文章目錄

• help 查看zookeeper所支持的所有命令
• 創(chuàng)建zookeeper 節(jié)點(diǎn)命令
• • 創(chuàng)建持久化節(jié)點(diǎn) create
  • 查看節(jié)點(diǎn) get
  • 修改節(jié)點(diǎn) set
  • 創(chuàng)建持久序號(hào)節(jié)點(diǎn)，加參數(shù) -s
  • 創(chuàng)建臨時(shí)節(jié)點(diǎn)，加參數(shù) -e
  • 創(chuàng)建臨時(shí)序號(hào)節(jié)點(diǎn), 加參數(shù) -s -e
  • 創(chuàng)建容器節(jié)點(diǎn) -c
• 查看節(jié)點(diǎn)屬性信息 stat
• 查看節(jié)點(diǎn)狀態(tài)信息同時(shí)查看數(shù)據(jù) get -s

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help 查看zookeeper所支持的所有命令

[zk: localhost:2181(CONNECTED) 1] help ZooKeeper -server host:port cmd argsaddauth scheme authclose config [-c] [-w] [-s]connect host:portcreate [-s] [-e] [-c] [-t ttl] path [data] [acl]delete [-v version] pathdeleteall pathdelquota [-n|-b] pathget [-s] [-w] pathgetAcl [-s] pathhistory listquota pathls [-s] [-w] [-R] pathls2 path [watch]printwatches on|offquit reconfig [-s] [-v version] [[-file path] | [-members serverID=host:port1:port2;port3[,...]*]] | [-add serverId=host:port1:port2;port3[,...]]* [-remove serverId[,...]*]redo cmdnoremovewatches path [-c|-d|-a] [-l]rmr pathset [-s] [-v version] path datasetAcl [-s] [-v version] [-R] path aclsetquota -n|-b val pathstat [-w] pathsync path Command not found: Command not found help [zk: localhost:2181(CONNECTED) 2]

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創(chuàng)建zookeeper 節(jié)點(diǎn)命令

create [-s] [-e] [-c] [-t ttl] path [data] [acl]

中括號(hào)為可選項(xiàng)，沒(méi)有則默認(rèn)創(chuàng)建持久化節(jié)點(diǎn)

• -s: 順序節(jié)點(diǎn)
• -e: 臨時(shí)節(jié)點(diǎn)
• -c: 容器節(jié)點(diǎn)
• -t: 可以給節(jié)點(diǎn)添加過(guò)期時(shí)間，默認(rèn)禁用，需要通過(guò)系統(tǒng)參數(shù)啟用

（-Dzookeeper.extendedTypesEnabled=true, znode.container.checkIntervalMs : (Java system property only) New in 3.5.1: The time interval in milliseconds for each check of candidate container and ttl nodes. Default is “60000”.)

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創(chuàng)建持久化節(jié)點(diǎn) create

持久化保存的節(jié)點(diǎn)，也是默認(rèn)創(chuàng)建的

[zk: localhost:2181(CONNECTED) 1] create /artisan-persist data_xxx Created /artisan-persist

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查看節(jié)點(diǎn) get

[zk: localhost:2181(CONNECTED) 3] get /artisan-persist data_xxx [zk: localhost:2181(CONNECTED) 4]

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修改節(jié)點(diǎn) set

[zk: localhost:2181(CONNECTED) 4] set /artisan-persist data_xxx_new [zk: localhost:2181(CONNECTED) 5] [zk: localhost:2181(CONNECTED) 5] [zk: localhost:2181(CONNECTED) 5] [zk: localhost:2181(CONNECTED) 5] get /artisan-persist data_xxx_new [zk: localhost:2181(CONNECTED) 6]

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創(chuàng)建持久序號(hào)節(jié)點(diǎn)，加參數(shù) -s

創(chuàng)建時(shí)zookeeper 會(huì)在路徑上加上序號(hào)作為后綴，。非常適合用于分布式鎖、分布式選舉等場(chǎng)景。創(chuàng)建時(shí)添加 -s 參數(shù)即可。

[zk: localhost:2181(CONNECTED) 11] create -s /artisan_seq Created /artisan_seq0000000002 [zk: localhost:2181(CONNECTED) 12] [zk: localhost:2181(CONNECTED) 12] create -s /artisan_seq Created /artisan_seq0000000003 [zk: localhost:2181(CONNECTED) 13] create -s /artisan_seq Created /artisan_seq0000000004 [zk: localhost:2181(CONNECTED) 14] create -s /artisan_seq Created /artisan_seq0000000005 [zk: localhost:2181(CONNECTED) 15] create -s /artisan_seq Created /artisan_seq0000000006 [zk: localhost:2181(CONNECTED) 16] ls -R / / /artisan-persist /artisan_seq0000000002 /artisan_seq0000000003 /artisan_seq0000000004 /artisan_seq0000000005 /artisan_seq0000000006 /zookeeper /zookeeper/config /zookeeper/quota [zk: localhost:2181(CONNECTED) 17]

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創(chuàng)建臨時(shí)節(jié)點(diǎn)，加參數(shù) -e

