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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-1753) Allow means force a Repository to synchronize with the cluster
Date Thu, 09 Oct 2008 09:24:44 GMT

    [ https://issues.apache.org/jira/browse/JCR-1753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12638234#action_12638234

Jukka Zitting commented on JCR-1753:

I'm not sure that there will be that many syncs, especially if we don't trigger the sync from
Repository.login() calls. Additionally, if the node already is in sync with the cluster (which
would be the usual case), then the sync amounts to just retrieving the journal revision number
and comparing it with the local state.

If the retrieval of the journal revision number is expensive, we could add an additional local
guard that just ensures that at least one cluster sync has been done between a client calling
Session.refresh() (or Repository.login()) and the call returning. Whether it's that thread
or some other thread doing the sync doesn't matter. Something like this:

    private volatile int syncCount = 0;

    int count = syncCount;
    try {
        if (count == syncCount) {
    } finally {

> Allow means force a Repository to synchronize with the cluster
> --------------------------------------------------------------
>                 Key: JCR-1753
>                 URL: https://issues.apache.org/jira/browse/JCR-1753
>             Project: Jackrabbit
>          Issue Type: New Feature
>          Components: clustering, jackrabbit-api, jackrabbit-core
>            Reporter: Micah Whitacre
>            Assignee: Jukka Zitting
>         Attachments: JCR-1753.tar.gz
> Based on the thread on the user mailing list I'm logging this to propose adding a sync()
method to force cluster synchronization using the JackrabbitRepository extension API.
> The purpose of the method is such that in a distributed clustered environment sometime
cluster synchronization does or has not occurred such that certain repositories are in a stale
state.  This method would provide a means to force a repository to update pull in possible
changes made by other Jackrabbit repositories.

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