Hyoungjun Kim created TAJO-1026:
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Summary: Implement Query history persistency manager.
Key: TAJO-1026
URL: https://issues.apache.org/jira/browse/TAJO-1026
Project: Tajo
Issue Type: New Feature
Reporter: Hyoungjun Kim
Assignee: Hyoungjun Kim
Priority: Minor
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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