/**
* @param sessionConfig session configuration
* @param numContainers number of containers to pre-warm
* @param localResources additional resources to pre-warm with
* @return prewarm context object
*/
public PreWarmContext createPreWarmContext(
TezSessionConfiguration sessionConfig,
int numContainers,
Map<String, LocalResource> localResources)
throws IOException, TezException {
Configuration conf = sessionConfig.getTezConfiguration();
ProcessorDescriptor prewarmProcDescriptor =
new ProcessorDescriptor(HivePreWarmProcessor.class.getName());
prewarmProcDescriptor.setUserPayload(MRHelpers.createUserPayloadFromConf(conf));
PreWarmContext context =
new PreWarmContext(
prewarmProcDescriptor,
getContainerResource(conf),
numContainers,
new VertexLocationHint(null));
Map<String, LocalResource> combinedResources = new HashMap<String, LocalResource>();
combinedResources.putAll(sessionConfig.getSessionResources());
if (localResources != null) {
combinedResources.putAll(localResources);
}
context.setLocalResources(combinedResources);
/* boiler plate task env */
Map<String, String> environment = new HashMap<String, String>();
MRHelpers.updateEnvironmentForMRTasks(conf, environment, true);
context.setEnvironment(environment);
context.setJavaOpts(getContainerJavaOpts(conf));
return context;
}