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From "Paul Hirst (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1874) Continuous replication slows down over time
Date Wed, 21 Aug 2013 10:50:59 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13745926#comment-13745926
] 

Paul Hirst commented on COUCHDB-1874:
-------------------------------------

+1
I've seen exactly the same problems with continuous replication. I never tried without continuous
to see if that improved things but my symptoms seem to match what's being described here.
Decent speed to start with but then gradual slow down to orders of magnitude slower in a small
number of hours.
I ended up just restarting the database every hour until my initial replication was complete.
I wish I'd just tried without continuous.
                
> Continuous replication slows down over time
> -------------------------------------------
>
>                 Key: COUCHDB-1874
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1874
>             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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