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https://issues.apache.org/jira/browse/SPARK-45527?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Graves reassigned SPARK-45527:
-------------------------------------
Assignee: Bobby Wang
> Task fraction resource request is not expected
> ----------------------------------------------
>
> Key: SPARK-45527
> URL: https://issues.apache.org/jira/browse/SPARK-45527
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 3.2.1, 3.3.3, 3.4.1, 3.5.0
> Reporter: wuyi
> Assignee: Bobby Wang
> Priority: Major
> Labels: pull-request-available
>
>
> {code:java}
> test("SPARK-XXX") {
> import org.apache.spark.resource.{ResourceProfileBuilder,
> TaskResourceRequests}
> withTempDir { dir =>
> val scriptPath = createTempScriptWithExpectedOutput(dir,
> "gpuDiscoveryScript",
> """{"name": "gpu","addresses":["0"]}""")
> val conf = new SparkConf()
> .setAppName("test")
> .setMaster("local-cluster[1, 12, 1024]")
> .set("spark.executor.cores", "12")
> conf.set(TASK_GPU_ID.amountConf, "0.08")
> conf.set(WORKER_GPU_ID.amountConf, "1")
> conf.set(WORKER_GPU_ID.discoveryScriptConf, scriptPath)
> conf.set(EXECUTOR_GPU_ID.amountConf, "1")
> sc = new SparkContext(conf)
> val rdd = sc.range(0, 100, 1, 4)
> var rdd1 = rdd.repartition(3)
> val treqs = new TaskResourceRequests().cpus(1).resource("gpu", 1.0)
> val rp = new ResourceProfileBuilder().require(treqs).build
> rdd1 = rdd1.withResources(rp)
> assert(rdd1.collect().size === 100)
> }
> } {code}
> In the above test, the 3 tasks generated by rdd1 are expected to be executed
> in sequence as we expect "new TaskResourceRequests().cpus(1).resource("gpu",
> 1.0)" should override "conf.set(TASK_GPU_ID.amountConf, "0.08")". However,
> those 3 tasks are run in parallel in fact.
> The root cause is that ExecutorData#ExecutorResourceInfo#numParts is static.
> In this case, the "gpu.numParts" is initialized with 12 (1/0.08) and won't
> change even if there's a new task resource request (e.g., resource("gpu",
> 1.0) in this case). Thus, those 3 tasks are able to be executed in parallel.
>
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