Client-side cluster support in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to connect to a Redis cluster using the client.

Redis

const cluster = new Redis.Cluster([1]);

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A[{ host: '127.0.0.1', port: 7000 }]

B'127.0.0.1:7000'

C{ host: '127.0.0.1', port: 7000 }

D7000

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a single string instead of an array.

Passing a single object instead of an array.

Passing only the port number.

You need to provide an array of node objects with host and port to connect to a Redis cluster.

2fill in blank

medium

Complete the code to execute a command on the Redis cluster client.

Redis

cluster.[1]('set', 'key', 'value');

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Aexecute

Bcall

CsendCommand

Drun

Attempts:

3 left

💡 Hint

Common Mistakes

Using execute or call which are not valid methods.

Using run which does not exist.

The sendCommand method is used to send commands to the Redis cluster client.

3fill in blank

hard

Fix the error in the code to properly handle cluster node errors.

Redis

cluster.on('error', [1] => { console.error('Cluster error:', err); });

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Aerror

Berr

Ce

Dexception

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different parameter name than the one used inside the function.

Not matching the parameter name with the error object.

The error event handler receives the error object as the parameter, commonly named err.

4fill in blank

hard

Fill both blanks to create a command that gets the value of a key from the cluster.

Redis

const value = await cluster.[1]('get', [2]);

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AsendCommand

B'mykey'

C'key1'

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

Using execute instead of sendCommand.

Passing the wrong key string.

Use sendCommand to send the 'get' command and provide the key as a string.

5fill in blank

hard

Fill all three blanks to create a cluster client, set a key, and get its value.

Redis

const cluster = new Redis.Cluster([1]);
await cluster.[2]('set', 'name', 'Alice');
const name = await cluster.[3]('get', 'name');

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A[{ host: 'localhost', port: 7001 }]

BsendCommand

D[{ host: '127.0.0.1', port: 6379 }]

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong node addresses.

Using different methods instead of sendCommand.

First, create the cluster client with an array of nodes. Then use sendCommand to set and get keys.