Offsets Subcommand

Learn how to use the offsets subcommand of the srm-client command line tool.

SRM automatically translates consumer group offsets between clusters. This allows consumers to be migrated from one cluster to another without losing any progress. The offsets subcommand is used to export the translated offsets from target clusters.

Export translated cluster offsets with the following command:
srm-control offsets --source [SOURCE_CLUSTER] --target [TARGET_CLUSTER] --group [GROUP1] --export > out.csv

The output file of the tool is used with the kafka-consumer-groups tool to reset offsets. For detailed steps on cluster migration, see Migrating Consumer Groups Between Clusters.

Client Override Options

The offset subcommand supports client override options. Client override options allow users to temporarily specify or override configuration properties. These options also enable users to issue srm-control commands even if the SRM’s configuration file is not available on the host that the command is being issued from. While it is possible to specify a range of properties with the client override options, and they can prove to be a powerful tool in certain scenarios, Cloudera recommends that you use Cloudera Manager to manage client configuration options.

The following client override options are available:
  • --bootstrap-servers: Specifies the bootstraps servers.
  • --props: Specifies client configuration properties.

A simple example of using client override options is when you want to change the bootstrap server. This can be done in two ways.

You can specify the bootstrap server with the --bootstrap-servers option.
srm-control --bootstrap-servers localhost:9092 offsets --source [SOURCE_CLUSTER] --group [GROUP] --export > out.csv
Alternatively, you can use the --props option together with the bootstrap.servers Kafka property to define the bootstrap server.
srm-control --props bootstrap.servers=localhost:9092 offsets --source [SOURCE_CLUSTER] --group [GROUP] --export > out.csv