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From "Jinho Kim (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TAJO-387) Query is hanging when errors occurs in Query or SubQuery class
Date Fri, 06 Dec 2013 05:44:35 GMT

    [ https://issues.apache.org/jira/browse/TAJO-387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13841003#comment-13841003

Jinho Kim commented on TAJO-387:


Sorry, the patch worked well
This is a very desired feature for me. Ship it!

> Query is hanging when errors occurs in Query or SubQuery class
> --------------------------------------------------------------
>                 Key: TAJO-387
>                 URL: https://issues.apache.org/jira/browse/TAJO-387
>             Project: Tajo
>          Issue Type: Bug
>          Components: master
>            Reporter: Hyunsik Choi
>            Assignee: Hyunsik Choi
>            Priority: Critical
>             Fix For: 0.8-incubating
>         Attachments: TAJO-387.patch
> Currently, Query is hanging when errors occur in Query or SubQuery. This is a critical
> Primarily, this patch fixes many bugs that cause infinite query hanging. In detail, this
patch does as follows:
>  * When there is no result file, Query::buildOrUpdateResultTableDesc causes NPE. This
patch fixes this bug.
>  * A table can be either a file or directory. 
>   ** Before this patch, a table must be a directory.
>  * Add ERROR state to Query
>  * Allow Query to avoid hanging when errors occur
>  * Enable Query to accumulate diagnostic messages.
>  * Add ERROR state to SubQuery
>  * Allow SubQuery to avoid hanging and retrieve resources when errors occur
>  * Enable SubQuery to accumulate diagnostic messages.
>  * Enable TajoCli to get proper error messages (e.g., Query Failed! or Internal Error!)
when a query is failed or faces internal errors.

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