---
id: ff29b4db-60ae-4c78-854c-392f86aaae97
---

# Redis Pub/Sub delivery delays incident.
---

This incident type relates to the Redis Pub/Sub system, which is responsible for delivering messages between different systems. When this system experiences delays in delivery, it can cause disruptions in the communication between systems and slow down processes that rely on real-time data exchange. This can lead to issues such as data loss, missed deadlines, and reduced efficiency. The incident requires immediate attention to restore the system's normal functionality and mitigate any negative impact on the affected systems.

### Parameters
```shell
export CHANNEL_NAME="PLACEHOLDER"

export REDIS_TIMEOUT_VALUE="PLACEHOLDER"

export REDIS_BUFFER_SIZE_VALUE="PLACEHOLDER"
```

## Debug

### Check Redis server status
```shell
redis-cli ping
```

### List all Redis channels
```shell
redis-cli channels
```

### Check Redis subscriber count for a particular channel
```shell
redis-cli pubsub numsub ${CHANNEL_NAME}
```

### Check Redis subscriber list for a particular channel
```shell
redis-cli pubsub channels ${CHANNEL_NAME}
```

### Check Redis messages queued for a particular channel
```shell
redis-cli llen ${CHANNEL_NAME}
```

### Monitor Redis messages in real-time for a particular channel
```shell
redis-cli monitor | grep ${CHANNEL_NAME}
```

## Repair

### Ensure that Redis is properly configured and tuned for optimal performance. This includes setting appropriate timeouts, buffer sizes, and other configuration parameters.
```shell


#!/bin/bash



# Set Redis configuration parameters

redis_config_file="/etc/redis/redis.conf"

redis_timeout="${REDIS_TIMEOUT_VALUE}"

redis_buffer_size="${REDIS_BUFFER_SIZE_VALUE}"



# Update Redis configuration file with new parameters

sed -i "s/^timeout .*/timeout $redis_timeout/" $redis_config_file

sed -i "s/^tcp-backlog .*/tcp-backlog $redis_buffer_size/" $redis_config_file



# Restart Redis service

service redis restart


```

This incident type relates to the Redis Pub/Sub system, which is responsible for delivering messages between different systems. When this system experiences delays in delivery, it can cause disruptions in the communication between systems and slow down processes that rely on real-time data exchange. This can lead to issues such as data loss, missed deadlines, and reduced efficiency. The incident requires immediate attention to restore the system's normal functionality and mitigate any negative impact on the affected systems.


```shell
export CHANNEL_NAME="PLACEHOLDER"

export REDIS_TIMEOUT_VALUE="PLACEHOLDER"

export REDIS_BUFFER_SIZE_VALUE="PLACEHOLDER"
```


### Check Redis server status

```shell
redis-cli ping
```

### List all Redis channels

```shell
redis-cli channels
```

### Check Redis subscriber count for a particular channel

```shell
redis-cli pubsub numsub ${CHANNEL_NAME}
```

### Check Redis subscriber list for a particular channel

```shell
redis-cli pubsub channels ${CHANNEL_NAME}
```

### Check Redis messages queued for a particular channel

```shell
redis-cli llen ${CHANNEL_NAME}
```

### Monitor Redis messages in real-time for a particular channel

```shell
redis-cli monitor | grep ${CHANNEL_NAME}
```


### Ensure that Redis is properly configured and tuned for optimal performance. This includes setting appropriate timeouts, buffer sizes, and other configuration parameters.

```shell


#!/bin/bash



# Set Redis configuration parameters

redis_config_file="/etc/redis/redis.conf"

redis_timeout="${REDIS_TIMEOUT_VALUE}"

redis_buffer_size="${REDIS_BUFFER_SIZE_VALUE}"



# Update Redis configuration file with new parameters

sed -i "s/^timeout .*/timeout $redis_timeout/" $redis_config_file

sed -i "s/^tcp-backlog .*/tcp-backlog $redis_buffer_size/" $redis_config_file



# Restart Redis service

service redis restart


```


Redis Pub/Sub delivery delays incident.

Overview

Parameters

Debug

Check Redis server status

List all Redis channels

Check Redis subscriber count for a particular channel

Check Redis subscriber list for a particular channel

Check Redis messages queued for a particular channel

Monitor Redis messages in real-time for a particular channel

Repair

Ensure that Redis is properly configured and tuned for optimal performance. This includes setting appropriate timeouts, buffer sizes, and other configuration parameters.

Learn more

Related Runbooks

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