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Posted to dev@lucene.apache.org by "Per Steffensen (Commented) (JIRA)" <ji...@apache.org> on 2012/03/09 21:54:57 UTC
[jira] [Commented] (SOLR-3178) Versioning - optimistic locking
[ https://issues.apache.org/jira/browse/SOLR-3178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13226443#comment-13226443 ]
Per Steffensen commented on SOLR-3178:
--------------------------------------
More detailed descriptions of the added features in SOLR-3173 and SOLR-3178 here: http://wiki.apache.org/solr/Per%20Steffensen/Update%20semantics
> Versioning - optimistic locking
> -------------------------------
>
> Key: SOLR-3178
> URL: https://issues.apache.org/jira/browse/SOLR-3178
> Project: Solr
> Issue Type: New Feature
> Components: update
> Affects Versions: 3.5
> Environment: All
> Reporter: Per Steffensen
> Assignee: Per Steffensen
> Labels: RDBMS, insert, locking, nosql, optimistic, uniqueKey, update, versioning
> Fix For: 4.0
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> In order increase the ability of Solr to be used as a NoSql database (lots of concurrent inserts, updates, deletes and queries in the entire lifetime of the index) instead of just a search index (first: everything indexed (in one thread), after: only queries), I would like Solr to support versioning to be used for optimistic locking.
> When my intent (see SOLR-3173) is to update an existing document, I will need to provide a version-number equal to "the version number I got when I fetched the existing document for update" plus one. If this provided version-number does not correspond to "the newest version-number of that document at the time of update" plus one, I will get a VersionConflict error. If it does correspond the document will be updated with the new one, so that "the newest version-number of that document" is NOW one higher than before the update. Correct but efficient concurrency handling.
> When my intent (see SOLR-3173) is to insert a new document, the version number provided will not be used - instead a version-number 0 will be used. According to SOLR-3173 insert will only succeed if a document with the same value on uniqueKey-field does not already exist.
> In general when talking about different versions of "the same document", of course we need to be able to identify when a document "is the same" - that, per definition, is when the values of the uniqueKey-fields are equal.
> The functionality provided by this issue is only really meaningfull when you run with "updateLog" activated.
> This issue might be solved more or less at the same time as SOLR-3173, and only one single SVN patch might be given to cover both issues.
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