[improve][broker] Add an option to return 0 when querying partitions of a nonexistent topic #18594
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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.
BewareMyPower
added
the
type/enhancement
BewareMyPower
requested review from
merlimat,
rdhabalia,
eolivelli,
315157973,
codelipenghui,
coderzc and
michaeljmarshall
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This PR also fixes the incompatibility issue of allowAutoTopicCreationType=partitioned
defaultNumPartitions=4Then producing a message to a topic named "my-topic", you can see the created topic is still non-partitioned. $ ./bin/pulsar-admin topics list public/default
"persistent://public/default/my-topic"However, with the standalone that includes this patch. checkTopicExistsWhenQueryPartitions=false
allowAutoTopicCreationType=partitioned
defaultNumPartitions=4The created topic is a partitioned topic: $ ./bin/pulsar-admin topics list public/default
"persistent://public/default/my-topic-partition-0"
"persistent://public/default/my-topic-partition-3"
"persistent://public/default/my-topic-partition-1"
"persistent://public/default/my-topic-partition-2" |
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@rdhabalia PTAL |
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The pr had no activity for 30 days, mark with Stale label. |
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Motivation
#10601 (comment)
#10601 changes the behavior when querying partitions of a topic that is not created. Before #10601, 0 is returned. After #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.Verifying this change
This change added
HttpPartitionMetadataLookupTestto show the behavior whencheckTopicExistsWhenQueryPartitionsis true or false.Documentation
docdoc-requireddoc-not-neededdoc-completeMatching PR in forked repository
PR in forked repository: BewareMyPower#10