Examples of com.netflix.hystrix.util.HystrixRollingPercentile

com.netflix.hystrix.util.HystrixRollingPercentile

Add values to a rolling window and retrieve percentile calculations such as median, 90th, 99th, etc.

The underlying data structure contains a circular array of buckets that "roll" over time.

For example, if the time window is configured to 60 seconds with 12 buckets of 5 seconds each, values will be captured in each 5 second bucket and rotate each 5 seconds.

This means that percentile calculations are for the "rolling window" of 55-60 seconds up to 5 seconds ago.

Each bucket will contain a circular array of long values and if more than the configured amount (1000 values for example) it will wrap around and overwrite values until time passes and a new bucket is allocated. This sampling approach for high volume metrics is done to conserve memory and reduce sorting time when calculating percentiles.

    /* package */HystrixCommandMetrics(HystrixCommandKey key, HystrixCommandGroupKey commandGroup, HystrixCommandProperties properties, HystrixEventNotifier eventNotifier) {
        this.key = key;
        this.group = commandGroup;
        this.properties = properties;
        this.counter = new HystrixRollingNumber(properties.metricsRollingStatisticalWindowInMilliseconds(), properties.metricsRollingStatisticalWindowBuckets());
        this.percentileExecution = new HystrixRollingPercentile(properties.metricsRollingPercentileWindowInMilliseconds(), properties.metricsRollingPercentileWindowBuckets(), properties.metricsRollingPercentileBucketSize(), properties.metricsRollingPercentileEnabled());
        this.percentileTotal = new HystrixRollingPercentile(properties.metricsRollingPercentileWindowInMilliseconds(), properties.metricsRollingPercentileWindowBuckets(), properties.metricsRollingPercentileBucketSize(), properties.metricsRollingPercentileEnabled());
        this.eventNotifier = eventNotifier;
    }

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