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https://issues.apache.org/jira/browse/SOLR-2193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13041261#comment-13041261
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Mark Miller commented on SOLR-2193:
-----------------------------------
Reporting the current state regarding original goals:
bq. 1. Cleanup - drop DirectUpdateHandler(2) line - move to something like
UpdateHandler, DefaultUpdateHandler
I want to do this, but it's just easier to handle after the first commit.
{quote} 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 {quote}
There is no need for this anymore.
bq. 3. Stop closing the IndexWriter and start using commit (still lazy IW init
though).
This is done.
bq. 4. Drop iwAccess, iwCommit locks and sync mostly at the Lucene level.
This is done.
bq. 5. Keep NRT support in mind.
Always ;) This patch certainly won't complete the NRT work needed, but it's a
large start, and a huge step forward for Solr. Much of what is left to do is in
this area though.
bq. 6. Keep microsharding in mind (maintain logical index as multiple physical
indexes)
Have not really addressed anything here - don't think I hurt anything either
though. Worth considering the new IndexWriterProvider and how it might relate
to this though.
{quote}7. Address the current issues we face because multiple
original/'reloaded' cores can have a different IndexWriter on the same
index.{quote}
I've made an attempt at this with the IndexWriterProvider and some simple ref
counting that could use a once over. This changes how you should reload a
Solrcore - rather than just opening a new one and closing the old one, you want
to call a method on the SolrCore itself and get the new SolrCore.
More to come. I've updated the patch to trunk as well - will attach shortly.
> Re-architect Update Handler
> ---------------------------
>
> Key: SOLR-2193
> URL: https://issues.apache.org/jira/browse/SOLR-2193
> Project: Solr
> Issue Type: Improvement
> Reporter: Mark Miller
> Assignee: Mark Miller
> Fix For: 4.0
>
> Attachments: 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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