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Redis ¼¯ÈºµÄ TCP ¶Ë¿Ú(Redis Cluster TCP ports)

ÿ¸ö Redis ¼¯Èº½ÚµãÐèÒªÁ½¸ö TCP Á¬½Ó´ò¿ª¡£Õý³£µÄ TCP ¶Ë¿ÚÓÃÀ´·þÎñ¿Í»§¶Ë£¬ÀýÈç 6379£¬¼Ó 10000 µÄ¶Ë¿ÚÓÃ×÷Êý¾Ý¶Ë¿Ú£¬ÔÚÉÏÃæµÄÀý×ÓÖоÍÊÇ 16379¡£ µÚ¶þ¸ö´óһЩµÄ¶Ë¿ÚÓÃÓÚ¼¯Èº×ÜÏß(bus)£¬Ò²¾ÍÊÇʹÓöþ½øÖÆÐ­ÒéµÄµãµ½µãͨÐÅͨµÀ¡£¼¯Èº×ÜÏß±»½ÚµãÓà ÓÚ´íÎó¼ì²â£¬ÅäÖøüУ¬¹ÊÕÏ×ªÒÆÊÚȨµÈµÈ¡£¿Í»§¶Ë²»Ó¦¸Ã³¢ÊÔÁ¬½Ó¼¯Èº×ÜÏ߶˿ڣ¬¶øÓ¦Ò»Ö±ÓëÕý³£µÄ Redis ÃüÁî¶Ë¿ÚͨÐÅ£¬µ«ÊÇҪȷ±£ÔÚ·À»ðǽÖдò¿ªÁËÕâÁ½¸ö¶Ë¿Ú£¬·ñÔò Redis ¼¯ÈºµÄ½Úµã²»ÄÜÏ໥ͨÐÅ¡£ ÃüÁî¶Ë¿ÚºÍ¼¯Èº×ÜÏß¶Ë¿ÚµÄÆ«ÒÆÁ¿Ò»Ö±¹Ì¶¨Îª 10000¡£ ×¢Ò⣬ΪÁËÈà Redis ¼¯Èº¹¤×÷Õý³££¬¶Ôÿ¸ö½Úµã£º 1. ÓÃÓÚÓë¿Í»§¶ËͨÐŵÄÕý³£µÄ¿Í»§¶ËͨÐŶ˿Ú(ͨ³£Îª 6379)ÐèÒª¿ª·Å¸øËùÓÐÐèÒªÁ¬½Ó¼¯ÈºµÄ¿Í»§¶Ë ÒÔ¼°ÆäËû¼¯Èº½Úµã(ʹÓÿͻ§¶Ë¶Ë¿ÚÀ´½øÐмüÇ¨ÒÆ)¡£ 2. ¼¯Èº×ÜÏß¶Ë¿Ú(¿Í»§¶Ë¶Ë¿Ú¼Ó 10000)±ØÐë´ÓËùÓÐµÄÆäËû¼¯Èº½Úµã¿É´ï¡£ Èç¹ûÄã²»´ò¿ªÕâÁ½¸ö TCP ¶Ë¿Ú£¬¼¯Èº¾ÍÎÞ·¨Õý³£¹¤×÷¡£

Redis ¼¯ÈºµÄÊý¾Ý·ÖƬ(Redis Cluster data sharding)

Redis ¼¯ÈºÃ»ÓÐʹÓÃÒ»ÖÂÐÔ¹þÏ££¬¶øÊÇÁíÍâÒ»ÖÖ²»Í¬µÄ·ÖƬÐÎʽ£¬Ã¿¸ö¼ü¸ÅÄîÉÏÊDZ»ÎÒÃdzÆÎª¹þÏ£²Û (hash slot)µÄ¶«Î÷µÄÒ»²¿·Ö¡£ Redis ¼¯ÈºÓÐ 16384 ¸ö¹þÏ£²Û£¬ÎÒÃÇÖ»ÊÇʹÓüüµÄ CRC16 ±àÂë¶Ô 16384 ȡģÀ´¼ÆËãÒ»¸öÖ¸¶¨¼üËùÊôµÄ ¹þÏ£²Û¡£ ÿһ¸ö Redis ¼¯ÈºÖеĽڵ㶼³Ðµ£Ò»¸ö¹þÏ£²ÛµÄ×Ó¼¯£¬ÀýÈ磬Äã¿ÉÄÜÓÐÒ»¸ö 3 ¸ö½ÚµãµÄ¼¯Èº£¬ÆäÖУº

