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Cluster: configEpoch added in cluster nodes description.

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This commit is contained in:
antirez 2013-09-25 11:47:13 +02:00
parent da257afe57
commit 12483b0061
2 changed files with 31 additions and 2 deletions
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28
src/cluster.c
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@ -59,6 +59,23 @@ int bitmapTestBit(unsigned char *bitmap, int pos);
* Initialization
* -------------------------------------------------------------------------- */
/* This function is called at startup in order to set the currentEpoch
* (which is not saved on permanent storage) to the greatest configEpoch found
* in the loaded nodes (configEpoch is stored on permanent storage as soon as
* it changes for some node). */
void clusterSetStartupEpoch() {
dictIterator *di;
dictEntry *de;
di = dictGetSafeIterator(server.cluster->nodes);
while((de = dictNext(di)) != NULL) {
clusterNode *node = dictGetVal(de);
if (node->configEpoch > server.cluster->currentEpoch)
server.cluster->currentEpoch = node->configEpoch;
}
dictReleaseIterator(di);
}
int clusterLoadConfig(char *filename) {
FILE *fp = fopen(filename,"r");
char *line;
@ -143,8 +160,11 @@ int clusterLoadConfig(char *filename) {
if (atoi(argv[4])) n->ping_sent = time(NULL);
if (atoi(argv[5])) n->pong_received = time(NULL);
/* Set configEpoch for this node. */
n->configEpoch = strtoull(argv[6],NULL,10);
/* Populate hash slots served by this instance. */
for (j = 7; j < argc; j++) {
for (j = 8; j < argc; j++) {
int start, stop;
if (argv[j][0] == '[') {
@ -189,6 +209,7 @@ int clusterLoadConfig(char *filename) {
redisAssert(server.cluster->myself != NULL);
redisLog(REDIS_NOTICE,"Node configuration loaded, I'm %.40s",
server.cluster->myself->name);
clusterSetStartupEpoch();
clusterUpdateState();
return REDIS_OK;
@ -230,6 +251,7 @@ void clusterInit(void) {
server.cluster = zmalloc(sizeof(clusterState));
server.cluster->myself = NULL;
server.cluster->currentEpoch = 0;
server.cluster->state = REDIS_CLUSTER_FAIL;
server.cluster->size = 1;
server.cluster->nodes = dictCreate(&clusterNodesDictType,NULL);
@ -360,6 +382,7 @@ clusterNode *createClusterNode(char *nodename, int flags) {
else
getRandomHexChars(node->name, REDIS_CLUSTER_NAMELEN);
node->ctime = time(NULL);
node->configEpoch = 0;
node->flags = flags;
memset(node->slots,0,sizeof(node->slots));
node->numslots = 0;
@ -2071,9 +2094,10 @@ sds clusterGenNodesDescription(int filter) {
ci = sdscatprintf(ci,"- ");
/* Latency from the POV of this node, link status */
ci = sdscatprintf(ci,"%ld %ld %s",
ci = sdscatprintf(ci,"%ld %ld %llu %s",
(long) node->ping_sent,
(long) node->pong_received,
(unsigned long long) node->configEpoch,
(node->link || node->flags & REDIS_NODE_MYSELF) ?
"connected" : "disconnected");

5
src/redis.h
View File

@ -617,6 +617,7 @@ struct clusterNode {
time_t ctime; /* Node object creation time. */
char name[REDIS_CLUSTER_NAMELEN]; /* Node name, hex string, sha1-size */
int flags; /* REDIS_NODE_... */
uint64_t configEpoch; /* Last configEpoch observed for this node */
unsigned char slots[REDIS_CLUSTER_SLOTS/8]; /* slots handled by this node */
int numslots; /* Number of slots handled by this node */
int numslaves; /* Number of slave nodes, if this is a master */
@ -634,6 +635,7 @@ typedef struct clusterNode clusterNode;
typedef struct {
clusterNode *myself; /* This node */
uint64_t currentEpoch;
int state; /* REDIS_CLUSTER_OK, REDIS_CLUSTER_FAIL, ... */
int size; /* Num of master nodes with at least one slot */
dict *nodes; /* Hash table of name -> clusterNode structures */
@ -707,6 +709,9 @@ typedef struct {
uint64_t time; /* Time at which this request was sent (in milliseconds),
this field is copied in reply messages so that the
original sender knows how old the reply is. */
uint64_t currentEpoch; /* The epoch accordingly to the sending node. */
uint64_t configEpoch; /* The config epoch if it's a master, or the last epoch
advertised by its master if it is a slave. */
char sender[REDIS_CLUSTER_NAMELEN]; /* Name of the sender node */
unsigned char myslots[REDIS_CLUSTER_SLOTS/8];
char slaveof[REDIS_CLUSTER_NAMELEN];