- Exposed Storm's unit testing facilities via the backtype.storm.Testing class. Notable functions are Testing/withLocalCluster and Testing/completeTopology (thanks xumingming)
- Implemented pluggable spout wait strategy that is invoked when a spout emits nothing from nextTuple or when a spout hits the MAX_SPOUT_PENDING limit
- Spouts now have a default wait strategy of a 1 millisecond sleep
- Changed log level of "Failed message" logging to DEBUG
- Deprecated LinearDRPCTopologyBuilder, TimeCacheMap, and transactional topologies
- During "storm jar", whether topology is already running or not is checked before submitting jar to save time (thanks jasonjckn)
- Added BaseMultiReducer class to Trident that provides empty implementations of prepare and cleanup
- Added Negate builtin operation to reverse a Filter
- Added topology.kryo.decorators config that allows functions to be plugged in to customize Kryo (thanks jasonjckn)
- Enable message timeouts when using LocalCluster
- Multilang subprocesses can set "need_task_ids" to false when emitting tuples to tell Storm not to send task ids back (performance optimization) (thanks barrywhart)
- Add contains method on Tuple (thanks okapies)
- Added ISchemableSpout interface
- Bug fix: When an item is consumed off an internal buffer, the entry on the buffer is nulled to allow GC to happen on that data
- Bug fix: Helper class for Trident MapStates now clear their read cache when a new commit happens, preventing updates from spilling over from a failed batch attempt to the next attempt
- Bug fix: Fix NonTransactionalMap to take in an IBackingMap for regular values rather than TransactionalValue (thanks sjoerdmulder)
- Bug fix: Fix NPE when no input fields given for regular Aggregator
- Bug fix: Fix IndexOutOfBoundsExceptions when a bolt for global aggregation had a parallelism greater than 1 (possible with splitting, stateQuerying, and multiReduce)
- Bug fix: Fix "fields size" error that would sometimes occur when splitting a stream with multiple eaches
- Bug fix: Fix bug where a committer spout (including opaque spouts) could cause Trident batches to fail
- Bug fix: Fix Trident bug where multiple groupings on same stream would cause tuples to be duplicated to all consumers
- Bug fix: Fixed error when repartitioning stream twice in a row without any operations in between
- Bug fix: Fix rare bug in supervisor where it would continuously fail to clean up workers because the worker was already partially cleaned up
- Bug fix: Fix emitDirect in storm.py
- Added Trident, the new high-level abstraction for intermixing high throughput, stateful stream processing with low-latency distributed querying
- Added executor abstraction between workers and tasks. Workers = processes, executors = threads that run many tasks from the same spout or bolt.
- Pluggable scheduler (thanks xumingming)
- Eliminate explicit storage of task->component in Zookeeper
- Number of workers can be dynamically changed at runtime through rebalance command and -n switch
- Number of executors for a component can be dynamically changed at runtime through rebalance command and -e switch (multiple -e switches allowed)
- Use worker heartbeats instead of task heartbeats (thanks xumingming)
- UI performance for topologies with many executors/tasks much faster due to optimized usage of Zookeeper (10x improvement)
- Added button to show/hide system stats (e.g., acker component and stream stats) from the Storm UI (thanks xumingming)
- Stats are tracked on a per-executor basis instead of per-task basis
- Major optimization for unreliable spouts and unanchored tuples (will use far less CPU)
- Revamped internals of Storm to use LMAX disruptor for internal queuing. Dramatic reductions in contention and CPU usage.
- Numerous micro-optimizations all throughout the codebase to reduce CPU usage.
- Optimized internals of Storm to use much fewer threads - two fewer threads per spout and one fewer thread per acker.
- Removed error method from task hooks (to be re-added at a later time)
- Validate that subscriptions come from valid components and streams, and if it's a field grouping that the schema is correct (thanks xumingming)
- MemoryTransactionalSpout now works in cluster mode
- Only track errors on a component by component basis to reduce the amount stored in zookeeper (to speed up UI). A side effect of this change is the removal of the task page in the UI.
- Add TOPOLOGY-TICK-TUPLE-FREQ-SECS config to have Storm automatically send "tick" tuples to a bolt's execute method coming from the __system component and __tick stream at the configured frequency. Meant to be used as a component-specific configuration.
- Upgrade Kryo to v2.17
- Tuple is now an interface and is much cleaner. The Clojure DSL helpers have been moved to TupleImpl
- Added shared worker resources. Storm provides a shared ExecutorService thread pool by default. The number of threads in the pool can be configured with topology.worker.shared.thread.pool.size
- Improve CustomStreamGrouping interface to make it more flexible by providing more information
- Enhanced INimbus interface to allow for forced schedulers and better integration with global scheduler
- Added assigned method to ISupervisor so it knows exactly what's running and not running
- Custom serializers can now have one of four constructors: (), (Kryo), (Class), or (Kryo, Class)
- Disallow ":", ".", and "" from topology names
- Errors in multilang subprocesses that go to stderr will be captured and logged to the worker logs (thanks vinodc)
- Workers detect and warn for missing outbound connections from assignment, drop messages for which there's no outbound connection
- Zookeeper connection timeout is now configurable (via storm.zookeeper.connection.timeout config)
- Storm is now less aggressive about halting process when there are Zookeeper errors, preferring to wait until client calls return exceptions.
- Can configure Zookeeper authentication for Storm's Zookeeper clients via "storm.zookeeper.auth.scheme" and "storm.zookeeper.auth.payload" configs
- Supervisors only download code for topologies assigned to them
- Include task id information in task hooks (thanks velvia)
- Use execvp to spawn daemons (replaces the python launcher process) (thanks ept)
- Expanded INimbus/ISupervisor interfaces to provide more information (used in Storm/Mesos integration)
- Bug fix: Realize task ids when worker heartbeats to supervisor. Some users were hitting deserialization problems here in very rare cases (thanks herberteuler)
- Bug fix: Fix bug where a topology's status would get corrupted to true if nimbus is restarted while status is rebalancing
- Bug fix: Disallow slashes in topology names since it causes Nimbus to break by affecting local filesystem and zookeeper paths
- Bug fix: Prevent slow loading tasks from causing worker timeouts by launching the heartbeat thread before tasks are loaded
- Changed debug level of "Failed message" logging to DEBUG
- Bug fix: Fixed critical regression in 0.7.2 that could cause workers to timeout to the supervisors or to Nimbus. 0.7.2 moved all system tasks to the same thread, so if one took a long time it would block the other critical tasks. Now different system tasks run on different threads.
NOTE: The change from 0.7.0 in which OutputCollector no longer assumes immutable inputs has been reverted to support optimized sending of tuples to colocated tasks
- Messages sent to colocated tasks are sent in-memory, skipping serialization (useful in conjunction with localOrShuffle grouping) (thanks xumingming)
- Upgrade to Clojure 1.4 (thanks sorenmacbeth)
- Exposed INimbus and ISupervisor interfaces for running Storm on different resource frameworks (like Mesos).
- Can override the hostname that supervisors report using "storm.local.hostname" config.
