Github user jinossy commented on the pull request:
https://github.com/apache/tajo/pull/671#issuecomment-137692374
I've add async fetch.
Here is some benchmark
```
//Query: select * from lineitem
TajoMaster: text + TajoClient: async-fetch
81 sec (Deserialize), 76 sec (Non-Deserialize)
TajoMaster: text compress + TajoClient: async-fetch , decompress
75 sec (Deserialize), 76 sec (Non-Deserialize)
//Query: select * from lineitem where 1=1
TajoMaster: draw + TajoClient: async-fetch
35 sec (Deserialize), 25 sec (Non-Deserialize)
TajoMaster: draw, compress + TajoClient: async-fetch, decompress
53 sec (Deserialize), 51 sec (Non-Deserialize)
```
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