[jira] [Resolved] (LUCENE-6849) Add IndexWriter API to write segment(s) without refreshing them

["Michael McCandless (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-6849?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless resolved LUCENE-6849.
----------------------------------------
    Resolution: Fixed

> Add IndexWriter API to write segment(s) without refreshing them
> ---------------------------------------------------------------
>
>                 Key: LUCENE-6849
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6849
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: Trunk, 5.4
>
>         Attachments: LUCENE-6849.patch
>
>
> Today, the only way to have {{IndexWriter}} free up some heap is to invoke refresh or flush or close it, but these are all quite costly, and do much more than simply "move bytes to disk".
> I think we should add a simple API, e.g. "move the biggest in-memory segment to disk" to 1) give more granularity (there could be multiple in-memory segments), and 2) only move bytes to disk (not refresh, not fsync, etc.).
> This way apps that want to be more careful on how heap is used can have more control.



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