[jira] [Created] (TAJO-387) Query is hanging when errors occurs in Query or SubQuery

["Hyunsik Choi (JIRA)" <ji...@apache.org>]

Hyunsik Choi created TAJO-387:
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             Summary: Query is hanging when errors occurs in Query or SubQuery
                 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


Currently, Query is hanging when errors occur in Query or SubQuery. This is a critical bug.

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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