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The Capacity metric is defined as:

Capacity = Execute latency * Executed over a window / Window size

In the example table below,

  • Capacity is the column in green, which measures the capacity in the last 10 minutes, named as Capacity (last 10m);
  • Execute latency is the 2nd pink column, named as Execute latency (ms);
  • Executed over a window is the 3rd pink column, named as Executed;
  • Window size is the 1st pink column, named Uptime.

To calculate the capacity for the first executor (Id: 10-10), Capacity = 1916.9 * 200 / 595000 = 0.644

To calculate the overall measurements for all the executors in one type of bolt, use the metrics as:

Capacity = Max(executor Capacity)
Execute latency = Average(executor Execute latency)
Executed = Sum(executor Executed)


注：这个值显示了这个bolt的空限度，这个值约大，说明这个bolt很忙，spout过来的流速太快，处理不过来了，这时就需要增加这个bolt的数量。


本文标签： StormCapacityMetric

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