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Posted to common-dev@hadoop.apache.org by "Bharat Viswanadham (Jira)" <ji...@apache.org> on 2021/09/30 00:27:01 UTC

[jira] [Resolved] (HADOOP-17905) Modify Text.ensureCapacity() to efficiently max out the backing array size

     [ https://issues.apache.org/jira/browse/HADOOP-17905?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bharat Viswanadham resolved HADOOP-17905.
-----------------------------------------
    Fix Version/s: 3.3.2
       Resolution: Fixed

> Modify Text.ensureCapacity() to efficiently max out the backing array size
> --------------------------------------------------------------------------
>
>                 Key: HADOOP-17905
>                 URL: https://issues.apache.org/jira/browse/HADOOP-17905
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Peter Bacsko
>            Assignee: Peter Bacsko
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 3.3.2
>
>          Time Spent: 3h 50m
>  Remaining Estimate: 0h
>
> This is a continuation of HADOOP-17901.
> Right now we use a factor of 1.5x to increase the byte array if it's full. However, if the size reaches a certain point, the increment is only (current size + length). This can cause performance issues if the textual data which we intend to store is beyond this point.
> Instead, let's max out the array to the maximum. Based on different sources, a safe choice seems to be Integer.MAX_VALUE - 8 (see ArrayList, AbstractCollection, HashTable, etc).



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