{"id":20760,"date":"2018-07-22T03:53:04","date_gmt":"2018-07-22T03:53:04","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=20760"},"modified":"2021-05-19T18:24:07","modified_gmt":"2021-05-19T12:54:07","slug":"zookeeper-cli","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/zookeeper-cli\/","title":{"rendered":"Apache ZooKeeper CLI (Command Line Interface) Operations"},"content":{"rendered":"

In our last Apache ZooKeeper Tutorial<\/strong>, we discussed ZooKeeper Leader Election<\/strong>. Today, we will see ZooKeeper CLI. In this Zookeeper article, we will learn the whole about ZooKeeper Command Line Interface. First, we will see what is CLI in ZooKeeper. <\/span><\/p>\n

Also, we will discuss commands in ZooKeeper CLI. Also, there are several operations we can perform with the ZooKeeper ensemble for development purpose, we will also discuss all in detail. <\/span><\/p>\n

So, let\u2019s start Apache ZooKeeper CLI.<\/span><\/p>\n

What is ZooKeeper Command Line Interface?<\/span><\/h2>\n

For development purpose, we can interact with the ZooKeeper ensemble, so, for that, we use ZooKeeper CLI (Command Line Interface). Its main purpose is for debugging and working around with different options.<\/span><\/p>\n

In order to perform ZooKeeper CLI operations, at very first we have to turn on our ZooKeeper server (\u201cbin\/zkServer.sh start\u201d). Afterward, we will also turn on ZooKeeper client<\/strong> (\u201cbin\/zkCli.sh\u201d). Hence, we can perform the following operation, once the client starts:<\/span><\/p>\n

    \n
  1. Create znodes.<\/span><\/li>\n
  2. Get data.<\/span><\/li>\n
  3. Watch znode for changes.<\/li>\n
  4. Set data.<\/span><\/li>\n
  5. Create children of a znode.<\/span><\/li>\n
  6. List children of a znode.<\/span><\/li>\n
  7. Check Status.<\/li>\n
  8. Remove \/ Delete a znode.<\/li>\n<\/ol>\n

    Commands in ZooKeeper CLI<\/span><\/h2>\n

    Let’s discuss ZooKeeper CLI Commands in detail:<\/p>\n

    \"ZooKeeper<\/a>

    Commands in ZooKeeper CLI<\/p><\/div>\n

    i. Create Znodes<\/span><\/h3>\n

    At very first, with the given path, create a znode. Basically, the flag argument specifies whether the created Znode will be ephemeral, persistent, or sequential. However, all znodes are persistent, by default.<\/span><\/p>\n

    In addition, when a session expires or when the client disconnects, Ephemeral znodes (flag:e) will be automatically deleted.<\/span><\/p>\n

    Although, Sequential znodes make sure that the Znode path will be unique.<\/span><\/p>\n

    Along with 10 digit padding to the znode path, ZooKeeper ensemble will add the sequence number. For example, the znode path \/myapp will be converted to \/myapp0000000001 and the next sequence number will be \/myapp0000000002. If no flags are specified, then the znode is considered as persistent.<\/span><\/p>\n

