[ http://jira.codehaus.org/browse/GEOT-698?page=all ]
Jesse Eichar reopened GEOT-698:
-------------------------------
Assign To: Jesse Eichar (was: Jody Garnett)
Still some bugs I am fixing them. (I also had to modify transaction state diff)
> Deadlock during committing changes to shapefile
> -----------------------------------------------
>
> Key: GEOT-698
> URL: http://jira.codehaus.org/browse/GEOT-698
> Project: GeoTools
> Type: Bug
> Components: shapefile
> Versions: 2.2.M1, 2.1.1
> Reporter: Vitali Diatchkov
> Assignee: Jesse Eichar
> Priority: Critical
>
>
> Committing changes to shapefile (features are added or modified) leads to
> dead lock!
> The reason is two synchronized methods in TransactionStateDiff class from
> GeotTools API
> while one thread performs committing, another thread tries to render
> shapefile datasource.
> The following chain of events happens:
> 1) rendering thread gets ShapefileReader and locks Lock object from shapefile
> API in reading mode
> 2) committing thread tries to get lock for writing and waits in cycle in Lock
> object infinitly
> 3) call stack of committing thread goes through TransactionStateDiff.commit()
> method and locks that object for calling synchronized methods from other
> threads
> 4) rendering thread tries to get into TransactionStateDiff.diff() method but
> it is blocked until committing thread gets write access from Lock object.
> We get infinite rendering progress indicator inside of UDIG and infinite
> committing.
> Sometimes committing changes doesn't lock, but 95 % it locks (tested on
> different machines)
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