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Sentinel: can-failover option removed, many comments fixed.

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This commit is contained in:
antirez 2013-11-19 09:28:47 +01:00
parent 232cdb95ab
commit 47df12d5d9
1 changed files with 29 additions and 76 deletions
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105
src/sentinel.c
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@ -58,25 +58,20 @@ typedef struct sentinelAddr {
#define SRI_O_DOWN (1<<5) /* Objectively down (quorum reached). */
#define SRI_MASTER_DOWN (1<<6) /* A Sentinel with this flag set thinks that
its master is down. */
/* SRI_CAN_FAILOVER when set in an SRI_MASTER instance means that we are
* allowed to perform the failover for this master.
* When set in a SRI_SENTINEL instance means that sentinel is allowed to
* perform the failover on its master. */
#define SRI_CAN_FAILOVER (1<<7)
#define SRI_FAILOVER_IN_PROGRESS (1<<8) /* Failover is in progress for
#define SRI_FAILOVER_IN_PROGRESS (1<<7) /* Failover is in progress for
this master. */
#define SRI_PROMOTED (1<<9) /* Slave selected for promotion. */
#define SRI_RECONF_SENT (1<<10) /* SLAVEOF <newmaster> sent. */
#define SRI_RECONF_INPROG (1<<11) /* Slave synchronization in progress. */
#define SRI_RECONF_DONE (1<<12) /* Slave synchronized with new master. */
#define SRI_FORCE_FAILOVER (1<<13) /* Force failover with master up. */
#define SRI_SCRIPT_KILL_SENT (1<<14) /* SCRIPT KILL already sent on -BUSY */
#define SRI_PROMOTED (1<<8) /* Slave selected for promotion. */
#define SRI_RECONF_SENT (1<<9) /* SLAVEOF <newmaster> sent. */
#define SRI_RECONF_INPROG (1<<10) /* Slave synchronization in progress. */
#define SRI_RECONF_DONE (1<<11) /* Slave synchronized with new master. */
#define SRI_FORCE_FAILOVER (1<<12) /* Force failover with master up. */
#define SRI_SCRIPT_KILL_SENT (1<<13) /* SCRIPT KILL already sent on -BUSY */
#define SENTINEL_INFO_PERIOD 10000
#define SENTINEL_PING_PERIOD 1000
#define SENTINEL_ASK_PERIOD 1000
#define SENTINEL_PUBLISH_PERIOD 2000
#define SENTINEL_DOWN_AFTER_PERIOD 30000
#define SENTINEL_DEFAULT_DOWN_AFTER 30000
#define SENTINEL_HELLO_CHANNEL "__sentinel__:hello"
#define SENTINEL_TILT_TRIGGER 2000
#define SENTINEL_TILT_PERIOD (SENTINEL_PING_PERIOD*30)
@ -893,7 +888,7 @@ sentinelRedisInstance *createSentinelRedisInstance(char *name, int flags, char *
ri->s_down_since_time = 0;
ri->o_down_since_time = 0;
ri->down_after_period = master ? master->down_after_period :
SENTINEL_DOWN_AFTER_PERIOD;
SENTINEL_DEFAULT_DOWN_AFTER;
ri->master_link_down_time = 0;
ri->auth_pass = NULL;
ri->slave_priority = SENTINEL_DEFAULT_SLAVE_PRIORITY;
@ -1111,7 +1106,7 @@ void sentinelResetMaster(sentinelRedisInstance *ri, int flags) {
}
if (ri->cc) sentinelKillLink(ri,ri->cc);
if (ri->pc) sentinelKillLink(ri,ri->pc);
ri->flags &= SRI_MASTER|SRI_CAN_FAILOVER|SRI_DISCONNECTED;
ri->flags &= SRI_MASTER|SRI_DISCONNECTED;
if (ri->leader) {
sdsfree(ri->leader);
ri->leader = NULL;
@ -1276,17 +1271,6 @@ char *sentinelHandleConfiguration(char **argv, int argc) {
ri->failover_timeout = atoi(argv[2]);
if (ri->failover_timeout <= 0)
return "negative or zero time parameter.";
} else if (!strcasecmp(argv[0],"can-failover") && argc == 3) {
/* can-failover <name> <yes/no> */
int yesno = yesnotoi(argv[2]);
ri = sentinelGetMasterByName(argv[1]);
if (!ri) return "No such master with specified name.";
if (yesno == -1) return "Argument must be either yes or no.";
if (yesno)
ri->flags |= SRI_CAN_FAILOVER;
else
ri->flags &= ~SRI_CAN_FAILOVER;
} else if (!strcasecmp(argv[0],"parallel-syncs") && argc == 3) {
/* parallel-syncs <name> <milliseconds> */
ri = sentinelGetMasterByName(argv[1]);
@ -1826,25 +1810,24 @@ void sentinelReceiveHelloMessages(redisAsyncContext *c, void *reply, void *privd
if (strstr(r->element[2]->str,server.runid) != NULL) return;
{
/* Format is composed of 9 tokens:
* 0=ip,1=port,2=runid,3=can_failover,4=current_epoch,
* 5=master_name,6=master_ip,7=master_port,8=master_config_epoch. */
int numtokens, port, removed, canfailover, master_port;
/* Format is composed of 8 tokens:
* 0=ip,1=port,2=runid,3=current_epoch,4=master_name,
* 5=master_ip,6=master_port,7=master_config_epoch. */
int numtokens, port, removed, master_port;
uint64_t current_epoch, master_config_epoch;
char **token = sdssplitlen(r->element[2]->str,
r->element[2]->len,
",",1,&numtokens);
sentinelRedisInstance *si;
if (numtokens == 9) {
if (numtokens == 8) {
/* First, try to see if we already have this sentinel. */
port = atoi(token[1]);
master_port = atoi(token[7]);
canfailover = atoi(token[3]);
master_port = atoi(token[6]);
