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Cluster: manual failover initial implementation.

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This commit is contained in:
antirez
2014-02-05 13:01:24 +01:00
parent 4919a13f50
commit 4cf0cd5719
2 changed files with 180 additions and 5 deletions
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20
src/cluster.h
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@ -22,6 +22,8 @@
#define REDIS_CLUSTER_FAILOVER_AUTH_RETRY_MULT 4 /* Auth request retry time. */
#define REDIS_CLUSTER_FAILOVER_DELAY 5 /* Seconds */
#define REDIS_CLUSTER_DEFAULT_MIGRATION_BARRIER 1
#define REDIS_CLUSTER_MF_TIMEOUT 5000 /* Milliseconds to do a manual failover. */
#define REDIS_CLUSTER_MF_PAUSE_MULT 2 /* Master pause manual failover mult. */
struct clusterNode;
@ -100,6 +102,16 @@ typedef struct clusterState {
int failover_auth_sent; /* True if we already asked for votes. */
int failover_auth_rank; /* This slave rank for current auth request. */
uint64_t failover_auth_epoch; /* Epoch of the current election. */
/* Manual failover state in common. */
mstime_t mf_end; /* Manual failover time limit (ms unixtime).
It is zero if there is no MF in progress. */
/* Manual failover state of master. */
clusterNode *mf_slave; /* Slave performing the manual failover. */
/* Manual failover state of slave. */
long long mf_master_offset; /* Master offset the slave needs to start MF
or zero if stil not received. */
int mf_can_start; /* If non-zero signal that the manual failover
can start requesting masters vote. */
/* The followign fields are uesd by masters to take state on elections. */
uint64_t last_vote_epoch; /* Epoch of the last vote granted. */
int todo_before_sleep; /* Things to do in clusterBeforeSleep(). */
@ -127,6 +139,7 @@ typedef struct clusterState {
#define CLUSTERMSG_TYPE_FAILOVER_AUTH_REQUEST 5 /* May I failover? */
#define CLUSTERMSG_TYPE_FAILOVER_AUTH_ACK 6 /* Yes, you have my vote */
#define CLUSTERMSG_TYPE_UPDATE 7 /* Another node slots configuration */
#define CLUSTERMSG_TYPE_MFSTART 8 /* Pause clients for manual 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
@ -180,6 +193,7 @@ union clusterMsgData {
} update;
};
typedef struct {
uint32_t totlen; /* Total length of this message */
uint16_t type; /* Message type */
@ -197,12 +211,16 @@ typedef struct {
uint16_t port; /* Sender TCP base port */
uint16_t flags; /* Sender node flags */
unsigned char state; /* Cluster state from the POV of the sender */
unsigned char notused2[3]; /* Reserved for future use. For alignment. */
unsigned char mflags[3]; /* Message flags: CLUSTERMSG_FLAG[012]_... */
union clusterMsgData data;
} clusterMsg;
#define CLUSTERMSG_MIN_LEN (sizeof(clusterMsg)-sizeof(union clusterMsgData))
/* Message flags better specify the packet content or are used to
* provide some information about the node state. */
#define CLUSTERMSG_FLAG0_PAUSED (1<<0) /* Master paused for manual failover. */
/* ---------------------- API exported outside cluster.c -------------------- */
clusterNode *getNodeByQuery(redisClient *c, struct redisCommand *cmd, robj **argv, int argc, int *hashslot, int *ask);