Chia-Ping Tsai created KAFKA-18735:
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Summary: the zk-related path `<default>` is still existent in
quota system, such as `ConfigEntity#name` and metrics tags
Key: KAFKA-18735
URL: https://issues.apache.org/jira/browse/KAFKA-18735
Project: Kafka
Issue Type: Improvement
Reporter: Chia-Ping Tsai
Assignee: Chia-Ping Tsai
the `<default>` is a specific "flag" used by zk path to represent the "default"
quota. We don't expose it on Admin as we use `null` to represent the default
name [0], and in KAFKA-16411 we assumes `<default>` should be removed from 4.0
with the end of ZK mode [1]
However, the `<default>` is still used in two "public APIs"
1. ConfigEntity#name return <default> for default quotas. The docs say it
return empty string, but that is incorrect. see [2]
2. "client-id" -> "<default>" and "user" -> "<default>" are used in metrics
tag [3]
[0]
https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/common/quota/ClientQuotaEntity.java#L44
[1]
https://github.com/apache/kafka/blob/trunk/server-common/src/main/java/org/apache/kafka/server/config/ZooKeeperInternals.java#L24
[2]
https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/server/ClientQuotaManager.scala#L79
[3]
https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/server/ClientQuotaManager.scala#L479
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