Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/423#issuecomment-88344313
As @jinossy said, it would be better if this feature is enabled only in
unit tests by default. ```TajoTestingCluster::initPropertiesAndConfigs()```
looks good to enable it for unit tests. Additionally, you also should increase
```WORKER_RESOURCE_AVAILABLE_MEMORY_MB``` because only a single task can be
executed with a query master due to the small size of the default available
memory (1024 MB). Please note that a query master and a task use 512 MB by
default, respectively.
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