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Posted to notifications@couchdb.apache.org by "Nick Vatamaniuc (JIRA)" <ji...@apache.org> on 2016/08/29 20:24:20 UTC
[jira] [Commented] (COUCHDB-3111) Default replicator change feed
timeout too short
[ https://issues.apache.org/jira/browse/COUCHDB-3111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15446957#comment-15446957 ]
Nick Vatamaniuc commented on COUCHDB-3111:
------------------------------------------
For reference here is an example of a change feed request :
{code} GET /rdyno_0000001/_changes?filter=rdyno_filterdoc%2Frdyno_filtername&feed=continuous&style=all_docs&since=%22334-g1AAAAIieJyV0MENgjAUgOGnmKAnR9AJjG2RlpPcHENbHg0SxJNn3UQ30U10EyzUBAkhgTRpk7b_d3gZAEwTB2GenzEmIaF8tTaLZOZhLEEtiqJIE0e6J3PhKqEiLfz2905CLc2utj8FKoUTuqGaIswuOcb6mMfY3Ydlv2_0WiqfR9ivP5T9tdFLznxNvF59PjE73MxhiHttIGFCoxhgPKzxrA0aKCLQH2C8rPH-nwX1Auw3S2t8rFHOQwGMdhXDNPOQYztMv-12jrg%22&timeout=10000 {code}
> Default replicator change feed timeout too short
> ------------------------------------------------
>
> Key: COUCHDB-3111
> URL: https://issues.apache.org/jira/browse/COUCHDB-3111
> Project: CouchDB
> Issue Type: Improvement
> Reporter: Nick Vatamaniuc
>
> Current replicator change feeds are set up to timeout based on default connection_timeout parameter divided by 3. Default connection timeout is 30000 (msec). So replicator change feeds are torn down and established again every 10 seconds.
> That doesn't seem bad on a smaller scale but if there are 1000 replications jobs on a server it would means tearing down change feed connections every 10 msec. It seems like it might not be optimal so wanted to discuss it.
> Looking at the commit which introduced 'div 3' behavior wondering if there is anything to improve here:
> https://github.com/apache/couchdb-couch-replicator/commit/ed447f8c01880c7f99f5829a8ef485fd8d399376
> Maybe keep div 3 but increase default connection timeout to 60 seconds? Or maybe apply div 2 - 5 seconds, or have a minimum of 30 seconds?
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