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创建和管理 Subscription

This tutorial guides you on how to create and manage subscriptions in HStream Platform.

Preparation

  1. If you do not have an account, please apply for a trial first and log in. After logging in, click Subscriptions on the left sidebar to enter the subscriptions page.

  2. If you have already logged in, click Subscriptions on the left sidebar to enter the Subscriptions page.

  3. Click the New subscription button to create a subscription.

Create a subscription

After clicking the New subscription button, you will be directed to the New subscription page. You need to set some necessary properties for your stream and create it:

  1. Specify the Subscription ID. You can refer to Guidelines to name a resource to name a subscription.

  2. Select a stream as the source from the dropdown list.

  3. Fill in with the ACK timeout. The default value is 60. Unit is second.

  4. Fill in the number of max unacked records. The default value is 100.

  5. Click the Confirm button to create a subscription.

TIP

For more details about ACK timeout and max unacked records, please refer to Attributes of a Subscription.

WARNING

Currently, the number of ACK timeout and max unacked records are fixed for each subscription in HStream Platform. We will gradually adjust these attributes in the future.

View subscriptions

The Subscriptions page lists all the subscriptions in your account with a high-level overview. For each subscription, you can view the following information:

  • The subscription's ID.

  • The name of the stream source. You can click on the stream name to navigate the stream details page.

  • The ACK timeout of the subscription.

  • The Max unacked records of the subscription.

  • The Creation time of the subscription.

  • Actions, which is used to expand the operations of the subscription:

    • Metrics: View the metrics of the subscription.
    • Consumers: View the consumers of the subscription.
    • Delete: Delete the subscription.

To view a specific subscription, click the subscription's name. The details page of the subscription will be displayed.

View subscription details

The details page displays detailed information about a subscription:

  1. All the information in the subscriptions page.

  2. Different tabs are provided to view the related information of the subscription:

View subscription metrics

After clicking the Metrics tab, you can view the metrics of the subscription. The default duration is last 5 minutes. You can select different durations to control the time range of the metrics:

  • last 5 minutes
  • last 1 hour
  • last 3 hours
  • last 6 hours
  • last 12 hours
  • last 1 day
  • last 3 days
  • last 1 week

The metrics of the subscription include (with last 5 minutes as an example), from left to right:

  • The Outcoming bytes throughput chart shows the number of bytes sent by the subscription per second in the last 5 minutes.
  • The Outcoming records throughput chart shows the number of records sent by the subscription per second in the last 5 minutes.
  • The Acknowledgements throughput chart shows the number of acknowledgements received in the subscription per second in the last 5 minutes.
  • The Resent records chart shows the number of records resent in the subscription in the last 5 minutes.

View subscription consumers

After clicking the Consumers tab, you can view the consumers of the subscription.

For each consumer, you can view the following information:

  • The Name of the consumer.
  • The Type of the consumer.
  • The URI of the consumer.

View the consumption progress of the subscription

After clicking the Consumption progress tab, you can view the consumption progress of the subscription.

For each progress, you can view the following information:

  • The Shard ID of the progress.
  • The Last checkpoint of the progress.

Delete a Subscription

This section describes how to delete a subscription.

Delete a subscription on the Subscriptions page

  1. Go to the Subscriptions page.
  2. Click the Delete icon of the subscription you want to delete. A confirmation dialog will pop up.
  3. Confirm the deletion by clicking the Confirm button in the dialog.

Delete a subscription on Subscription Details page

  1. Go to the details page of the subscription you want to delete.
  2. Click the Delete button. A confirmation dialog will pop up.
  3. Confirm the deletion by clicking the Confirm button in the dialog.