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[Broker & Bookie] Configure Bookkeeper client & server backpressure by default

related: #14861 and https://github.com/apache/bookkeeper/pull/3139

[Broker & Bookie] Configure Bookkeeper client & server backpressure by default

Fixes for backpressure issues on bookkeeper side: https://github.com/apache/bookkeeper/pull/3321, https://github.com/apache/bookkeeper/pull/3323, https://github.com/apache/bookkeeper/pull/3324

[Broker & Bookie] Configure Bookkeeper client & server backpressure by default

Pulsar uses Bookkeeper protocol V2 by default because V3 uses GRPC and that is not "garbage free". With V2 protocol, there is less GC overhead. The backpressure feature in bookkeeper...

Broker OOM when the bookie is slowly to respond and AQ is smaller than WQ

@zymap This seems to be related to #10439 .

[docs] Clarify security vulnerability process and reporting

related to #14610 and #16962 (fix for #16919 which was caused by #14610 changes)

[docs] Clarify security vulnerability process and reporting

@tisonkun @Anonymitaet @dave2wave @michaeljmarshall please review

[docs] Clarify security vulnerability process and reporting

> I'm bothered that we have versioned docs about security policies and supported versions. It makes no sense. I would suggest a further PR removes all of these and instead...

[Bug] Brokers in a cluster become unhealthy collectively

Pulsar 2.7.0 is an outdated version that contains security vulnerabilities (Log4Shell, CVE-2021-22160, CVE-2021-41571). It's strongly recommended upgrading to a more recent version. In your case, it's first recommended to upgrade...

[Bug] Brokers in a cluster become unhealthy collectively

> Though do we have any bug fixes on broker stability from 2.7.0 to 2.7.4/5? Yes, there's a large number of improvements and fixes.

Possible race condition: ReaderTest.testReadMessageWithBatchingWithMessageInclusive:148 expected [true] but found [false]

I created a repro for an issue that is flaky, but fails in most cases. This happens on Pulsar 2.5.0, but not on Pulsar 2.4.2. . The description and repro...