zookeeper.jarÊÇÒ»¸ö·Ö²¼Ê½µÄ£¬¿ª·ÅÔ´ÂëµÄ·Ö²¼Ê½Ó¦ÓóÌÐòЭµ÷·þÎñ¡£zookeeper.jarÊÇGoogleµÄChubbyÒ»¸ö¿ªÔ´µÄʵÏÖ£¬Ò²ÊÇHadoopºÍHbaseµÄÖØÒª×é¼þ¡£ËüÊÇÒ»¸öΪ·Ö²¼Ê½Ó¦ÓÃÌṩһÖÂÐÔ·þÎñµÄÈí¼þ£¬ÌṩµÄ¹¦ÄÜ°üÀ¨£ºÅäÖÃά»¤¡¢ÓòÃû·þÎñ¡¢·Ö²¼Ê½Í¬²½¡¢×é·þÎñµÈ¡£

zookeeper.jar¹¤×÷Ô­Àí£º

ZooKeeperÊÇÒÔFast PaxosË㷨Ϊ»ù´¡µÄ£¬Paxos Ëã·¨´æÔÚ»îËøµÄÎÊÌ⣬¼´µ±Óжà¸öproposer½»´íÌύʱ£¬ÓпÉÄÜ»¥ÏàÅų⵼ÖÂûÓÐÒ»¸öproposerÄÜÌá½»³É¹¦£¬¶øFast Paxos×÷ÁËһЩÓÅ»¯£¬Í¨¹ýÑ¡¾Ù²úÉúÒ»¸öleader (Áìµ¼Õß)£¬Ö»ÓÐleader²ÅÄÜÌá½»proposer£¬¾ßÌåËã·¨¿É¼ûFast Paxos¡£Òò´Ë£¬ÒªÏëŪ¶®ZooKeeperÊ×ÏȵöÔFast PaxosÓÐËùÁ˽⡣

zookeeper.jar¹¤×÷Á÷³Ì£º

1¡¢Ñ¡¾ÙLeader¡£

2¡¢Í¬²½Êý¾Ý¡£

3¡¢Ñ¡¾ÙLeader¹ý³ÌÖÐËã·¨Óкܶ࣬µ«Òª´ïµ½µÄÑ¡¾Ù±ê×¼ÊÇÒ»Öµġ£

4¡¢LeaderÒª¾ßÓÐ×î¸ßµÄÖ´ÐÐID£¬ÀàËÆrootȨÏÞ¡£

5¡¢¼¯ÈºÖдó¶àÊýµÄ»úÆ÷µÃµ½ÏìÓ¦²¢followÑ¡³öµÄLeader¡£

zookeeper.jar¿ò¼ÜÌصã:

ÔÚZookeeperÖУ¬znodeÊÇÒ»¸ö¸úUnixÎļþϵͳ·¾¶ÏàËƵĽڵ㣬¿ÉÒÔÍùÕâ¸ö½Úµã´æ´¢»ò»ñÈ¡Êý¾Ý¡£Èç¹ûÔÚ´´½¨znodeʱFlagÉèÖÃΪEPHEMERAL£¬ÄÇôµ±´´½¨Õâ¸öznodeµÄ½ÚµãºÍZookeeperʧȥÁ¬½Óºó£¬Õâ¸öznode½«²»ÔÙ´æÔÚÔÚZookeeperÀZookeeperʹÓÃWatcher²ì¾õʼþÐÅÏ¢¡£µ±¿Í»§¶Ë½ÓÊÕµ½Ê¼þÐÅÏ¢£¬±ÈÈçÁ¬½Ó³¬Ê±¡¢½ÚµãÊý¾Ý¸Ä±ä¡¢×Ó½Úµã¸Ä±ä£¬¿ÉÒÔµ÷ÓÃÏàÓ¦µÄÐÐΪÀ´´¦ÀíÊý¾Ý¡£ZookeeperµÄWikiÒ³ÃæչʾÁËÈçºÎʹÓÃZookeeperÀ´´¦Àíʼþ֪ͨ£¬¶ÓÁУ¬ÓÅÏȶÓÁУ¬Ëø£¬¹²ÏíËø£¬¿É³·ÏúµÄ¹²ÏíËø£¬Á½½×¶ÎÌá½»¡£

