Keuntae Park created TAJO-275:
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Summary: Separating QueryMaster and TaskRunner roles in worker
Key: TAJO-275
URL: https://issues.apache.org/jira/browse/TAJO-275
Project: Tajo
Issue Type: Improvement
Reporter: Keuntae Park
In C++ implementation of Tajo worker,
I think it is better to maintain Java code of QueryMaster and implement only
TaskRunner as C++ code, rather than implementing both QueryMaster and
TaskRunner as C++ code.
Accordingly, standby mode worker will have following 3 modes:
1) TaskRunner + QueryMaster (current implementation)
2) TaskRunner only (C++)
3) QueryMaster only (java)
As a result, most workers work as C++ TaskRunner, and 1 or 2 workers work as
separate QueryMasters (java process).
For backward compatibility, default mode should be mode 1 (TaskRunner +
QueryMaster)
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