Fix issue #143

Former-commit-id: 6ec1641294b23e22a2a5dc5cc6098a02ce234df3

src/networking.cpp

@@ -496,7 +496,7 @@ void addReplyErrorLengthCore(client *c, const char *s, size_t len, bool fAsync)
 
         if (c->querybuf && sdslen(c->querybuf)) {
             std::string str = escapeString(c->querybuf);
-            serverLog(LL_WARNING, "\tquerybuf: %s", str.c_str());
+            printf("\tquerybuf: %s\n", str.c_str());
         }
         c->master_error = 1;
     }

src/replication.cpp

@@ -2425,8 +2425,6 @@ void freeMasterInfo(redisMaster *mi)
 {
     zfree(mi->masterauth);
     zfree(mi->masteruser);
-    if (mi->clientFake)
-        freeClient(mi->clientFake);
     delete mi->staleKeyMap;
     zfree(mi);
 }
@@ -2484,11 +2482,6 @@ void replicationHandleMasterDisconnection(redisMaster *mi) {
         mi->master = NULL;
         mi->repl_state = REPL_STATE_CONNECT;
         mi->repl_down_since = g_pserver->unixtime;
-        if (mi->clientFake) {
-            freeClient(mi->clientFake);
-            mi->clientFake = nullptr;
-
-        }
         /* We lost connection with our master, don't disconnect slaves yet,
         * maybe we'll be able to PSYNC with our master later. We'll disconnect
         * the slaves only if we'll have to do a full resync with our master. */
@@ -3378,8 +3371,13 @@ bool FInReplicaReplay()
     return s_pstate != nullptr && s_pstate->nesting() > 0;
 }
 
+struct RemoteMasterState
+{
+    uint64_t mvcc = 0;
+    client *cFake = nullptr;
+};
 
-static std::unordered_map<std::string, uint64_t> g_mapmvcc;
+static std::unordered_map<std::string, RemoteMasterState> g_mapremote;
 
 void replicaReplayCommand(client *c)
 {
@@ -3455,12 +3453,15 @@ void replicaReplayCommand(client *c)
     if (!s_pstate->FPush())
         return;
 
-    redisMaster *mi = s_pstate->getMi(c);
-    client *cFake = mi->clientFake;
-    if (mi->clientFakeNesting != s_pstate->nesting())
-        cFake = nullptr;
-    serverAssert(mi != nullptr);
-    if (mvcc != 0 && g_mapmvcc[uuid] >= mvcc)
+    RemoteMasterState &remoteState = g_mapremote[uuid];
+    if (remoteState.cFake == nullptr)
+        remoteState.cFake = createClient(-1, c->iel);
+    else
+        remoteState.cFake->iel = c->iel;
+
+    client *cFake = remoteState.cFake;
+
+    if (mvcc != 0 && remoteState.mvcc >= mvcc)
     {
         s_pstate->Cancel();
         s_pstate->Pop();
@@ -3469,8 +3470,6 @@ void replicaReplayCommand(client *c)
 
     // OK We've recieved a command lets execute
     client *current_clientSave = serverTL->current_client;
-    if (cFake == nullptr)
-        cFake = createClient(-1, c->iel);
     cFake->lock.lock();
     cFake->authenticated = c->authenticated;
     cFake->puser = c->puser;
@@ -3483,13 +3482,15 @@ void replicaReplayCommand(client *c)
     bool fExec = ccmdPrev != serverTL->commandsExecuted;
     cFake->lock.unlock();
     if (cFake->master_error)
-        addReplyError(c, "Error in rreplay command, please check logs");
+    {
+        addReplyError(c, "Error in rreplay command, please check logs.");
+    }
     if (fExec || cFake->flags & CLIENT_MULTI)
     {
         addReply(c, shared.ok);
         selectDb(c, cFake->db->id);
-        if (mvcc > g_mapmvcc[uuid])
-            g_mapmvcc[uuid] = mvcc;
+        if (mvcc > remoteState.mvcc)
+            remoteState.mvcc = mvcc;
     }
     else
     {
@@ -3497,17 +3498,6 @@ void replicaReplayCommand(client *c)
         addReplyError(c, "command did not execute");
     }
     serverAssert(sdslen(cFake->querybuf) == 0);
-    if (cFake->flags & CLIENT_MULTI)
-    {
-        mi->clientFake = cFake;
-        mi->clientFakeNesting = s_pstate->nesting();
-    }
-    else
-    {
-        if (mi->clientFake == cFake)
-            mi->clientFake = nullptr;
-        freeClient(cFake);
-    }
     serverTL->current_client = current_clientSave;
 
     // call() will not propogate this for us, so we do so here

src/server.cpp

@@ -3593,12 +3593,12 @@ int processCommand(client *c, int callFlags) {
             return C_OK;
         }
     }
-
-    incrementMvccTstamp();
     
     if (!locker.isArmed())
         locker.arm(c);
 
+    incrementMvccTstamp();
+
     /* Handle the maxmemory directive.
      *
      * Note that we do not want to reclaim memory if we are here re-entering
@@ -5018,14 +5018,15 @@ void incrementMvccTstamp()
     msPrev >>= MVCC_MS_SHIFT;  // convert to milliseconds
 
     long long mst;
-    __atomic_load(&g_pserver->mstime, &mst, __ATOMIC_RELAXED);
+    __atomic_load(&g_pserver->mstime, &mst, __ATOMIC_ACQUIRE);
     if (msPrev >= (uint64_t)mst)  // we can be greater if the count overflows
     {
-        atomicIncr(g_pserver->mvcc_tstamp, 1);
+        __atomic_fetch_add(&g_pserver->mvcc_tstamp, 1, __ATOMIC_RELEASE);
     }
     else
     {
-        atomicSet(g_pserver->mvcc_tstamp, ((uint64_t)g_pserver->mstime) << MVCC_MS_SHIFT);
+        uint64_t val = ((uint64_t)g_pserver->mstime) << MVCC_MS_SHIFT;
+        __atomic_store(&g_pserver->mvcc_tstamp, &val, __ATOMIC_RELEASE);
     }
 }
 

src/server.h

@@ -1541,8 +1541,6 @@ struct redisMaster {
     int masterport;                 /* Port of master */
     client *cached_master;          /* Cached master to be reused for PSYNC. */
     client *master;
-    client *clientFake;
-    int clientFakeNesting;
     /* The following two fields is where we store master PSYNC replid/offset
      * while the PSYNC is in progress. At the end we'll copy the fields into
      * the server->master client structure. */