874
>                 URL:
>             Project: CouchDB
>          Issue Type: Bug
>          Components: Replication
>            Reporter: Joan Touzet
> As reported on the mailing list:
> bq. > Did you specify "continuous": true in the replication spec?  If you did, do
you see the same slowdown if you omit that flag?
> bq. > This sounds rather similar to a bug we encountered in early builds of BigCouch,
but I don't remember the history of the codebase well enough to say whether the bug might
be latent in Apache CouchDB.
> bq. Yes, I was using "continuous": true.
> bq. You're right: When disabling "continuous", replication seems more stable and efficient
(1200 doc/sec). Thank you !
> And, from IRC:
> bq. 12:54 <+rnewson> iirc the cause we found was an unconsumed event message that
gradually fills the mailbox, which sounds like it ought to affect couchdb.

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