Download and untar the Pulsar offloaders package, then copy the Pulsar offloaders as offloaders in the Pulsar directory. See Install tiered storage offloaders.
A bucket is a basic container that holds your data. Everything you store in GCS must be contained in a bucket. You can use a bucket to organize your data and control access to your data, but unlike directory and folder, you can not nest a bucket.
Namespace policy can be configured to offload data automatically once a threshold is reached. The threshold is based on the size of data that a topic has stored on a Pulsar cluster. Once the topic reaches the threshold, an offload operation is triggered automatically.
Threshold value
Action
0 | It triggers the offloading operation if the topic storage reaches its threshold.
= 0|It causes a broker to offload data as soon as possible.
< 0 |It disables automatic offloading operation.
Automatic offloading runs when a new segment is added to a topic log. If you set the threshold on a namespace, but few messages are being produced to the topic, offloader does not work until the current segment is full.
You can configure the threshold size using CLI tools, such as pulsar-admin.
The offload configurations in broker.conf and standalone.conf are used for the namespaces that do not have namespace level offload policies. Each namespace can have its own offload policy. If you want to set offload policy for each namespace, use the command pulsar-admin namespaces set-offload-policies options command.
For more information about the pulsar-admin namespaces set-offload-threshold options command, including flags, descriptions, default values, and shorthands, see Pulsar admin docs.
For individual topics, you can trigger GCS offloader manually using one of the following methods:
Use REST endpoint.
Use CLI tools (such as pulsar-admin).
To trigger the GCS via CLI tools, you need to specify the maximum amount of data (threshold) that should be retained on a Pulsar cluster for a topic. If the size of the topic data on the Pulsar cluster exceeds this threshold, segments from the topic are moved to GCS until the threshold is no longer exceeded. Older segments are moved first.
Offload triggered for persistent://my-tenant/my-namespace/topic1 for messages before 2:0:-1
tip
For more information about the pulsar-admin topics offload options command, including flags, descriptions, default values, and shorthands, see Pulsar admin docs.
This example checks the GCS offloader status using pulsar-admin with the command pulsar-admin topics offload-status options.
For more information about the pulsar-admin topics offload-status options command, including flags, descriptions, default values, and shorthands, see Pulsar admin docs.