Consumer groups concept in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a consumer group named 'mygroup' for the stream 'mystream'.

Redis

XGROUP CREATE mystream [1] $ MKSTREAM

Drag options to blanks, or click blank then click option'

Agroup1

Bmygroup

Cstreamgroup

DconsumerA

Attempts:

3 left

💡 Hint

Common Mistakes

Using a consumer name instead of a group name.

Confusing the stream name with the group name.

The XGROUP CREATE command creates a consumer group. The group name here is 'mygroup'.

2fill in blank

medium

Complete the code to read messages from the stream 'mystream' using consumer group 'mygroup' and consumer 'consumer1'.

Redis

XREADGROUP GROUP mygroup [1] COUNT 10 STREAMS mystream >

Drag options to blanks, or click blank then click option'

AconsumerA

Bgroup1

Cconsumer1

Dmystream

Attempts:

3 left

💡 Hint

Common Mistakes

Using the group name instead of the consumer name.

Using the stream name instead of the consumer name.

The XREADGROUP command requires the consumer name after the group name. Here, 'consumer1' is the consumer reading messages.

3fill in blank

hard

Fix the error in the command to acknowledge a message with ID '1526985058136-0' in group 'mygroup' on stream 'mystream'.

Redis

XACK mystream mygroup [1]

Drag options to blanks, or click blank then click option'

A1526985058136-0

Bconsumer1

Cmystream

Dmygroup

Attempts:

3 left

💡 Hint

Common Mistakes

Using the consumer or group name instead of the message ID.

Using the stream name as the message ID.

The XACK command acknowledges a message by its ID. The message ID '1526985058136-0' must be provided.

4fill in blank

hard

Fill both blanks to claim pending messages for consumer 'consumer2' in group 'mygroup' on stream 'mystream' that have been idle for more than 60000 milliseconds.

Redis

XCLAIM mystream mygroup [1] 60000 [2]

Drag options to blanks, or click blank then click option'

Aconsumer2

B1526985058136-0

Cconsumer1

D1526985058137-0

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping consumer names or message IDs.

Using a wrong message ID that does not exist.

The XCLAIM command requires the consumer name and the message ID to claim pending messages. Here, 'consumer2' claims the message '1526985058136-0'.

5fill in blank

hard

Fill all three blanks to get the list of consumers in group 'mygroup' for stream 'mystream' and count their pending messages.

Redis

XINFO CONSUMERS [1] [2] | awk '{{print $1, $[3]'

Drag options to blanks, or click blank then click option'

Amystream

Bmygroup

C7

D8

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up stream and group names.

Using the wrong field number in awk.

The XINFO CONSUMERS command lists consumers for a group. The stream is 'mystream', the group is 'mygroup'. The awk command prints the first and eighth fields, where the eighth field is the pending message count.