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Hystrix Releases

Version 1.4.0 Release Candidate 3 (Maven Central)

NOTE: This code is NOT considered production worthy yet, hence the "Release Candidate" status.

This adds non-blocking support to the collapser via the HystrixObservableCollapser type, fixes some bugs and upgrades to RxJava 0.18.

  • Pull 245 HystrixObservableCollapser
  • Pull 246 RxJava 0.18
  • Pull 250 Tripped CircuitBreaker Wouldn't Close Under Contention
  • Pull 243 Update servo to 0.6
  • Pull 240 Add missing reset for CommandExecutionHook in HystrixPlugins.UnitTest
  • Pull 244 Javanica: Cleaner error propagation

Version 1.4.0 Release Candidate 2 (Maven Central)

NOTE: This code is NOT considered production worthy yet, hence the "Release Candidate" status.

This fixes a bug found in Release Candidate 1 that caused the semaphore limits to be applied when thread isolation was chosen.

It also stops scheduling callbacks onto new threads and lets the Hystrix threads perform the callbacks.

  • Pull 238 Fix for Semaphore vs Thread Isolation Bug
  • Pull 230 Javanica Module: Added support for Request Cache and Reactive Execution

Version 1.4.0 Release Candidate 1 (Maven Central)

This is the first release candidate of 1.4.0 that includes HystrixObservableCommand (Source) that supports bulkheading asynchronous, non-blocking sources.

NOTE: This code is NOT considered production worthy yet, hence the "Release Candidate" status.

It has run for 1 day on a single machine taking production traffic at Netflix. This is sufficient for us to proceed to a release candidate for official canary testing, but we intend to test for a week or two before doing a final release.

Here is a very basic example using Java 8 to make an HTTP call via Netty and receives a stream of chunks back:

    public static void main(String args[]) {
        HystrixObservableCommand<String> command = bulkheadedNetworkRequest("www.google.com");
        command.toObservable()
                // using BlockingObservable.forEach for demo simplicity
                .toBlockingObservable().forEach(d -> System.out.println(d));
        System.out.println("Time: " + command.getExecutionTimeInMilliseconds() 
                + "  Events: " + command.getExecutionEvents());
    }

    public static HystrixObservableCommand<String> bulkheadedNetworkRequest(final String host) {
        return new HystrixObservableCommand<String>(HystrixCommandGroupKey.Factory.asKey("http")) {

            @Override
            protected Observable<String> run() {
                return directNetworkRequest(host);
            }

            @Override
            protected Observable<String> getFallback() {
                return Observable.just("Error 500");
            }

        };
    }

    public static Observable<String> directNetworkRequest(String host) {
        return RxNetty.createHttpClient(host, 80)
                .submit(HttpClientRequest.createGet("/"))
                .flatMap(response -> response.getContent())
                .map(data -> data.toString(Charset.defaultCharset()));
    }
  • Pull 218 Hystrix 1.4 - Async/Non-Blocking
  • Pull 217 Javanica: Added support for "Reactive Execution" and "Error Propagation"
  • Pull 219 Restore HystrixContext* Constructors without ConcurrencyStrategy

Version 1.3.16 (Maven Central)

  • Pull 258 Skip CachedObservableOriginal when no getCacheKey()
  • Pull 259 Fix #257 with RxJava 0.18.2

Version 1.3.15 (Maven Central)

  • Pull 248 RxJava 0.18 for Hystrix
  • Pull 249 Tripped CircuitBreaker Wouldn't Close Under Contention
  • Pull 229 Javanica: Added support for Request Cache and Reactive Execution
  • Pull 242 Javanica: Cleaner error propagation

Version 1.3.14 (not released)

  • Pull 228 Upgrade 1.3.x to RxJava 0.17.1

Version 1.3.13 (Maven Central)

Version 1.3.12 (Maven Central)

  • Pull 214 HystrixContextCallable/Runnable Constructors

Version 1.3.11 (Maven Central)

  • We'll ignore this release ever happened. Exact same binary as 1.3.10. (It helps to push code to Github before releasing.)

