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From "Mark Miller (JIRA)" <>
Subject [jira] [Commented] (SOLR-2565) Prevent IW#close and cut over to IW#commit
Date Tue, 09 Aug 2011 22:13:27 GMT


Mark Miller commented on SOLR-2565:

+1 - makes sense, looks right.

Without the patch, your stress test fails for me on my new linux box in 6-12 seconds regularly.
With the patch I just ran it for half an hour.

> Prevent IW#close and cut over to IW#commit
> ------------------------------------------
>                 Key: SOLR-2565
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>          Components: update
>    Affects Versions: 4.0
>            Reporter: Simon Willnauer
>            Assignee: Mark Miller
>             Fix For: 4.0
>         Attachments: SOLR-2565.patch, SOLR-2565.patch
> Spinnoff from SOLR-2193. We already have a branch to work on this issue here

> The main goal here is to prevent solr from closing the IW and use IW#commit instead.
AFAIK the main issues here are:
> The update handler needs an overhaul.
> A few goals I think we might want to look at:
> 1. Expose the SolrIndexWriter in the api or add the proper abstractions to get done what
we now do with special casing:
> 2. Stop closing the IndexWriter and start using commit (still lazy IW init though).
> 3. Drop iwAccess, iwCommit locks and sync mostly at the Lucene level.
> 4. Address the current issues we face because multiple original/'reloaded' cores can
have a different IndexWriter on the same index.
> Eventually this is a preparation for NRT support in Solr which I will create a followup
issue for.

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