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1 ¼¯Èº¼Ü¹¹

RocketMQ µÄ¼¯Èº¼Ü¹¹ÈçÏÂͼ£º

´ÓÉÏͼ¿ÉÒÔ¿´µ½£¬Õû¸ö¼¯ÈºÖÐÓÐËĸö½ÇÉ«£º Name Server¼¯Èº¡¢BrokerÖ÷´Ó¼¯Èº¡¢Producer¡¢Consumer¡£

1.1 Name Server ¼¯Èº

Name Server ¼¯Èº²¿Ê𣬵«ÊǽڵãÖ®¼ä²¢²»»áͬ²½Êý¾Ý£¬ÒòΪÿ¸ö½Úµã¶¼»á±£´æÍêÕûµÄÊý¾Ý¡£Òò´Ëµ¥¸ö½Úµã¹Òµô£¬²¢²»»á¶Ô¼¯Èº²úÉúÓ°Ïì¡£

1.2 Broker

Broker ²ÉÓÃÖ÷´Ó¼¯Èº£¬ÊµÏֶั±¾´æ´¢ºÍ¸ß¿ÉÓá£Ã¿¸ö Broker ½Úµã¶¼Òª¸úËùÓÐµÄ Name Server ½Úµã½¨Á¢³¤Á¬½Ó£¬¶¨Òå×¢²á Topic ·ÓÉÐÅÏ¢ºÍ·¢ËÍÐÄÌø¡£

¸úËùÓÐ Name Server ½¨Á¢Á¬½Ó£¬¾Í²»»áÒòΪµ¥¸ö Name Server ¹ÒÁËÓ°Ïì Broker ʹÓá£Broker Ö÷´ÓģʽÖУ¬ Slave ½ÚµãÖ÷¶¯´Ó Master ½ÚµãÀ­È¡ÏûÏ¢¡£

1.3 Producer

Producer ¸ú Name Server µÄÈÎÒâÒ»¸ö½Úµã½¨Á¢³¤Á¬½Ó£¬¶¨ÆÚ´Ó Name Server À­È¡ Topic ·ÓÉÐÅÏ¢¡£Producer ÊÇ·ñ²ÉÓü¯Èº£¬È¡¾öÓÚËüËùÔÚµÄÒµÎñϵͳ¡£

1.4 Consumer

Consumer ¸ú Name Server µÄÈÎÒâÒ»¸ö½Úµã½¨Á¢³¤Á¬½Ó£¬¶¨ÆÚ´Ó Name Server À­È¡ Topic ·ÓÉÐÅÏ¢¡£Consumer ÊÇ·ñ²ÉÓü¯Èº£¬È¡¾öÓÚËüËùÔÚµÄÒµÎñϵͳ¡£

Producer ºÍ Consumer Ö»¸úÈÎÒâÒ»¸ö Name Server ½Úµã½¨Á¢Á¬½Ó£¬ÒòΪ Broker »áÏòËùÓÐ Name Server ×¢²á Topic ÐÅÏ¢£¬ËùÒÔÿ¸ö Name Server ±£´æµÄÊý¾ÝÆäʵÊÇÒ»Öµġ£

2 MessageQueue

Producer ·¢Ë͵ÄÏûÏ¢»áÔÚ Broker µÄ MessageQueue Öб£´æ£¬ÈçÏÂͼ£º

ÓÐÁË MessageQueue £¬Topic ¾Í¿ÉÒÔÔÚ Broker ÖÐʵÏÖ·Ö²¼Ê½´æ´¢£¬ÈçÉÏͼ£¬Broker ¼¯ÈºÖб£´æÁË 4 ¸öMessageQueue£¬ÕâЩ MessageQueue ±£´æÁË Topic1-Topic3 ÕâÈý¸ö Topic µÄÏûÏ¢¡£

MessageQueue ÀàËÆÓÚ Kafka ÖÐµÄ Partition£¬ÓÐÁË MessageQueue£¬Producer ¿ÉÒÔ²¢·¢µØÏò Broker Öз¢ËÍÏûÏ¢£¬Consumer Ò²¿ÉÒÔ²¢·¢µØÏû·ÑÏûÏ¢¡£

ĬÈÏ Topic ¿ÉÒÔ´´½¨µÄ MessageQueue ÊýÁ¿ÊÇ 4£¬Broker ¿ÉÒÔ´´½¨µÄ MessageQueue ÊýÁ¿ÊÇ 8, RocketMQ Ñ¡Ôñ¶þÕßÖÐÊýÁ¿Ð¡µÄ£¬Ò²¾ÍÊÇ 4¡£²»¹ýÕâÁ½¸öÖµ¶¼¿ÉÒÔÅäÖá£

