Github user tillrohrmann commented on a diff in the pull request: https://github.com/apache/flink/pull/4729#discussion_r143959669 --- Diff: flink-yarn/src/main/java/org/apache/flink/yarn/YarnResourceManager.java --- @@ -227,13 +241,19 @@ public void startNewWorker(ResourceProfile resourceProfile) { } @Override - public void stopWorker(ResourceID resourceID) { - // TODO: Implement to stop the worker + public void stopWorker(YarnWorkerNode workerNode) { + workerNodeMap.remove(workerNode.getResourceID().toString()); --- End diff -- I might have already asked you this, but looking at the code, I think we initialize the `ResourceID` on the `TaskManager` with `ContainerId.toString`. Can't we use this to reconstruct the `ContainerId` similar to http://hadoop.apache.org/docs/r2.8.0/api/org/apache/hadoop/yarn/api/records/ContainerId.html#fromString(java.lang.String)?
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