Program: 4915
Project: 4915
Buggy source:
@Override public void initialize() throws Exception {
  SparkClientContext context=getContext();
  String arguments=Joiner.on("String_Node_Str").withKeyValueSeparator("String_Node_Str").join(context.getRuntimeArguments());
  WRAPPERLOGGER.info("String_Node_Str",context.getApplicationSpecification().getName(),UserGroupInformation.getCurrentUser().getShortUserName(),arguments);
  DataStreamsPipelineSpec spec=GSON.fromJson(context.getSpecification().getProperty(Constants.PIPELINEID),DataStreamsPipelineSpec.class);
  int numSources=0;
  for (  StageSpec stageSpec : spec.getStages()) {
    if (StreamingSource.PLUGIN_TYPE.equals(stageSpec.getPlugin().getType())) {
      numSources++;
    }
  }
  SparkConf sparkConf=new SparkConf();
  sparkConf.set("String_Node_Str","String_Node_Str");
  for (  Map.Entry<String,String> property : spec.getProperties().entrySet()) {
    sparkConf.set(property.getKey(),property.getValue());
  }
  String extraOpts=spec.getExtraJavaOpts();
  if (extraOpts != null && !extraOpts.isEmpty()) {
    sparkConf.set("String_Node_Str",extraOpts);
    sparkConf.set("String_Node_Str",extraOpts);
  }
  sparkConf.set("String_Node_Str",String.valueOf(numSources + 2));
  if (spec.isUnitTest()) {
    sparkConf.setMaster(String.format("String_Node_Str",numSources + 1));
  }
  context.setSparkConf(sparkConf);
  if (!spec.isCheckpointsDisabled()) {
    FileSet checkpointFileSet=context.getDataset(DataStreamsApp.CHECKPOINT_FILESET);
    String pipelineName=context.getApplicationSpecification().getName();
    String checkpointDir=spec.getCheckpointDirectory();
    Location pipelineCheckpointBase=checkpointFileSet.getBaseLocation().append(pipelineName);
    Location pipelineCheckpointDir=pipelineCheckpointBase.append(checkpointDir);
    if (!ensureDirExists(pipelineCheckpointBase)) {
      throw new IOException(String.format("String_Node_Str",pipelineCheckpointBase));
    }
    try {
      for (      Location child : pipelineCheckpointBase.list()) {
        if (!child.equals(pipelineCheckpointDir) && !child.delete(true)) {
          LOG.warn("String_Node_Str",child);
        }
      }
    }
 catch (    Exception e) {
      LOG.warn("String_Node_Str",e);
    }
    if (!ensureDirExists(pipelineCheckpointDir)) {
      throw new IOException(String.format("String_Node_Str",pipelineCheckpointDir));
    }
  }
  WRAPPERLOGGER.info("String_Node_Str",context.getApplicationSpecification().getName());
}

Fixed version (ground truth):
@Override public void initialize() throws Exception {
  SparkClientContext context=getContext();
  String arguments=Joiner.on("String_Node_Str").withKeyValueSeparator("String_Node_Str").join(context.getRuntimeArguments());
  WRAPPERLOGGER.info("String_Node_Str",context.getApplicationSpecification().getName(),UserGroupInformation.getCurrentUser().getShortUserName(),arguments);
  DataStreamsPipelineSpec spec=GSON.fromJson(context.getSpecification().getProperty(Constants.PIPELINEID),DataStreamsPipelineSpec.class);
  PipelinePluginContext pluginContext=new SparkPipelinePluginContext(context,context.getMetrics(),true,true);
  int numSources=0;
  for (  StageSpec stageSpec : spec.getStages()) {
    if (StreamingSource.PLUGIN_TYPE.equals(stageSpec.getPlugin().getType())) {
      StreamingSource<Object> streamingSource=pluginContext.newPluginInstance(stageSpec.getName());
      numSources=numSources + streamingSource.getRequiredExecutors();
    }
  }
  SparkConf sparkConf=new SparkConf();
  sparkConf.set("String_Node_Str","String_Node_Str");
  for (  Map.Entry<String,String> property : spec.getProperties().entrySet()) {
    sparkConf.set(property.getKey(),property.getValue());
  }
  String extraOpts=spec.getExtraJavaOpts();
  if (extraOpts != null && !extraOpts.isEmpty()) {
    sparkConf.set("String_Node_Str",extraOpts);
    sparkConf.set("String_Node_Str",extraOpts);
  }
  sparkConf.set("String_Node_Str",String.valueOf(numSources + 2));
  sparkConf.set("String_Node_Str",String.valueOf(numSources + 2));
  sparkConf.setMaster(String.format("String_Node_Str",numSources + 2));
  if (spec.isUnitTest()) {
    sparkConf.setMaster(String.format("String_Node_Str",numSources + 1));
  }
  context.setSparkConf(sparkConf);
  if (!spec.isCheckpointsDisabled()) {
    FileSet checkpointFileSet=context.getDataset(DataStreamsApp.CHECKPOINT_FILESET);
    String pipelineName=context.getApplicationSpecification().getName();
    String checkpointDir=spec.getCheckpointDirectory();
    Location pipelineCheckpointBase=checkpointFileSet.getBaseLocation().append(pipelineName);
    Location pipelineCheckpointDir=pipelineCheckpointBase.append(checkpointDir);
    if (!ensureDirExists(pipelineCheckpointBase)) {
      throw new IOException(String.format("String_Node_Str",pipelineCheckpointBase));
    }
    try {
      for (      Location child : pipelineCheckpointBase.list()) {
        if (!child.equals(pipelineCheckpointDir) && !child.delete(true)) {
          LOG.warn("String_Node_Str",child);
        }
      }
    }
 catch (    Exception e) {
      LOG.warn("String_Node_Str",e);
    }
    if (!ensureDirExists(pipelineCheckpointDir)) {
      throw new IOException(String.format("String_Node_Str",pipelineCheckpointDir));
    }
  }
  WRAPPERLOGGER.info("String_Node_Str",context.getApplicationSpecification().getName());
}