3 Consumer

RocketMQµÄÏû·ÑģʽÈçÏÂͼ£º

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RocketMQ ͨ¹ý Consumer Group ʵÏÖÏûÏ¢¹ã²¥¡£±ÈÈçÉÏͼÖÐÓÐÁ½¸öÏû·ÑÕß×飬ÿ¸öÏû·ÑÕß×éÓÐÁ½¸öÏû·ÑÕß¡£

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4 Broker ¸ß¿ÉÓü¯Èº

Broker ¼¯ÈºÈçÏÂͼ£º

Broker ͨ¹ýÖ÷´Ó¼¯ÈºÀ´ÊµÏÖÏûÏ¢¸ß¿ÉÓ᣸ú Kafka ²»Í¬µÄÊÇ£¬RocketMQ ²¢Ã»ÓÐ Master ½ÚµãÑ¡¾Ù¹¦ÄÜ£¬¶øÊDzÉÓöà Master ¶à Slave µÄ¼¯Èº¼Ü¹¹¡£Producer дÈëÏûϢʱдÈë Master ½Úµã£¬Slave ½ÚµãÖ÷¶¯´Ó Master ½ÚµãÀ­È¡Êý¾ÝÀ´±£³Ö¸ú Master ½ÚµãµÄÊý¾ÝÒ»Ö¡£

Consumer Ïû·ÑÏûϢʱ£¬¼È¿ÉÒÔ´Ó Master ½ÚµãÀ­È¡Êý¾Ý£¬Ò²¿ÉÒÔ´Ó Slave ½ÚµãÀ­È¡Êý¾Ý¡£ µ½µ×ÊÇ´Ó Master À­È¡»¹ÊÇ´Ó Slave À­È¡È¡¾öÓÚ Master ½ÚµãµÄ¸ºÔØºÍ Slave µÄͬ²½Çé¿ö ¡£Èç¹û Master ¸ºÔغܸߣ¬Master »á֪ͨ Consumer ´Ó Slave À­È¡ÏûÏ¢£¬¶øÈç¹û Slave ͬ²½ÏûÏ¢½ø¶ÈÑÓºó£¬Ôò Master »á֪ͨ Consumer ´Ó Master À­È¡Êý¾Ý¡£×ÜÖ®£¬´Ó Master À­È¡»¹ÊÇ´Ó Slave À­È¡ÓÉ Master À´¾ö¶¨¡£

Èç¹û Master ½Úµã·¢Éú¹ÊÕÏ£¬RocketMQ »áʹÓûùÓÚ raft ЭÒéµÄ DLedger Ëã·¨À´½øÐÐÖ÷´ÓÇл»¡£

Broker ÿ¸ô 30s Ïò Name Server ·¢ËÍÐÄÌø£¬Name Server Èç¹û 120s ûÓÐÊÕµ½ÐÄÌø£¬¾Í»áÅÐ¶Ï Broker å´»úÁË¡£

5 ÏûÏ¢´æ´¢

RocketMQ µÄ´æ´¢Éè¼ÆÊǷdz£Óд´ÔìÐԵġ£´æ´¢ÎļþÖ÷ÒªÓÐÈý¸ö£ºCommitLog¡¢ConsumeQueue¡¢Index¡£ÈçÏÂͼ£º

5.1 CommitLog

RocketMQ µÄÏûÏ¢±£´æÔÚ CommitLog ÖУ¬CommitLog ÿ¸öÎļþ 1G ´óС¡£ÓÐȤµÄÊÇ£¬ÎļþÃû²¢²»½Ð CommitLog£¬¶øÊÇÓÃÏûÏ¢µÄÆ«ÒÆÁ¿À´ÃüÃû¡£±ÈÈçµÚÒ»¸öÎļþÎļþÃûÊÇ 0000000000000000000£¬µÚ¶þ¸öÎļþÎļþÃûÊÇ 00000000001073741824£¬ÒÀ´ÎÀàÍÆ¾Í¿ÉÒԵõ½ËùÓÐÎļþµÄÎļþÃû¡£

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R oc ketMQ д CommitLog ʱ²ÉÓÃ˳Ðòд£¬´ó´óÌá¸ßÁËдÈëÐÔÄÜ¡£

5.2 ConsumeQueue

Èç¹ûÖ±½Ó´Ó CommitLog ÖмìË÷ Topic ÖеÄÒ»ÌõÏûÏ¢£¬Ð§ÂÊ»áºÜµÍ£¬ÒòΪÐèÒª´ÓÎļþµÄµÚÒ»ÌõÏûÏ¢¿ªÊ¼ÒÀ´Î²éÕÒ¡£ÒýÈëÁË ConsumeQueue ×÷Ϊ CommitLog µÄË÷ÒýÎļþ£¬»áÈüìË÷ЧÂÊ´óÔö¡£

