kfaraz opened a new issue, #20416:
URL: https://github.com/apache/druid/issues/20416

   ---
   id: release-notes
   title: "Release notes"
   ---
   
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   <!--Replace {{DRUIDVERSION}} with the correct Druid version.-->
   
   Apache Druid 38.0.0 contains over $NUMBER_FEATURES new features, bug fixes, 
performance enhancements, documentation improvements, and additional test 
coverage from $NUMBER_OF_CONTRIBUTORS contributors.
   
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   See the [complete set of 
changes](https://github.com/apache/druid/milestone/68?closed=1) for additional 
details, including bug fixes.
   
   Review the [upgrade notes](#upgrade-notes) and [incompatible 
changes](#incompatible-changes) before you upgrade to Druid \{\{DRUIDVERSION}}.
   If you are upgrading across multiple versions, see the [Upgrade 
notes](upgrade-notes.md) page, which lists upgrade notes for the most recent 
Druid versions.
   
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   - Functional area and related changes
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   ## Important features, changes, and deprecations
   
   This section contains important information about new and existing features.
   
   #### Java
   
   Druid now supports Java 25. While Java 21 is still supported, we recommend 
you upgrade to Java 25.
   
   Support for Java 17 has been dropped.
   
   [#19304](https://github.com/apache/druid/pull/19304) 
[#19336](https://github.com/apache/druid/pull/19336)
   
   #### Historical tier aliases
   
   You can map a virtual tier name to a number of real Historical tiers with 
the `historicalTierAliases` Coordinator dynamic configuration. This creates a 
single identifier for a group of Historical tiers. When a load/drop rule 
references the alias, the Coordinator replaces it with the actual tiers. For 
example, if you map the Historical tiers `hot_1` and `hot_2` to the alias 
`hot`, the rule `{"hot": 2}` loads 2 replicas of each onto `hot_1` and `hot_2`.
   
   [#19204](https://github.com/apache/druid/pull/19204) 
[#19667](https://github.com/apache/druid/pull/19667)
   
   #### New load rule types
   
   Adds a new family of retention rules, `loadPartialByPeriod`, 
`loadPartialByInterval`, `loadPartialForever`, laying the groundwork for 
partial loading of version 10 segment projections on Historicals. 
   
   [#19374](https://github.com/apache/druid/pull/19374)
   
   #### Realtime segments mode query context
   
   The `realtimeSegmentsOnly` query context parameter has been deprecated and 
replaced with `realtimeSegmentsMode`. 
   
   You can set `realtimeSegmentsMode` to one of the following:
   
   - `include` (default): query all segments, including realtime segments
   - `exclude`: skip realtime segments for the query
   - `exclusive`: query only realtime segments 
   
   This is useful when performing things like blue/green deployments and you 
only want to query new Historical replica autoscaling groups and not touch any 
"live" nodes (neither realtime nor historical).
   
   [#19486](https://github.com/apache/druid/pull/19486)
   
   #### Faster segment metadata search
   
   You can set `druid.segment.timeline.fastIntervalSearch` to `true` so that 
Druid uses an index based on interval trees to store that metadata in memory 
for faster identification and retrieval.
   
   This feature is off by default.
   
   [#19138](https://github.com/apache/druid/issues/19138) 
[#19850](https://github.com/apache/druid/issues/19850)
   
   #### Fetching files in the background
   
   The MSQ task engine now supports workers fetching input files from cloud 
storage asynchronously. This overlaps downloading with processing, which 
generally improves throughput when reading larger numbers of files. Otherwise, 
workers stream each file directly from cloud storage while processing it.
   
   This feature is on by default and is controlled by the 
`backgroundFetchExternalFiles` setting.
   
   [#19539](https://github.com/apache/druid/pull/19539)
   
   #### Segment prefetching for Dart
   
   Dart now supports the runtime property 
`druid.msq.dart.worker.segmentLoadAheadCount`, which controls the number of 
segments that Dart prefetches. If set greater than 0 for a worker, this setting 
becomes the default `segmentLoadAheadCount` value for the worker. If a query 
includes the `segmentLoadAheadCount` query context parameter, the query context 
takes precedence.
   
