Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2257#discussion_r71322624
--- Diff:
flink-yarn/src/main/java/org/apache/flink/yarn/YarnFlinkResourceManager.java ---
@@ -78,6 +79,9 @@
/** The containers where a TaskManager is starting and we are waiting
for it to register */
private final Map<ResourceID, YarnContainerInLaunch> containersInLaunch;
+ /** The container where a TaskManager has been started and is running
in */
+ private final Map<ResourceID, Container> containersLaunched;
--- End diff --
It is true that it holds the registered resources but it does not hold the
launched containers. When a `JobManager` loses its leadership the list of
registered workers will be cleared. In order to reconstruct the mapping
`ResourceID --> Container`, you need this new map.
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