[jira] [Resolved] (CARBONDATA-3481) Multi-thread pruning fails when datamaps count is just near numOfThreadsForPruning

[Akash R Nilugal (Jira)]

     [ https://issues.apache.org/jira/browse/CARBONDATA-3481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kunal Kapoor resolved CARBONDATA-3481.
--------------------------------------
       Resolution: Fixed
    Fix Version/s: 1.6.0

> Multi-thread pruning fails when datamaps count is just near numOfThreadsForPruning
> ----------------------------------------------------------------------------------
>
>                 Key: CARBONDATA-3481
>                 URL: https://issues.apache.org/jira/browse/CARBONDATA-3481
>             Project: CarbonData
>          Issue Type: Bug
>            Reporter: Ajantha Bhat
>            Priority: Minor
>             Fix For: 1.6.0
>
>          Time Spent: 8h 10m
>  Remaining Estimate: 0h
>
> Problem : Multi-thread pruning fails when datamaps count is just near numOfThreadsForPruning.
> Cause : When the datamaps count is just near numOfThreadsForPruning,
> As code is checking '>= ', last thread may not get the datamaps for prune. Hence array out of index exception is thrown in this scenario.
> There is no issues with higher number of datamaps.
> solution: In this scenario launch threads based on the distribution value, not on the hardcoded value
>  
> steps to reproduce:
> 5 index files with total 0.32 million data file (each has 50k, 120k, 50k, 60k, 50k each)
> with default thread count as 4, array of bound index is observed for below line.
> final List<SegmentDataMapGroup> segmentDataMapGroups = datamapListForEachThread.get(i);

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