nickva opened a new pull request, #4095:
URL: https://github.com/apache/couchdb/pull/4095
`winning_revs_only` option replicates only the winning revisions from the
source to the target, effectively discarding conflicts.
This option may be used as an alternative to the custom VDU strategy, or
manual _all_docs read and POST to target scripts, often used by users to
discard conflicted document revisions.
Behind the scenes the implementation simply switches the `_changes` feed
style to `main_only` from the replication default of `all_docs`.
Additionally, when enabled, the `winning_revs_only` option, will generate a
different replication ID and use a different set of checkpoints than the
default case. This should allows first replicating with `winning_revs_only:
true`, and then later replicate normally between the same endpoints, in order
to "backfill" the rest of the revisions.
The main test is in the couch_replicator_many_leaves since we already assert
how multiple conflicting docs replicate there. The test was also simplified to
remove the `{remote, remote}` tuple as we only have remote endpoints currently.
Issue: https://github.com/apache/couchdb/issues/4034
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