Github user jinossy commented on the pull request:
https://github.com/apache/tajo/pull/430#issuecomment-97008145
If you set an error message in controller, Async {{CallFuture.get()}} can
throw exception.
like this example :
```
@Override
public void done(RpcController controller,
TajoWorkerProtocol.TaskCompletionReport report,
RpcCallback<PrimitiveProtos.BoolProto> done) {
try {
QueryMasterTask queryMasterTask = queryMaster.getQueryMasterTask(
new
QueryId(report.getId().getTaskId().getExecutionBlockId().getQueryId()));
if (queryMasterTask != null) {
queryMasterTask.getEventHandler().handle(new
TaskCompletionEvent(report));
}
done.run(TajoWorker.TRUE_PROTO);
} catch (Exception e) {
LOG.error(e.getMessage(), e);
controller.setFailed(e.getMessage());
done.run(TajoWorker.FALSE_PROTO);
}
}
```
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