cuishuang created KAFKA-21041:
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Summary: ClientMetricsConfigs rejects match patterns whose regex
contains an equals sign
Key: KAFKA-21041
URL: https://issues.apache.org/jira/browse/KAFKA-21041
Project: Kafka
Issue Type: Bug
Affects Versions: 4.3.1
Reporter: cuishuang
ClientMetricsConfigs.parseMatchingPatterns currently splits client match
patterns using String.split("="), which splits on every equals sign.
The method Javadoc specifies that a client match pattern is split into two
parts at the first occurrence of '='.
For example:
client_id=foo=bar
should be parsed as:
parameter: client_id
regex: foo=bar
However, the current implementation produces three parts and throws
InvalidConfigurationException.
Expected behavior:
The first '=' separates the parameter name from the regular expression, and
additional '=' characters remain part of the regular expression.
Actual behavior:
Patterns whose regular expression contains '=' are rejected.
A fix using split("=", 2), together with a regression test, restores the
behavior described by the existing Javadoc.
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