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Cluster: FAILOVER_AUTH_REQUEST message type introduced.

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This message is sent by a slave that is ready to failover its master to
other nodes to get the authorization from the majority of masters.
This commit is contained in:
antirez 2013-03-13 17:21:20 +01:00
parent 575cbc9990
commit db7c17e969
2 changed files with 18 additions and 0 deletions
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17
src/cluster.c
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@ -1248,6 +1248,23 @@ void clusterPropagatePublish(robj *channel, robj *message) {
* SLAVE node specific functions
* -------------------------------------------------------------------------- */
/* This function sends a FAILOVE_AUTH_REQUEST message to every node in order to
* see if there is the quorum for this slave instance to failover its failing
* master.
*
* Note that we send the failover request to everybody, master and slave nodes,
* but only the masters are supposed to reply to our query. */
void clusterRequestFailoverAuth(void) {
unsigned char buf[4096], *payload;
clusterMsg *hdr = (clusterMsg*) buf;
uint32_t totlen;
clusterBuildMessageHdr(hdr,CLUSTERMSG_TYPE_FAILOVER_AUTH_REQUEST);
totlen = sizeof(clusterMsg)-sizeof(union clusterMsgData);
hdr->totlen = htonl(totlen);
clusterBroadcastMessage(payload,totlen);
}
/* This function is called if we are a slave node and our master serving
* a non-zero amount of hash slots is in PFAIL state.
*

1
src/redis.h
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@ -594,6 +594,7 @@ typedef struct {
#define CLUSTERMSG_TYPE_MEET 2 /* Meet "let's join" message */
#define CLUSTERMSG_TYPE_FAIL 3 /* Mark node xxx as failing */
#define CLUSTERMSG_TYPE_PUBLISH 4 /* Pub/Sub Publish propagation */
#define CLUSTERMSG_TYPE_FAILOVER_AUTH_REQUEST 5 /* May I failover? */
/* Initially we don't know our "name", but we'll find it once we connect
* to the first node, using the getsockname() function. Then we'll use this