rdhabalia opened a new pull request, #23345:
URL: https://github.com/apache/pulsar/pull/23345
### Motivation
Currently, Pulsar-client lib doesn't increase the permits for the
failover/exclusive consumer if it has listener and if that consumer has to
filter out the messages because of incorrect epoch time. Because of that
message listener will eventually stop consuming messages as you can see below
that consumer doesn't have availablePermit and broker stops dispatching the
messages, even if consumer has processed all sent messages by the broker.
```
stats
subscriptions" : {
"activeConsumerName" : "f8051",
:
"consumers" : [ {
"msgRateOut" : 0.0,
"msgThroughputOut" : 0.0,
"bytesOutCounter" : 3623009,
"msgOutCounter" : 6752,
"msgRateRedeliver" : 0.0,
"messageAckRate" : 0.0,
"chunkedMessageRate" : 0.0,
"consumerName" : "f8051",
"availablePermits" : -2,
stats-internal
cursors" : {
"my-failover-sub" : {
"markDeletePosition" : "4748166582:37897",
"readPosition" : "4748166582:37898",
18:52:18.473 [pulsar-client-internal-1003-1] WARN
org.apache.pulsar.client.impl.ConsumerBase - Consumer filter old epoch message,
topic : [persistent://myProp/ns1/t1], messageId : [4748166582:37897:23],
messageConsumerEpoch : [4], consumerEpoch : [5] yrid:
18:52:18.476 [pulsar-client-internal-1003-1] DEBUG
org.apache.pulsar.client.impl.MultiTopicsConsumerImpl -
[persistent://myProp/ns1/t1][my-failover-sub] Received message from
topics-consumer 4748166582:37897:23
18:52:18.823 [pulsar-external-listener-863-1] DEBUG
org.apache.pulsar.client.impl.ConsumerBase -
[persistent://myProp/ns1/t1][my-failover-sub] Calling message listener for
message 4748166582:37897:23
```
### Modifications
Pulsar consumer should increase permits if it discard messages due to epoch
mismatch and continue processing messages with correct epoch.
### Verifying this change
- [ ] Make sure that the change passes the CI checks.
*(Please pick either of the following options)*
This change is a trivial rework / code cleanup without any test coverage.
*(or)*
This change is already covered by existing tests, such as *(please describe
tests)*.
*(or)*
This change added tests and can be verified as follows:
*(example:)*
- *Added integration tests for end-to-end deployment with large payloads
(10MB)*
- *Extended integration test for recovery after broker failure*
### Does this pull request potentially affect one of the following parts:
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*If the box was checked, please highlight the changes*
- [ ] Dependencies (add or upgrade a dependency)
- [ ] The public API
- [ ] The schema
- [ ] The default values of configurations
- [ ] The threading model
- [ ] The binary protocol
- [ ] The REST endpoints
- [ ] The admin CLI options
- [ ] The metrics
- [ ] Anything that affects deployment
### Documentation
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- [ ] `doc-required` <!-- Your PR changes impact docs and you will update
later -->
- [ ] `doc-not-needed` <!-- Your PR changes do not impact docs -->
- [ ] `doc-complete` <!-- Docs have been already added -->
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