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Posted to dev@lucene.apache.org by "Simon Willnauer (JIRA)" <ji...@apache.org> on 2017/11/27 21:38:00 UTC

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

Simon Willnauer created LUCENE-8068:
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             Summary: 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


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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