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From "Yonik Seeley (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-3146) Create migration guide from 3.x to 4.0
Date Mon, 20 Feb 2012 15:19:34 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13211918#comment-13211918
] 

Yonik Seeley commented on SOLR-3146:
------------------------------------

So I've thought about changing to soft commits by default too.  Here's the issue:
People use commit to make their recent updates visible (and a NRT softCommit would now be
most appropriate).
But commit also flushes all segments to disk and syncs them, and in a master-slave scenario
causes index changes to be replicable.

One possibility is to add a softCommit default of true to the normal update handlers.
People migrating an existing solrconfig wouldn't get that default, but new users (or users
starting from scratch with the new solrconfig would).

I don't know if it's worth it or not though.  Thoughts?
                
> Create migration guide from 3.x to 4.0
> --------------------------------------
>
>                 Key: SOLR-3146
>                 URL: https://issues.apache.org/jira/browse/SOLR-3146
>             Project: Solr
>          Issue Type: Task
>          Components: documentation
>            Reporter: Jan H√łydahl
>             Fix For: 4.0
>
>
> Spinoff from SOLR-3141:
> {quote}
> Perhaps an official migration guide on the CMS would be helpful too when 4.0 hits the
road. Such a guide would be more in-depth than the upgrading notes in CHANGES. We could have
a paragraph about optimize/forceMerge, and another paragraph about softCommit/commitWithin
as preferred to explicit commit, which is also a huge mistake many people do, they do over-committing!
> {quote}

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