[jira] [Resolved] (CARBONDATA-3919) Improve concurrent query performance

[Akash R Nilugal (Jira)]

     [ https://issues.apache.org/jira/browse/CARBONDATA-3919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Akash R Nilugal resolved CARBONDATA-3919.
-----------------------------------------
    Fix Version/s: 2.1.0
       Resolution: Fixed

> Improve concurrent query performance
> ------------------------------------
>
>                 Key: CARBONDATA-3919
>                 URL: https://issues.apache.org/jira/browse/CARBONDATA-3919
>             Project: CarbonData
>          Issue Type: Improvement
>            Reporter: Ajantha Bhat
>            Assignee: Ajantha Bhat
>            Priority: Major
>             Fix For: 2.1.0
>
>          Time Spent: 3.5h
>  Remaining Estimate: 0h
>
> problem1: when 500 queries executed concurrently. 
> checkIfRefreshIsNeeded method was synchronized. so only one thread was working at time.
> But actually synchronization is required only when schema modified to drop tables. Not for whole function
>  
> solution: synchronize only remove table part. Observed 500 query total performance improved from 10s to 3 seconds in cluster.
>  
> problem2:  
> TokenCache.obtainTokensForNamenodes was causing a performance bottleneck for concurrent queries. so, removed it
>  
>  

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