½Úµã A °üº¬´Ó 0 µ½ 5500 µÄ¹þÏ£²Û¡£

½Úµã B °üº¬´Ó 5501 µ½ 11000 µÄ¹þÏ£²Û¡£

½Úµã C °üº¬´Ó 11001 µ½ 16384 µÄ¹þÏ£²Û¡£

Õâ¿ÉÒÔÈÃÔÚ¼¯ÈºÖÐÌí¼ÓºÍÒÆ³ý½Úµã·Ç³£ÈÝÒס£ÀýÈ磬Èç¹ûÎÒÏëÌí¼ÓÒ»¸öнڵã D£¬ÎÒÐèÒª´Ó½Úµã A£¬B£¬ C ÒÆ¶¯Ò»Ð©¹þÏ£²Ûµ½½Úµã D¡£Í¬ÑùµØ£¬Èç¹ûÎÒÏë´Ó¼¯ÈºÖÐÒÆ³ý½Úµã A£¬ÎÒÖ»ÐèÒªÒÆ¶¯ A µÄ¹þÏ£²Ûµ½ B ºÍ C¡£ µ±½Úµã A ±ä³É¿ÕµÄÒÔºó£¬ÎҾͿÉÒÔ´Ó¼¯ÈºÖг¹µ×ɾ³ýËü¡£ ÒòΪ´ÓÒ»¸ö½ÚµãÏòÁíÒ»¸ö½ÚµãÒÆ¶¯¹þÏ£²Û²¢²»ÐèҪֹͣ²Ù×÷£¬ËùÒÔÌí¼ÓºÍÒÆ³ý½Úµã£¬»òÕ߸ıä½Úµã³ÖÓÐ µÄ¹þÏ£²Û°Ù·Ö±È£¬¶¼²»ÐèÒªÈκÎÍ£»úʱ¼ä(downtime)¡£

Redis cluster ¼Ü¹¹(Redis Cluster Architecture)

redis-cluster ¼Ü¹¹Í¼

¼Ü¹¹Ï¸½Ú:

ËùÓÐµÄ redis ½Úµã±Ë´Ë»¥Áª(PING-PONG »úÖÆ),ÄÚ²¿Ê¹Óöþ½øÖÆÐ­ÒéÓÅ»¯´«ÊäËٶȺʹø¿í.

½ÚµãµÄ fail ÊÇͨ¹ý¼¯ÈºÖг¬¹ý°ëÊýµÄ½Úµã¼ì²âʧЧʱ²ÅÉúЧ.

¿Í»§¶ËÓë redis ½ÚµãÖ±Á¬,²»ÐèÒªÖмä proxy ²ã.¿Í»§¶Ë²»ÐèÒªÁ¬½Ó¼¯ÈºËùÓнڵã,Á¬½Ó¼¯ÈºÖÐÈκÎÒ»¸ö ¿ÉÓýڵ㼴¿É

redis-cluster °ÑËùÓеÄÎïÀí½ÚµãÓ³Éäµ½[0-16383]slot ÉÏ,cluster ¸ºÔðά»¤ node<->slot<->value

redis-cluster Ñ¡¾Ù:ÈÝ´í

ÁìÐäÑ¡¾Ù¹ý³ÌÊǼ¯ÈºÖÐËùÓÐ master ²ÎÓë,Èç¹û°ëÊýÒÔÉÏ master ½ÚµãÓë master ½ÚµãͨÐų¬¹ý (cluster-node-timeout),ÈÏΪµ±Ç° master ½Úµã¹Òµô.

ʲôʱºòÕû¸ö¼¯Èº²»¿ÉÓÃ(cluster_state:fail)

a:Èç¹û¼¯ÈºÈÎÒâ master ¹Òµô,ÇÒµ±Ç° master ûÓÐ slave.¼¯Èº½øÈë fail ״̬,Ò²¿ÉÒÔÀí½â³É¼¯ÈºµÄ slot Ó³ Éä[0-16383]²»Íê³Éʱ½øÈë fail ״̬. ps : redis-3.0.0.rc1 ¼ÓÈë cluster-require-full-coverage ²ÎÊý,ĬÈϹرÕ, ´ò¿ª¼¯Èº¼æÈݲ¿·Öʧ°Ü.

b:Èç¹û¼¯Èº³¬¹ý°ëÊýÒÔÉÏ master ¹Òµô£¬ÎÞÂÛÊÇ·ñÓÐ slave ¼¯Èº½øÈë fail ״̬.

