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Sentinel: different comments updated to new implementation.
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@ -993,8 +993,8 @@ const char *sentinelRedisInstanceTypeStr(sentinelRedisInstance *ri) {
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else return "unknown";
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}
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/* This function removes all the instances found in the dictionary of instances
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* 'd', having either:
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/* This function removes all the instances found in the dictionary of
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* sentinels in the specified 'master', having either:
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*
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* 1) The same ip/port as specified.
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* 2) The same runid.
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@ -1005,13 +1005,9 @@ const char *sentinelRedisInstanceTypeStr(sentinelRedisInstance *ri) {
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*
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* This function is useful because every time we add a new Sentinel into
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* a master's Sentinels dictionary, we want to be very sure about not
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* having duplicated instances for any reason. This is so important because
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* we use those other sentinels in order to run our quorum protocol to
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* understand if it's time to proceed with the fail over.
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*
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* Making sure no duplication is possible we greatly improve the robustness
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* of the quorum (otherwise we may end counting the same instance multiple
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* times for some reason).
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* having duplicated instances for any reason. This is important because
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* other sentinels are needed to reach ODOWN quorum, and later to get
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* voted for a given configuration epoch in order to perform the failover.
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*
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* The function returns the number of Sentinels removed. */
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int removeMatchingSentinelsFromMaster(sentinelRedisInstance *master, char *ip, int port, char *runid) {
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@ -1623,7 +1619,7 @@ void sentinelReconnectInstance(sentinelRedisInstance *ri) {
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* 1) It is actually a master in the current configuration.
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* 2) It reports itself as a master.
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* 3) It is not SDOWN or ODOWN.
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* 4) We obtained last INFO no more than two times the INFO period of time ago. */
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* 4) We obtained last INFO no more than two times the INFO period time ago. */
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int sentinelMasterLooksSane(sentinelRedisInstance *master) {
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return
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master->flags & SRI_MASTER &&
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@ -2560,8 +2556,8 @@ void sentinelCheckSubjectivelyDown(sentinelRedisInstance *ri) {
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sentinelKillLink(ri,ri->pc);
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}
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/* Update the subjectively down flag. We believe the instance is in SDOWN
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* state if:
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/* Update the SDOWN flag. We believe the instance is SDOWN if:
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*
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* 1) It is not replying.
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* 2) We believe it is a master, it reports to be a slave for enough time
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* to meet the down_after_period, plus enough time to get two times
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@ -2587,7 +2583,12 @@ void sentinelCheckSubjectivelyDown(sentinelRedisInstance *ri) {
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}
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}
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/* Is this instance down accordingly to the configured quorum? */
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/* Is this instance down according to the configured quorum?
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*
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* Note that ODOWN is a weak quorum, it only means that enough Sentinels
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* reported in a given time range that the instance was not reachable.
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* However messages can be delayed so there are no strong guarantees about
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* N instances agreeing at the same time about the down state. */
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void sentinelCheckObjectivelyDown(sentinelRedisInstance *master) {
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dictIterator *di;
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dictEntry *de;
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@ -2657,10 +2658,10 @@ void sentinelReceiveIsMasterDownReply(redisAsyncContext *c, void *reply, void *p
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}
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}
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/* If we think (subjectively) the master is down, we start sending
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/* If we think the master is down, we start sending
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* SENTINEL IS-MASTER-DOWN-BY-ADDR requests to other sentinels
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* in order to get the replies that allow to reach the quorum and
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* possibly also mark the master as objectively down. */
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* in order to get the replies that allow to reach the quorum
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* needed to mark the master in ODOWN state and trigger a failover. */
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#define SENTINEL_ASK_FORCED (1<<0)
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void sentinelAskMasterStateToOtherSentinels(sentinelRedisInstance *master, int flags) {
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dictIterator *di;
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@ -3222,11 +3223,7 @@ void sentinelFailoverReconfNextSlave(sentinelRedisInstance *master) {
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/* This function is called when the slave is in
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* SENTINEL_FAILOVER_STATE_UPDATE_CONFIG state. In this state we need
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* to remove it from the master table and add the promoted slave instead.
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*
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* If there are no promoted slaves as this instance is unique, we remove
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* and re-add it with the same address to trigger a complete state
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* refresh. */
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* to remove it from the master table and add the promoted slave instead. */
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void sentinelFailoverSwitchToPromotedSlave(sentinelRedisInstance *master) {
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sentinelRedisInstance *ref = master->promoted_slave ?
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master->promoted_slave : master;
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