char *charset = "0123456789abcdef";
int j;
- if (!fp) {
- redisLog(REDIS_WARNING,
- "Unrecovarable error: can't open /dev/urandom:%s" ,strerror(errno));
- exit(1);
+ if (fp == NULL || fread(p,REDIS_CLUSTER_NAMELEN,1,fp) == 0) {
+ for (j = 0; j < REDIS_CLUSTER_NAMELEN; j++)
+ p[j] = rand();
}
- fread(p,REDIS_CLUSTER_NAMELEN,1,fp);
for (j = 0; j < REDIS_CLUSTER_NAMELEN; j++)
p[j] = charset[p[j] & 0x0F];
fclose(fp);
for (j = 7; j < argc; j++) {
int start, stop;
- if ((p = strchr(argv[j],'-')) != NULL) {
+ if (argv[j][0] == '[') {
+ /* Here we handle migrating / importing slots */
+ int slot;
+ char direction;
+ clusterNode *cn;
+
+ p = strchr(argv[j],'-');
+ redisAssert(p != NULL);
+ *p = '\0';
+ direction = p[1]; /* Either '>' or '<' */
+ slot = atoi(argv[j]+1);
+ p += 3;
+ cn = clusterLookupNode(p);
+ if (!cn) {
+ cn = createClusterNode(p,0);
+ clusterAddNode(cn);
+ }
+ if (direction == '>') {
+ server.cluster.migrating_slots_to[slot] = cn;
+ } else {
+ server.cluster.importing_slots_from[slot] = cn;
+ }
+ continue;
+ } else if ((p = strchr(argv[j],'-')) != NULL) {
*p = '\0';
start = atoi(argv[j]);
stop = atoi(p+1);
}
if (aeCreateFileEvent(server.el, server.cfd, AE_READABLE,
clusterAcceptHandler, NULL) == AE_ERR) oom("creating file event");
+ server.cluster.slots_to_keys = zslCreate();
}
/* -----------------------------------------------------------------------------
start = -1;
}
}
+
+ /* Just for MYSELF node we also dump info about slots that
+ * we are migrating to other instances or importing from other
+ * instances. */
+ if (node->flags & REDIS_NODE_MYSELF) {
+ for (j = 0; j < REDIS_CLUSTER_SLOTS; j++) {
+ if (server.cluster.migrating_slots_to[j]) {
+ ci = sdscatprintf(ci," [%d->-%.40s]",j,
+ server.cluster.migrating_slots_to[j]->name);
+ } else if (server.cluster.importing_slots_from[j]) {
+ ci = sdscatprintf(ci," [%d-<-%.40s]",j,
+ server.cluster.importing_slots_from[j]->name);
+ }
+ }
+ }
ci = sdscatlen(ci,"\n",1);
}
dictReleaseIterator(di);
clusterUpdateState();
clusterSaveConfigOrDie();
addReply(c,shared.ok);
+ } else if (!strcasecmp(c->argv[1]->ptr,"setslot") && c->argc >= 4) {
+ /* SETSLOT 10 MIGRATING <instance ID> */
+ /* SETSLOT 10 IMPORTING <instance ID> */
+ /* SETSLOT 10 STABLE */
+ long long aux;
+ unsigned int slot;
+ clusterNode *n;
+
+ if (getLongLongFromObjectOrReply(c,c->argv[2],&aux,NULL) != REDIS_OK)
+ return;
+ if (aux < 0 || aux >= REDIS_CLUSTER_SLOTS) {
+ addReplyError(c,"Slot out of range");
+ return;
+ }
+ slot = (unsigned int) aux;
+ if (server.cluster.slots[slot] != server.cluster.myself) {
+ addReplyErrorFormat(c,"I'm not the owner of hash slot %u",slot);
+ return;
+ }
+ if (!strcasecmp(c->argv[3]->ptr,"migrating") && c->argc == 5) {
+ if ((n = clusterLookupNode(c->argv[4]->ptr)) == NULL) {
+ addReplyErrorFormat(c,"I don't know about node %s",
+ (char*)c->argv[4]->ptr);
+ return;
+ }
+ server.cluster.migrating_slots_to[slot] = n;
+ } else if (!strcasecmp(c->argv[3]->ptr,"importing") && c->argc == 5) {
+ if ((n = clusterLookupNode(c->argv[4]->ptr)) == NULL) {
+ addReplyErrorFormat(c,"I don't know about node %s",
+ (char*)c->argv[3]->ptr);
+ return;
+ }
+ server.cluster.importing_slots_from[slot] = n;
+ } else if (!strcasecmp(c->argv[3]->ptr,"stable") && c->argc == 4) {
+ server.cluster.importing_slots_from[slot] = NULL;
+ } else {
+ addReplyError(c,"Invalid CLUSTER SETSLOT action or number of arguments");
+ }
+ clusterSaveConfigOrDie();
+ addReply(c,shared.ok);
} else if (!strcasecmp(c->argv[1]->ptr,"info") && c->argc == 2) {
char *statestr[] = {"ok","fail","needhelp"};
int slots_assigned = 0, slots_ok = 0, slots_pfail = 0, slots_fail = 0;
(unsigned long)sdslen(info)));
addReplySds(c,info);
addReply(c,shared.crlf);
+ } else if (!strcasecmp(c->argv[1]->ptr,"keyslot") && c->argc == 3) {
+ sds key = c->argv[2]->ptr;
+
+ addReplyLongLong(c,keyHashSlot(key,sdslen(key)));
+ } else if (!strcasecmp(c->argv[1]->ptr,"getkeysinslot") && c->argc == 4) {
+ long long maxkeys, slot;
+ unsigned int numkeys, j;
+ robj **keys;
+
+ if (getLongLongFromObjectOrReply(c,c->argv[2],&slot,NULL) != REDIS_OK)
+ return;
+ if (getLongLongFromObjectOrReply(c,c->argv[3],&maxkeys,NULL) != REDIS_OK)
+ return;
+ if (slot < 0 || slot >= REDIS_CLUSTER_SLOTS || maxkeys < 0 ||
+ maxkeys > 1024*1024) {
+ addReplyError(c,"Invalid slot or number of keys");
+ return;
+ }
+
+ keys = zmalloc(sizeof(robj*)*maxkeys);
+ numkeys = GetKeysInSlot(slot, keys, maxkeys);
+ addReplyMultiBulkLen(c,numkeys);
+ for (j = 0; j < numkeys; j++) addReplyBulk(c,keys[j]);
+ zfree(keys);
} else {
addReplyError(c,"Wrong CLUSTER subcommand or number of arguments");
}
/* Return the pointer to the cluster node that is able to serve the query
* as all the keys belong to hash slots for which the node is in charge.
