[
https://issues.apache.org/jira/browse/KYLIN-2847?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Shaofeng SHI updated KYLIN-2847:
--------------------------------
Affects Version/s: (was: v2.1.0)
Fix Version/s: v2.3.0
Summary: Avoid doing useless work by checking query deadline
(was: avoid doing useless work by checking query deadline)
Merged in master, thanks Dayue!
> 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
> Reporter: Dayue Gao
> Assignee: Dayue Gao
> Labels: scope
> Fix For: v2.3.0
>
> Attachments: KYLIN-2847-v2.patch, KYLIN-2847.patch
>
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
