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From "Erick Erickson (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LUCENE-8398) TieredMergePolicy.getMaxMergedSegmentMB has rounding error
Date Mon, 16 Jul 2018 00:30:00 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-8398?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Erick Erickson updated LUCENE-8398:
-----------------------------------
    Attachment: LUCENE-8398.patch

> TieredMergePolicy.getMaxMergedSegmentMB has rounding error
> ----------------------------------------------------------
>
>                 Key: LUCENE-8398
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8398
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/other
>            Reporter: Erick Erickson
>            Assignee: Erick Erickson
>            Priority: Minor
>         Attachments: LUCENE-8398.patch
>
>
> This is largely a test artifact since it's unlikely to show up for realistically sized
segments, but the fix is simple and safe.
> This code first does long division then promotes to double for the last calculation.
> {code}
>  return maxMergedSegmentBytes/1024/1024.;
> {code}
> The error can be reproduced with:  -Dtests.seed=EF80BCABAD74A7CF



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