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https://issues.apache.org/jira/browse/COUCHDB-704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12921681#action_12921681
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Filipe Manana commented on COUCHDB-704:
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Randall,
I don't see nothing wrong with the patch, but whenever the replicator can't
save a checkpoint, it retries (for remote DBs) and stops.
So I don't see exactly how you can loose 3 months of replication checkpoints.
Nevertheless, I would like to know Adam's point of view as well.
> Replication can lose checkpoints
> --------------------------------
>
> Key: COUCHDB-704
> URL: https://issues.apache.org/jira/browse/COUCHDB-704
> Project: CouchDB
> Issue Type: Bug
> Components: Replication
> Affects Versions: 0.11.2, 1.0.1
> Reporter: Randall Leeds
> Priority: Minor
> Attachments: keep_session_id.patch, save-all-rep-checkpoints.patch,
> whitespace.patch
>
> Original Estimate: 0h
> Remaining Estimate: 0h
>
> When saving replication checkpoints in the _local/<repid> document the new
> entry is always pushed onto the _original_ "history" list property that
> existed at the start of the replication. When any number of things causes the
> checkpoint to be written to only one of the databases the head of the history
> list gets out of sync. Subsequent attempts to start this replication must
> start from the latest common replication log entry in the _original_ history,
> as though this replication never occurred.
> A better idea is to push every checkpoint onto the history instead of
> replacing the head on each save.
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