*
- * If keys in query spawn multiple nodes NULL is returned. */
-clusterNode *getNodeByQuery(redisClient *c, struct redisCommand *cmd, robj **argv, int argc, int *hashslot) {
+ * If the returned node should be used only for this request, the *ask
+ * integer is set to '1', otherwise to '0'. This is used in order to
+ * let the caller know if we should reply with -MOVED or with -ASK.
+ *
+ * If the request contains more than a single key NULL is returned,
+ * however a request with more then a key argument where the key is always
+ * the same is valid, like in: RPOPLPUSH mylist mylist.*/
+clusterNode *getNodeByQuery(redisClient *c, struct redisCommand *cmd, robj **argv, int argc, int *hashslot, int *ask) {
clusterNode *n = NULL;
+ robj *firstkey = NULL;
multiState *ms, _ms;
multiCmd mc;
- int i;
+ int i, slot = 0;
/* We handle all the cases as if they were EXEC commands, so we have
* a common code path for everything */
if (!(c->flags & REDIS_MULTI)) return server.cluster.myself;
ms = &c->mstate;
} else {
- /* Create a fake Multi State structure, with just one command */
+ /* In order to have a single codepath create a fake Multi State
+ * structure if the client is not in MULTI/EXEC state, this way
+ * we have a single codepath below. */
ms = &_ms;
_ms.commands = &mc;
_ms.count = 1;
mc.cmd = cmd;
}
+ /* Check that all the keys are the same key, and get the slot and
+ * node for this key. */
for (i = 0; i < ms->count; i++) {
struct redisCommand *mcmd;
robj **margv;
keyindex = getKeysFromCommand(mcmd,margv,margc,&numkeys,
REDIS_GETKEYS_PRELOAD);
for (j = 0; j < numkeys; j++) {
- int slot = keyHashSlot((char*)margv[keyindex[j]]->ptr,
- sdslen(margv[keyindex[j]]->ptr));
- struct clusterNode *slotnode;
-
- slotnode = server.cluster.slots[slot];
- if (hashslot) *hashslot = slot;
- /* Node not assigned? (Should never happen actually
- * if we reached this function).
- * Different node than the previous one?
- * Return NULL, the cluster can't serve multi-node requests */
- if (slotnode == NULL || (n && slotnode != n)) {
- getKeysFreeResult(keyindex);
- return NULL;
+ if (firstkey == NULL) {
+ /* This is the first key we see. Check what is the slot
+ * and node. */
+ firstkey = margv[keyindex[j]];
+
+ slot = keyHashSlot((char*)firstkey->ptr, sdslen(firstkey->ptr));
+ n = server.cluster.slots[slot];
+ redisAssert(n != NULL);
} else {
- n = slotnode;
+ /* If it is not the first key, make sure it is exactly
+ * the same key as the first we saw. */
+ if (!equalStringObjects(firstkey,margv[keyindex[j]])) {
+ decrRefCount(firstkey);
+ getKeysFreeResult(keyindex);
+ return NULL;
+ }
}
}
getKeysFreeResult(keyindex);
}
- return (n == NULL) ? server.cluster.myself : n;
+ if (ask) *ask = 0; /* This is the default. Set to 1 if needed later. */
+ /* No key at all in command? then we can serve the request
+ * without redirections. */
+ if (n == NULL) return server.cluster.myself;
+ if (hashslot) *hashslot = slot;
+ /* This request is about a slot we are migrating into another instance?
+ * Then we need to check if we have the key. If we have it we can reply.
+ * If instead is a new key, we pass the request to the node that is
+ * receiving the slot. */
+ if (n == server.cluster.myself &&
+ server.cluster.migrating_slots_to[slot] != NULL)
+ {
+ if (lookupKeyRead(&server.db[0],firstkey) == NULL) {
+ if (ask) *ask = 1;
+ return server.cluster.migrating_slots_to[slot];
+ }
+ }
+ /* Handle the case in which we are receiving this hash slot from
+ * another instance, so we'll accept the query even if in the table
+ * it is assigned to a different node. */
+ if (server.cluster.importing_slots_from[slot] != NULL)
+ return server.cluster.myself;
+ /* It's not a -ASK case. Base case: just return the right node. */
+ return n;
}
projects / redis.git / blobdiff