spark MetricsServlet 源码
spark MetricsServlet 代码
文件路径：/core/src/main/scala/org/apache/spark/metrics/sink/MetricsServlet.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.metrics.sink
import java.util.Properties
import java.util.concurrent.TimeUnit
import javax.servlet.http.HttpServletRequest
import com.codahale.metrics.MetricRegistry
import com.codahale.metrics.json.MetricsModule
import com.fasterxml.jackson.databind.ObjectMapper
import org.eclipse.jetty.servlet.ServletContextHandler
import org.apache.spark.SparkConf
import org.apache.spark.ui.JettyUtils._
private[spark] class MetricsServlet(
val property: Properties, val registry: MetricRegistry) extends Sink {
val SERVLET_KEY_PATH = "path"
val SERVLET_KEY_SAMPLE = "sample"
val SERVLET_DEFAULT_SAMPLE = false
val servletPath = property.getProperty(SERVLET_KEY_PATH)
val servletShowSample = Option(property.getProperty(SERVLET_KEY_SAMPLE)).map(_.toBoolean)
.getOrElse(SERVLET_DEFAULT_SAMPLE)
val mapper = new ObjectMapper().registerModule(
new MetricsModule(TimeUnit.SECONDS, TimeUnit.MILLISECONDS, servletShowSample))
def getHandlers(conf: SparkConf): Array[ServletContextHandler] = {
Array[ServletContextHandler](
createServletHandler(servletPath,
new ServletParams(request => getMetricsSnapshot(request), "text/json"), conf)
)
}
def getMetricsSnapshot(request: HttpServletRequest): String = {
mapper.writeValueAsString(registry)
}
override def start(): Unit = { }
override def stop(): Unit = { }
override def report(): Unit = { }
}
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