    a. Syntax<\/span><\/p>\n

    create \/path \/data<\/pre>\n
    b. Sample<\/span><\/p>\n
    create \/FirstZnode \u201cMyfirstzookeeper-app\u201d<\/pre>\n
    c. Output<\/span><\/p>\n
    [zk: localhost:2181(CONNECTED) 0] create \/FirstZnode \u201cMyfirstzookeeper-app\u201d\r\nCreated \/FirstZnode<\/pre>\n
    Now, add -s flag, in order to create a Sequential znode:<\/span>
    \na. Syntax<\/span><\/p>\n
    create -s \/path \/data<\/pre>\n
    b. Sample<\/span>
    \n<\/b><\/p>\n
    create -s \/FirstZnode second-data<\/pre>\n
    c. Output<\/span><\/p>\n
    [zk: localhost:2181(CONNECTED) 2] create -s \/FirstZnode \u201csecond-data\u201d\r\nCreated \/FirstZnode0000000023<\/pre>\n
    Further, add -e flag, to create an Ephemeral Znode:<\/span>
    \na. Syntax<\/span><\/p>\n
    create -e \/path \/data<\/pre>\n
    b. Sample<\/span><\/p>\n
    create -e \/SecondZnode \u201cEphemeral-data\u201d<\/pre>\n
    c. Output<\/span><\/p>\n
    [zk: localhost:2181(CONNECTED) 2] create -e \/SecondZnode \u201cEphemeral-data\u201d\r\nCreated \/SecondZnode<\/pre>\n
    Although, make sure the ephemeral znode will be deleted when a client connection is lost. So, by quitting the ZooKeeper CLI and then re-opening the CLI, we can try it.<\/span><\/p>\n
    ii. Get Data<\/span><\/h3>\n
    In order to get the associated data of the znode as well as metadata of the specified znode, we use this operation. Information like when the data was last modified, where it was modified, and all the information about the data, we can get from it. <\/span><\/p>\n
    In addition, to assign watches to show notification about the data, we use this ZooKeper CLI Command.<\/span><\/p>\n
    a. Syntax<\/span><\/p>\n
    get \/path<\/pre>\n
    b. Sample<\/span><\/p>\n
    get \/FirstZnode<\/pre>\n
    c. Output<\/span><\/p>\n
    [zk: localhost:2181(CONNECTED) 1] get \/FirstZnode\r\n\u201cMyfirstzookeeper-app\u201d\r\ncZxid = 0x7f\r\nctime = Tue Sep 29 16:15:47 IST 2015\r\nmZxid = 0x7f\r\nmtime = Tue Sep 29 16:15:47 IST 2015\r\npZxid = 0x7f\r\ncversion = 0\r\ndataVersion = 0\r\naclVersion = 0\r\nephemeralOwner = 0x0\r\ndataLength = 22\r\nnumChildren = 0<\/pre>\n
    Though, we must enter the full path of the znode, to access a sequential znode:<\/span>
    \na. Sample<\/span><\/p>\n
    get \/FirstZnode0000000023<\/pre>\n
    b. Output<\/span><\/p>\n
    [zk: localhost:2181(CONNECTED) 1] get \/FirstZnode0000000023\r\n\u201cSecond-data\u201d\r\ncZxid = 0x80\r\nctime = Tue Sep 29 16:25:47 IST 2015\r\nmZxid = 0x80\r\nmtime = Tue Sep 29 16:25:47 IST 2015\r\npZxid = 0x80\r\ncversion = 0\r\ndataVersion = 0\r\naclVersion = 0\r\nephemeralOwner = 0x0\r\ndataLength = 13\r\nnumChildren = 0<\/pre>\n
    iii. Watch<\/span><\/h3>\n
    when the specified znode or znode\u2019s children data changes, the operatipon “Watches” show a notification. However, only in get command,\u00a0we can set a watch.<\/span><\/p>\n
    a. Syntax<\/span><\/p>\n
    get \/path [watch] 1<\/pre>\n
    b. Sample<\/span><\/p>\n
    get \/FirstZnode 1<\/pre>\n
    c. Output<\/span><\/p>\n
    [zk: localhost:2181(CONNECTED) 1] get \/FirstZnode 1\r\n\u201cMyfirstzookeeper-app\u201d\r\ncZxid = 0x7f\r\nctime = Tue Sep 29 16:15:47 IST 2015\r\nmZxid = 0x7f\r\nmtime = Tue Sep 29 16:15:47 IST 2015\r\npZxid = 0x7f\r\ncversion = 0\r\ndataVersion = 0\r\naclVersion = 0\r\nephemeralOwner = 0x0\r\ndataLength = 22\r\nnumChildren = 0<\/pre>\n
    Although, make sure the output for watch operation is\u00a0same as normal get command,\u00a0though it will wait for Znode changes in the background. <Start here><\/span><\/p>\n
    iv. Set Data<\/span><\/h3>\n
    As per its name, this operations sets the data of the specified znode.\u00a0We can check the data using the get CLI command in ZooKeeper, once\u00a0we finish this ZooKeeper set operation.<\/span>
    \na. Syntax<\/span><\/p>\n
    set \/path \/data<\/pre>\n
    b. Sample<\/span>
    \n<\/b><\/p>\n
    set \/SecondZnode Data-updated<\/pre>\n
    c. Output<\/span><\/p>\n
    [zk: localhost:2181(CONNECTED) 1] get \/SecondZnode \u201cData-updated\u201d\r\ncZxid = 0x82\r\nctime = Tue Sep 29 16:29:50 IST 2015\r\nmZxid = 0x83\r\nmtime = Tue Sep 29 16:29:50 IST 2015\r\npZxid = 0x82\r\ncversion = 0\r\ndataVersion = 1\r\naclVersion = 0\r\nephemeralOwner = 0x15018b47db00000\r\ndataLength = 14\r\nnumChildren = 0<\/pre>\n
    If\u00a0we assign watch option in ZooKeeper CLI getting command, its output will be as same as below \u2212<\/span><\/p>\n
    d. Output<\/span><\/p>\n
