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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-2193) Re-architect Update Handler
Date Tue, 31 May 2011 17:57:48 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13041711#comment-13041711
] 

Michael McCandless commented on SOLR-2193:
------------------------------------------

I haven't looked that closely a this patch yet, but it already fixes a long standing problem
in Solr, that a long running merge blocks a Solr commit, because it switches to IW.commit
instead of closing/opening the writer.

This seems like a great step forward?

Sure, we should pursue moving IW to SolrCore, cutting over to IW's NRT's APIs, making all
caching per-segment, etc., but these should not block committing this improvement; they can
be pursued as followon/parallel issues: progress not perfection.

> Re-architect Update Handler
> ---------------------------
>
>                 Key: SOLR-2193
>                 URL: https://issues.apache.org/jira/browse/SOLR-2193
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Mark Miller
>             Fix For: 4.0
>
>         Attachments: SOLR-2193.patch, SOLR-2193.patch, SOLR-2193.patch, SOLR-2193.patch,
SOLR-2193.patch, SOLR-2193.patch
>
>
> The update handler needs an overhaul.
> A few goals I think we might want to look at:
> 1. Cleanup - drop DirectUpdateHandler(2) line - move to something like UpdateHandler,
DefaultUpdateHandler
> 2. Expose the SolrIndexWriter in the api or add the proper abstractions to get done what
we now do with special casing:
> if (directupdatehandler2)
>   success
>  else
>   failish
> 3. Stop closing the IndexWriter and start using commit (still lazy IW init though).
> 4. Drop iwAccess, iwCommit locks and sync mostly at the Lucene level.
> 5. Keep NRT support in mind.
> 6. Keep microsharding in mind (maintain logical index as multiple physical indexes)
> 7. Address the current issues we face because multiple original/'reloaded' cores can
have a different IndexWriter on the same index.

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