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ConsumeQueue ÖеÄÔªËØÄÚÈÝÈçÏ£º

ǰ 8 ¸ö×ֽڼǼÏûÏ¢ÔÚ CommitLog ÖÐµÄÆ«ÒÆÁ¿¡£

Öмä 4 ¸ö×ֽڼǼÏûÏ¢ÏûÏ¢´óС¡£

×îºó 8 ¸ö×ֽڼǼÏûÏ¢ÖÐ tag µÄ hashcode¡£

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¿ÉÒÔ¿´µ½£¬Õâ¸ö¶©ÔĹØÏµÊÇÒ»¸ö hash ÀàÐ͵Ľṹ£¬key ÊÇ Topic Ãû³Æ£¬value ÊÇÒ»¸ö SubscriptionData ÀàÐ͵ĶÔÏó£¬Õâ¸ö¶ÔÏó·â×°ÁË tag¡£

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5.3 Index Îļþ

RocketMQ Ö§³Ö°´ÕÕÏûÏ¢µÄÊôÐÔ²éÕÒÏûÏ¢£¬ÎªÁËÖ§³ÖÕâ¸ö¹¦ÄÜ£¬RocketMQ ÒýÈëÁË Index Ë÷ÒýÎļþ¡£Index ÎļþÓÐÈý²¿·Ö×é³É£¬ÎļþÍ· IndexHead¡¢500Íò¸ö hash ²ÛºÍ 2000 Íò¸ö Index ÌõÄ¿×é³É¡£

5.3.1 IndexHead

×ܹ²ÓÐ 6 ¸öÔªËØ×é³É£¬Ç°Á½¸öÔªËØ±íʾµ±Ç°Õâ¸ö Index ÎļþÖеÚÒ»ÌõÏûÏ¢ºÍ×îºóÒ»ÌõÏûÏ¢µÄÂäÅÌʱ¼ä£¬µÚÈý¡¢µÚËÄÁ½¸öÔªËØ±íʾµ±Ç°Õâ¸ö Index ÎļþÖеÚÒ»ÌõÏûÏ¢ºÍ×îºóÒ»ÌõÏûÏ¢ÔÚ CommitLog ÎļþÖеÄÎïÀíÆ«ÒÆÁ¿£¬µÚÎå¸öÔªËØ±íʾµ±Ç°Õâ¸ö Index ÎļþÖÐ hash ²ÛµÄÊýÁ¿£¬µÚÁù¸öÔªËØ±íʾµ±Ç°Õâ¸ö Index ÎļþÖÐË÷ÒýÌõÄ¿µÄ¸öÊý¡£

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5.3.2 Hash ²Û

ÊìϤ Java ÖÐ HashMap µÄͬѧӦ¸Ã¶¼±È½ÏÊìϤ Hash ²ÛÕâ¸ö¸ÅÄîÁË£¬Æäʵ¾ÍÊÇ Hash ½á¹¹µÄµ×²ãÊý×é¡£Index ÎļþÖÐµÄ Hash ²ÛÓÐ 500 Íò¸öÊý×éÔªËØ£¬Ã¿¸öÔªËØÊÇ 4 ¸ö×Ö½Ú int ÀàÐÍÔªËØ£¬±£´æµ±Ç°²ÛÏÂ×îеÄÄǸö index ÌõÄ¿µÄÐòºÅ¡£

ÕâÀï Hash ²Û½â¾ö Hash ³åÍ»µÄ·½Ê½ÊÇÁ´±í·¨£¬ÈçÏÂͼ£º

5.3.3 Index ÌõÄ¿

ÿ¸ö Index ÌõÄ¿ÖУ¬key µÄ hashcode Õ¼ 4 ¸ö×Ö½Ú£¬phyoffset ±íʾÏûÏ¢ÔÚ CommitLog ÖеÄÎïÀíÆ«ÒÆÁ¿Õ¼ 8 ¸ö×Ö½Ú£¬timediff ±íʾÏûÏ¢µÄÂäÅÌʱ¼äÓë header ÀïµÄ beginTimestamp µÄ²îÖµÕ¼ 4 ¸ö×Ö½Ú£¬pre index no Õ¼ 4 ¸ö×Ö½Ú¡£

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5.3.4 ±¾½Ú×ܽá

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6 Ë¢Å̲ßÂÔ

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6.1 Ò첽ˢÅÌ

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6.2 ͬ²½Ë¢ÅÌ

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7 ×ܽá

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