Dayue Gao created KYLIN-2847:
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Summary: avoid doing useless work by checking query deadline
Key: KYLIN-2847
URL: https://issues.apache.org/jira/browse/KYLIN-2847
Project: Kylin
Issue Type: Improvement
Components: Query Engine, Storage - HBase
Affects Versions: v2.1.0
Reporter: Dayue Gao
Assignee: Dayue Gao
Under high load, requests can spend a long time waiting in RPC queue, probably
longer than query timeout. However, current coprocessor timeout mechanism
doesn't take RPC queue time into account. As a result, handling these requests
not only waste server resources while doing nothing useful, but can also cause
cascading failure when server crashes and client retries.
To recover from server overload ASAP, we should check query deadline at each
stages of query processing, and avoid spending resources on query that will
exceed their deadline.
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