Apache Pulsar 2.5.0

[PIP-41] Introduce Protocol Handler API #5130 #5743
[PIP-45] Pluggable metadata interface #5330
[PIP-44] Separate schema compatibility checker for producer and consumer #5227
[PIP-43] Producer send messages with different schema #5141 #5517
[PIP-51] Introduce sticky consumer #5388
[PIP-38] Support batch receive in java client. #4621
[PIP-52] PIP-52: [pulsar-sever] Add support of dispatch throttling relative to publish-rate #5797

[Broker] Avoid retrying deleting namespace when topic is already deleted/fenced #4665
[Broker] Fix expiry monitor to continue on non-recoverable error #4818
[Broker] fix ns-isolation api to fetch policy for specific broker #5314
[Broker] external protocols not set to local broker data #5749
[Broker] Add handle exception KeeperException.BadVersionException #5563
[Broker] Fix message deduplicate issue while using external sequence id with batch produce #5491
[Broker] Remove cursor while remove non-durable subscription #5719
[Broker] Fix potential read 0 entries cause dispatcher stop dispatch #5894
[Proxy] Proxy doesn't use the right ca certicate to connect to brokers #5971
[Client] Add SentConnectFrame state check when running handleError #5913

[Zookeeper] Bump zookeeper to version 3.5.6 #5043
[BookKeeper] Upgrade bk version to 4.10.0 #5607
[Broker] Process requests asynchronously on some REST APIs 4765 4778 4795
[Broker] Fixes not owned bundles got selected when broker overloading #5002
[Broker] Support update partition for global topic #5306
[Broker] Ensure the handling of PartitionMetadataRequest is async end-to-end #5307
[Broker] Allow to automatically assign TCP ports when starting a broker #3555
[Broker] Introduce publish rate-limiting on topic #3986
[Broker] Add publish rate limit for each broker to avoid OOM #5710
[Broker] Allow for namespace default of offload threshold #5872
[Broker] Avoid unsafe split when validate hostname which might be ipv6 address #5713
[Broker] Support batch authorization of partitioned topic #5767
[Client][Java] Introduce batchingMaxBytes setting in pulsar producer #5045
[Client][Java] Add epoch for connection handler to handle create producer timeout #5571
[Performance] Reduce char[] creation on jvm heap #5055
[CLI] Add a broker tool for operations of a specific broker #5768
[CLI] Validate topic name before creating partition/non partition topic via admin cli #5148
[CLI] Make PulsarClusterMetadataSetup idempotent #5879
[CLI] Allow for topic deletions with regex consumers #5230

[Broker] Added delayed messages in Prometheus when using namespace-level metrics aggregation #4691
[Dashboard] Increasing Dashboard consumerName field to 256 varchar 4716
[Dashboard] integrate peek into messages page #4966
[Dashboard] Support parse batch entry #4992

[Broker] Pulsar schema api should respect to namespace level compatibility #4821
[Client][Java] NPE is thrown when a consumer consumes a partitioned topic with struct schema #4960
[Broker] Add compatibility check for primitive schema types #5051
[Broker] Support uploading key/value schema using Pulsar admin #5000
[Client][Java] Schema support encoding & encoding ByteBuf #5123

[Function Worker] Allow resource overcommitting when running functions in Kubernetes 4829
[Function Worker] Make Function Authentication Provider pluggable #5404
[Function Worker] Added deletion of state for Functions #5469
[Function Worker] Distribute the CA for KubernetesSecretsTokenAuthProvider #5398
[Function Runtime] Function runtime pluggable #5463
[Function Runtime] Allow functions to pass runtime specific options #5400

Support for other schema name separators in pulsar SQL 4732
Reuse ManagedLedgerFactory instances across SQL queries 4813
Using pulsar SQL query messages will appear NoSuchLedger when zk root directory changed #5001

The development of Pulsar Transaction is still ongoing

[Buffer] Add new marker to show which message belongs to transaction #4776
[Buffer] Add data ledger position in txn commit marker #4826
[Buffer] Add basic operation of transaction #4738
[Buffer] Add new commands for the transaction #4866
[Protocol] Add default handler to handle transaction related commands #4891
[Client] Introduce Transaction Client API #4952
[Client] Add transaction coordinator client #4953
[Broker] Ownership change listeners #5457
[Coordinator] Bootstrap pulsar system namespace and create TC assign topic #5515
[Coordinator] Add transaction metadata store service #5504