[jira] [Updated] (LUCENE-8068) Allow IndexWriter to write a single DWPT to disk

["Simon Willnauer (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-8068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Simon Willnauer updated LUCENE-8068:
------------------------------------
    Attachment: LUCENE-8068.patch

here is an initial patch

> Allow IndexWriter to write a single DWPT to disk
> ------------------------------------------------
>
>                 Key: LUCENE-8068
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8068
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Simon Willnauer
>             Fix For: master (8.0), 7.2
>
>         Attachments: LUCENE-8068.patch
>
>
> Today we IW can only flush a DWPT to disk if an external resource calls flush()  or refreshes a NRT reader or if a DWPT is selected as flush pending. Yet, the latter has the problem that it always ties up an indexing thread and if flush / NRT refresh is called a whole bunch of indexing threads is tied up. If IW could offer a simple `flushNextBuffer()` method that synchronously flushes the next pending or biggest active buffer to disk memory could be controlled in a more fine granular fashion from outside of the IW. This is for instance useful if more than one IW (shards) must be maintained in a single JVM / system. 



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