mirror of
https://github.com/fluencelabs/redis
synced 2025-03-18 08:30:51 +00:00
Cluster Manager: avoid using reply error messages to check slot status.
Slot assignment status is now checked by using CLUSTER SLOTS. Furthermore, one memory leak has been fixed.
This commit is contained in:
artix
parent
129f2d2746
commit
d935cfcb89
136
src/redis-cli.c
136
src/redis-cli.c
@ -1933,7 +1933,8 @@ static dictType clusterManagerDictType = {
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};
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typedef int clusterManagerCommandProc(int argc, char **argv);
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typedef int (*clusterManagerOnReplyError)(redisReply *reply, int bulk_idx);
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typedef int (*clusterManagerOnReplyError)(redisReply *reply,
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clusterManagerNode *n, int bulk_idx);
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/* Cluster Manager helper functions */
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@ -2196,7 +2197,7 @@ static int clusterManagerCheckRedisReply(clusterManagerNode *n,
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return 1;
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}
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/* Execute MULTI command on a cluster node. */
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/* Call MULTI command on a cluster node. */
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static int clusterManagerStartTransaction(clusterManagerNode *node) {
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redisReply *reply = CLUSTER_MANAGER_COMMAND(node, "MULTI");
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int success = clusterManagerCheckRedisReply(node, reply, NULL);
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@ -2204,7 +2205,7 @@ static int clusterManagerStartTransaction(clusterManagerNode *node) {
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return success;
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}
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/* Execute EXEC command on a cluster node. */
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/* Call EXEC command on a cluster node. */
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static int clusterManagerExecTransaction(clusterManagerNode *node,
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clusterManagerOnReplyError onerror)
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{
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@ -2220,7 +2221,7 @@ static int clusterManagerExecTransaction(clusterManagerNode *node,
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redisReply *r = reply->element[i];
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char *err = NULL;
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success = clusterManagerCheckRedisReply(node, r, &err);
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if (!success && onerror) success = onerror(r, i);
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if (!success && onerror) success = onerror(r, node, i);
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if (err) {
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if (!success)
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CLUSTER_MANAGER_PRINT_REPLY_ERROR(node, err);
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@ -2768,6 +2769,55 @@ cleanup:
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return success;
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}
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/* Get the node the slot is assigned to from the point of view of node *n.
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* If the slot is unassigned or if the reply is an error, return NULL.
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* Use the **err argument in order to check wether the slot is unassigned
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* or the reply resulted in an error. */
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static clusterManagerNode *clusterManagerGetSlotOwner(clusterManagerNode *n,
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int slot, char **err)
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{
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assert(slot >= 0 && slot < CLUSTER_MANAGER_SLOTS);
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clusterManagerNode *owner = NULL;
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redisReply *reply = CLUSTER_MANAGER_COMMAND(n, "CLUSTER SLOTS");
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if (clusterManagerCheckRedisReply(n, reply, err)) {
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assert(reply->type == REDIS_REPLY_ARRAY);
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size_t i;
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for (i = 0; i < reply->elements; i++) {
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redisReply *r = reply->element[i];
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assert(r->type == REDIS_REPLY_ARRAY && r->elements >= 3);
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int from, to;
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from = r->element[0]->integer;
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to = r->element[1]->integer;
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if (slot < from || slot > to) continue;
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redisReply *nr = r->element[2];
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assert(nr->type == REDIS_REPLY_ARRAY && nr->elements >= 2);
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char *name = NULL;
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if (nr->elements >= 3)
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name = nr->element[2]->str;
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if (name != NULL)
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owner = clusterManagerNodeByName(name);
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else {
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char *ip = nr->element[0]->str;
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assert(ip != NULL);
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int port = (int) nr->element[1]->integer;
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listIter li;
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listNode *ln;
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listRewind(cluster_manager.nodes, &li);
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while ((ln = listNext(&li)) != NULL) {
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clusterManagerNode *nd = ln->value;
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if (strcmp(nd->ip, ip) == 0 && port == nd->port) {
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owner = nd;
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break;
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}
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}
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}
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if (owner) break;
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}
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}
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if (reply) freeReplyObject(reply);
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return owner;
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}
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/* Set slot status to "importing" or "migrating" */
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static int clusterManagerSetSlot(clusterManagerNode *node1,
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clusterManagerNode *node2,
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@ -2808,8 +2858,19 @@ static int clusterManagerDelSlot(clusterManagerNode *node, int slot,
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char *err = NULL;
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int success = clusterManagerCheckRedisReply(node, reply, &err);
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if (!success && reply && reply->type == REDIS_REPLY_ERROR &&
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ignore_unassigned_err &&
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strstr(reply->str, "already unassigned") != NULL) success = 1;
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ignore_unassigned_err)
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{
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char *get_owner_err = NULL;
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clusterManagerNode *assigned_to =
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clusterManagerGetSlotOwner(node, slot, &get_owner_err);
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if (!assigned_to) {
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if (get_owner_err == NULL) success = 1;
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else {
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CLUSTER_MANAGER_PRINT_REPLY_ERROR(node, get_owner_err);
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zfree(get_owner_err);
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}
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}
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}
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if (!success && err != NULL) {
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CLUSTER_MANAGER_PRINT_REPLY_ERROR(node, err);
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zfree(err);
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@ -2845,12 +2906,16 @@ static int clusterManagerBumpEpoch(clusterManagerNode *node) {
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return success;
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}
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static int clusterManagerIgnoreUnassignedErr(redisReply *reply, int bulk_idx) {
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if (bulk_idx == 0 && reply) {
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if (reply->type == REDIS_REPLY_ERROR)
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return strstr(reply->str, "already unassigned") != NULL;
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}
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return 0;
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/* Callback used by clusterManagerSetSlotOwner transaction. It should ignore
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* errors except for ADDSLOTS errors.
