Release 1.22.0-incubating

This is the fourth of Apache Pulsar since entering the ASF incubator.

Major changes in this release include:

Features

• [#896] PIP-7 Introduce Failure-domain and Anti-affinity-namespace group
• [#1031] Add optional key/value metadata to producers/consumers
• [#1129] Added end to end encryption in C++ client
• [#1151] Added REST handler to create a subscription on a topic
• [#1087] Add basic authentication plugin
• [#1200] Add pluggable authorization mechanism
• [#1208] Add hostname-verification at client tls connection
• [#950] Provided an DCOS Universe package for pulsar
• [#1046] Introduce config to skip non-recoverable data-ledger
• [#899] Add subscription auth mode by prefix
• [#1135] Added infinite time retention configuration option

Enhancements

• [#1094] Include BoringSSL native implementation for faster TLS
• [#1204] Reduce size of buffer used to assemble batches
• [#930] Perform async DNS resolution
• [#1124] Support Pulsar proxy from C++/Python client library
• [#1012] Made load shedding for load manager Dynamically configurable
• [#962] Raw Reader for Pulsar Topics
• [#941] Upgraded Jackson version
• [#1002, #1169, #1168] Making Pulsar Proxy more secure
• [#1029] Fix MessageRouter hash inconsistent on C++/Java clien

Fixes

• [#1153] Fixed increase partitions on a partitioned topic
• [#1195] Ensure the checksum is not stripped after validation in the broker
• [#1203] Use duplicates when writing from ByteBuf pair to avoid multiple threads issues
• [#1210] Cancel keep-alive timer task after the proxy switch to TCP proxy
• [#1170] Upgrade BK version: BK-4.3.1.91-yahoo (fix: stats + DoubleByteBuf)
• [#875] Bug fixes for Websocket proxy

The complete list of changes can be found at:
https://github.com/apache/incubator-pulsar/milestone/11?closed=1