臨時(shí)節(jié)點(diǎn)會(huì)在客戶(hù)端會(huì)話(huà)斷開(kāi)后自動(dòng)刪除。適用于心跳，服務(wù)發(fā)現(xiàn)等場(chǎng)景。創(chuàng)建時(shí)添加參數(shù)-e 即可。

創(chuàng)建臨時(shí)節(jié)點(diǎn)， 斷開(kāi)會(huì)話(huà) 在連接將會(huì)自動(dòng)刪除

[zk: localhost:2181(CONNECTED) 17] create -e /artisan-e Created /artisan-e

[zk: localhost:2181(CONNECTED) 20] ls -R /artisan-e /artisan-e [zk: localhost:2181(CONNECTED) 21]

退出重連

臨時(shí)節(jié)點(diǎn)沒(méi)啦。。。。

我們結(jié)合日志來(lái)看一下

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創(chuàng)建臨時(shí)序號(hào)節(jié)點(diǎn), 加參數(shù) -s -e

與持久序號(hào)節(jié)點(diǎn)類(lèi)似，不同之處在于EPHEMERAL_SEQUENTIAL是臨時(shí)的會(huì)在會(huì)話(huà)斷開(kāi)后刪除。創(chuàng)建時(shí)添加 -e -s

語(yǔ)法

[zk: localhost:2181(CONNECTED) 1] create -s -e /abc Created /abc0000000008 [zk: localhost:2181(CONNECTED) 2] create -s -e /abc Created /abc0000000009 [zk: localhost:2181(CONNECTED) 3] create -s -e /abc Created /abc0000000010 [zk: localhost:2181(CONNECTED) 4] create -s -e /abc Created /abc0000000011 [zk: localhost:2181(CONNECTED) 5] create -s -e /abc Created /abc0000000012 [zk: localhost:2181(CONNECTED) 6] ls -R / / /abc0000000008 /abc0000000009 /abc0000000010 /abc0000000011 /abc0000000012 /artisan-persist /artisan_seq0000000002 /artisan_seq0000000003 /artisan_seq0000000004 /artisan_seq0000000005 /artisan_seq0000000006 /zookeeper /zookeeper/config /zookeeper/quota [zk: localhost:2181(CONNECTED) 7]

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創(chuàng)建容器節(jié)點(diǎn) -c

容器節(jié)點(diǎn)主要用來(lái)容納字節(jié)點(diǎn)，如果沒(méi)有給其創(chuàng)建子節(jié)點(diǎn)，容器節(jié)點(diǎn)表現(xiàn)和持久化節(jié)點(diǎn)一樣，如果給容器節(jié)點(diǎn)創(chuàng)建了子節(jié)點(diǎn)，后續(xù)又把子節(jié)點(diǎn)清空，容器節(jié)點(diǎn)也會(huì)被zookeeper刪除。

[zk: localhost:2181(CONNECTED) 14] create -c /artisan-c Created /artisan-c

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查看節(jié)點(diǎn)屬性信息 stat

[zk: localhost:2181(CONNECTED) 6] stat /artisan-persist cZxid = 0xa ctime = Mon Nov 16 23:07:37 CST 2020 mZxid = 0xb mtime = Mon Nov 16 23:08:55 CST 2020 pZxid = 0xa cversion = 0 dataVersion = 1 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 12 numChildren = 0 [zk: localhost:2181(CONNECTED) 7]

• cZxid：創(chuàng)建znode的事務(wù)ID（Zxid的值）。
• mZxid：最后修改znode的事務(wù)ID。
• pZxid：最后添加或刪除子節(jié)點(diǎn)的事務(wù)ID（子節(jié)點(diǎn)列表發(fā)生變化才會(huì)發(fā)生改變）。
• ctime：znode創(chuàng)建時(shí)間。
• mtime：znode最近修改時(shí)間。
• dataVersion：znode的當(dāng)前數(shù)據(jù)版本。
• cversion：znode的子節(jié)點(diǎn)結(jié)果集版本（一個(gè)節(jié)點(diǎn)的子節(jié)點(diǎn)增加、刪除都會(huì)影響這個(gè)版本）。
• aclVersion：表示對(duì)此znode的acl版本。
• ephemeralOwner：znode是臨時(shí)znode時(shí)，表示znode所有者的 session ID。 如果znode不是臨時(shí)znode，則該字段設(shè)置為零。
• dataLength：znode數(shù)據(jù)字段的長(zhǎng)度。
• numChildren：znode的子znode的數(shù)量。

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查看節(jié)點(diǎn)狀態(tài)信息同時(shí)查看數(shù)據(jù) get -s

[zk: localhost:2181(CONNECTED) 9] get -s /artisan-persist data_xxx_new cZxid = 0xa ctime = Mon Nov 16 23:07:37 CST 2020 mZxid = 0xb mtime = Mon Nov 16 23:08:55 CST 2020 pZxid = 0xa cversion = 0 dataVersion = 1 aclVersion = 0 ephemeralOwner = 0x0 dataLength = 12 numChildren = 0 [zk: localhost:2181(CONNECTED) 10]

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