> For the complete documentation index, see [llms.txt](https://ztrust.gitbook.io/livestreamiq/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ztrust.gitbook.io/livestreamiq/readme/3.-guide-to-navigation/3.4-cluster-overview/3.4.4-topic.md).
# 3.4.4 Topic
Topic in Kafka is a logical channel used to organize and store messages. Producers publish messages to a topic, and consumers read messages from the same topic for data processing.
1. **Topic Name:** The unique name of the Kafka topic that stores messages.
2. **Partition:** A division of a topic that enables parallel data storage and processing.
3. **Out of sync replicas:** The number of replicas that are not synchronized with the leader partition.
4. **Replication Factor:** The total number of copies of each partition maintained across brokers.
5. **Number of Messages:** The total number of messages currently stored in the topic.
6. **Size:** The total storage space used by the topic and its messages.
7. **Show Internal Topics:** Displays Kafka's internal topics used for managing cluster operations.
### **I. Topic Management**
The Topic Management module enables administrators to create, view, search, and manage Kafka topics within a selected cluster. It also provides detailed information about each topic, including configuration, partitions, messages, consumers, and runtime statistics.
1. **To Accessing Topic Management**\
\
Step 1: From the Select Clusters dropdown, choose the Kafka cluster you want to manage.
\
Step 2: Click the Topic tab. The Topics page displays all available topics within the selected cluster.
2. **Topics List**\
\
The Topics page provides a complete overview of all Kafka topics available in the selected cluster.
| Column | Description |
| -------------------- | ----------------------------------------------- |
| Topic Name | Name of the Kafka topic |
| Partitions | Number of partitions assigned to the topic |
| Out of Sync Replicas | Number of replicas that are not synchronized |
| Replication Factor | Number of copies maintained for fault tolerance |
| Number of Messages | Total messages stored in the topic |
| Size | Storage consumed by the topic |
3. **Searching for a Topic**\
Use the search bar to quickly locate a topic. Enter the topic name into the Search by Topic Name field.
4. **Viewing Internal Topics**\
\
Kafka creates internal topics for system operations.
\
To display internal topics:
1. Enable the **Show Internal Topics** toggle.
2. Internal topics such as **\_\_consumer\_offsets** become visible.
3. When the user **turn-on** the button it showing all the internal topics.
5. **To Creating a New Topic**\
\
Step 1 :Click on the Add a topic button.
\
Step 2 : After clicking the button, the following page opens.
\
Step 3- Fill the topic configuration details as per the user requirement.
1. **Topic Name:** Enter a unique name for the topic.
2. **Number of Partitions**: Specify the number of partitions for the topic. Higher partitions improve parallel processing.
3. **Cleanup Policy:** Select how old messages should be handled.
1. Delete – Messages are removed after the retention period.
2. Compact (if available) – Retains only the latest record for each key.
4. **Min In Sync Replicas:** Enter the minimum number of replicas that must acknowledge a write.
5. **Replication Factor:** Specify the number of replicas to maintain for each partition. The replication factor should not exceed the number of brokers.
6. **Time to Retain Data (ms):** Set the message retention period in milliseconds or use the predefined options.
7. **Max Size on Disk (GB):** Specify the maximum disk space allocated for the topic.
8. **Maximum Message Size (Bytes):** Define the maximum size allowed for a single message.
9. **Custom Parameters:** Add additional topic configuration parameters, if required.when you Add Custom Parameter opens two fields.
1. **Create Topic:** Click to create the topic with the specified configuration.
2. **Cancel:** Click to discard the changes and return to the previous page.
*After entering all the required information, the Create Topic button becomes enabled. Click the button to create the new Kafka topic successfully.*
6. To View Individual Topic Details
1. Click the required topic to view its detailed information.
2. Upon clicking on the individual topics, the user finds the below tabs of that topic.
1. **Overview Tab:** The Overview tab displays the overall health and configuration of the topic.
2. **Messages Tab:** The Messages tab allows users to browse and search messages stored within the topic.
\
Other Available options include:
1. Search by key or value
2. Select Key Serializer
3. Select Value Serializer
4. Choose partition
5. Select message retrieval order (Newest or Oldest)
3. **Consumers Tab:** The Consumers tab displays consumer groups subscribed to the selected topic. This monitors consumer activity and processing lag.
4. **Settings Tab:** The Settings tab displays all Kafka configuration properties associated with the topic.
\
Each configuration includes:
| Column | Description |
| ------------- | ----------------------------------- |
| Key | Kafka configuration property |
| Value | Configured value |
| Default Value | Kafka default value (if applicable) |
5. **Statistics Tab:** The Statistics tab provides runtime metrics for the topic.\
\
After click on '**Start Analysis**', it will produce the runtime metrics analysis.
7. Produce Messages\
\
Messages can be published directly to a topic.
\
Step 1 - Open the topic.\
Step 2 - Click Produce Message.\
Step 3 - Enter the required message details.\
Typical fields include:
1. Key (optional)
2. Value (required)
3. Headers (if supported)
Step 4 - Click Send or Produce.\
\
The message is published to the selected topic.
8. To Copy Topic\
\
Step 1 - Select a topic.\
Step 2 - Click Copy Selected Topic.\
Step 3 - Specify the new topic name and configuration.\
Step 4 - Confirm the operation.
9. To Purge Messages\
\
Step 1 - Select a topic.\
Step 2 - Click Purge Messages of Selected Topics.\
Step 3 - Confirm the action.\
\
This removes all messages while retaining the topic configuration.
10. To Migrate Topic\
\
Step 1 - Select one or more topics.\
Step 2 - Click Migrate Topics from One Kafka Cluster to Another.\
Step 3 - Select the destination cluster.\
Step 4 - Start the migration.\
Step 5 - Monitor the migration status until completion.