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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (JCR-1813) Invalid journal records during XATransactions
Date Sat, 18 Oct 2008 23:58:44 GMT

     [ https://issues.apache.org/jira/browse/JCR-1813?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jukka Zitting resolved JCR-1813.
--------------------------------

       Resolution: Fixed
    Fix Version/s: 1.5.0
         Assignee: Jukka Zitting

Resolved in revision 705938. Thanks for the good report and proposed fix!

I added the ChangeLog.hasUpdates() method as proposed, but used it already in XAItemStateManager
instead of SharedItemStateManager to avoid as much extra processing as possible.

> Invalid journal records during XATransactions
> ---------------------------------------------
>
>                 Key: JCR-1813
>                 URL: https://issues.apache.org/jira/browse/JCR-1813
>             Project: Jackrabbit
>          Issue Type: Bug
>          Components: clustering, jackrabbit-core
>            Reporter: Stephane Landelle
>            Assignee: Jukka Zitting
>            Priority: Critical
>             Fix For: 1.5.0
>
>
> During the prepare phase of a XATransaction, XAItemStateManager.prepare calls ShareItemStageManager.beginUpdate
that, in case of a ClusterNode, calls ClusterNode.updatePrepared that does a ChangeLogRecord.write().
> This last method is located in ClusterRecord and systematically write the begin and the
end of the journal record.
> As a consequence, useless corrupted records are written in the journal everytime a transaction
ends without jackrabbit update! This causes polution of the journal, as other cluster nodes
try to sync with the corrupted updates and fail doing so as ClusterRecordDeserializer can't
deserialize it (the record identifier is empty).
> ChangeLogRecord (and even other ClusterRecord implementations too) should only write
if there's effective updates.
> I propose the following solution:
> *) add the following method in Changelog so clients can know if there's effective updates:
>     public boolean hasUpdates() {
>     	return !(addedStates.isEmpty() && modifiedStates.isEmpty() && deletedStates.isEmpty()
&& modifiedRefs.isEmpty());
>     }
> *) change ClusterRecord with:
>     public final void write() throws JournalException {
>     	
>     	if (hasUpdates()) {
> 	        record.writeString(workspace);
> 	        doWrite();
> 	        record.writeChar(END_MARKER);
>     	}
>     }
>     
>     protected abstract boolean hasUpdates();
> *) implement hasUpdates for every ClusterRecord implementation:
>  ----> ChangeLogRecord:
>     protected boolean hasUpdates() {
>     	return changes.hasUpdates() || !events.isEmpty();
>     }
>  ----> LockRecord and NamespaceRecord:
>     protected boolean hasUpdates() {
>     	return true;
>     }
>  ----> NodeTypeRecord:
>     protected boolean hasUpdates() {
>     	return !collection.isEmpty();
>     }
> Best regards,
> Stephane Landelle

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