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From "Robert Newson (JIRA)" <>
Subject [jira] Created: (COUCHDB-481) Continuous replication stability issues
Date Sun, 23 Aug 2009 17:21:59 GMT
Continuous replication stability issues

                 Key: COUCHDB-481
             Project: CouchDB
          Issue Type: Bug
          Components: Database Core
    Affects Versions: 0.10
            Reporter: Robert Newson
            Priority: Blocker

I've been trying continuous replication with a different combinations of push/pull with 2,
3 and 4 nodes. I've hit several problems and discussed them on IRC with jan___ and kocolosk.

Firstly, the status page in Futon (and the output of _active_tasks) becomes inaccurate sometimes
(and does not recover). This complicates investigation of the more serious problems.

I configured a circle of four nodes with continuous pull replication and used 'ab' to write
documents to the first one. Success is for all documents to appear at all nodes. For small
batches of documents, this works. It fails, every time, with large numbers. I use batch=ok
on all requests and have not successfully run a 100k run. 

The replication task at some point in the circle eventually dumps a huge stacktrace (which
kocolosk has seen and I would need to sanitize private server names from before I could post)
and dies, and is not restarted. Worse, the client process injecting the documents also dies

I have had perfect replication runs with 2 and 3 nodes in a circle, and no successful replication
runs with 4 nodes. Using a star pattern (where each node pulls or pushes to the remaining
three) fails even more rapidly.

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