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https://issues.apache.org/jira/browse/KYLIN-2894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16667044#comment-16667044
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ASF subversion and git services commented on KYLIN-2894:
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Commit 95afdb44e52be0d1e24c2487745906dbd35da8fc in kylin's branch
refs/heads/master from Zhong
[ https://gitbox.apache.org/repos/asf?p=kylin.git;h=95afdb4 ]
KYLIN-2894 add unit test
> Change the query cache expiration strategy by signature checking
> ----------------------------------------------------------------
>
> Key: KYLIN-2894
> URL: https://issues.apache.org/jira/browse/KYLIN-2894
> Project: Kylin
> Issue Type: Sub-task
> Components: Query Engine
> Reporter: Zhong Yanghong
> Assignee: Wang Ken
> Priority: Major
>
> Currently to invalid query cache, {{CacheService}} will either invoke
> {{cleanDataCache}} or {{cleanAllDataCache}}. Both methods will clear all of
> the query cache, which is very inefficient. In eBay PROD environment, there's
> around 400 cubing jobs per day, which means the query cache will be cleared
> very 4 minutes. Then we introduced a signature based cache invalidation
> strategy. The basic idea is as follows:
> * Add a signature for {{SQLResponse}}, here we choose the cube last build time
> * When fetch {{SQLResponse}} for cache, first check whether the signature is
> consistent. If not, this cached value is overdue and will be invalidate.
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