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Posted to oak-issues@jackrabbit.apache.org by "Mete Atamel (JIRA)" <ji...@apache.org> on 2013/01/28 11:39:12 UTC

[jira] [Updated] (OAK-585) Reduce cost of commit retry

     [ https://issues.apache.org/jira/browse/OAK-585?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mete Atamel updated OAK-585:
----------------------------

    Attachment: OAK-585-1.patch

This is what I have in mind for #1.
                
> Reduce cost of commit retry
> ---------------------------
>
>                 Key: OAK-585
>                 URL: https://issues.apache.org/jira/browse/OAK-585
>             Project: Jackrabbit Oak
>          Issue Type: Improvement
>          Components: mongomk
>    Affects Versions: 0.6
>            Reporter: Marcel Reutegger
>         Attachments: OAK-585-1.patch
>
>
> MongoMK currently has a retry mechanism when it commits changes. Its main purpose is to make sure the headRevId in the sync collection is updated consistently and concurrent conflicting commits are detected. Under higher concurrency it may happen that commits are retried multiple times, even when commits are non-conflicting. In this case its only about consistently updating the headRevId. When this happens the commit will get a new revision and the nodes of the commit are written again with the new revision, even though no changes to the nodes are needed. Only the revision needed an update.
> The cost of a retry should be reduced in this case. At least a commit retry should not leave garbage in the nodes and commits collections.

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