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Date: Thu, 1 Oct 2009 09:39:23 -0700 (PDT)
From: "Ning Tan (JIRA)" <jira@apache.org>
To: dev@couchdb.apache.org
Subject: [jira] Updated: (COUCHDB-516) Replication: _replicate does not
 finish replication in one pass and has to be invoked repeatedly
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     [ https://issues.apache.org/jira/browse/COUCHDB-516?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ning Tan updated COUCHDB-516:
-----------------------------

    Attachment: replication.txt

Replication records and corresponding server logs.

> Replication: _replicate does not finish replication in one pass and has to be invoked repeatedly
> ------------------------------------------------------------------------------------------------
>
>                 Key: COUCHDB-516
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-516
>             Project: CouchDB
>          Issue Type: Bug
>          Components: Database Core
>    Affects Versions: 0.10
>         Environment: Mac OS X 10.5 w/ CouchDB 0.10.x multiple revisions (latest is 820436)
> Ubuntu Desktop 9.04 w/ CouchDB 0.10.x multiple revisions (latest is 818247)
>            Reporter: Ning Tan
>         Attachments: replication.txt
>
>
> When we replicate between a remote database and a local one (pulling from remote into local), we are observing partial replications, meaning that we have to issue repeated _replicate calls for the replication to complete. For a database with 17,000 documents, for example, it could take up to 7 calls for the entire database to replicate into an empty one. Each time, the number of documents replicated over seemed random.
> The use case is very simple--replicating a database into an empty one with no concurrent writes, no additional load or i/o, etc. The databases involved are a mixture of the 10.0.x code base natively built on Ubuntu and Mac.
> It seems to me that every (not all) partial replication process is associated with a corresponding entry in the log that says "recording a checkpoint at source update_seq .....". (i.e. you can match the recorded_seq number in the replication response with the checkpoint update_seq numbers in the log).
> Futon vs. curl doesn't make a difference.

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