动态修改hystrix配置项

Hystrix默认使用Archaius来实现的动态配置，下面是一个Command的实现：

Archaius 默认支持两种方式来加载本地的配置文件：

1. 默认情况下，Archaius默认会加载classpath下的config.properties文件
2. 在程序启动的时候，加如下的启动参数：-Darchaius.configurationSource.additionalUrls=file:///apps/myapp/application.properties

注：在代码中动态修改配置项的值，是无效的。

Hystrix支持的动态配置列表如下：

官网：https://github.com/Netflix/Hystrix/wiki/Configuration

Command Properties

1. Execution

• 1. execution.isolation.strategy
  2. execution.isolation.thread.timeoutInMilliseconds
  3. execution.timeout.enabled
  4. execution.isolation.thread.interruptOnTimeout
  5. execution.isolation.thread.interruptOnCancel
  6. execution.isolation.semaphore.maxConcurrentRequests

1. Fallback

• 1. fallback.isolation.semaphore.maxConcurrentRequests
  2. fallback.enabled

1. Circuit Breaker

• 1. circuitBreaker.enabled
  2. circuitBreaker.requestVolumeThreshold
  3. circuitBreaker.sleepWindowInMilliseconds
  4. circuitBreaker.errorThresholdPercentage
  5. circuitBreaker.forceOpen
  6. circuitBreaker.forceClosed

1. Metrics

• 1. metrics.rollingStats.timeInMilliseconds
  2. metrics.rollingStats.numBuckets
  3. metrics.rollingPercentile.enabled
  4. metrics.rollingPercentile.timeInMilliseconds
  5. metrics.rollingPercentile.numBuckets
  6. metrics.rollingPercentile.bucketSize
  7. metrics.healthSnapshot.intervalInMilliseconds

1. Request Context

• 1. requestCache.enabled
  2. requestLog.enabled

Collapser Properties

1. maxRequestsInBatch
2. timerDelayInMilliseconds
3. requestCache.enabled

Thread Pool Properties

1. coreSize
2. maximumSize
3. maxQueueSize
4. queueSizeRejectionThreshold
5. keepAliveTimeMinutes
6. allowMaximumSizeToDivergeFromCoreSize
7. metrics.rollingStats.timeInMilliseconds
8. metrics.rollingStats.numBuckets

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