   [#19559](https://github.com/apache/druid/pull/19559)
   
   #### Partial segment loading
   
   [#19620](https://github.com/apache/druid/pull/19620)
   [#19535](https://github.com/apache/druid/pull/19535)
   
   #### Clustered segments
   
   [#19579](https://github.com/apache/druid/pull/19579)
   [#19597](https://github.com/apache/druid/pull/19597) 
[#19460](https://github.com/apache/druid/pull/19460)
   
   #### Improved Convert to SQL in web console
   
   The web console now supports converting streaming supervisors to SQL-based 
ingestion queries. This makes it easier for you to run a streaming task as a 
one-time batch ingestion.
   
   Select the **Convert supervisor to SQL** option from the **...** menu in the 
Query view. You can select from existing supervisors or provide JSON for a new 
one.
   
   [#19547](https://github.com/apache/druid/pull/19547)
   
   ## Functional area and related changes
   
   This section contains detailed release notes separated by areas.
   
   ### Web console
   
   #### Other web console improvements
   
   - Added the following status details to the **Services** view for Historical 
services: cloning from another Historical, in turbo loading mode, in 
decommissioning mode [#19253](https://github.com/apache/druid/pull/19253)
   - Added support for resetting a supervisor to the latest offsets and 
backfilling [#19533](https://github.com/apache/druid/pull/19533)
   - Improved handling for new tabs 
[#19483](https://github.com/apache/druid/pull/19483)
   - Improved the Home view's **Services** card. It now reports Overlord, 
Coordinator, Router, Broker, and Indexer counts on clusters where the web 
console talks to the Coordinator without SQL access 
[#19481](https://github.com/apache/druid/pull/19481)  
   
   ### Ingestion
   
   * You can now use the expression aggregator at ingestion time for 
expressions that produce a LONG or DOUBLE for both fold and combine expressions 
[#19508](https://github.com/apache/druid/pull/19508)
   * Added `now()` expression function that returns the current system 
timestamp in milliseconds since epoch. Useful at ingestion time for 
troubleshooting pipeline delays (e.g., `now() - __time`). Note: `now()` is 
non-deterministic as it evaluates for every row, so it can break idempotency. 
This can be added to any column besides `__time` 
[#19386](https://github.com/apache/druid/pull/19386)
   * Improved resiliency when ingesting from S3. Druid now retries on 
`SSLException` and transient credential errors instead of failing 
[#19617](https://github.com/apache/druid/pull/19617) 
[#19558](https://github.com/apache/druid/pull/19558)
   * Improved S3 performance 
[#19394](https://github.com/apache/druid/pull/19394)
   * Updated the default S3 connection pool size so that it's computed based on 
the number of available processors 
[#19536](https://github.com/apache/druid/pull/19536)
   
   #### SQL-based ingestion
   
   ##### EXTERN for S3 now supports role ARN
   
   You can now include the role ARN when running an INSERT INTO EXTERN query. 
For example:
   
   ```
   INSERT INTO
   EXTERN(
     s3(bucket => 'test2', prefix => 'export', assumeRoleArn => 
'arn:aws:iam::00000:role/test-20260520'))
   AS CSV
   SELECT ...
   ```
   
   [#19317](https://github.com/apache/druid/pull/19317)
   
   ##### Other SQL-based ingestion improvements
   
   - Added storage counters for the amount of bytes and files written to local 
and durable storage as well as the state of the local `ByteTracker`. Per-worker 
storage counters have also been added to the web console 
[#19316](https://github.com/apache/druid/pull/19316)
   
   #### Streaming ingestion
   
   ##### Scaling cool down
   
   You can now configure different cool down durations for scaling up and 
scaling down streaming task autoscalers.
   
   [#19286](https://github.com/apache/druid/pull/19286)
   
   ##### Improved supervisor restarts
   
   Supervisors no longer restart for all changes. Based on the type of change, 
one of the following can occur:
   
   - Druid persists the updated spec without a restart.
   - Druid restarts the supervisor, but running tasks aren't impacted.
   - Druid restarts the supervisor is restarted and its tasks are terminated, 
which was the default behavior before this change.
   
   For example, cosmetic changes to a supervisor spec no longer trigger a 
restart.
   