    [zk: localhost:2181(CONNECTED) 1] get \/FirstZnode \u201cMysecondzookeeper-app\u201d\r\nWATCHER: :\r\nWatchedEvent state:SyncConnected type:NodeDataChanged path:\/FirstZnode\r\ncZxid = 0x7f\r\nctime = Tue Sep 29 16:15:47 IST 2015\r\nmZxid = 0x84\r\nmtime = Tue Sep 29 17:14:47 IST 2015\r\npZxid = 0x7f\r\ncversion = 0\r\ndataVersion = 1\r\naclVersion = 0\r\nephemeralOwner = 0x0\r\ndataLength = 23\r\nnumChildren = 0<\/pre>\n
    v. Create Children \/ Sub-znode<\/span><\/h3>\n
    Basically, creating children is\u00a0as same as creating new znodes. However, the only difference in both is that the path of the child znode will have the parent path as well.<\/span>
    \na. Syntax<\/span><\/p>\n
    create \/parent\/path\/subnode\/path \/data<\/pre>\n
    b. Sample<\/span>
    \n<\/b><\/p>\n
    create \/FirstZnode\/Child1 firstchildren<\/pre>\n
    <\/b>c. Output<\/span><\/p>\n
    [zk: localhost:2181(CONNECTED) 16] create \/FirstZnode\/Child1 \u201cfirstchildren\u201d\r\ncreated \/FirstZnode\/Child1\r\n[zk: localhost:2181(CONNECTED) 17] create \/FirstZnode\/Child2 \u201csecondchildren\u201d\r\ncreated \/FirstZnode\/Child2<\/pre>\n
    vi. List Children<\/span><\/h3>\n
    In order to list and display the children of a znode, we use this List Children ZooKeeper CLI command.<\/span>
    \na. Syntax<\/span><\/p>\n
    ls \/path<\/pre>\n
    b. Sample<\/span><\/p>\n
    ls \/MyFirstZnode<\/pre>\n
    c. Output<\/span><\/p>\n
    [zk: localhost:2181(CONNECTED) 2] ls \/MyFirstZnode\r\n[mysecondsubnode, myfirstsubnode]\r\n<\/pre>\n
    vii. Check Status<\/span><\/h3>\n
    Here, Status\u00a0refers to the metadata of a specified znode. It consists of several details like Timestamp, Version number, ACL, Data length, and Children znode\u00a0as well.<\/span>
    \na. Syntax<\/span><\/p>\n
    stat \/path<\/pre>\n
    b. Sample<\/span><\/p>\n
    stat \/FirstZnode<\/pre>\n
    c. Output<\/span><\/p>\n
    [zk: localhost:2181(CONNECTED) 1] stat \/FirstZnode\r\ncZxid = 0x7f\r\nctime = Tue Sep 29 16:15:47 IST 2015\r\nmZxid = 0x7f\r\nmtime = Tue Sep 29 17:14:24 IST 2015\r\npZxid = 0x7f\r\ncversion = 0\r\ndataVersion = 1\r\naclVersion = 0\r\nephemeralOwner = 0x0\r\ndataLength = 23\r\nnumChildren = 0<\/pre>\n
    viii. Remove a Znode<\/span><\/h3>\n
    The operation, “Remove a Znode”, removes a specified znode and recursively all its children as well. However, only if such a znode is available, this would happen.<\/span><\/p>\n
    a. Syntax<\/p>\n
    rmr \/path<\/pre>\n
    b. Sample
    \n<\/b><\/p>\n
    rmr \/FirstZnode<\/pre>\n
    c. Output<\/p>\n
    [zk: localhost:2181(CONNECTED) 10] rmr \/FirstZnode\r\n[zk: localhost:2181(CONNECTED) 11] get \/FirstZnode\r\nNode does not exist: \/FirstZnode<\/pre>\n
    Though we can say except for the fact that it works only on znodes with no children, Delete (delete \/path) command is\u00a0same as remove command in Apache ZooKeeper Command-Line Interface.<\/span><\/p>\n
    So, this was all in ZooKeeper CLI. Hope you like our explanation of ZooKeeper Command-Line Operations.<\/p>\n
    Conclusion<\/span><\/h2>\n
    Hence, in this ZooKeeper CLI tutorial, we discussed all the operations and the concept of ZooKeeper Command Line Interface. Hope it helps. Still, if any doubt regarding Apache ZooKeeper CLI, ask in the comment tab.<\/p>\n","protected":false},"excerpt":{"rendered":"
    In our last Apache ZooKeeper Tutorial, we discussed ZooKeeper Leader Election. Today, we will see ZooKeeper CLI. In this Zookeeper article, we will learn the whole about ZooKeeper Command Line Interface. First, we will...<\/p>\n","protected":false},"author":7,"featured_media":20831,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77],"tags":[2489,2565,2566,2679,3054,3107,5078,8317,9346,11510,12765,15420,16376,16377,16378,16380,16383],"class_list":["post-20760","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-zookeeper","tag-check-status","tag-cli-in-apache-zookeeper","tag-cli-in-zookeeper","tag-commands-in-zookeeper-cli","tag-create-children-sub-znode","tag-create-znodes","tag-get-data","tag-list-children","tag-output","tag-remove-a-znode","tag-set-data","tag-watch","tag-zookeeper-cli","tag-zookeeper-cli-commands","tag-zookeeper-client","tag-zookeeper-copy-znode","tag-zookeeper-delete-all-data"],"yoast_head":"\nApache ZooKeeper CLI (Command Line Interface) Operations - DataFlair<\/title>\n<meta name=\"description\" content=\"ZooKeeper CLI tutorial, What is ZooKeeper Command-Line Interface, commands in ZooKeeper CLI, CLI in ZooKeeper Operations, ZooKeeper tutorial.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/data-flair.training\/blogs\/zookeeper-cli\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Apache ZooKeeper CLI (Command Line Interface) Operations - 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