ps:µ±¼¯Èº²»¿ÉÓÃʱ,ËùÓжԼ¯ÈºµÄ²Ù×÷×ö¶¼²»¿ÉÓã¬ÊÕµ½((error) CLUSTERDOWN The cluster is down) ´íÎó

Redis ¼¯ÈºµÄÖ÷´ÓÄ£ÐÍ(Redis Cluster master-slave model)

ΪÁ˵±²¿·Ö½ÚµãʧЧʱ£¬»òÕßÎÞ·¨Óë´ó¶àÊý½ÚµãͨÐÅʱÈÔÄܱ£³Ö¿ÉÓã¬Redis ¼¯Èº²ÉÓÃÿ¸ö½ÚµãÓµÓÐ 1(Ö÷ ·þÎñ×ÔÉí)µ½ N ¸ö¸±±¾(N-1 ¸ö¸½¼ÓµÄ´Ó·þÎñÆ÷)µÄÖ÷´ÓÄ£ÐÍ¡£ ÔÚÎÒÃǵÄÀý×ÓÖУ¬¼¯ÈºÓµÓÐ A£¬B£¬C Èý¸ö½Úµã£¬Èç¹û½Úµã B ʧЧ¼¯Èº½«²»ÄܼÌÐø·þÎñ£¬ÒòΪÎÒÃDz»ÔÙ Óа취À´·þÎñÔÚ 5501-11000 ·¶Î§ÄڵĹþÏ£²Û¡£ µ«ÊÇ£¬Èç¹ûµ±ÎÒÃÇ´´½¨¼¯Èººó(»òÕßÉÔºó)£¬ÎÒÃÇΪÿһ¸öÖ÷·þÎñÆ÷Ìí¼ÓÒ»¸ö´Ó·þÎñÆ÷£¬ÕâÑù×îÖյļ¯Èº ¾ÍÓÉÖ÷·þÎñÆ÷ A£¬B£¬C ºÍ´Ó·þÎñÆ÷ A1£¬B1£¬C1 ×é³É£¬Èç¹û B ½ÚµãʧЧϵͳÈÔÄܼÌÐø·þÎñ¡£ B1 ½Úµã¸´ÖÆ B ½Úµã£¬ÓÚÊǼ¯Èº»áÑ¡¾Ù B1 ½Úµã×÷ΪеÄÖ÷·þÎñÆ÷£¬²¢¼ÌÐøÕýÈ·µÄÔËת¡£

Redis ¼¯ÈºµÄÒ»ÖÂÐÔ±£Ö¤(Redis Cluster consistency guarantees)

Redis ¼¯Èº²»±£Ö¤Ç¿Ò»ÖÂÐÔ¡£Êµ¼ùÖУ¬ÕâÒâζ×ÅÔÚÌØ¶¨µÄÌõ¼þÏ£¬Redis ¼¯Èº¿ÉÄܻᶪµôһЩ±»ÏµÍ³ÊÕ µ½µÄдÈëÇëÇóÃüÁî¡£

Redis ¼¯ÈºÎªÊ²Ã´»á¶ªÊ§Ð´ÇëÇóµÄµÚÒ»¸öÔ­Òò£¬ÊÇÒòΪ²ÉÓÃÁËÒì²½¸´ÖÆ¡£ÕâÒâζ×ÅÔÚдÆÚ¼äÏÂÃæµÄÊÂÇé ·¢ÉúÁË£º

ÄãµÄ¿Í»§¶ËÏòÖ÷·þÎñÆ÷ B дÈë¡£

Ö÷·þÎñÆ÷ B »Ø¸´ OK ¸øÄãµÄ¿Í»§¶Ë¡£

Ö÷·þÎñÆ÷ B ´«²¥Ð´Èë²Ù×÷µ½Æä´Ó·þÎñÆ÷ B1£¬B2 ºÍ B3¡£

ÊÖ¶¯¹ÊÕÏ×ªÒÆ(Manual failover)

ÓÐʱºòÔÚÖ÷·þÎñÆ÷ÊÂʵÉÏûÓÐÈκιÊÕϵÄÇé¿öÏÂÇ¿ÖÆÒ»´Î¹ÊÕÏ×ªÒÆÊǺÜÓÐÓõġ£ÀýÈ磬ΪÁËÉý¼¶Ö÷·þÎñ Æ÷½ÚµãÖеÄÒ»¸ö½ø³Ì£¬¿ÉÒÔ¶ÔÆä½øÐйÊÕÏ×ªÒÆÊ¹Æä±äΪһ¸ö´Ó·þÎñÆ÷£¬ÕâÑù×îС»¯Á˶ԿÉÓÃÐÔµÄÓ°Ïì¡£