   [#19700](https://github.com/apache/druid/pull/19700) 
[#19720](https://github.com/apache/druid/pull/19720)
   
   Additionally, the algorithm for determining a change in the spec has been 
improved. For example, changes to `ioConfig.taskCount` don't trigger a 
supervisor restart if auto-scaling is enabled.
   
   [#19541](https://github.com/apache/druid/pull/19541)
   
   ###### Latest offset and backfill
   
   For Kafka and RabbitMQ, you can now reset a supervisor to the latest offset 
and start a new bounded backfill supervisor to ingest data from the skipped 
range. This is a useful feature for operating Druid clusters where the most 
recent data is the most important, like alerting scenarios.
   
   Note the following requirements:
   
   - The supervisor's `useEarliestSequenceNumber` property must be `false`.
   - The supervisor context must have `useConcurrentLocks` set to `true` to 
allow the backfill supervisor's tasks to write concurrently with the main 
supervisor's tasks.
   - The supervisor must be in a `RUNNING` state.
   
   Use `POST` 
`/druid/indexer/v1/supervisor/{supervisorId}/resetToLatestAndBackfill` or the 
web console to perform this action.
   
   [#19477](https://github.com/apache/druid/pull/19477)
   
   ##### Prunable shard specs for streaming published segments
   
   Kafka ingestion can now publish segments that the Broker prunes at query 
time without waiting for compaction. Set 
`tuningConfig.streamingPartitionsSpec.partitionDimensions` to a list of 
low-to-medium cardinality dimensions; each task records
   the distinct values it observes per dimension and stamps them onto a new 
`dim_value_set` shard spec. Queries that filter on a declared dimension then 
skip segments whose values can't match. 
   
   The feature is opt-in, Kafka-only, and disabled by
   default; when unset, behavior is unchanged.
   
   `dim_value_set` is a new core shard spec type with no fallback, so it is not 
forward-compatible. Upgrade all services before enabling 
`streamingPartitionsSpec`. Once `dim_value_set` segments are published, 
downgrade is unsupported
   until they are compacted away or `streamingPartitionsSpec` is removed.
   
   Added `maxValuesPerDimension` (optional) to `streamingPartitionsSpec`.
     
   [#19571](https://github.com/apache/druid/pull/19571) 
[#19596](https://github.com/apache/druid/pull/19596)
   
   ##### Other streaming ingestion improvements
   
   - Added a property called `boundedStreamConfig` to the 
`SeekableStreamSupervisorIOConfig`, which allows operators to spin up a 
Supervisor that consumes only a specified offset range 
[#19372](https://github.com/apache/druid/pull/19372)
   - Improved the cost-based autoscaler for better throughput 
[#19646](https://github.com/apache/druid/pull/19646)
   
   ### Querying
   
   #### New query laning strategy
   
   The `weighted` query laning strategy scores queries by how many thresholds 
they breach (segment count, interval duration, data age, segment range) and 
assigns them to configurable graduated lanes with different capacity limits, 
providing more nuanced lane assignment than the existing binary high/low 
strategy.
   
   The weighted query laning strategy supports optional per-threshold cost 
weights:
   
   - `periodWeight`
   - `durationWeight`
   - `segmentCountWeight`
   - `segmentRangeWeight`
   
   These threshold weights default to 1.
   
   [#19225](https://github.com/apache/druid/pull/19225) 
[#19665](https://github.com/apache/druid/pull/19665) 
[#19696](https://github.com/apache/druid/pull/19696)
   
   #### Other querying improvements
   
   - Added nullable `minTime/maxTime` Long fields to `ProjectionMetadata` 
[#19398](https://github.com/apache/druid/pull/19398)
   - Added `getDimensionRangeSet` support to `LikeDimFilter` for equality and 
prefix cases [#19524](https://github.com/apache/druid/pull/19524)
   - Added support for aggregate projections with clustered segments 
[#19599](https://github.com/apache/druid/pull/19599)
   - Optimized performance of aggregators for groupBy queries 
[#19423](https://github.com/apache/druid/pull/19423)
   
   ### Cluster management
   
   #### Improved `diskNormalized` balancer strategy
   
   The `diskNormalized` strategy is now more tunable.  The 
`utilizationThreshold` configuration works more intuitively: increasing the 
threshold increases the "tolerance" of the strategy while decreasing the 
threshold pushes nodes' disk utilization closer together.
   
