Nhat bf4c3642b2 remove _primary and _replica shard preferences (#26791)
The shard preference _primary, _replica and its variants were useful
for the asynchronous replication. However, with the current impl, they
are no longer useful and should be removed.

Closes #26335
2017-10-08 11:03:06 -04:00
..
2016-07-04 11:02:06 +02:00
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