Github user chtyim commented on a diff in the pull request: https://github.com/apache/twill/pull/6#discussion_r76685965 --- Diff: twill-yarn/src/main/hadoop20/org/apache/twill/internal/yarn/Hadoop20YarnAppClient.java --- @@ -176,22 +184,27 @@ private void addRMToken(ContainerLaunchContext context) { @Override public ProcessController<YarnApplicationReport> createProcessController(ApplicationId appId) { - return new ProcessControllerImpl(yarnClient, appId); + return new ProcessControllerImpl(createYarnClient(), appId); } @Override public List<NodeReport> getNodeReports() throws Exception { - return this.yarnClient.getNodeReports(); + YarnClient yarnClient = createYarnClient(); + try { + return yarnClient.getNodeReports(); + } finally { + yarnClient.stop(); + } } @Override protected void startUp() throws Exception { - yarnClient.start(); + // no-op. We will create and start YarnClients, on demand --- End diff -- Maybe we should make `YarnAppClient` not a `Service` at all. It seems like there is no need for any lifecycle management.
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