- Make request timeout within DRPC server configurable via "drpc.request.timeout.secs"
- Added "storm list" command to show running topologies at the command line (thanks xumingming)
- Storm UI displays the release version (thanks xumingming)
- Added reportError to BasicOutputCollector
- Added reportError to BatchOutputCollector
- Added close method to OpaqueTransactionalSpout coordinator
- Added "storm dev-zookeeper" command for launching a local zookeeper server. Useful for testing a one node Storm cluster locally. Zookeeper dir configured with "dev.zookeeper.path"
- Use new style classes for Python multilang adapter (thanks hellp)
- Added "storm version" command
- Heavily refactored and simplified the supervisor and worker code
- Improved error message when duplicate config files found on classpath
- Print the host and port of Nimbus when using the storm command line client
- Include as much of currently read output as possible when pipe to subprocess is broken in multilang components
- Lower supervisor worker start timeout to 120 seconds
- More debug logging in supervisor
- "nohup" no longer used by supervisor to launch workers (unnecessary)
- Throw helpful error message if StormSubmitter used without using storm client script
- Add Values class as a default serialization
- Bug fix: give absolute piddir to subprocesses (so that relative paths can be used for storm local dir)
- Bug fix: Fixed critical bug in transactional topologies where a batch would be considered successful even if the batch didn't finish
- Bug fix: Fixed critical bug in opaque transactional topologies that would lead to duplicate messages when using pipelining
- Bug fix: Workers will now die properly if a ShellBolt subprocess dies (thanks tomo)
- Bug fix: Hide the BasicOutputCollector#getOutputter method, since it shouldn't be a publicly available method
- Bug fix: Zookeeper in local mode now always gets an unused port. This will eliminate conflicts with other local mode processes or other Zookeeper instances on a local machine. (thanks xumingming)
- Bug fix: Fixed NPE in CoordinatedBolt it tuples emitted, acked, or failed for a request id that has already timed out. (thanks xumingming)
- Bug fix: UI no longer errors for topologies with no assigned tasks (thanks xumingming)
- Bug fix: emitDirect on SpoutOutputCollector now works
- Bug fix: Fixed NPE when giving null parallelism hint for spout in TransactionalTopologyBuilder (thanks xumingming)
- Implemented shell spout (thanks tomo)
- Shell bolts can now asynchronously emit/ack messages (thanks tomo)
- Added hooks for when a tuple is emitted, acked, or failed in bolts or spouts.
- Added activate and deactivate lifecycle methods on spouts. Spouts start off deactivated.
- Added isReady method to ITransactionalSpout$Coordinator to give the ability to delay the creation of new batches
- Generalized CustomStreamGrouping to return the target tasks rather than the indices. Also parameterized custom groupings with TopologyContext. (not backwards compatible)
- Added localOrShuffle grouping that will send to tasks in the same worker process if possible, or do a shuffle grouping otherwise.
- Removed parameter from TopologyContext#maxTopologyMessageTimeout (simplification).
- Storm now automatically sets TOPOLOGY_NAME in the config passed to the bolts and spouts to the name of the topology.
- Added TOPOLOGY_AUTO_TASK_HOOKS config to automatically add hooks into every spout/bolt for the topology.
- Added ability to override configs at the command line. These config definitions have the highest priority.
- Error thrown if invalid (not json-serializable) topology conf used.
- bin/storm script can now be symlinked (thanks gabrielgrant)
- Socket timeout for DRPCClient is now configurable
- Added getThisWorkerPort() method to TopologyContext
- Added better error checking in Fields (thanks git2samus)
- Improved Clojure DSL to allow destructuring in bolt/spout methods
- Added Nimbus stats methods to LocalCluster (thanks KasperMadsen)
- Added rebalance, activate, deactivate, and killTopologyWithOpts methods to LocalCluster
- Added custom stream groupings to LinearDRPC API
- Simplify multilang protocol to use json for all messages (thanks tomoj)
- Bug fix: Fixed string encoding in ShellBolt protocol to be UTF-8 (thanks nicoo)
- Bug fix: Fixed race condition in FeederSpout that could lead to dropped messages
- Bug fix: Quoted arguments with spaces now work properly with storm client script
- Bug fix: Workers start properly when topology name has spaces
- Bug fix: UI works properly when there are spaces in topology or spout/bolt names (thanks xiaokang)
- Bug fix: Tuple$Seq now returns correct count (thanks travisfw)
- 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 [NOTE: this was reverted in 0.7.2 because it conflicts with sending tuples to colocated tasks without serialization]
- 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!