Redis ¼¯ÈºÖ§³ÖʹÓà CLUSTER FAILOVER ÃüÁîÀ´ÊÖ¶¯¹ÊÕÏ×ªÒÆ£¬±ØÐëÔÚÄãÏë½øÐйÊÕÏ×ªÒÆµÄÖ÷·þÎñµÄ ÆäÖÐÒ»¸ö´Ó·þÎñÆ÷ÉÏÖ´ÐС£

ÊÖ¶¯¹ÊÕÏ×ªÒÆºÜÌØ±ð£¬ºÍÕæÕýÒòΪÖ÷·þÎñÆ÷ʧЧ¶ø²úÉúµÄ¹ÊÕÏ×ªÒÆÒª¸ü°²È«£¬ÒòΪ²ÉÈ¡Á˱ÜÃâ¹ý³ÌÖÐÊý ¾Ý¶ªÊ§µÄ·½Ê½£¬½öµ±ÏµÍ³È·ÈÏеÄÖ÷·þÎñÆ÷´¦ÀíÍêÁ˾ɵÄÖ÷·þÎñÆ÷µÄ¸´ÖÆÁ÷ʱ£¬¿Í»§¶Ë²Å´ÓÔ­Ö÷·þÎñÆ÷ÇÐ »»µ½ÐÂÖ÷·þÎñÆ÷¡£

´´½¨redis¼¯Èº(create a new cluser)

redis-trib create --replicas 1 127.0.0.1:6379 127.0.0.1:7379 127.0.0.2:6379 127.0.0.2:7379 127.0.0.3:6379 127.0.0.3:7379 127.0.0.4:6379 127.0.0.4:7379 127.0.0.5:6379 127.0.0.5:7379

²é¿´redis¼¯Èº×´Ì¬(check cluser status)

redis-trib check 127.0.0.1:7379

²é¿´node״̬(check node status)

# redis-cli -c -p 6379

# INFO

Ìí¼Óнڵã(Adding a new node)

Ìí¼ÓÒ»¸öнڵãµÄ¹ý³Ì»ù±¾ÉϾÍÊÇ£¬Ìí¼ÓÒ»¸ö¿Õ½Úµã£¬È»ºó£¬Èç¹ûÊÇ×÷ΪÖ÷½ÚµãÔòÒÆ¶¯Ò»Ð©Êý¾Ý½øÈ¥£¬ Èç¹ûÊÇ´Ó½ÚµãÔòÆä×÷Ϊij¸ö½ÚµãµÄ¸±±¾¡£

Á½ÖÖÇé¿öÎÒÃǶ¼»áÌÖÂÛ£¬ÏÈ´ÓÌí¼ÓÒ»¸öеÄÖ÷·þÎñÆ÷ʵÀý¿ªÊ¼¡£

Á½ÖÖÇé¿öÏ£¬µÚÒ»²½ÒªÍê³ÉµÄ¶¼ÊÇÌí¼ÓÒ»¸ö¿Õ½Úµã¡£

ÎÒÃÇʹÓÃÓëÆäËû½ÚµãÏàͬµÄÅäÖÃ(¶Ë¿ÚºÅ³ýÍâ)ÔÚ 7006 ¶Ë¿Ú(ÎÒÃÇÒÑ´æÔÚµÄ 6 ¸ö½ÚµãÒѾ­Ê¹ÓÃÁË´Ó 7000 µ½ 7005 µÄ¶Ë¿Ú)ÉÏ¿ªÆôÒ»¸öеĽڵ㣬ÄÇôΪÁËÓëÎÒÃÇ֮ǰµÄ½Úµã²¼¾ÖÒ»Ö£¬ÄãµÃÕâô×ö£º

ÔÚÄãµÄÖն˳ÌÐòÖпªÆôÒ»¸öеıêÇ©´°¿Ú¡£

½øÈë cluster-test Ŀ¼¡£

´´½¨Ò»¸öÃûΪ 7006 µÄĿ¼¡£

ÔÚÀïÃæ´´½¨Ò»¸ö redis.conf µÄÎļþ£¬ÀàËÆÓÚÆäËü½ÚµãʹÓõÄÎļþ£¬µ«ÊÇʹÓà 7006 ×÷Ϊ¶Ë¿ÚºÅ¡£

×îºóʹÓÃ../redis-server ./redis.conf Æô¶¯·þÎñÆ÷¡£

./redis-trib.rb add-node 127.0.0.1:7006 127.0.0.1:7000

Ìí¼Ó¸±±¾½Úµã(Adding a new node as a replica)

