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Cluster: mark cluster state as fail of majority of masters is unreachable.

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This commit is contained in:
antirez 2013-03-07 15:36:59 +01:00
parent abf06fd5ff
commit 299b8f76c2
1 changed files with 19 additions and 2 deletions
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21
src/cluster.c
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@ -1451,6 +1451,7 @@ int clusterDelSlot(int slot) {
* -------------------------------------------------------------------------- */ * -------------------------------------------------------------------------- */
void clusterUpdateState(void) { void clusterUpdateState(void) {
int j, initial_state = server.cluster->state; int j, initial_state = server.cluster->state;
int unreachable_masters = 0;
/* Start assuming the state is OK. We'll turn it into FAIL if there /* Start assuming the state is OK. We'll turn it into FAIL if there
* are the right conditions. */ * are the right conditions. */
@ -1467,7 +1468,10 @@ void clusterUpdateState(void) {
} }
/* Compute the cluster size, that is the number of master nodes /* Compute the cluster size, that is the number of master nodes
* serving at least a single slot. */ * serving at least a single slot.
*
* At the same time count the number of unreachable masters with
* at least one node. */
{ {
dictIterator *di; dictIterator *di;
dictEntry *de; dictEntry *de;
@ -1477,12 +1481,25 @@ void clusterUpdateState(void) {
while((de = dictNext(di)) != NULL) { while((de = dictNext(di)) != NULL) {
clusterNode *node = dictGetVal(de); clusterNode *node = dictGetVal(de);
if (node->flags & REDIS_NODE_MASTER && node->numslots) if (node->flags & REDIS_NODE_MASTER && node->numslots) {
server.cluster->size++; server.cluster->size++;
if (node->flags & (REDIS_NODE_FAIL|REDIS_NODE_PFAIL))
unreachable_masters++;
}
} }
dictReleaseIterator(di); dictReleaseIterator(di);
} }
/* If we can't reach at least half the masters, change the cluster state
* as FAIL, as we are not even able to mark nodes as FAIL in this side
* of the netsplit because of lack of majority. */
{
int needed_quorum = (server.cluster->size / 2) + 1;
if (unreachable_masters >= needed_quorum)
server.cluster->state = REDIS_CLUSTER_FAIL;
}
/* Log a state change */ /* Log a state change */
if (initial_state != server.cluster->state) if (initial_state != server.cluster->state)
redisLog(REDIS_WARNING,"Cluster state changed: %s", redisLog(REDIS_WARNING,"Cluster state changed: %s",