spark ExecutorMetricsSource 源码
spark ExecutorMetricsSource 代码
文件路径：/core/src/main/scala/org/apache/spark/executor/ExecutorMetricsSource.scala
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.spark.executor
import com.codahale.metrics.{Gauge, MetricRegistry}
import org.apache.spark.metrics.{ExecutorMetricType, MetricsSystem}
import org.apache.spark.metrics.source.Source
/**
* Expose executor metrics from [[ExecutorMetricsType]] using the Dropwizard metrics system.
*
* Metrics related to the memory system can be expensive to gather, therefore
* we implement some optimizations:
* (1) Metrics values are cached, updated at each heartbeat (default period is 10 seconds).
* An alternative faster polling mechanism is used, only if activated, by setting
* spark.executor.metrics.pollingInterval=<interval in ms>.
* (2) Procfs metrics are gathered all in one-go and only conditionally:
* if the /proc filesystem exists
* and spark.executor.processTreeMetrics.enabled=true.
*/
private[spark] class ExecutorMetricsSource extends Source {
override val metricRegistry = new MetricRegistry()
override val sourceName = "ExecutorMetrics"
@volatile var metricsSnapshot: Array[Long] = Array.fill(ExecutorMetricType.numMetrics)(0L)
// called by ExecutorMetricsPoller
def updateMetricsSnapshot(metricsUpdates: Array[Long]): Unit = {
metricsSnapshot = metricsUpdates
}
private class ExecutorMetricGauge(idx: Int) extends Gauge[Long] {
def getValue: Long = metricsSnapshot(idx)
}
def register(metricsSystem: MetricsSystem): Unit = {
val gauges: IndexedSeq[ExecutorMetricGauge] = (0 until ExecutorMetricType.numMetrics).map {
idx => new ExecutorMetricGauge(idx)
}
ExecutorMetricType.metricToOffset.foreach {
case (name, idx) =>
metricRegistry.register(MetricRegistry.name(name), gauges(idx))
}
metricsSystem.registerSource(this)
}
}
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