   [#19663](https://github.com/apache/druid/pull/19663)
   
   #### MiddleManager and Indexer restarts
   
   MiddleManagers and Indexers now persist their enabled or disabled state 
across restarts. If you prefer the old behavior, where the server re-enables 
itself after a restart, set `druid.worker.startAlwaysEnabled = true`.
   
   [#19373](https://github.com/apache/druid/pull/19373)
   
   #### Kafka idle signal
   
   Improved the cost-based auto scaler for Kafka. The `poll-idle ratio` only 
reflected the time spent polling, whether there is spare processing capacity. 
You can now configure the autoscaler to use a utilization ratio instead: 
   
   ```
   1 - (avgProcessingRate / maxObservedRate)
   ```
   
   Set `useUtilizationRatio` to `true` to use this new ratio for autoscaling. 
   
   [#19622](https://github.com/apache/druid/pull/19622)
   
   
   #### Other cluster management improvements
   
   - Added `datasource` filter pushdown to `sys.segments` table 
[#19718](https://github.com/apache/druid/pull/19718) 
[#19731](https://github.com/apache/druid/pull/19731)
   - Added a `restarted` boolean field to the supervisor POST endpoint response 
to indicate whether the supervisor was actually restarted 
[#19349](https://github.com/apache/druid/pull/19349)
   - Added `error_message` column to `sys.server_properties` table and made the 
table resilient to unreachable servers. Previously, the entire query would fail 
if any server was unreachable; now a row is returned with `error_message` 
populated. The table also now supports filter and projection pushdown 
[#19459](https://github.com/apache/druid/pull/19459)
   - Added `druid.expressions.useVectorApi` config to support the incubating 
JDK Vector API. To use the API, set the config to `true` and start Druid with 
the `--add-modules=jdk.incubator.vector` flag 
[#19512](https://github.com/apache/druid/pull/19512)
   - Added debug logging at the INFO level for projections if the debug flag is 
set [#19613](https://github.com/apache/druid/pull/19613)
   - The MSQ task engine now logs the full stack trace when `debug` is set in 
the context [#19361](https://github.com/apache/druid/pull/19361)
   - Improved the cost-based autoscaler so that it scales down over-provisioned 
supervisors running above the ideal idle ratio with low lag 
[#19562](https://github.com/apache/druid/pull/19562)
   - Improved how Druid handles Java. MiddleManagers now honor `JAVA_HOME` 
[#19709](https://github.com/apache/druid/pull/19709)
   
   ### Data management
   
   #### Other data management improvements
   
   * Improved how compaction supervisor specs start up. They no longer attempt 
to create tasks with invalid configs 
[#19223](https://github.com/apache/druid/pull/19223)
   * Changed Historical tiers so that they can only be associated with one tier 
alias [#19595](https://github.com/apache/druid/pull/19595)
   * Sped up segment metadata cache syncs 
[#19672](https://github.com/apache/druid/pull/19672)
   
   ### Metrics and monitoring
   
   #### New metadata cache metrics
   
   Added the following metrics for the segment metadata cache:
   
   - `segment/metadataCache/unused/count`
   - `segment/metadataCache/fetchIds/time`
   - `segment/metadataCache/fetchPayloads/time`
   - `segment/metadataCache/fetchPending/time`
   - `segment/metadataCache/fetchSchemas/time`
   - `segment/metadataCache/fetchIndexingStates/time`
   - `segment/metadataCache/updateIds/time`
   - `segment/metadataCache/updateSnapshot/time`
   - `segment/metadataCache/schema/skipped`
   - `segment/metadataCache/indexingState/added`
   - `segment/metadataCache/indexingState/deleted`
   
   [#19672](https://github.com/apache/druid/pull/19672)
   
   #### Changed metrics for cost-based autoscaling
   
   Removed the following metrics:
   
   - `task/autoScaler/costBased/lagCost`
   - `task/autoScaler/costBased/idleCost`
   
   Added the following metrics:
   
   - `task/autoScaler/costBased/avgProcessingRate`
   - `task/autoScaler/costBased/avgPollIdleRatio`
   - `task/autoScaler/costBased/lagWeight`
   - `task/autoScaler/costBased/costWeight`
   
   [#19631](https://github.com/apache/druid/pull/19631)
   
   #### Auth metrics
   
   You can now configure Druid to emit metrics for authorization events.
   
