[jira] [Created] (KNOX-2408) Improve AliasBasedTokenState service performance

["Sandor Molnar (Jira)" <ji...@apache.org>]

Sandor Molnar created KNOX-2408:
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             Summary: 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
             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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