apache/tajo — pull request #179 by babokim (2014-10-05 06:56:33+00:00)
Title: TAJO-1026: Implement Query history persistency manager.

Query history has the three types of files.
- Query list file: saving the list of query(default store is hdfs), hourly rolling, stored by TajoMaster.

`//query-list/query-list-.hist`

- Query detail file: saving the query plan and execution block summary(default store is hdfs), single file per query or execution block, stored by QueryMaster.

`//query-detail//query.hist`

`//query-detail//.hist`

- Task detail file: saving the task history(default is local), stored by Worker.

`//tasks/_/___.hist`

And I added page navigation in query.jsp and querytasks.jsp