Function replicationSendNewlineToMaster

src/replication.cpp:2318–2325

Avoid the master to detect the replica is timing out while loading the * RDB file in initial synchronization. We send a single newline character * that is valid protocol but is guaranteed to either be sent entirely or * not, since the byte is indivisible. * * The function is called in two contexts: while we flush the current * data with emptyDb(), and while we load the new data received as a

 * data with emptyDb(), and while we load the new data received as an
 * RDB file from the master. */
void replicationSendNewlineToMaster(redisMaster *mi) {
    static time_t newline_sent;
    if (time(NULL) != newline_sent) {
        newline_sent = time(NULL);
        /* Pinging back in this stage is best-effort. */
        if (mi->repl_transfer_s) connWrite(mi->repl_transfer_s, "\n", 1);
    }
}

/* Callback used by emptyDb() while flushing away old data to load
 * the new dataset received by the master. */