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* Return 1 if the error should be ignored. */
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static int clusterManagerOnSetOwnerErr(redisReply *reply,
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clusterManagerNode *n, int bulk_idx)
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{
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UNUSED(reply);
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UNUSED(n);
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/* Only raise error when ADDSLOTS fail (bulk_idx == 1). */
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return (bulk_idx != 1);
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}
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static int clusterManagerSetSlotOwner(clusterManagerNode *owner,
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@ -2865,8 +2930,7 @@ static int clusterManagerSetSlotOwner(clusterManagerNode *owner,
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clusterManagerAddSlot(owner, slot);
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if (do_clear) clusterManagerClearSlotStatus(owner, slot);
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clusterManagerBumpEpoch(owner);
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success = clusterManagerExecTransaction(owner,
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clusterManagerIgnoreUnassignedErr);
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success = clusterManagerExecTransaction(owner, clusterManagerOnSetOwnerErr);
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return success;
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}
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@ -2950,8 +3014,8 @@ static int clusterManagerMigrateKeysInSlot(clusterManagerNode *source,
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char **err)
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{
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int success = 1;
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int replace_existing_keys = (config.cluster_manager_command.flags &
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(CLUSTER_MANAGER_CMD_FLAG_FIX | CLUSTER_MANAGER_CMD_FLAG_REPLACE));
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int retry = (config.cluster_manager_command.flags &
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(CLUSTER_MANAGER_CMD_FLAG_FIX | CLUSTER_MANAGER_CMD_FLAG_REPLACE));
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while (1) {
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char *dots = NULL;
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redisReply *reply = NULL, *migrate_reply = NULL;
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@ -2983,16 +3047,35 @@ static int clusterManagerMigrateKeysInSlot(clusterManagerNode *source,
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if (migrate_reply == NULL) goto next;
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if (migrate_reply->type == REDIS_REPLY_ERROR) {
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int is_busy = strstr(migrate_reply->str, "BUSYKEY") != NULL;
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int not_served = strstr(migrate_reply->str, "slot not served") != NULL;
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if (replace_existing_keys && (is_busy || not_served)) {
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int not_served = 0;
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if (!is_busy) {
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char *get_owner_err = NULL;
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clusterManagerNode *served_by =
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clusterManagerGetSlotOwner(source, slot, &get_owner_err);
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if (!served_by) {
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if (get_owner_err == NULL) not_served = 1;
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else {
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CLUSTER_MANAGER_PRINT_REPLY_ERROR(source,
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get_owner_err);
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zfree(get_owner_err);
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}
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}
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}
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if (retry && (is_busy || not_served)) {
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/* If the key already exists, try to migrate keys
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* adding REPLACE option.
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* If the key's slot is not served, try to assign slot
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* to the target node. */
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if (not_served)
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if (not_served) {
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clusterManagerLogWarn("*** Slot was not served, setting "
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"owner to node %s:%d.\n",
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target->ip, target->port);
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clusterManagerSetSlot(source, target, slot, "node", NULL);
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clusterManagerLogWarn("*** Target key exists. "
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"Replacing it for FIX.\n");
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}
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if (is_busy) {
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clusterManagerLogWarn("*** Target key exists. "
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"Replacing it for FIX.\n");
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}
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freeReplyObject(migrate_reply);
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migrate_reply = clusterManagerMigrateKeysInReply(source,
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target,
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@ -4252,7 +4335,7 @@ static int clusterManagerCheckCluster(int quiet) {
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n->port);
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for (i = 0; i < n->migrating_count; i += 2) {
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sds slot = n->migrating[i];
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dictAdd(open_slots, slot, sdsdup(n->migrating[i + 1]));
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dictReplace(open_slots, slot, sdsdup(n->migrating[i + 1]));
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char *fmt = (i > 0 ? ",%S" : "%S");
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errstr = sdscatfmt(errstr, fmt, slot);
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}
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@ -4270,7 +4353,7 @@ static int clusterManagerCheckCluster(int quiet) {
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n->port);
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for (i = 0; i < n->importing_count; i += 2) {
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sds slot = n->importing[i];
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dictAdd(open_slots, slot, sdsdup(n->importing[i + 1]));
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dictReplace(open_slots, slot, sdsdup(n->importing[i + 1]));
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char *fmt = (i > 0 ? ",%S" : "%S");
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errstr = sdscatfmt(errstr, fmt, slot);
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}
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@ -4333,7 +4416,7 @@ static int clusterManagerCheckCluster(int quiet) {
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/* Check whether there are multiple owners, even when slots are
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* fully covered and there are no open slots. */
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clusterManagerLogInfo(">>> Check for multiple slot owners...\n");
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int slot = 0;
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int slot = 0, slots_with_multiple_owners = 0;
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for (; slot < CLUSTER_MANAGER_SLOTS; slot++) {
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listIter li;
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listNode *ln;
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@ -4359,6 +4442,7 @@ static int clusterManagerCheckCluster(int quiet) {
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clusterManagerNode *n = ln->value;
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clusterManagerLogErr(" %s:%d\n", n->ip, n->port);
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}
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slots_with_multiple_owners++;
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if (do_fix) {
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result = clusterManagerFixMultipleSlotOwners(slot, owners);
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if (!result) {
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@ -4366,11 +4450,13 @@ static int clusterManagerCheckCluster(int quiet) {
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"for slot %d\n", slot);
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listRelease(owners);
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break;
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}
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} else slots_with_multiple_owners--;
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}
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}
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listRelease(owners);
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}
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if (slots_with_multiple_owners == 0)
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clusterManagerLogOk("[OK] No multiple owners found.\n");
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}
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return result;
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}
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