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https://issues.apache.org/jira/browse/COUCHDB-1080?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Randall Leeds updated COUCHDB-1080:
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Attachment: paranoid_checkpoint_failure_v2.patch
Thanks for the feedback, Filipe.
This version I clarified the new log message to offer a suggestion about why it
occurred as well.
The failure reason, along with the replication info, now get logged in one
place in terminate/2. It should be easy for users to match up the first error
(with suggestion about what to fix) with the replication that failed for the
same reason (logged in terminate).
No suggestion is made at error time that the replication might restart. When
the supervisor restarts the dead replication it will log that at INFO
(couch_replicator.erl#L127).
How's this look to you?
> fail fast with checkpoint conflicts
> -----------------------------------
>
> Key: COUCHDB-1080
> URL: https://issues.apache.org/jira/browse/COUCHDB-1080
> Project: CouchDB
> Issue Type: Improvement
> Components: Replication
> Affects Versions: 1.0.2
> Reporter: Randall Leeds
> Fix For: 1.1, 1.2
>
> Attachments: paranoid_checkpoint_failure.patch,
> paranoid_checkpoint_failure_v2.patch
>
>
> I've thought about this long and hard and probably should have submitted the
> bug a long time ago. I've also run this in production for months.
> When a checkpoint conflict occurs it is almost always the right thing to do
> to abort.
> If there is a rev mismatch it could mean there's are two conflicting
> (continuous and one-shot) replications between the same hosts running.
> Without reloading the history documents checkpoints will continue to fail
> forever. This could leave us in a state with many replicated changes but no
> checkpoints.
> Similarly, a successful checkpoint but a lost/timed-out response could cause
> this situation.
> Since the supervisor will restart the replication anyway, I think it's safer
> to abort and retry.
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