• Transactional topologies: a new higher level abstraction that enables exactly-once messaging semantics for most computations. Documented on the wiki.
  • Component-specific configurations: Can now set configurations on a per-spout or per-bolt basis.
  • New batch bolt abstraction that simplifies the processing of batches in DRPC or transactional topologies. A new batch bolt is created per batch and they are automatically cleaned up.
  • Introduction of base classes for various bolt and spout types. These base classes are in the backtype.storm.topology.base package and provide empty implementations for commonly unused methods
  • CoordinatedBolt generalized to handle non-linear topologies. This will make it easy to implement a non-linear DRPC topology abstraction.
  • Can customize the JVM options for Storm UI with new ui.childopts config
  • BigIntegers are now serializable by default
  • All bolts/spouts now emit a system stream (id “__system”). Currently it only emits startup events, but may emit other events in the future.
  • Optimized tuple trees for batch processing in DRPC and transactional topologies. Only the coordination tuples are anchored. OutputCollector#fail still works because CoordinatedBolt will propagate the fail to all other tuples in the batch.
  • CoordinatedBolt moved to backtype.storm.coordination package
  • Clojure test framework significantly more composable
  • Massive internal refactorings and simplifications, including changes to the Thrift definition for storm topologies.
  • Optimized acking system. Bolts with zero or more than one consumer used to send an additional ack message. Now those are no longer sent.
  • Changed interface of CustomStreamGrouping to receive a List rather than a Tuple.
  • Added “storm.zookeeper.retry.times” and “storm.zookeeper.retry.interval” configs (thanks killme2008)
  • Added “storm help” and “storm help {cmd}” to storm script (thanks kachayev)
  • Logging now always goes to logs/ in the Storm directory, regardless of where you launched the daemon (thanks haitaoyao)
  • Improved Clojure DSL: can emit maps and Tuples implement the appropriate interfaces to integrate with Clojure's seq functions (thanks schleyfox)
  • Added “ui.childopts” config (thanks ddillinger)
  • Bug fix: OutputCollector no longer assumes immutable inputs
  • Bug fix: DRPC topologies now throw a proper error when no DRPC servers are configured instead of NPE (thanks danharvey)
  • Bug fix: Fix local mode so multiple topologies can be run on one LocalCluster
  • Bug fix: “storm supervisor” now uses supervisor.childopts instead of nimbus.childopts (thanks ddillinger)
  • Bug fix: supervisor.childopts and nimbus.childopts can now contain whitespace. Previously only the first token was taken from the string
  • Bug fix: Make TopologyContext “getThisTaskIndex” and “getComponentTasks” consistent
  • Bug fix: Fix NoNodeException that would pop up with task heartbeating under heavy load
  • Bug fix: Catch InterruptedExceptions appropriately in local mode so shutdown always works properly


  • Automatically delete old files in Nimbus's inbox. Configurable with “nimbus.cleanup.inbox.freq.secs” and “nimbus.inbox.jar.expiration.secs”
  • Redirect System.out and System.err to log4j
  • Added “topology.worker.child.opts” config, for topology-configurable worker options.
  • Use Netflix‘s Curator library for Zookeeper communication. Workers now reconnect to Zookeeper rather than crash when there’s a disconnection.
  • Bug fix: DRPC server no longer hangs with too many concurrent requests. DPRC server now requires two ports: “drpc.port” and “drpc.invocations.port”
  • Bug fix: Multilang resources are now extracted from the relevant jar on the classpath when appropriate. Previously an error would be thrown if the resources/ dir was in a jar in local mode.
  • Bug fix: Fix race condition in unit testing where time simulation fails to detect that Storm cluster is waiting due to threads that are not alive
  • Bug fix: Fix deadlock in Nimbus that could be triggered by a kill command.


  • storm client “activate” and “deactivate” commands
  • storm client “rebalance” command
  • Nimbus will automatically detect and cleanup corrupt topologies (this would previously give an error of the form “file storm...ser cannot be found”).
  • “storm” client will not run unless it's being used from a release.
  • Topology jar path now passed in using a java property rather than an environment variable.
  • LD_LIBRARY_PATH environment variable is now set on worker processes appropriately.
  • Replaced jvyaml with snakeyaml. UTF-8 YAML files should now work properly.
  • Upgraded httpclient, httpcore, and commons-codec dependencies.


  • New serialization system based on Kryo
  • Component and stream ids are now strings
  • Pluggable stream groupings
  • Storm now chooses an unused port for Zookeeper in local mode instead of crashing when 2181 was in use.
  • Better support for defining topologies in non-JVM languages. The Thrift structure for topologies now allows you to specify components using a Java class name and a list of arguments to that class's constructor.
  • Bug fix: errors during the preparation phase of spouts or bolts will be reported to the Storm UI
  • Bug fix: Fixed bugs related to LinearDRPC topologies where the last bolt implements FinishedCallback
  • Bug fix: String greater than 64K will now serialize properly
  • Generalized type of anchors in OutputCollector methods to Collection from List.
  • Improved logging throughout.
  • In the “worker.childopts” config, %ID% will be replaced by the worker port.
  • Significant internal refactorings to clean up the codebase.


  • LinearDRPCTopologyBuilder, a polished DRPC implementation,
  • Improved custom serialization support. no longer need to provide “token” ids.
  • Fallback on Java serialization by default. Can be turned off by setting “topology.fall.back.on.java.serialization” to false.
  • Improved “storm kill” command. Can override the wait time with “-w” flag.
  • Display topology status in Storm UI
  • Changed Thrift namespace to avoid conflicts
  • Better error messages throughout
  • Storm UI port is configurable through “ui.port”
  • Minor improvements to Clojure DSL


  • Nimbus and supervisor daemons can now share a local dir.
  • Greatly improved Clojure DSL for creating topologies.
  • Increased the default timeouts for startup of workers and tasks.
  • Added the commands “localconfvalue”, “remoteconfvalue”, and “repl” to the storm script.
  • Better error message when “storm jar” can't find the nimbus host in the configuration.


  • No longer need any native dependencies to run Storm in local mode. Storm now uses a pure Java messaging system in local mode
  • Fixed logging configurations so that logging is no longer suppressed when including the Storm release jars on the classpath in local mode.


  • Changed ISerialization's “accept” interface to not annotate the Class with the generic type
  • Made Config class implement Map and added helper methods for setting common configs


  • Initial release!