The first 3 Turn off ： Node status check 、 Data viewing and updating

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• Mission requirements
• Refer to the answer
• Comment on 15

• Task description
• Related knowledge
  • Node status check
  • Node value view
  • Node data update
• Programming requirements
• Test instructions

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Task description

Our mission ： Master node status check , Node value view , And node data update .

Related knowledge

In order to complete this mission , You need to master ：1. Command line basic operations .

Node status check

First , Need to start the server , And use zkCli.sh Connect to server , Enter the client command line interface （ As mentioned in the first level ）.

The node status contains the following information ：

• czxid: Timestamp of node creation .
• mzxid: The time when the node was last updated .
• ctime： Timestamp of node creation .
• mtime： The time when the node was last updated .
• pZxid： The timestamp of the last creation or deletion of the node or its child nodes .
• dataVersion： Update times of node data .
• cversion： The number of updates of its child nodes .
• aclVersion： node ACL( Authorization information ) Number of updates .
• ephemeralOwner： If the node is ephemeral node , ephemeralOwner The value represents the session id; If the node is not ephemeral node ,ephemeralOwner The value is 0.
• dataLength： Number of bytes of node data .
• numChildren： Number of child nodes .

for example , get /zoo1 Node information of , Use the following command （ As shown in the figure ）：

1. stat /zoo1

Node value view

Get current node value , Use get command , When you get the data , The corresponding node status information will be listed .

for example , obtain /zoo1 The node data of This is a zoo1!, Use the following command （ As shown in the figure ）：

1. get /zoo1

Node data update

When created, the node data is not suitable for the current requirements , You need to update the current node data . Update node data using set command , When updating data , The updated node status information will be listed .

for example , take /zoo1 The node data of This is a zoo1! Updated to This is my zoo1!!!, Use the following command （ As shown in the figure ）：

1. set /zoo1 "This is my zoo1!!!"

Programming requirements

This task is to use the command line , Do the following ：

• Turn on ZooKeeper The server .

• Using client （zkCli.sh） Connect to server （IP：127.0.0.1, Port number ：2181）.

• establish /myZNode, The node data is This is my node! Persistent node of .

• see /myZNode Node status .

• take /myZNode The node data is updated to This is my second node!.

• Look again /myZNode Node status , Compare the similarities and differences with the previous node state .

• Disconnect the customer service terminal from the server .

Test instructions

The test of this level needs to be completed by the user under the command line on the right , The user only needs to directly operate the commands to be completed under the command line on the right , Then click the evaluation button , The platform will automatically verify whether the user checks the results as required .

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Start your mission , wish you success ！

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