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https://issues.apache.org/jira/browse/OAK-3924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15121663#comment-15121663
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Tomek Rękawek commented on OAK-3924:
------------------------------------
Attached small patches. The only dependency is between 04-sort-documents and
05-handle-batch-update-exception.
I don't think the sort-documents affects Mongo - the only change is in the
internal {{RDBDocumentStoreJDBC.update()}}, not in the public
{{RDBDocumentStore.createOrUpdate()}}.
> Fix database-level row deadlock during bulk updates in RDB
> ----------------------------------------------------------
>
> Key: OAK-3924
> URL: https://issues.apache.org/jira/browse/OAK-3924
> Project: Jackrabbit Oak
> Issue Type: Sub-task
> Components: rdbmk
> Reporter: Tomek Rękawek
> Priority: Critical
> Fix For: 1.4
>
> Attachments: OAK-3924-01-disable-property.patch,
> OAK-3924-02-concurrent-tests.patch, OAK-3924-03-autocommit.patch,
> OAK-3924-04-sort-documents.patch,
> OAK-3924-05-handle-batch-update-exception.patch, OAK-3924.patch
>
>
> It seems that the new bulk createOrUpdate() implementation in RDB is prone
> for the deadlocks. It isn't a bug in the Oak code, but rather something
> related to the database implementations. The bug can be observed if we have
> multiple simultaneous bulk updates and some of the rows repeat among them.
> The attached patch contains an unit test {{testConcurrentWithConflict}}
> presenting the issue.
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