Version 1.3.10 (Maven Central)

  • Pull 211 Update Javassist version to 3.18.1-GA
  • Pull 213 BugFix: Timeout does not propagate request context
  • Pull 204 deploying hystrix dashboard on tomcat, SLF4J complains about a missing implementation
  • Pull 199 Add new module for publishing metrics to Coda Hale Metrics version 3

Version 1.3.9 (Maven Central)

  • Pull 210 HystrixContextScheduler was not wrapping the Inner Scheduler
  • Pull 206 Bugfix ExceptionThreadingUtility
  • Pull 203 Made HystrixTimer initialization thread-safe

Version 1.3.8 (Maven Central)

  • Pull 194 BugFix: Do not overwrite user thread duration in case of timeouts

Version 1.3.7 (Maven Central)

  • Pull 189 BugFix: Race condition between run() and timeout
  • Pull 190 BugFix: ConcurrencyStrategy.wrapCallable was not being used on callbacks

Version 1.3.6 (Maven Central)

  • Pull 181 [hystrix-contrib/hystrix-clj] Making Command keys quantified by namespaces
  • Pull 182 Removing unused Legend component latent. Removed from html templates/css
  • Pull 183 Bugfix to HystrixBadRequestException handling
  • Pull 184 BugFix: queue() BadRequestException Handling on Cached Response
  • Pull 185 BugFix: Observable.observeOn Scheduler Lost RequestContext
  • 0fb0d3d RxJava 0.14

Version 1.3.5 (Maven Central)

Version 1.3.4 (Maven Central)

Version 1.3.3 (Maven Central)

Version 1.3.2 (Maven Central)

  • Pull 173 Fix Exception vs Throwable typo in preparation for RxJava 0.11.0

Version 1.3.1 (Maven Central)

  • Pull 170 Add rx support to hystrix-clj

Version 1.3.0 (Maven Central)

This version integrations Hystrix with RxJava to enable non-blocking reactive execution and functional composition.

Async execution can now be done reactively with the observe() method and it will callback when the value is received:

Observable<String> s = new CommandHelloWorld("World").observe();

A simple example of subscribing to the value (using a Groovy lambda instead of anonymous inner class):

s.subscribe({ value -> println(value) })

A "Hello World" example of reactive execution can be found on the wiki.

More can be learned about RxJava and the composition features at https://github.com/Netflix/RxJava/wiki

This release is a major refactoring of the Hystrix codebase. To assert correctness and performance it was run in production canary servers on the Netflix API several times during development and for over a week during release candidate stages. Prior to this release the 1.3.0.RC1 version has been running in full Netflix API production for several days performing billions of executions a day.

  • Pull 151 Version 1.3 - RxJava Observable Integration
  • Pull 158 Expose current HystrixCommand to fns

Version 1.2.18 (Maven Central)

  • Pull 152 Escape meta-characters to fix dashboard
  • Pull 156 Improve hystrix-clj docs
  • Pull 155 Reset Hystrix after hystrix-clj tests have run

Version 1.2.17 (Maven Central)

  • Pull 138 Eclipse and IDEA Config
  • Pull 141 Upgrade Clojuresque (hystrix-clj builds)
  • Pull 139 Fix dashboard math bug on thread pool rate calculations
  • Pull 149 Allow getFallback to query failure states

Version 1.2.16 (Maven Central)

  • Pull 132 Add with-context macro for conviently wrapping collapsers in thier own context
  • Pull 136 Fixed the mock stream
  • Pull 137 Limit scope of CurrentThreadExecutingCommand

Version 1.2.15 (Maven Central)

This is fixing a bug introduced in the last release that affects semaphore isolated commands that use request caching.

Version 1.2.14 (Maven Central)

  • Issue 116 Mechanism for Auditing Network Access Not Isolated by Hystrix

A new module for instrumenting network access to identify calls not wrapped by Hystrix.

