Release Druid 0.8.3 - Stable · apache/druid

Updating from 0.8.x

You must set druid.selectors.coordinator.serviceName to your Coordinator's druid.service value (defaults to druid/coordinator) in common.runtime.properties of all nodes. Realtime handoff will only work if this config is properly set. (See #2015)
Instead of the normal rolling update procedure, for this release you should update your Coordinator nodes before updating the overlord. (See #2015)
Min/max aggregators are now deprecated and will be removed in Druid 0.9.0. Please use longMin, longMax, doubleMin, or doubleMax aggregators as appropriate.

#1770 Add segment merge time as a metric
#1791 EventReceiverFirehoseMonitor
#1824 Add hashCode and equals to UniformGranularitySpec
#1889 update server metrics and emitter version
#1920 Update curator to 2.9.1
#1929 separate ingestion and query thread pool
#1960 optimize index merge
#1967 Add datasource and taskId to metrics emitted by peons
#1973 CacheMonitor - make cache injection optional
#2015 Remove ServerView from RealtimeIndexTasks and use coordinator http endpoint for handoffs
#2045 Update mmx emitter to 0.3.6
#2145 druid.indexer.task.restoreTasksOnRestart configuration

#1387 Add special handler to allow logger messages during shutdown
#1799 Support multiple outer aggregators of same type
#1815 Fix Race in jar upload during hadoop indexing
#1842 Do not pass druid.indexer.runner.javaOpts to Peon as a property
#1867 fixing hadoop test scope dependencies in indexing-hadoop
#1888 forward cancellation request to all brokers, fixes #1802
#1917 RemoteTaskActionClient: Fix statusCode check.
#1932 DataSchema: Exclude metric names from dimension list.
#1935 ForkingTaskRunner: Log without buffering.
#1940 Move Jackson Guice adapters into io.druid
#1954 EC2 autoscaler: avoid hitting aws filter limits
#1985 Change LookupExtractionFn cache key to be unique
#2036 Disable javadoc linting
#1973 Make cache injection optional
#2141 Fix some problems with restoring
#2227 Update bytebuffer-collections to 0.2.4 (upstream bugfixes in roaring bitmaps)
#2240 Fix loadRule when one of the tiers had no available servers
#2207 Fix bug for thetaSketch metric not working with select queries
#2266 Fix loss in segment announcements when segments do not fit in zNode
#2189 add ChatHandlerServerModule to realtime example
#2338 Fix tutorial so indexing service can start up

Thanks to all the contributors to this release!