Vikas Singh created KAFKA-13517:
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Summary: Add ConfigurationKeys to ConfigResource class
Key: KAFKA-13517
URL: https://issues.apache.org/jira/browse/KAFKA-13517
Project: Kafka
Issue Type: Improvement
Components: clients
Affects Versions: 3.0.0, 2.8.1
Reporter: Vikas Singh
Assignee: Vikas Singh
Fix For: 2.8.1
A list of {{ConfigResource}} class is passed as argument to
{{AdminClient::describeConfigs}} api to indicate configuration of the entities
to fetch. The {{ConfigResource}} class is made up of two fields, name and type
of entity. Kafka returns *all* configurations for the entities provided to the
admin client api.
This admin api in turn uses {{DescribeConfigsRequest}} kafka api to get the
configuration for the entities in question. In addition to name and type of
entity whose configuration to get, Kafka {{DescribeConfigsResource}} structure
also lets users provide {{ConfigurationKeys}} list, which allows users to fetch
only the configurations that are needed.
However, this field isn't exposed in the {{ConfigResource}} class that is used
by AdminClient, so users of AdminClient have no way to ask for specific
configuration. The API always returns *all* configurations. Then the user of
the {{AdminClient::describeConfigs}} go over the returned list and filter out
the config keys that they are interested in.
This results in boilerplate code for all users of
{{AdminClient::describeConfigs}} api, in addition to being wasteful use of
resource. It becomes painful in large cluster case where to fetch one
configuration of all topics, we need to fetch all configuration of all topics,
which can be huge in size.
Creating this Jira to add same field (i.e. {{{}ConfigurationKeys{}}}) to the
{{ConfigResource}} structure to bring it to parity to
{{DescribeConfigsResource}} Kafka API structure. There should be no backward
compatibility issue as the field will be optional and will behave same way if
it is not specified (i.e. by passing null to backend kafka api)
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