[jira] [Resolved] (SOLR-4764) When using NRT, just init the reader from IndexWriter

["Robert Muir (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-4764?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robert Muir resolved SOLR-4764.
-------------------------------

       Resolution: Fixed
    Fix Version/s: 5.0
                   4.5

Thanks for reviewing Mark!
                
> When using NRT, just init the reader from IndexWriter
> -----------------------------------------------------
>
>                 Key: SOLR-4764
>                 URL: https://issues.apache.org/jira/browse/SOLR-4764
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Robert Muir
>             Fix For: 4.5, 5.0
>
>         Attachments: SOLR-4764.patch, SOLR-4764_test.patch
>
>
> Spinoff from SOLR-4761
> Solr first opens a DirectoryReader from the directory, then later will pass this to IW openIfChanged.
> I noticed this when i was confused that mergedsegmentwarmer doesn't appear to work at first until after you've reopened...
> I'm not totally sure what the current behavior causes (does IW's pool reuse segments from this passed-in "external" reader, or is this causing some horrible doubling-up/inefficient stuff etc?). To some extent i think we should change it even if its actually performant: I think its confusing.
> I think ideally we'd change IndexReaderFactory's method to take writer instead of directory so that custom DirectoryReaders can still work.

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