See the module README for more information: https://github.com/Netflix/Hystrix/tree/master/hystrix-contrib/hystrix-network-auditor-agent

Version 1.2.13 (Maven Central)

  • Issue 127 Add destroy() method to MetricsServlet

Version 1.2.12 (Maven Central)

  • Issue 124 NPE if Hystrix.reset() called when it's already shutdown

Version 1.2.11 (Maven Central)

  • Issue 113 IllegalStateException: Future Not Started (on thread pool rejection with response caching)
  • Issue 118 Semaphore counter scope was global instead of per-key
  • Pull 121 Concurrent execution metric for semaphore and thread isolation

Version 1.2.10 (Maven Central)

  • Issue 80 HystrixCollapser Concurrency and Performance Fixes

Version 1.2.9 (Maven Central)

Version 1.2.8 (Maven Central)

  • Issue 102 Hystrix.reset() functionality for clean shutdown and resource cleanup
  • Pull 103 hystrix-clj cleanup
  • Pull 104 javadoc clarification
  • Pull 105 Added IntelliJ IDEA support, cleanup to Eclipse support

Version 1.2.7 (Maven Central)

Version 1.2.6 (Maven Central)

  • Issue 96 Remove 'final' modifiers to allow mocking

Version 1.2.5 (Maven Central)

  • Pull 94 Force character encoding for event stream to utf-8
  • Issue 60 Dashboard: Hover for full name (when shortened with ellipsis)
  • Issue 53 RequestLog: Reduce Chance of Memory Leak

Version 1.2.4 (Maven Central)

  • Pull 91 handle null circuit breaker in HystrixMetricsPoller

Version 1.2.3 (Maven Central)

  • Issue 85 hystrix.stream holds connection open if no metrics
  • Pull 84 include 'provided' dependencies in Eclipse project classpath

Version 1.2.2 (Maven Central)

  • Issue 82 ThreadPool stream should include reportingHosts

Version 1.2.1 (Maven Central)

  • Issue 80 IllegalStateException: Future Not Started
  • Issue 78 Include more info when collapsed requests remain in queue

Version 1.2.0 (Maven Central)

  • Issue 10 HystrixCommand Execution Hooks via Plugin
    • Pull 71 Change Throwable to Exception
    • Pull 71 jettyRun support for running webapps via gradle
  • Issue 15 Property to disable percentile calculations
  • Issue 69 Property to disable fallbacks
  • Pull 73 Make servlet-api a provided dependency
  • Pull 74 Dashboard problem when using Turbine (Stream not flushing)

Version 1.1.7 (Maven Central)

  • Pull 67 Unit tests for request log and checked exceptions
  • Pull 66 Making provided scope transtive
  • Pull 65 Fixed gitignore definition of build output directories
  • Issue 63 Add "throws Exception" to HystrixCommand run() method
  • Pull 62 applying js fixes to threadPool ui
  • Pull 61 Request log with timeouts
  • Issue 55 HysrixRequestLog: Missing Events and Time on Timeouts
  • Issue 20 TotalExecutionTime not tracked on queue()
  • Pull 57 Dashboard js fix
  • Issue 39 HystrixPlugins Bootstrapping Problem - Race Conditions
  • Pull 52 Gradle Build Changes

Version 1.1.6

  • Pull 51 Merging in gradle-template, specifically provided

Version 1.1.5

  • Pull 50 Make javax.servlet-api a 'provided' dependency not 'compile'

Version 1.1.4

  • Pull 49 Cleaner design (for metrics) by injecting listener into constructor.

Version 1.1.3

  • Pull 47 Support pausing/resuming metrics poller
  • Pull 48 Fixing non-deterministic unit test
  • README files added to submodules

Version 1.1.2

Version 1.1.1

  • Issue 24 Yammer Metrics Support
  • Pull 43 Fix the wrong percentile for latencyExecute_percentile_75 in the Servo publisher

Version 1.1.0

  • Pull 32 servo-event-stream module
  • Pull 33 Remove Servo dependency from core, move to submodule
  • Pull 35 Metrics event stream
  • Issue 34 Remove Strategy Injection on HystrixCommand
  • Pull 36 example webapp
  • Pull 37 Migrate metrics stream from org.json.JSONObject to Jackson

Version 1.0.3

  • Pull 4 Contrib request context servlet filters
  • Pull 16 Change logger from info to debug for property changes
  • Issue 12 Use logger.error not logger.debug for fallback failure
  • Issue 8 Capture exception from run() and expose getter
  • Issue 22 Default Collapser scope to REQUEST if using Setter
  • Pull 27 Initialize HealthCounts to non-null value
  • Issue 28 Thread pools lost custom names in opensource refactoring
  • Pull 30 Simplified access to HystrixCommandMetrics
  • Javadoc and README changes

Version 1.0.2

  • Javadoc changes

Version 1.0.0

  • Initial open source release