   The `auth/forbidden` and `auth/exception` metrics have the following 
dimensions to support precise alerting on security events:
   
   - `identity`
   - `authorizerName`
   - `resourceName`
   - `resourceType`
   - `action`
   - `errorMessage` where applicable
   
   
   To enable this functionality, set `druid.auth.emitAuthMetrics` to `true`.
   
   [#19552](https://github.com/apache/druid/pull/19552)
   
   #### Storage metrics
   
   The `storage/load/bytes` and `storage/virtual/load/bytes` metrics now 
measure once the load is complete. Previously, they measured when the load 
starts.
   
   Additionally, `storage/load/begin/bytes` and 
`storage/virtual/load/begin/bytes` have been introduced and have the previous 
function of `storage/load/bytes` and `storage/virtual/load/bytes`.
   
   The `count` metrics have also been updated to reflect this.
   
   [#19451](https://github.com/apache/druid/pull/19451)
   
   #### Concurrent append and replace
   
   Added the following metrics for concurrent append and replace in realtime 
ingestion tasks:
   
   - `ingest/segmentUpgrade/count`
   - `ingest/segmentUpgrade/notified`
   - `ingest/segmentUpgrade/unmatched`
   - `ingest/segmentUpgrade/sendFailed`
   - `ingest/segmentUpgrade/announced`
   - `ingest/segmentUpgrade/skipped`
   
   [#19651](https://github.com/apache/druid/pull/19651)
   
   #### Other metrics and monitoring improvements
   
   * Added the metric `segment/allocated/count` to track IDs of allocated 
pending segments [#19674](https://github.com/apache/druid/pull/19674)
   * Added `remoteAddress` dimension for JDBC/Avatica queries to the following 
metrics: `sqlQuery/time`, `sqlQuery/bytes`, and `sqlQuery/planningTimeMs` 
[#19231](https://github.com/apache/druid/pull/19231)
   * Added `identity` dimension on `query/time` metric for the Router 
[#19342](https://github.com/apache/druid/pull/19342)
   * Added `kafka/consumer/pollIdleRatio`, which corresponds to the Kafka 
consumer `poll-idle-ratio-avg` 
[#19366](https://github.com/apache/druid/pull/19366)
   * Added `supervisorId` to Kafka consumer metrics 
[#19525](https://github.com/apache/druid/pull/19525)
   * Added `tierAlias` dimension to some tiered metrics, making it easier to 
aggregate across aliases for the monitoring and alerting 
[#19595](https://github.com/apache/druid/pull/19595)
   * Added the `query/segments/count` metric to data nodes 
[#19624](https://github.com/apache/druid/pull/19624)
   * Added the following metrics for virtual storage: 
`storage/virtual/read/count`,  `storage/virtual/read/bytes`, 
`storage/virtual/read/time ` 
[#19632](https://github.com/apache/druid/pull/19632)
   * Changed `query/node/{bytes/time}` and backpressure metrics to emit even on 
query failure to data nodes [#19453](https://github.com/apache/druid/pull/19453)
   * Improved metrics for partial segment loading 
[#19632](https://github.com/apache/druid/pull/19632)
   * Improved router logging to always include `statusCode` dimension 
[#19668](https://github.com/apache/druid/pull/19668)
   
   ### Extensions
   
   #### Redis
   
   You can now enable TLS support for Redis connections.
   
   [#19666](https://github.com/apache/druid/pull/19666)
   
   #### `pac4j` OIDC authentication
   
   Users of the `druid-pac4j` OIDC authentication extension can now explicitly 
configure their preferred client authentication method using the new optional 
`clientAuthenticationMethod` parameter. This resolves compatibility issues 
introduced with `pac4j` `5.7.3` where OIDC providers advertising 
`private_key_jwt` would cause authentication failures when the asymmetric JWT 
method was not configured.
   