si = getSentinelRedisInstanceByAddrAndRunID(
master->sentinels,token[0],port,token[2]);
current_epoch = strtoull(token[4],NULL,10);
master_config_epoch = strtoull(token[8],NULL,10);
current_epoch = strtoull(token[3],NULL,10);
master_config_epoch = strtoull(token[7],NULL,10);
sentinelRedisInstance *msgmaster;
if (!si) {
@ -1871,7 +1854,7 @@ void sentinelReceiveHelloMessages(redisAsyncContext *c, void *reply, void *privd
}
}
/* Update local current_epoch if received current_epoch is greater. */
/* Update local current_epoch if received current_epoch is greater.*/
if (current_epoch > sentinel.current_epoch) {
sentinel.current_epoch = current_epoch;
sentinelEvent(REDIS_WARNING,"+new-epoch",ri,"%llu",
@ -1879,31 +1862,25 @@ void sentinelReceiveHelloMessages(redisAsyncContext *c, void *reply, void *privd
}
/* Update master info if received configuration is newer. */
if ((msgmaster = sentinelGetMasterByName(token[5])) != NULL) {
if ((msgmaster = sentinelGetMasterByName(token[4])) != NULL) {
if (msgmaster->config_epoch < master_config_epoch) {
msgmaster->config_epoch = master_config_epoch;
if (master_port != msgmaster->addr->port ||
!strcmp(msgmaster->addr->ip, token[6]))
!strcmp(msgmaster->addr->ip, token[5]))
{
sentinelEvent(REDIS_WARNING,"+switch-master",
msgmaster,"%s %s %d %s %d",
msgmaster->name,
msgmaster->addr->ip, msgmaster->addr->port,
token[6], master_port);
token[5], master_port);
sentinelResetMasterAndChangeAddress(msgmaster,
token[6], master_port);
token[5], master_port);
}
}
}
/* Update the state of the Sentinel. */
if (si) {
si->last_hello_time = mstime();
if (canfailover)
si->flags |= SRI_CAN_FAILOVER;
else
si->flags &= ~SRI_CAN_FAILOVER;
}
if (si) si->last_hello_time = mstime();
}
sdsfreesplitres(token,numtokens);
}
@ -1964,10 +1941,9 @@ void sentinelPingInstance(sentinelRedisInstance *ri) {
sentinelAddr *master_addr = sentinelGetCurrentMasterAddress(master);
snprintf(payload,sizeof(payload),
"%s,%d,%s,%d,%llu," /* Info about this sentinel. */
"%s,%d,%s,%llu," /* Info about this sentinel. */
"%s,%s,%d,%lld", /* Info about current master. */
ip, server.port, server.runid,
(master->flags & SRI_CAN_FAILOVER) != 0,
(unsigned long long) sentinel.current_epoch,
/* --- */
master->name,master_addr->ip,master_addr->port,
@ -2138,10 +2114,6 @@ void addReplySentinelRedisInstance(redisClient *c, sentinelRedisInstance *ri) {
addReplyBulkLongLong(c,mstime() - ri->last_hello_time);
fields++;
addReplyBulkCString(c,"can-failover-its-master");
addReplyBulkLongLong(c,(ri->flags & SRI_CAN_FAILOVER) != 0);
fields++;
addReplyBulkCString(c,"voted-leader");
addReplyBulkCString(c,ri->leader ? ri->leader : "?");
fields++;
@ -2540,25 +2512,6 @@ void sentinelAskMasterStateToOtherSentinels(sentinelRedisInstance *master, int f
/* =============================== FAILOVER ================================= */
/* Given a master get the "subjective leader", that is, among all the sentinels
* with given characteristics, the one with the lexicographically smaller
* runid. The characteristics required are:
*
* 1) Has SRI_CAN_FAILOVER flag.
* 2) Is not disconnected.
* 3) Recently answered to our ping (no longer than
* SENTINEL_INFO_VALIDITY_TIME milliseconds ago).
*
* The function returns a pointer to an sds string representing the runid of the
* leader sentinel instance (from our point of view). Otherwise NULL is
* returned if there are no suitable sentinels.
*/
int compareRunID(const void *a, const void *b) {
char **aptrptr = (char**)a, **bptrptr = (char**)b;
return strcasecmp(*aptrptr, *bptrptr);
}
/* Vote for the sentinel with 'req_runid' or return the old vote if already
* voted for the specifed 'req_epoch' or one greater.
*
@ -2725,8 +2678,9 @@ void sentinelStartFailover(sentinelRedisInstance *master) {
/* This function checks if there are the conditions to start the failover,
* that is:
*
* 1) Enough time has passed since O_DOWN.
* 2) The master is marked as SRI_CAN_FAILOVER, so we can failover it.
* 1) Master must be in ODOWN condition.
* 2) No failover already in progress.
* 3) No failover already attempted recently.
*
* We still don't know if we'll win the election so it is possible that we
* start the failover but that we'll not be able to act.
@ -2734,8 +2688,7 @@ void sentinelStartFailover(sentinelRedisInstance *master) {
* Return non-zero if a failover was started. */
int sentinelStartFailoverIfNeeded(sentinelRedisInstance *master) {
/* We can't failover if the master is not in O_DOWN state. */
if (!(master->flags & SRI_CAN_FAILOVER) ||
!(master->flags & SRI_O_DOWN)) return 0;
if (!(master->flags & SRI_O_DOWN)) return 0;
/* Failover already in progress? */
if (master->flags & SRI_FAILOVER_IN_PROGRESS) return 0;