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https://issues.apache.org/jira/browse/TAJO-1340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14730576#comment-14730576
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ASF GitHub Bot commented on TAJO-1340:
--------------------------------------
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)
```
> Change the default output file format.
> --------------------------------------
>
> Key: TAJO-1340
> URL: https://issues.apache.org/jira/browse/TAJO-1340
> Project: Tajo
> Issue Type: Improvement
> Components: Java Client, JDBC Driver, Offheap, Storage
> Reporter: Hyunsik Choi
> Assignee: Jinho Kim
> Fix For: 0.11.0, 0.12.0
>
> Attachments: TAJO-1340.patch, TAJO-1340_2.patch
>
>
> Currently, the default output file is CSV. Due to its nature, CSV has mainly
> three problems:
> * Its line or field delimiter can be duplicated to some character included
> in the result data.
> * Plan text file is likely to be larger than other file formats.
> * Its read and write performance is slow.
> We need to change the default output file format into other file formats. We
> also need to investigate which file format is the best for it.
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