spark ResourceDiscoveryScriptPlugin 源码
spark ResourceDiscoveryScriptPlugin 代码
文件路径：/core/src/main/scala/org/apache/spark/resource/ResourceDiscoveryScriptPlugin.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.resource
import java.io.File
import java.util.Optional
import org.apache.spark.{SparkConf, SparkException}
import org.apache.spark.annotation.DeveloperApi
import org.apache.spark.api.resource.ResourceDiscoveryPlugin
import org.apache.spark.internal.Logging
import org.apache.spark.util.Utils.executeAndGetOutput
/**
* The default plugin that is loaded into a Spark application to control how custom
* resources are discovered. This executes the discovery script specified by the user
* and gets the json output back and constructs ResourceInformation objects from that.
* If the user specifies custom plugins, this is the last one to be executed and
* throws if the resource isn't discovered.
*
* @since 3.0.0
*/
@DeveloperApi
class ResourceDiscoveryScriptPlugin extends ResourceDiscoveryPlugin with Logging {
override def discoverResource(
request: ResourceRequest,
sparkConf: SparkConf): Optional[ResourceInformation] = {
val script = request.discoveryScript
val resourceName = request.id.resourceName
val result = if (script.isPresent) {
val scriptFile = new File(script.get)
logInfo(s"Discovering resources for $resourceName with script: $scriptFile")
// check that script exists and try to execute
if (scriptFile.exists()) {
val output = executeAndGetOutput(Seq(script.get), new File("."))
ResourceInformation.parseJson(output)
} else {
throw new SparkException(s"Resource script: $scriptFile to discover $resourceName " +
"doesn't exist!")
}
} else {
throw new SparkException(s"User is expecting to use resource: $resourceName, but " +
"didn't specify a discovery script!")
}
if (!result.name.equals(resourceName)) {
throw new SparkException(s"Error running the resource discovery script ${script.get}: " +
s"script returned resource name ${result.name} and we were expecting $resourceName.")
}
Optional.of(result)
}
}
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