Ìí¼ÓÒ»¸öи±±¾¿ÉÒÔÓÐÁ½ÖÖ·½Ê½¡£ÏÔ¶øÒ×¼ûµÄÒ»ÖÖ·½Ê½ÊÇÔÙ´ÎʹÓà redis-trib£¬µ«ÊÇҪʹÓáªslave Ñ¡Ï ÏñÕâÑù£º

./redis-trib.rb add-node --slave 127.0.0.1:7006 127.0.0.1:7000

×¢Ò⣬ÕâÀïµÄÃüÁîÐÐÍêÈ«ÏñÎÒÃÇÔÚÌí¼ÓÒ»¸öÐÂÖ÷·þÎñÆ÷ʱʹÓõÄÒ»Ñù£¬ËùÒÔÎÒÃÇûÓÐÖ¸¶¨Òª¸øÄĸöÖ÷·þ ÎñÆ÷Ìí¼Ó¸±±¾¡£ÕâÖÖÇé¿öÏ£¬redis-trib »áÌí¼ÓÒ»¸öнڵã×÷Ϊһ¸ö¾ßÓнÏÉÙ¸±±¾µÄËæ»úµÄÖ÷·þÎñÆ÷µÄ¸±±¾¡£

µ«ÊÇ£¬Äã¿ÉÒÔʹÓÃÏÂÃæµÄÃüÁîÐо«È·µØÖ¸¶¨ÄãÏëÒªµÄÖ÷·þÎñÆ÷×÷Ϊ¸±±¾µÄÄ¿±ê£º

./redis-trib.rb add-node --slave --master-id 3c3a0c74aae0b56170ccb03a76b60cfe7dc1912e 127.
0.0.1:7006 127.0.0.1:7000

ÒÆ³ý½Úµã(Removing a node)

ÒªÒÆ³ýÒ»¸ö´Ó·þÎñÆ÷½Úµã£¬Ö»ÒªÊ¹Óà redis-trib µÄ del-node ÃüÁî¾Í¿ÉÒÔ£º

./redis-trib del-node 127.0.0.1:7000 <node-id>

Éý¼¶½Úµã(Upgrading nodes in a Redis Cluster)

Éý¼¶´Ó·þÎñÆ÷½ÚµãºÜ¼òµ¥£¬ÒòΪÄãÖ»ÐèҪֹͣ½ÚµãÈ»ºóÓÃÒѸüÐ嵀 Redis °æ±¾ÖØÆô¡£Èç¹ûÓпͻ§¶ËʹÓà ´Ó·þÎñÆ÷½Úµã·ÖÀë¶ÁÇëÇó£¬ËüÃÇÓ¦¸ÃÄܹ»ÔÚij¸ö½Úµã²»¿ÉÓÃÊ±ÖØÐÂÁ¬½ÓÁíÒ»¸ö´Ó·þÎñÆ÷¡£

Éý¼¶Ö÷·þÎñÆ÷ÒªÉÔ΢¸´ÔÓһЩ£¬½¨ÒéµÄ²½ÖèÊÇ£º

1. ʹÓà CLUSTER FAILOVER À´´¥·¢Ò»´ÎÊÖ¹¤¹ÊÕÏ×ªÒÆÖ÷·þÎñÆ÷(Çë¿´±¾ÎĵµµÄÊÖ¹¤¹ÊÕÏ×ªÒÆÐ¡ ½Ú)¡£

2. µÈ´ýÖ÷·þÎñÆ÷±äΪ´Ó·þÎñÆ÷¡£

3. ÏñÉý¼¶´Ó·þÎñÆ÷ÄÇÑùÉý¼¶Õâ¸ö½Úµã¡£

4. Èç¹ûÄãÏëÈÃÄã¸Õ¸ÕÉý¼¶µÄ½Úµã³ÉΪÖ÷·þÎñÆ÷£¬´¥·¢Ò»´ÎеÄÊÖ¹¤¹ÊÕÏ×ªÒÆ£¬ÈÃÉý¼¶µÄ½ÚµãÖØÐÂ±ä »ØÖ÷·þÎñÆ÷¡£

   
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