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https://issues.apache.org/jira/browse/KNOX-2408?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on KNOX-2408 started by Sandor Molnar.
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> Improve AliasBasedTokenState service performance
> ------------------------------------------------
>
> Key: KNOX-2408
> URL: https://issues.apache.org/jira/browse/KNOX-2408
> Project: Apache Knox
> Issue Type: Task
> Components: Server
> Affects Versions: 1.4.0
> Reporter: Sandor Molnar
> Assignee: Sandor Molnar
> Priority: Major
> Fix For: 1.5.0
>
>
> While working on KNOX-2402 there were some performance issues related to
> {{AliasBasedTokenStateService}} which the new tool revealed during the test
> phase:
> {{AliasBasedTokenStateService}}:
> - {{updateExpiration()}} goes directly to alias service rather than updating
> it locally and let the background thread does its job
> - {{getTokens}} goes directly to alias service
> {{DefaultTokenStateService}}:
> - we should start using {{ConcurrentHashMap}} instead of {{HashMap}} for
> {{tokenExpirations}} and {{maxTokenLifetimes}} -> many of the synchronization
> blocks could be get rid of (CHM gives better performance anyway)
> - review {{getTokens()}} usage
> - eviction: needs to consider the case when Gateway was restarted -> nothing
> found in memory -> eviction is extremely slow
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