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Cluster: detect nodes address change.

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This commit is contained in:
antirez 2013-06-12 10:50:07 -07:00
parent d427373f01
commit dfc98dccf4
2 changed files with 51 additions and 8 deletions
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56
src/cluster.c
View File

@ -753,9 +753,36 @@ void nodeIp2String(char *buf, clusterLink *link) {
/* Update the node address to the IP address that can be extracted
* from link->fd, and at the specified port. */
void nodeUpdateAddress(clusterNode *node, clusterLink *link, int port) {
/* TODO */
* from link->fd, and at the specified port.
* Also disconnect the node link so that we'll connect again to the new
* address.
*
* If the ip/port pair are already correct no operation is performed at
* all.
*
* The function returns 0 if the node address is still the same,
* otherwise 1 is returned. */
int nodeUpdateAddressIfNeeded(clusterNode *node, clusterLink *link, int port) {
char ip[REDIS_IP_STR_LEN];
/* We don't proceed if the link is the same as the sender link, as this
* function is designed to see if the node link is consistent with the
* symmetric link that is used to receive PINGs from the node.
*
* As a side effect this function never frees the passed 'link', so
* it is safe to call during packet processing. */
if (link == node->link) return 0;
nodeIp2String(ip,link);
if (node->port == port && strcmp(ip,node->ip) == 0) return 0;
/* IP / port is different, update it. */
memcpy(node->ip,ip,sizeof(ip));
node->port = port;
if (node->link) freeClusterLink(node->link);
redisLog(REDIS_WARNING,"Address updated for node %.40s, now %s:%d",
node->name, node->ip, node->port);
return 1;
}
/* When this function is called, there is a packet to process starting
@ -854,8 +881,14 @@ int clusterProcessPacket(clusterLink *link) {
if (sender) {
redisLog(REDIS_WARNING,
"Handshake error: we already know node %.40s, updating the address if needed.", sender->name);
nodeUpdateAddress(sender,link,ntohs(hdr->port));
freeClusterNode(link->node); /* will free the link too */
if (nodeUpdateAddressIfNeeded(sender,link,ntohs(hdr->port)))
{
clusterUpdateState();
clusterSaveConfigOrDie();
}
/* Free this node as we alrady have it. This will
* cause the link to be freed as well. */
freeClusterNode(link->node);
return 0;
}
@ -888,6 +921,15 @@ int clusterProcessPacket(clusterLink *link) {
}
}
/* Update the node address if it changed. */
if (sender && type == CLUSTERMSG_TYPE_PING &&
!(sender->flags & REDIS_NODE_HANDSHAKE) &&
nodeUpdateAddressIfNeeded(sender,link,ntohs(hdr->port)))
{
update_state = 1;
update_config = 1;
}
/* Update our info about the node */
if (link->node && type == CLUSTERMSG_TYPE_PONG) {
link->node->pong_received = time(NULL);
@ -1049,12 +1091,12 @@ int clusterProcessPacket(clusterLink *link) {
decrRefCount(message);
}
} else if (type == CLUSTERMSG_TYPE_FAILOVER_AUTH_REQUEST) {
if (!sender) return 0; /* We don't know that node. */
if (!sender) return 1; /* We don't know that node. */
/* If we are not a master, ignore that message at all. */
if (!(server.cluster->myself->flags & REDIS_NODE_MASTER)) return 0;
clusterSendFailoverAuthIfNeeded(sender);
} else if (type == CLUSTERMSG_TYPE_FAILOVER_AUTH_ACK) {
if (!sender) return 0; /* We don't know that node. */
if (!sender) return 1; /* We don't know that node. */
/* If this is a master, increment the number of acknowledges
* we received so far. */
if (sender->flags & REDIS_NODE_MASTER)

3
src/redis.h
View File

@ -120,6 +120,7 @@
#define REDIS_DEFAULT_AOF_REWRITE_INCREMENTAL_FSYNC 1
#define REDIS_DEFAULT_MIN_SLAVES_TO_WRITE 0
#define REDIS_DEFAULT_MIN_SLAVES_MAX_LAG 10
#define REDIS_IP_STR_LEN 16
/* Protocol and I/O related defines */
#define REDIS_MAX_QUERYBUF_LEN (1024*1024*1024) /* 1GB max query buffer. */
@ -606,7 +607,7 @@ struct clusterNode {
time_t ping_sent; /* Unix time we sent latest ping */
time_t pong_received; /* Unix time we received the pong */
time_t fail_time; /* Unix time when FAIL flag was set */
char ip[16]; /* Latest known IP address of this node */
char ip[REDIS_IP_STR_LEN]; /* Latest known IP address of this node */
int port; /* Latest known port of this node */
clusterLink *link; /* TCP/IP link with this node */
list *fail_reports; /* List of nodes signaling this as failing */