implode( ', ', array_keys( $this->shutdownPositions ) ) . "\n"
);
- // CP-protected writes should overwhelmingly go to the master datacenter, so use a
- // DC-local lock to merge the values. Use a DC-local get() and a synchronous all-DC
- // set(). This makes it possible for the BagOStuff class to write in parallel to all
- // DCs with one RTT. The use of WRITE_SYNC avoids needing READ_LATEST for the get().
+ // CP-protected writes should overwhelmingly go to the master datacenter, so merge the
+ // positions with a DC-local lock, a DC-local get(), and an all-DC set() with WRITE_SYNC.
+ // If set() returns success, then any get() should be able to see the new positions.
if ( $store->lock( $this->key, 3 ) ) {
if ( $workCallback ) {
// Let the store run the work before blocking on a replication sync barrier.