Continuous replication stability issues
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Key: COUCHDB-481
URL: https://issues.apache.org/jira/browse/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 sometimes.
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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