Release Notes - ZooKeeper - Version 3.9.0

Sub-task

• ZOOKEEPER-4327 - Flaky test: RequestThrottlerTest

Bug

• ZOOKEEPER-2108 - Compilation error in ZkAdaptor.cc with GCC 4.7 or later
• ZOOKEEPER-3652 - Improper synchronization in ClientCnxn
• ZOOKEEPER-3908 - zktreeutil multiple issues
• ZOOKEEPER-3996 - Flaky test: ReadOnlyModeTest.testConnectionEvents
• ZOOKEEPER-4026 - CREATE2 requests embeded in a MULTI request only get a regular CREATE response
• ZOOKEEPER-4296 - NullPointerException when ClientCnxnSocketNetty is closed without being opened
• ZOOKEEPER-4308 - Flaky test: EagerACLFilterTest.testSetDataFail
• ZOOKEEPER-4393 - Problem to connect to zookeeper in FIPS mode
• ZOOKEEPER-4466 - Support different watch modes on same path
• ZOOKEEPER-4471 - Remove WatcherType.Children break persistent watcher's child events
• ZOOKEEPER-4473 - zooInspector create root node fail with path validate
• ZOOKEEPER-4475 - Persistent recursive watcher got NodeChildrenChanged event
• ZOOKEEPER-4477 - Single Kerberos ticket renewal failure can prevent all future renewals since Java 9
• ZOOKEEPER-4504 - ZKUtil#deleteRecursive causing deadlock in HDFS HA functionality
• ZOOKEEPER-4505 - CVE-2020-36518 - Upgrade jackson databind to 2.13.2.1
• ZOOKEEPER-4511 - Flaky test: FileTxnSnapLogMetricsTest.testFileTxnSnapLogMetrics
• ZOOKEEPER-4514 - ClientCnxnSocketNetty throwing NPE
• ZOOKEEPER-4515 - ZK Cli quit command always logs error
• ZOOKEEPER-4537 - Race between SyncThread and CommitProcessor thread
• ZOOKEEPER-4549 - ProviderRegistry may be repeatedly initialized
• ZOOKEEPER-4565 - Config watch path get truncated abnormally and fail chroot zookeeper client
• ZOOKEEPER-4647 - Tests don't pass on JDK20 because we try to mock InetAddress
• ZOOKEEPER-4654 - Fix C client test compilation error in Util.cc.
• ZOOKEEPER-4674 - C client tests don't pass on CI
• ZOOKEEPER-4719 - Use bouncycastle jdk18on instead of jdk15on
• ZOOKEEPER-4721 - Upgrade OWASP Dependency Check to 8.3.1

New Feature

• ZOOKEEPER-4570 - Admin server API for taking snapshot and stream out the data
• ZOOKEEPER-4655 - Communicate the Zxid that triggered a WatchEvent to fire

Improvement

• ZOOKEEPER-3731 - Disable HTTP TRACE Method
• ZOOKEEPER-3806 - TLS - dynamic loading for client trust/key store
• ZOOKEEPER-3860 - Avoid reverse DNS lookup for hostname verification when hostnames are provided in the connection url
• ZOOKEEPER-4289 - Reduce the performance impact of Prometheus metrics
• ZOOKEEPER-4303 - ZooKeeperServerEmbedded could auto-assign and expose ports
• ZOOKEEPER-4464 - zooinspector display "Ephemeral Owner" in hex for easy match to jmx session
• ZOOKEEPER-4467 - Missing op code (addWatch) in Request.op2String
• ZOOKEEPER-4472 - Support persistent watchers removing individually
• ZOOKEEPER-4474 - ZooDefs.opNames is unused
• ZOOKEEPER-4490 - Publish Clover results to SonarQube
• ZOOKEEPER-4491 - Adding SSL support to Zktreeutil
• ZOOKEEPER-4492 - Merge readOnly field into ConnectRequest and Response
• ZOOKEEPER-4494 - Fix error message format
• ZOOKEEPER-4518 - remove useless log in the PrepRequestProcessor#pRequest method
• ZOOKEEPER-4519 - Testable interface should have a testableCloseSocket() method
• ZOOKEEPER-4529 - Upgrade netty to 4.1.76.Final
• ZOOKEEPER-4531 - Revert Netty TCNative change
• ZOOKEEPER-4551 - Do not log spammy stacktrace when a client closes its connection
• ZOOKEEPER-4566 - Create tool for recursive snapshot analysis
• ZOOKEEPER-4573 - Encapsulate request bytebuffer in Request
• ZOOKEEPER-4575 - ZooKeeperServer#processPacket take record instead of bytes
• ZOOKEEPER-4616 - Upgrade docker image for the dev enviroment to resolve CVEs
• ZOOKEEPER-4622 - Add Netty-TcNative OpenSSL Support
• ZOOKEEPER-4636 - Fix zkServer.sh for AIX
• ZOOKEEPER-4657 - Publish SBOM artifacts
• ZOOKEEPER-4659 - Upgrade Commons CLI to 1.5.0 due to OWASP failing on 1.4 CVE-2021-37533
• ZOOKEEPER-4660 - Suppress false positive OWASP failure for CVE-2021-37533
• ZOOKEEPER-4661 - Upgrade Jackson Databind to 2.13.4.2 for CVE-2022-42003 CVE-2022-42004
• ZOOKEEPER-4705 - Restrict GitHub merge button to allow squash commit only
• ZOOKEEPER-4717 - Cache serialize data in the request to avoid repeat serialize.
• ZOOKEEPER-4718 - Removing unnecessary heap memory allocation in serialization can help reduce GC pressure.

Test

• ZOOKEEPER-4630 - Fix the NPE from ConnectionMetricsTest.testRevalidateCount
• ZOOKEEPER-4676 - ReadOnlyModeTest doesn't not compile on JDK20 (Thread.suspend has been removed)

Wish

• ZOOKEEPER-3615 - write a TLA+ specification to verify Zab protocol
• ZOOKEEPER-4710 - Fix ZkUtil deleteInBatch() by releasing semaphore after set flag
• ZOOKEEPER-4714 - Improve syncRequestProcessor performance
• ZOOKEEPER-4715 - Verify file size and position in testGetCurrentLogSize.

Task

• ZOOKEEPER-4479 - Tests: C client test TestOperations.cc testTimeoutCausedByWatches1 is very flaky on CI
• ZOOKEEPER-4482 - Fix LICENSE FILES for commons-io and commons-cli
• ZOOKEEPER-4599 - Upgrade Jetty to avoid CVE-2022-2048
• ZOOKEEPER-4641 - GH CI fails with error: implicit declaration of function FIPS_mode
• ZOOKEEPER-4642 - Remove Travis CI
• ZOOKEEPER-4649 - Upgrade netty to 4.1.86 because of CVE-2022-41915
• ZOOKEEPER-4669 - Upgrade snappy-java to 1.1.9.1 (in order to support M1 macs)
• ZOOKEEPER-4688 - Upgrade cyclonedx-maven-plugin to 2.7.6
• ZOOKEEPER-4700 - Update Jetty for fixing CVE-2023-26048 and CVE-2023-26049
• ZOOKEEPER-4707 - Update snappy-java to address multiple CVEs
• ZOOKEEPER-4709 - Upgrade Netty to 4.1.94.Final
• ZOOKEEPER-4716 - Upgrade jackson to 2.15.2, suppress two false positive CVE errors