com.netflix.hystrix.metric.consumer

Class RollingCommandLatencyDistributionStream

java.lang.Object

com.netflix.hystrix.metric.consumer.RollingDistributionStream<HystrixCommandCompletion>

com.netflix.hystrix.metric.consumer.RollingCommandLatencyDistributionStream

public class RollingCommandLatencyDistributionStream
extends RollingDistributionStream<HystrixCommandCompletion>

Maintains a stream of latency distributions for a given Command. There is a rolling window abstraction on this stream. The latency distribution object is calculated over a window of t1 milliseconds. This window has b buckets. Therefore, a new set of counters is produced every t2 (=t1/b) milliseconds t1 = HystrixCommandProperties.metricsRollingPercentileWindowInMilliseconds() b = HystrixCommandProperties.metricsRollingPercentileBucketSize() These values are stable - there's no peeking into a bucket until it is emitted The only latencies which get included in the distribution are for those commands which started execution. This relies on HystrixCommandEvent.didCommandExecute() These values get produced and cached in this class. The distributions can be queried on 2 dimensions: * Execution time or total time ** Execution time is the time spent executing the user-provided execution method. ** Total time is the time spent from the perspecitve of the consumer, and includes all Hystrix bookkeeping.

Method Summary

Methods

Modifier and Type	Method and Description
static RollingCommandLatencyDistributionStream	getInstance(HystrixCommandKey commandKey, HystrixCommandProperties properties)
static RollingCommandLatencyDistributionStream	getInstance(HystrixCommandKey commandKey, int numBuckets, int bucketSizeInMs)
static void	reset()

Methods inherited from class com.netflix.hystrix.metric.consumer.RollingDistributionStream

getLatestMean, getLatestPercentile, observe, startCachingStreamValuesIfUnstarted, unsubscribe

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getInstance

public static RollingCommandLatencyDistributionStream getInstance(HystrixCommandKey commandKey,
                                                  HystrixCommandProperties properties)

getInstance

public static RollingCommandLatencyDistributionStream getInstance(HystrixCommandKey commandKey,
                                                  int numBuckets,
                                                  int bucketSizeInMs)

reset

public static void reset()