   Supported values include: `client_secret_basic`, `client_secret_post`, 
`client_secret_jwt`, `private_key_jwt`, and `none`. If not specified, `pac4j` 
will continue to use its auto-detection behavior.
   
   [#19020](https://github.com/apache/druid/pull/19020)
   
   #### Kubernetes
   
   - Added `sys` metrics for k8s peons 
[#19305](https://github.com/apache/druid/pull/19305)
   - Added experimental support for running Kubernetes indexing tasks across 
multiple Kubernetes clusters. Set `druid.indexer.runner.type=multik8s` and 
configure `druid.indexer.runner.clusters` to schedule tasks across multiple 
Kubernetes clusters from a single Overlord 
[#19433](https://github.com/apache/druid/pull/19433)
   - `jvm.config` ConfigMaps are now honored by Peons 
[#19364](https://github.com/apache/druid/pull/19364)
   - You can now set `podTemplateSelectionKey` in a task's context to pick a 
specific configured pod template (e.g. 
`druid.indexer.runner.k8s.podTemplate.<selectionKey>`) without configuring a 
`selectorBased` strategy. The override takes precedence over both the default 
and `selectorBased` strategies. The feature is controlled by the new runtime 
property `druid.indexer.runner.allowTaskPodTemplateSelection`, which defaults 
to `false`. If the named template isn't configured, the task fails to launch. 
[#19419](https://github.com/apache/druid/pull/19419)
   
   #### T-digest sketch
   
   You can now pin the maximum available compression on T-digest operators to 
bind resources using the `druid.tdigest.maxCompression` parameter.
   
   [#19310](https://github.com/apache/druid/pull/19310)
   
   #### OpenLineage
   
   Added `extensions-contrib/openlineage-emitter` as a community extension. It 
uses the `RequestLogger` to transform and send lineage information to any 
OpenLineage-compatible API.
   
   [#19107](https://github.com/apache/druid/pull/19107)
   
   ## Upgrade notes and incompatible changes
   
   ### Upgrade notes
   
   #### Java
   
   Druid now supports Java 25. While Java 21 is still supported, we recommend 
you upgrade to Java 25.
   
   Support for Java 17 has been dropped.
   
   [#19304](https://github.com/apache/druid/pull/19304) 
[#19336](https://github.com/apache/druid/pull/19336)
   
   #### `JAVA_HOME`
   
   When Druid uses the bundled `bin/run-java` script during startup, it honors 
the `DRUID_JAVA_HOME`/`JAVA_HOME` environment variables. Otherwise, Druid falls 
back to `java` on the `PATH`.
   
   [#19709](https://github.com/apache/druid/pull/19709)
   
   #### ZooKeeper-based task runner
   
   The ZooKeeper-based `RemoteTaskRunner` (`druid.indexer.runner.type=remote`) 
has been removed. The HTTP-based `httpRemote` runner has been the default since 
Druid 25.0.0 and is now the only supported distributed task runner. `local` 
(in-process) remains supported for single-process testing, and the `k8s` runner 
from the Kubernetes extension is unaffected.
   
   If your configuration sets `druid.indexer.runner.type=remote`, startup 
fails. Remove the property or set it to `httpRemote` (which is the default) to 
proceed.
   
   The following configuration properties are no longer recognized and should 
be removed from `common.runtime.properties`:
   
   - `druid.indexer.runner.maxZnodeBytes`
   - `druid.indexer.runner.taskShutdownLinkTimeout`
   - `druid.indexer.runner.compressZnodes`
   - `druid.zk.paths.indexer.base`
   - `druid.zk.paths.indexer.announcementsPath`
   - `druid.zk.paths.indexer.tasksPath`
   - `druid.zk.paths.indexer.statusPath`
   
   ZooKeeper is still used for Coordinator/Overlord leader election and service 
(node) announcement and discovery.
   
   [#19500](https://github.com/apache/druid/pull/19500)
   
   #### ZooKeeper-based segment announcement and discovery removed
   
   The ZooKeeper-based segment announcement and inventory view, which have been 
deprecated and off by default for several releases, have been removed. The 
HTTP-based path (the default for `druid.serverview.type=http`) is now the only 
supported option.
   
   If your configuration sets `druid.serverview.type` to anything other than 
`http`, startup now fails with a clear error message. Remove the property (or 
set it to `http`, which is the default) to proceed.
   
