[TAJO-387] Query is hanging when errors occurs in Query or SubQuery class

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: 0.8.0
• Component/s: QueryMaster
• Assignee: Hyunsik Choi
• Reporter: Hyunsik Choi
• Created: 05/Dec/13 15:26
• Updated: 06/Dec/13 12:27
• Resolved: 06/Dec/13 07:30

Description

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.