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https://issues.apache.org/jira/browse/KYLIN-4358?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17029490#comment-17029490
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nichunen commented on KYLIN-4358:
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@Moran Hi, the PR is fine to me. Thanks for your contribution.
> statement cache eviction invalidation base on time
> --------------------------------------------------
>
> Key: KYLIN-4358
> URL: https://issues.apache.org/jira/browse/KYLIN-4358
> Project: Kylin
> Issue Type: Improvement
> Components: Query Engine
> Affects Versions: v2.6.0, v2.6.1, v3.0.0, v2.6.2, v2.6.3, v2.6.4
> Reporter: Moran
> Priority: Major
> Fix For: v3.1.0
>
>
> I found that the query node JVM memory usage is getting higher and higher.
> After JMat investigation, most of them are statement cache, but the statement
> cache will be eliminated after 10 minutes according to the eviction policy.
> Multiple experiments found that the eviction did not take effect due to the
> missing timeBetweenEvictionRunsMillis parameter. The following are the
> relevant parts of the [GenericObjectPool user
> manual|[https://commons.apache.org/proper/commons-pool/api-1.6/org/apache/commons/pool/impl/GenericObjectPool.html]]
> {code:java}
> timeBetweenEvictionRunsMillis indicates how long the eviction thread should
> sleep before "runs" of examining idle objects. When non-positive, no eviction
> thread will be launched. The default setting for this parameter is -1 (i.e.,
> idle object eviction is disabled by default).
> minEvictableIdleTimeMillis specifies the minimum amount of time that an
> object may sit idle in the pool before it is eligible for eviction due to
> idle time. When non-positive, no object will be dropped from the pool due to
> idle time alone. This setting has no effect unless
> timeBetweenEvictionRunsMillis > 0. The default setting for this parameter is
> 30 minutes.
> {code}
>
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