Add release note for 2.6.3. (apache#9305)

site2/website/release-notes.md

@@ -1,6 +1,84 @@
 
 ## Apache Pulsar Release Notes
 
+### 2.6.3 &mdash; 2020-11-25 <a id=“2.6.3”></a>
+
+#### Broker
+
+- Update the BookKeeper to version 4.11.1 [#8604](https://github.com/apache/pulsar/pull/8604)
+- Use the correct configuration for the expiration time of the ZooKeeper cache [#8302](https://github.com/apache/pulsar/pull/8302)
+- Refresh ZooKeeper-data cache in background to avoid deadlock and blocking IO on the ZooKeeper thread [#8304](https://github.com/apache/pulsar/pull/8304)
+- Add `elapsedMs` in the creation of the ledger log [#8473](https://github.com/apache/pulsar/pull/8473)
+- Fix the race condition when calling `acknowledgementWasProcessed()` [#8499](https://github.com/apache/pulsar/pull/8499)
+- Fix the way to handle errors for client requests [#8518](https://github.com/apache/pulsar/pull/8518)
+- Expose consumer names after the mark delete position for the Key_Shared subscription [#8545](https://github.com/apache/pulsar/pull/8545)
+- Close topics that remain fenced forcefully [#8561](https://github.com/apache/pulsar/pull/8561)
+- Expose the last disconnected timestamp for producers and consumers [#8605](https://github.com/apache/pulsar/pull/8605)
+- Support the HAProxy proxy protocol for Pulsar broker and Pulsar Proxy [#8686](https://github.com/apache/pulsar/pull/8686)
+- Clear delayed messages when clearing the backlog [#8691](https://github.com/apache/pulsar/pull/8691)
+- Fix the Jclouds Azure credential error [#8693](https://github.com/apache/pulsar/pull/8693)
+- Improve environment configiguration handling [#8709](https://github.com/apache/pulsar/pull/8709)
+- Fix the issue with failing to get `lastMessageId` for an empty topic due to message retention [#8725](https://github.com/apache/pulsar/pull/8725)
+- Ensure that the Offload manager is initialized once [#8739](https://github.com/apache/pulsar/pull/8739)
+- Fix the issue with getting partition metadata for a non-existed topic [#8818](https://github.com/apache/pulsar/pull/8818)
+- Fix the exception cast error [#8828](https://github.com/apache/pulsar/pull/8828)
+- Export Prometheus metric for messageTTL [#8871](https://github.com/apache/pulsar/pull/8871)
+- Fix the issue that GenericJsonReader converts the null value to string "null" [#8883](https://github.com/apache/pulsar/pull/8883)
+- Capture stats with precise backlog [#8928](https://github.com/apache/pulsar/pull/8928)
+- Monitor if a cursor moves its mark-delete position [#8930](https://github.com/apache/pulsar/pull/8930)
+- Intercept `beforeSendMessage` calls [#8932](https://github.com/apache/pulsar/pull/8932)
+- Expose non-contiguous deleted messages ranges stats [#8936](https://github.com/apache/pulsar/pull/8936)
+- Fix NPE in `PersistentStickyKeyDispatcherMultipleConsumers` [#8969](https://github.com/apache/pulsar/pull/8969)
+- Fix the issue that an exception is thrown when peeking at compressed messages (Readonly buffers are not supported by Airlift) [#8990](https://github.com/apache/pulsar/pull/8990)
+- Remove the duplicated broker Prometheus metrics type [#8995](https://github.com/apache/pulsar/pull/8995)
+- Improve the way to handle errors when the broker does not trust client certificates [#8998](https://github.com/apache/pulsar/pull/8998)
+- Add the raw Prometheus metrics provider [#9021](https://github.com/apache/pulsar/pull/9021)
+- Support chained authentication with same authentication method name [#9094](https://github.com/apache/pulsar/pull/9094)
+- Fix regression in apply-config-from-env.py [#9097](https://github.com/apache/pulsar/pull/9097)
+
+#### Proxy
+
+- Fix the `request.getContentLength()` to return 0 if it is less than 0 [#8448](https://github.com/apache/pulsar/pull/8448)
+- Add the error log for the Pulsar Proxy starter [#8451](https://github.com/apache/pulsar/pull/8451)
+- Support enabling WebSocket on Pulsar Proxy [#8613](https://github.com/apache/pulsar/pull/8613)
+- Fix the issue that the Proxy `bindAddress` configuration does not work for the `servicePort` [#9068](https://github.com/apache/pulsar/pull/9068)
+
+#### Java Client
+
+- Fix the connection leak [#6524](https://github.com/apache/pulsar/pull/6524)
+- Cancel the sendtimeout task for the producer after creation failure [#8497](https://github.com/apache/pulsar/pull/8497)
+- Fix the typo in `pulsar-client-all` module's pom.xml file [#8543](https://github.com/apache/pulsar/pull/8543)
+- Add more information in send timeout exception [#8931](https://github.com/apache/pulsar/pull/8931)
+- Fix the unavailable hash range condition [#9041](https://github.com/apache/pulsar/pull/9041)
+- Fix NPE when `MultiTopicsConsumerImpl` receives null-value messages [#9113](https://github.com/apache/pulsar/pull/9113)
+- Fix the issue with the incoming message size that is introduced by issue #9113 [#9182](https://github.com/apache/pulsar/pull/9182)
+
+#### C++ Client
+
+- Catch the exception thrown by the remote_endpoint [#8486](https://github.com/apache/pulsar/pull/8486)
+- Fix the potential crash caused by the AckGroupTracker's timer [#8519](https://github.com/apache/pulsar/pull/8519)
+- Fix the race condition in `BlockingQueue` [#8765](https://github.com/apache/pulsar/pull/8765)
+- Add the reader internal subscription name setter [#8823](https://github.com/apache/pulsar/pull/8823)
+- Add consumer's configurations for the reader [#8905](https://github.com/apache/pulsar/pull/8905)
+
+#### Python Client
+
+- Add Oauth2 client wrapper for the python client [#7813](https://github.com/apache/pulsar/pull/7813)
+
+#### Pulsar Perf
+
+- Support WebSocket Producer for V2 topics [#8535](https://github.com/apache/pulsar/pull/8535)
+
+#### Pulsar IO
+
+- Make Schema information of Source topic available to downstream Sinks [#8854](https://github.com/apache/pulsar/pull/8854)
+- Fix the error log of the Debezium connector [#9063](https://github.com/apache/pulsar/pull/9063)
+
+#### Functions
+
+- Propagate user-defined parameter into instances of Golang Pulsar Functions [#8132](https://github.com/apache/pulsar/pull/8132)
+- Go functions supports Kubernetes runtime [#8352](https://github.com/apache/pulsar/pull/8352)
+
 ### 2.7.0 &mdash; 2020-11-25 <a id=“2.7.0”></a>
 
 The following lists fixes and enhancements in the 2.7.0 release.