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https://issues.apache.org/jira/browse/LUCENE-8699?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ignacio Vera resolved LUCENE-8699.
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       Resolution: Fixed
         Assignee: Ignacio Vera
    Fix Version/s: master (9.0)
                   8.x

> Use fixed byte array in HeapPointWriter
> ---------------------------------------
>
>                 Key: LUCENE-8699
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8699
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Ignacio Vera
>            Assignee: Ignacio Vera
>            Priority: Major
>             Fix For: 8.x, master (9.0)
>
>          Time Spent: 2h
>  Remaining Estimate: 0h
>
>  
> {heapPointWriter} is always created with the same init size and max size. It 
> might make sense to change the implementation to use a byte array instead of 
> a growable structure as it has now. This seems to improve performance:
>  
> ||Approach||Index time (sec): Dev||Index Time (sec): Base||Index Time: 
> Diff||Force merge time (sec): Dev||Force Merge time (sec): Base||Force Merge 
> Time: Diff||Index size (GB): Dev||Index size (GB): Base||Index Size: 
> Diff||Reader heap (MB): Dev||Reader heap (MB): Base||Reader heap: Diff||
> |points|122.1s|147.0s|-17%|51.9s|70.5s|-26%|0.55|0.55|0%|1.57|1.57|0%|
> |shapes|211.1s|244.6s|-14%|121.1s|135.0s|-10%|1.29|1.29|0%|1.61|1.61|0%|
> |geo3d|154.2s|186.6s|-17%|63.4s|82.8s|-23%|0.75|0.75|0%|1.58|1.58|0%|



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