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From Jihoon Son <ghoon...@gmail.com>
Subject Re: I have question with tajo query
Date Mon, 11 Nov 2013 10:36:50 GMT
Hi Jae Lee,
thanks for your interesting to Tajo.

Here are my answers.

1. The timeout message looks like an error, but it does not mean that the
query is failed. (We should change the message.)
Would you wait for some time after executing a query, please?
If any other errors occur, please report it to us.

2. Tajo's SQL commands are designed to follow those of traditional
relational databases.
In those systems, the 'DROP table' command deletes data from disks.
However, we are also considering the Hive-style 'DROP table', because
tables are generally very large.

3. Tajo currently does not provide any commands to kill executing queries.
Instead, you should kill the master and every worker using the unix 'kill'

If you have any other questions,
please feel free to ask us.


2013/11/11 Jae Lee <otooiland@gmail.com>

> Hello,
> :: I have error message and hang query with below.
> It's from clustered tajo worker.
> Centos 6.2 + hadoop 2.0.5 + tajo 0.2.0
> Just count(*) query is working but  use distinct or group by query had hang
> and this error messages
> :: have more question
> Tajo delete files on hdfs when i drop EXTERNAL table. is it normal?
> Because Hive is not delete files when drop external table.
> :: How to can i kill tajo jobs (query)?
> ---------------------------------------------------------------------
> 2013-11-11 18:44:22,751 WARN  worker.TaskRunner (TaskRunner.java:run(339))
> - Timeout
> GetTask:eb_1384155011466_0005_000001,container_1384155011466_0005_01_000013,
> but retry
> java.util.concurrent.TimeoutException
> at org.apache.tajo.rpc.CallFuture.get(CallFuture.java:81)
> at org.apache.tajo.worker.TaskRunner$1.run(TaskRunner.java:328)
>  at java.lang.Thread.run(Thread.java:744)
> Regards,
> Jae

Jihoon Son

Database & Information Systems Group,
Prof. Yon Dohn Chung Lab.
Dept. of Computer Science & Engineering,
Korea University
1, 5-ga, Anam-dong, Seongbuk-gu,
Seoul, 136-713, Republic of Korea

Tel : +82-2-3290-3580
E-mail : jihoonson@korea.ac.kr

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