xkrogen commented on a change in pull request #30096:
URL: https://github.com/apache/spark/pull/30096#discussion_r517647854
##########
File path:
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala
##########
@@ -1577,6 +1618,19 @@ private object Client extends Logging {
writer.flush()
out.closeEntry()
}
+
+ private[yarn] def parseAppAttemptsJsonResponse(jsonString: String):
Option[(String, String)] = {
+ val objectMapper = new ObjectMapper()
+ // If JSON response is malformed somewhere along the way, MissingNode will
be returned,
+ // which allows for safe continuation of chaining. The `elements()` call
will be empty,
+ // and None will get returned.
+ objectMapper.readTree(jsonString)
+ .path("appAttempts").path("appAttempt")
+ .elements().asScala.toList.takeRight(1).headOption
+ .map(_.path("logsLink").asText(""))
+ .filterNot(_ == "")
+ .map(baseUrl => (s"$baseUrl/stdout?start=-4096",
s"$baseUrl/stderr?start=-4096"))
Review comment:
Nice, this is great! Thanks a lot for the pointer.
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