Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/20474#discussion_r166409473 --- Diff: core/src/main/scala/org/apache/spark/status/api/v1/OneApplicationResource.scala --- @@ -51,6 +51,31 @@ private[v1] class AbstractApplicationResource extends BaseAppResource { @Path("executors") def executorList(): Seq[ExecutorSummary] = withUI(_.store.executorList(true)) + @GET + @Path("executors/{executorId}/threads") + def threadDump(@PathParam("executorId") executorId: String): Response = withUI { ui => + def isAllDigits(x: String) = x.forall(Character.isDigit) + + if (executorId != SparkContext.DRIVER_IDENTIFIER && !isAllDigits(executorId)) { + throw new BadParameterException( + s"Invalid executorId: neither '${SparkContext.DRIVER_IDENTIFIER}' nor number.") + } + + val safeSparkContext = ui.sc.getOrElse { + throw new ServiceUnavailable("Thread dumps not available through the history server.") + } + + ui.store.asOption(ui.store.executorSummary(executorId)) match { + case Some(executorSummary) if executorSummary.isActive => + val safeThreadDump = safeSparkContext.getExecutorThreadDump(executorId).getOrElse { + throw new NotFoundException("No thread dump is available.") + } + return Response.ok(safeThreadDump).build() + case Some(_) => throw new BadParameterException("Executor is already dead.") --- End diff -- nit: "Executor is not active."
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