Github user yaojiefeng commented on a diff in the pull request:
https://github.com/apache/twill/pull/53#discussion_r109552373
--- Diff:
twill-yarn/src/main/java/org/apache/twill/yarn/YarnTwillController.java ---
@@ -322,7 +314,46 @@ private boolean hasRun(YarnApplicationState state) {
@Override
public ResourceReport getResourceReport() {
- // in case the user calls this before starting, return null
+ // Only has resource report if the app is running.
+ if (state() != State.RUNNING) {
+ return null;
+ }
+ ResourceReportClient resourcesClient = getResourcesClient();
return (resourcesClient == null) ? null : resourcesClient.get();
}
+
+ /**
+ * Returns the {@link ResourceReportClient} for fetching resource report
from the AM.
+ * It first consults the RM for the tracking URL and get the resource
report from there.
+ */
+ @Nullable
+ private ResourceReportClient getResourcesClient() {
+ YarnApplicationReport report = processController.getReport();
+ List<URL> urls = new ArrayList<>(2);
--- End diff --
Why will this url list has initial capacity of 2?
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