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https://issues.apache.org/jira/browse/TAJO-527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14344430#comment-14344430
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ASF GitHub Bot commented on TAJO-527:
-------------------------------------
Github user jinossy commented on the pull request:
https://github.com/apache/tajo/pull/311#issuecomment-76879983
I’ve successfully tested by real data on my company cluster.
* ENV
* 2 TajoMaster + 4 TajoWorker
* JDK 1.7.0_67
* 1G Network
```
Json Table
2TB compressed by snappy
7.3TB Actual bytes
select count(*) from (select id from table1 group by id) t1;
Progress: 100%, response time: 3546.781 sec
?count
-------------------------------
2802809536
(1 rows, 3546.781 sec, 11 B selected)
Parquet table
8.1TB compressed by snappy
select count(*) from table2
Progress: 100%, response time: 374.358 sec
?count
-------------------------------
16090817643
(1 rows, 374.358 sec, 12 B selected)
```
> Upgrade to Netty 4
> ------------------
>
> Key: TAJO-527
> URL: https://issues.apache.org/jira/browse/TAJO-527
> Project: Tajo
> Issue Type: Improvement
> Components: rpc
> Reporter: Hyunsik Choi
> Assignee: Jihun Kang
>
> Currently, rpc package uses Netty 3. Netty 4 is more stable and will get
> significant performance benefits. We need to upgrade Netty version to 4.
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