ÄÇôZookeeperÄÜ×öʲôÊÂÇéÄØ£¬¼òµ¥µÄÀý×Ó£º¼ÙÉèÎÒÃÇÓÐ20¸öËÑË÷ÒýÇæµÄ·þÎñÆ÷(ÿ¸ö¸ºÔð×ÜË÷ÒýÖеÄÒ»²¿·ÖµÄËÑË÷ÈÎÎñ)ºÍÒ»¸ö×Ü·þÎñÆ÷(¸ºÔðÏòÕâ20¸öËÑË÷ÒýÇæµÄ·þÎñÆ÷·¢³öËÑË÷ÇëÇ󲢺ϲ¢½á¹û¼¯)£¬Ò»¸ö±¸ÓõÄ×Ü·þÎñÆ÷(¸ºÔðµ±×Ü·þÎñÆ÷å´»úʱÌæ»»×Ü·þÎñÆ÷)£¬Ò»¸öwebµÄcgi(Ïò×Ü·þÎñÆ÷·¢³öËÑË÷ÇëÇó)¡£ËÑË÷ÒýÇæµÄ·þÎñÆ÷ÖеÄ15¸ö·þÎñÆ÷ÌṩËÑË÷·þÎñ£¬5¸ö·þÎñÆ÷ÕýÔÚÉú³ÉË÷Òý¡£Õâ20¸öËÑË÷ÒýÇæµÄ·þÎñÆ÷¾­³£ÒªÈÃÕýÔÚÌṩËÑË÷·þÎñµÄ·þÎñÆ÷Í£Ö¹Ìṩ·þÎñ¿ªÊ¼Éú³ÉË÷Òý£¬»òÉú³ÉË÷ÒýµÄ·þÎñÆ÷ÒѾ­°ÑË÷ÒýÉú³ÉÍê³É¿ÉÒÔÌṩËÑË÷·þÎñÁË¡£Ê¹ÓÃZookeeper¿ÉÒÔ±£Ö¤×Ü·þÎñÆ÷×Ô¶¯¸ÐÖªÓжàÉÙÌṩËÑË÷ÒýÇæµÄ·þÎñÆ÷²¢ÏòÕâЩ·þÎñÆ÷·¢³öËÑË÷ÇëÇ󣬵±×Ü·þÎñÆ÷å´»úʱ×Ô¶¯ÆôÓñ¸ÓõÄ×Ü·þÎñÆ÷¡£

zookeeper.jarʹÓ÷½·¨:

1.ÓÒ»÷¡°ÏîÄ¿¡±¡úÑ¡ÔñProperties£¬ÔÚµ¯³öµÄ¶Ô»°¿ò×ó²àÁбíÖÐÑ¡ÔñJava Build Path£¬µ¯³ö¶Ô»°¿ò£¬ÕâÀïÑ¡Ôñ"Add Library"£¬µ¯³ö¶Ô»°¿ò£¬Ñ¡Ôñ"User Library"£¬È»ºóÑ¡Ôñ¡úNext

2.ÔÚ³öÏֵĶԻ°¿òÖУ¬¿ÉÒÔÑ¡ÔñÒѾ­´´½¨ºÃµÄÓû§×Ô¶¨Òå¿â£¬Ò²¿ÉÒÔÑ¡ÔñUser Libraries£¬µ¯³öµÄжԻ°¿òÖÐÑ¡Ôñ"New"£¬´´½¨ÐµÄÓû§×Ô¶¨Òå¿â¡£

3.ÔÚ´ý´´½¨Óû§×Ô¶¨Òå¿âÖУ¬ÊäÈëеÄ×Ô¶¨Òå¿âµÄÃû×Ö,

4.È»ºóΪп⣬Ìí¼ÓËùÐèµÄJar°ü

5.°´ÉÏÊö²½ÖèÌí¼ÓºÃÓû§×Ô¶¨Òå¿âºó£¬ÒÔºó¿ÉÒÔÖØÓÃÕâЩÒѶ¨ÒåºÃµÄUser Library¿â£¬Îª¿ª·¢½Úʡʱ¼ä¡£