feat(dashboard): add back_pressure_rate UI

dashboard/components/FragmentGraph.tsx

@@ -479,7 +479,6 @@ export default function FragmentGraph({
         <g className="fragment-edges" />
         <g className="fragments" />
       </svg>
-      {/* <BackPressureTable selectedFragmentIds={includedFragmentIds} /> */}
     </Fragment>
   )
 }

dashboard/pages/api/metric.ts

@@ -17,17 +17,148 @@
 import { Metrics, MetricsSample } from "../../components/metrics"
 import api from "./api"
 
+export const INTERVAL = 5000
 export interface BackPressuresMetrics {
   outputBufferBlockingDuration: Metrics[]
 }
 
+// Get back pressure from meta node -> prometheus
 export async function getActorBackPressures() {
   const res: BackPressuresMetrics = await api.get(
     "/metrics/actor/back_pressures"
   )
   return res
 }
 
+export interface BackPressureInfo {
+  actorId: number
+  fragmentId: number
+  downstreamFragmentId: number
+  value: number
+}
+
+export interface BackPressureRateInfo {
+  actorId: number
+  fragmentId: number
+  downstreamFragmentId: number
+  backPressureRate: number
+}
+
+function convertToMapAndAgg(
+  backPressures: BackPressureInfo[]
+): Map<string, number> {
+  // FragmentId-downstreamFragmentId, total value
+  const mapValue = new Map<string, number>()
+  // FragmentId-downstreamFragmentId, total count
+  const mapNumber = new Map<string, number>()
+  // FragmentId-downstreamFragmentId, average value
+  const map = new Map<string, number>()
+  for (const item of backPressures) {
+    const key = `${item.fragmentId}-${item.downstreamFragmentId}`
+    if (mapValue.has(key) && mapNumber.has(key)) {
+      // add || tp avoid NaN and pass check
+      mapValue.set(key, (mapValue.get(key) || 0) + item.value)
+      mapNumber.set(key, (mapNumber.get(key) || 0) + 1)
+    } else {
+      mapValue.set(key, item.value)
+      mapNumber.set(key, 1)
+    }
+  }
+
+  for (const [key, value] of mapValue) {
+    // add || 1 to avoid NaN and pass check
+    map.set(key, value / (mapNumber.get(key) || 1))
+  }
+  return map
+}
+
+function convertFromMapAndAgg(
+  map: Map<string, number>
+): BackPressureRateInfo[] {
+  const result: BackPressureRateInfo[] = []
+  map.forEach((value, key) => {
+    const [fragmentId, downstreamFragmentId] = key.split("-").map(Number)
+    const backPressureRateInfo: BackPressureRateInfo = {
+      actorId: 0,
+      fragmentId,
+      downstreamFragmentId,
+      backPressureRate: value,
+    }
+    result.push(backPressureRateInfo)
+  })
+  return result
+}
+
+function convertToBackPressureMetrics(
+  bpRates: BackPressureRateInfo[]
+): BackPressuresMetrics {
+  const bpMetrics: BackPressuresMetrics = {
+    outputBufferBlockingDuration: [],
+  }
+  for (const item of bpRates) {
+    bpMetrics.outputBufferBlockingDuration.push({
+      metric: {
+        actorId: item.actorId.toString(),
+        fragmentId: item.fragmentId.toString(),
+        downstreamFragmentId: item.downstreamFragmentId.toString(),
+      },
+      sample: [
+        {
+          timestamp: Date.now(),
+          value: item.backPressureRate,
+        },
+      ],
+    })
+  }
+  return bpMetrics
+}
+
+export function calculateBPRate(
+  backPressureNew: BackPressureInfo[],
+  backPressureOld: BackPressureInfo[]
+): BackPressuresMetrics {
+  let mapNew = convertToMapAndAgg(backPressureNew)
+  let mapOld = convertToMapAndAgg(backPressureOld)
+  let result = new Map<string, number>()
+  mapNew.forEach((value, key) => {
+    if (mapOld.has(key)) {
+      result.set(
+        key,
+        // The *100 in end of the formular is to convert the BP rate to the value used in web UI drawing
+        ((value - (mapOld.get(key) || 0)) / ((INTERVAL / 1000) * 1000000000)) *
+          100
+      )
+    } else {
+      result.set(key, 0)
+    }
+  })
+
+  return convertToBackPressureMetrics(convertFromMapAndAgg(result))
+}
+
+export const BackPressureInfo = {
+  fromJSON: (object: any) => {
+    return {
+      actorId: isSet(object.actorId) ? Number(object.actorId) : 0,
+      fragmentId: isSet(object.fragmentId) ? Number(object.fragmentId) : 0,
+      downstreamFragmentId: isSet(object.downstreamFragmentId)
+        ? Number(object.downstreamFragmentId)
+        : 0,
+      value: isSet(object.value) ? Number(object.value) : 0,
+    }
+  },
+}
+
+// Get back pressure from meta node -> compute node
+export async function getBackPressureWithoutPrometheus() {
+  const response = await api.get("/metrics/back_pressures")
+  let backPressureInfos: BackPressureInfo[] = response.backPressureInfos.map(
+    BackPressureInfo.fromJSON
+  )
+  backPressureInfos = backPressureInfos.sort((a, b) => a.actorId - b.actorId)
+  return backPressureInfos
+}
+
 function calculatePercentile(samples: MetricsSample[], percentile: number) {
   const sorted = samples.sort((a, b) => a.value - b.value)
   const index = Math.floor(sorted.length * percentile)
@@ -49,3 +180,7 @@ export function p95(samples: MetricsSample[]) {
 export function p99(samples: MetricsSample[]) {
   return calculatePercentile(samples, 0.99)
 }
+
+function isSet(value: any): boolean {
+  return value !== null && value !== undefined
+}