[jira] [Resolved] (TAJO-1026) Implement Query history persistency manager.

["Hyoungjun Kim (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TAJO-1026?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyoungjun Kim resolved TAJO-1026.
---------------------------------
    Resolution: Fixed

> Implement Query history persistency manager.
> --------------------------------------------
>
>                 Key: TAJO-1026
>                 URL: https://issues.apache.org/jira/browse/TAJO-1026
>             Project: Tajo
>          Issue Type: New Feature
>          Components: query master, tajo master
>            Reporter: Hyoungjun Kim
>            Assignee: Hyoungjun Kim
>            Priority: Minor
>             Fix For: 0.9.1
>
>
> Currently query history stored in the memory of TajoMaster or QueryMaster. Query detail information is disappeared when the cluster is restarted. And because of memory limitations, only a few hours or a few days histories are kept.
> I suggest the following features for the query history.
> - Worker saves a query task history to the HDFS after finishing a query.
> - QueryMaster saves a query history to the HDFS after finishing a query.
> - If query is finished, Information Web server in TajoMaster shows query history in the web page, If query is running  TajoMaster forward to QueryMaster.
> - History data will be saved to HDFS with JSON format.
> - JSON format has history file version for backward compatibility.



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