Harsh J created YARN-555: ---------------------------- Summary: ContainerLaunchContext is buggy when it comes to setter methods on a new instance Key: YARN-555 URL: https://issues.apache.org/jira/browse/YARN-555 Project: Hadoop YARN Issue Type: Bug Components: api Affects Versions: 2.0.3-alpha Reporter: Harsh J Priority: Minor
If you look at the API of ContainerLaunchContext, its got setter methods, such as for setResource, setCommands, etc…: http://hadoop.apache.org/docs/current/api/org/apache/hadoop/yarn/api/records/ContainerLaunchContext.html#setCommands(java.util.List) However, there's certain things broken in its use here that am trying to understand. Let me explain with some code context: 1. I initialize a proper CLC for an ApplicationSubmissionContext (appContext). {code} ContainerLaunchContext appMasterLaunchContext = Records.newRecord(ContainerLaunchContext.class); appContext.setAMContainerSpec(appMasterLaunchContext); {code} 2. I create a resource request of 130 MB, as applicationMasterResource, and try to set it into the CLC via: {code} appContext.getAMContainerSpec().setResource(applicationMasterResource); {code} 3. This works OK. If I query it back now, it returns 130 for a {{getMemory()}} call. 4. So I attempt to do the same with setCommands/setEnvironment/etc., all of which fail to mutate cause the check in CLC's implementation class disregards whatever I try to set. This is cause of these null checks which keep passing: {code} // ContainerLaunchContextPBImpl.java @Override public void setCommands(final List<String> commands) { if (commands == null) return; initCommands(); this.commands.clear(); this.commands.addAll(commands); } {code} This is rather non intuitive as a check. If I am to set something, setting it should take place. If it is null, do not return but instead set whats provided? I'm not even sure why that null check exists - it seems to do so from the start of time. However, {{setResource(…)}} works pretty fine, as the call has no such odd check: {code} @Override public void setResource(Resource resource) { maybeInitBuilder(); if (resource == null) builder.clearResource(); this.resource = resource; } {code} -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira