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Date: Thu, 13 Nov 2008 14:05:44 -0800 (PST)
From: "Adam Kocoloski (JIRA)" <jira@apache.org>
To: couchdb-dev@incubator.apache.org
Subject: [jira] Updated: (COUCHDB-160) replication performance improvements
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     [ https://issues.apache.org/jira/browse/COUCHDB-160?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adam Kocoloski updated COUCHDB-160:
-----------------------------------

    Attachment: couch_rep_v3.diff

forgot to increase the pipeline length in the last version.  The goal is for the entire replication to use 1 persistent connection.

> replication performance improvements
> ------------------------------------
>
>                 Key: COUCHDB-160
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-160
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: Database Core
>    Affects Versions: 0.9
>            Reporter: Adam Kocoloski
>            Priority: Minor
>         Attachments: couch_rep.erl.diff, couch_rep_v2.diff, couch_rep_v3.diff
>
>
> I wrote some code to speed up CouchDB's replication process by parallelizing document requests and using _bulk_docs to write changes to the target.  I tested the speedup as follows:
> * 1000 document DB, 1022 update_seq, ~450 KB after compaction
> * local and remote machines have ~45 ms latency
> * timed requests using timer:tc(couch_rep, replicate, [<<"source">>, <<"target">>]
> * all replications are "from scratch"
> trunk:
> local-local     115
> local-remote    145
> remote-remote   173
> remote-local    146
> db size after replication: 1.8 MB
> patch:
> local-local     1.83
> local-remote    38
> remote-remote   64
> remote-local    35
> db size after replication: 453 KB
> I'll attach the patch as an update to this issue.  It might be worth exposing the "batch size" (currently 100 docs) as a configurable parameter.  Comments welcome.  Best, 
> Adam

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