[improve][broker] Add an option to return 0 when querying partitions of a nonexistent topic #10
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…of a nonexistent topic ### Motivation apache#10601 (comment) apache#10601 changes the behavior when querying partitions of a topic that is not created. Before apache#10601, 0 is returned. After apache#10601, an exception will be thrown to indicate the topic does not exist. It leads to the incompatibility with some old Pulsar clients that do not add the "checkAllowAutoCreation=true" query param. If they use HTTP service URL like "http://localhost:8080", when accessing a topic that does not exist, the client will fail. The affected Pulsar clients include Java client <= 2.4.2 and C++/Python client <= 2.8.0. ### Modifications Add an option `checkTopicExistsWhenQueryPartitions` (default: true) to determine the behavior. Disable this option to keep the original behavior that 0 will be returned when querying partitions of a nonexistent topic.
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Motivation
apache#10601 (comment)
apache#10601 changes the behavior when querying partitions of a topic that is not created. Before apache#10601, 0 is returned. After apache#10601, an exception will be thrown to indicate the topic does not exist. It leads to the incompatibility with some old Pulsar clients that do not add the "checkAllowAutoCreation=true" query param. If they use HTTP service URL like "http://localhost:8080", when accessing a topic that does not exist, the client will fail.
The affected Pulsar clients include Java client <= 2.4.2 and C++/Python client <= 2.8.0.
Modifications
Add an option
checkTopicExistsWhenQueryPartitions(default: true) to determine the behavior. Disable this option to keep the original behavior that 0 will be returned when querying partitions of a nonexistent topic.