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Posted to dev@jackrabbit.apache.org by "Marcel Reutegger (JIRA)" <ji...@apache.org> on 2013/03/21 10:07:15 UTC
[jira] [Commented] (JCR-3537) Large number of SQL queries when
adding nodes with version history
[ https://issues.apache.org/jira/browse/JCR-3537?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13608774#comment-13608774 ]
Marcel Reutegger commented on JCR-3537:
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The versioning behavior is defined by the node type. E.g. see the definition for nt:folder: http://wiki.apache.org/jackrabbit/nt%3Afolder
It says to create a version the child nodes when the parent is versioned. Maybe this is what happens in your case and is therefore expected?
> Large number of SQL queries when adding nodes with version history
> ------------------------------------------------------------------
>
> Key: JCR-3537
> URL: https://issues.apache.org/jira/browse/JCR-3537
> Project: Jackrabbit Content Repository
> Issue Type: Bug
> Components: versioning
> Affects Versions: 2.5
> Environment: Windows 2008, tomcat application server, SQL Server 2008 database server
> Reporter: Todd Pagni
> Labels: newbie, patch
> Attachments: jackrabbit-core-2.5.0-version-history.patch
>
>
> We are adding a large number of documents to a jackrabbit 2.5 database repository. We are using the bundle.MSSqlPersistenceManager and we are seeing a large number of SQL queries (300+) when adding a single folder, file, and file content. This appears to create a significant performance bottleneck when adding documents when the repository size is over 300k documents/nodes. The repository structure is a hierarchy with less than 1000k child nodes per parent. The following is an example structure of the repo with the (New child folder) representing the new content being added.
> -- Root node
> -- Parent node
> --New child folder (mix:versionable,mix:lockable)
> --new file (mix:versionable,mix:lockable)
> --new document content
> --Existing Child Folder
> -- Parent node
> The vast majority of the 200-300+ queries that execute when adding a node look like the following:
> exec sp_execute 2,0x5740D9A36F2E4032BFF0BA652D89FFB8
> exec sp_execute 2,0xBBFE059BF7E44947A8B0858F3CE33DB8
> exec sp_execute 2,0xC2AD22DBE1DB43A083BCA1B2C94E07CC
> The majority of the queries that are executed appear to be related to versioning. When a node is added the version history for the node stored/saved, the parent node is saved, which ultimately cascades and saves all children of the parent, so adding a child node saves the parent and all other children.
> We have created a patch for jackrabbit-core 2.5.0 to prevent the cascade to store all other child nodes when saving/storing the version history of a new node. This cuts the number of queries that are executed in half. Does anyone see a problem with this technique? All unit tests are still passing.
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