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Cache fake client in replicaFeedSlaves

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Former-commit-id: 8e81e5f29e718395b32a60ff263808305d0b5818
This commit is contained in:
John Sully 2020-04-13 22:45:15 -04:00
parent 4ed8f38a13
commit 8fb3be9ce1
1 changed files with 17 additions and 10 deletions
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23
src/replication.cpp
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@ -340,6 +340,8 @@ void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc) {
listIter li, liReply;
int j, len;
serverAssert(GlobalLocksAcquired());
static client *fake = nullptr;
if (dictid < 0)
dictid = 0; // this can happen if we send a PING before any real operation
@ -357,8 +359,12 @@ void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc) {
/* We can't have slaves attached and no backlog. */
serverAssert(!(listLength(slaves) != 0 && g_pserver->repl_backlog == NULL));
client *fake = createClient(-1, serverTL - g_pserver->rgthreadvar);
if (fake == nullptr)
{
fake = createClient(-1, serverTL - g_pserver->rgthreadvar);
fake->flags |= CLIENT_FORCE_REPLY;
}
bool fSendRaw = !g_pserver->fActiveReplica;
replicationFeedSlave(fake, dictid, argv, argc, fSendRaw); // Note: updates the repl log, keep above the repl update code below
@ -374,10 +380,6 @@ void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc) {
serverAssert(argc > 0);
serverAssert(cchbuf > 0);
char uuid[37];
uuid_unparse(cserver.uuid, uuid);
// The code below used to be: snprintf(proto, sizeof(proto), "*5\r\n$7\r\nRREPLAY\r\n$%d\r\n%s\r\n$%lld\r\n", (int)strlen(uuid), uuid, cchbuf);
// but that was much too slow
static const char *protoRREPLAY = "*5\r\n$7\r\nRREPLAY\r\n$36\r\n00000000-0000-0000-0000-000000000000\r\n$";
@ -385,6 +387,9 @@ void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc) {
int cchProto = 0;
if (!fSendRaw)
{
char uuid[37];
uuid_unparse(cserver.uuid, uuid);
cchProto = strlen(protoRREPLAY);
memcpy(proto, protoRREPLAY, strlen(protoRREPLAY));
memcpy(proto + 22, uuid, 36); // Note UUID_STR_LEN includes the \0 trailing byte which we don't want
@ -405,9 +410,7 @@ void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc) {
int cchMvcc = 0;
incrementMvccTstamp(); // Always increment MVCC tstamp so we're consistent with active and normal replication
if (!fSendRaw)
{
cchMvcc = writeProtoNum(szMvcc, sizeof(szMvcc), getMvccTstamp());
}
/* Write the command to the replication backlog if any. */
if (g_pserver->repl_backlog)
@ -492,7 +495,11 @@ void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc) {
}
}
freeClient(fake);
// Cleanup cached fake client output buffers
fake->bufpos = 0;
fake->sentlen = 0;
fake->reply_bytes = 0;
listEmpty(fake->reply);
}
/* This function is used in order to proxy what we receive from our master