   The following configuration properties are no longer recognized and should 
be removed from `common.runtime.properties`:
   
   - `druid.announcer.segmentsPerNode`
   - `druid.announcer.maxBytesPerNode`
   - `druid.announcer.skipLoadSpec`
   - `druid.announcer.skipDimensionsAndMetrics`
   - `druid.announcer.skipSegmentAnnouncementOnZk`
   - `druid.zk.paths.announcementsPath`
   - `druid.zk.paths.liveSegmentsPath`
   - `druid.zk.paths.propertiesPath`
   - `druid.zk.paths.connectorPath`
   
   ZooKeeper is still used for leader election, service (node) announcement and 
discovery, and Overlord-to-MiddleManager task management.
   
   [#19377](https://github.com/apache/druid/pull/19377)
   
   #### Jackson update
   
   If external code has both `@JacksonInject` and `@JsonProperty` on the same 
parameter and relies on the JSON value winning when supplied, add the explicit 
`useInput = OptBoolean.TRUE` to the annotation (or stay on Jackson `2.20.x`). 
All such sites in Druid itself have been updated.
   
   [#19528](https://github.com/apache/druid/pull/19528)
   
   ### Incompatible changes
   
   #### Java 17
   
   Support for Java 17 has been dropped. 
[#19304](https://github.com/apache/druid/pull/19304)
   
   ### Developer notes
   
   * Changed the shard spec collector to an interface to make extensibility 
easier [#19744](https://github.com/apache/druid/pull/19744)
   * Changed `iceberg.core.version` in root pom and aligned embedded tests to 
use `1.10.0`
   * Updated tests in `druid-processing` to use JUnit 5 
[#19601](https://github.com/apache/druid/pull/19601)
   * Updated the `apache/druid` and `apache/druid-website-src` repositories to 
use Docusaurus 3.10 when building the website 
[#19522](https://github.com/apache/druid/pull/19522)
   * Updated IntelliJ settings to match Druid's supported Java versions 
[#19661](https://github.com/apache/druid/pull/19661)
   
   #### Dependency updates
   
   The following dependencies have had their versions bumped:
   
   * `org.apache.logging.log4j` from `2.25.4` to `2.26.0` 
[#19629](https://github.com/apache/druid/pull/19629)
   * `com.fasterxml.jackson` from `2.21.3` to `2.21.4` 
[#19618](https://github.com/apache/druid/pull/19618)
   * `io.netty` from `4.2.12.Final` to `4.2.15.Final` 
[#19566](https://github.com/apache/druid/pull/19566)
   * `caffeine` from `2.9.3` to `3.2.4` 
[#19527](https://github.com/apache/druid/pull/19527)
   * `errorprone` from `2.41.0` to `2.49.0` 
[#19527](https://github.com/apache/druid/pull/19527)
   * `jackson` from `2.20.2` to `2.21.3` 
[#19528](https://github.com/apache/druid/pull/19528)
   * `derby` from `10.14.2.0` to `10.17.1.0` 
[#19492](https://github.com/apache/druid/pull/19492)
   * `postgres` from `42.7.2` to `42.7.11` 
[#19474](https://github.com/apache/druid/pull/19474)
   * `org.bouncycastle` from `1.82` to `1.84` 
[#19473](https://github.com/apache/druid/pull/19473)
   - Apache Kafka client and broker dependencies from `3.9.2` to `4.2.3` 
[#19441](https://github.com/apache/druid/pull/19441) 
[#19584](https://github.com/apache/druid/pull/19584)
   - `axios` from 1.15.0 to 1.15.2 
[#19430](https://github.com/apache/druid/pull/19430)
   - `pac4j` from `5.7.3` to `5.7.10` 
[#19388](https://github.com/apache/druid/pull/19388)
   - `jose.jwt` from `9.37.2` to `9.37.3` 
[#19388](https://github.com/apache/druid/pull/19388)
   - `log4j` from `2.25.3` to `2.25.4` 
[#19388](https://github.com/apache/druid/pull/19388)
   - `RoaringBitmap` from `1.6.13` to `1.6.14` 
[#19688](https://github.com/apache/druid/pull/19688)


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