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

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KNOX-2408?focusedWorklogId=476544&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-476544 ]

ASF GitHub Bot logged work on KNOX-2408:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 31/Aug/20 11:47
            Start Date: 31/Aug/20 11:47
    Worklog Time Spent: 10m 
      Work Description: smolnar82 opened a new pull request #371:
URL: https://github.com/apache/knox/pull/371


   ## What changes were proposed in this pull request?
   
   - Let end-users customize the size/TTL attributes of the cache in `DefaultKeystoreService` I introduced while working on [KNOX-2136](https://issues.apache.org/jira/browse/KNOX-2136)
   - `AliasBasedTokenStateService.updateExpiration` updates the data in-memory and let the background thread does its job
   - if `AliasBasedTokenStateService` is selected as token state service, a new background thread is run when the service is started which reads previously persisted relevant aliases into the in-memory collections (in `DefaultTokenStateService`). With this change, it's not needed to override `getTokens` in `AliasBasedTokenStateService` which is only used by the reaper thread when evicting expired tokens. Instead, the token eviction logic will wait until everything is loaded.
   - `DefaultTokenStateService.tokenExpirations` and `DefaultTokenStateService.maxTokenLifetimes` became `ConcurrentHashMap`s -> get rid of many of the synchronization blocks -> easier to read and maintain the code and `CHM` performs better than synchronization + `HashMap`
   
   ## How was this patch tested?
   
   Updated and ran JUnit tests as well as executed the performance test tool multiple times to make sure I achieved the performance goals I was looking for with these changes.


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Issue Time Tracking
-------------------

            Worklog Id:     (was: 476544)
    Remaining Estimate: 0h
            Time Spent: 10m

> 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
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> 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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