Metadata store replica is already in use!!!

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  You mentioned you are first detecting the changes.

  In this step, if you have opened a SqlMetastore instance, Please check whether you have called Dispose() for it later.

   

  Friday, June 13, 2008 8:39 PM

  Answerer
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  I've also had the Metadata store replica is already in use error.  My problem was that i wasn't using a cleanup function at the start of the sync (or end).  Whenever files are synced a Metadata file and File Id are created and then synced between source and destination.  In order to sync again those 2 files must be deleted.  So the very first sync will work fine but all other syncs won't unless the existing Metadata and File Id files are deleted.  Hope this helps!
  

  Monday, August 18, 2008 6:04 AM
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  Thanks for your suggestion, in fact I too solved this problem exactly what you have suggested. But If we have to delete and recreate the meta data file every time then what's the benefit in it. On the successive run it agains checks for the differences and eventually takes more time, which it could have saved using the existing meta-data file.

   

  I am not sure whether its a bug or in appropriate coding on ourselves but I tested for the same with Sync Toy 2.0 (Beta) and there its working fine. Still wonder why the MS samples are able to bypass such situations!!!

   

  Neway, Let me know if you came across any better solution.

   

  Thanks,

  Nilesh

  Monday, August 18, 2008 4:14 PM
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  Hi Nilesh -

   

  You are right - deleting and recreating the store file on each sync has no benefit to your sync. You do not have to do this. The error basically indicates that the metadata file is open and you have already accessed the replica which has NOT been closed. Everytime you are done using the metadata file you need to call Dispose() on it when you are done to ensure that the store file is closed.

   

  Thanks

  Deepa

  Thursday, August 21, 2008 7:39 PM

  Answerer
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  Thanks Deepa,

   

  Actually I am calling the dispose method on the sync provider objects. But I think its not closing the metadata file. Metadata file is created and managed by this provider in its definition, I am not creating my own inherited class to perform the operations. Following is what I am doing.

   

   

  Code Snippet

  FileSyncProvider sourceReplica = null;
   FileSyncProvider destReplica = null;

   try
   {
    sourceReplica = new FileSyncProvider(Guid.NewGuid(), source, fileFilter, FileSyncOptions.CompareFileStreams,
                                          metadataDirectorySource, metadataFileSource,
                                          tempDirectorySource, conflictLoserDirectorySource);
                  destReplica = new FileSyncProvider(Guid.NewGuid(), dest, fileFilter, FileSyncOptions.CompareFileStreams,
                                          metadataDirectoryDest, metadataFileDest,
                                          tempDirectoryDest, conflictLoserDirectoryDest);

                  sourceReplica.DetectChanges();

                  destReplica.DetectChanges();

             //Apply the change
             syncAgent = new SyncOrchestrator();
             syncAgent.LocalProvider = sourceReplica;
             syncAgent.RemoteProvider = destReplica;               
             syncAgent.Direction = SyncDirectionOrder.Upload;

   

   //Exception raised here.

             syncAgent.Synchronize();

   }
   catch(Exception ex)
   {
    //Exception handling
   }
   finally
   {

              if (File.Exists(Path.Combine(metadataDirectorySource, metadataFileSource)))
                  File.Delete(Path.Combine(metadataDirectorySource, metadataFileSource));

  
                  if (File.Exists(Path.Combine(metadataDirectoryDest, metadataFileDest)))
                      File.Delete(Path.Combine(metadataDirectoryDest, metadataFileDest));

   

                  if (sourceReplica != null)
                      sourceReplica.Dispose();

                  if (destReplica != null)
                      destReplica.Dispose();
   }

   

   

   

  Once I call the dispose method of the FileSyncProvider it should release the metada file also. Also when I delete the metadata file its not raising any File Access Exception like, File is in use can not delete. If the metadata file is in use then how come its getting deleted?

   

  Any help would be greatly appreciated.

   

  Thanks,

  Nilesh

  Friday, August 22, 2008 2:58 PM
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  My code is very similar to yours.  The Dispose method is very curious.  My question has been if the Dispose method is suppossed to release the metadata file, why is there a cleanup function in the Sync101 sample specifically to delete the metadata file?  The Sync101 sample is where I got the idea to delete the metadata file after synchronization.
  

  Saturday, August 23, 2008 4:03 AM
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  Can you change your code like this and let me know if this works?

  {

  FileSyncProvider sourceReplica = null;
  FileSyncProvider destReplica = null;

                  sourceReplica = new FileSyncProvider(Guid.NewGuid(), source, fileFilter, FileSyncOptions.CompareFileStreams,
                                          metadataDirectorySource, metadataFileSource,
                                          tempDirectorySource, conflictLoserDirectorySource);
                  destReplica = new FileSyncProvider(Guid.NewGuid(), dest, fileFilter, FileSyncOptions.CompareFileStreams,
                                          metadataDirectoryDest, metadataFileDest,
                                          tempDirectoryDest, conflictLoserDirectoryDest);

                  try

                  {

                        sourceReplica.DetectChanges();

                        destReplica.DetectChanges();

                  }

                  finally

                  {

                         if(sourceReplica != null) { sourceReplica.Dispose(); sourceReplica = null; }

                         if(destReplica != null) {destReplica.Dispose(); destReplica = null; }

                  }

   

                  sourceReplica = new FileSyncProvider(Guid.NewGuid(), source, fileFilter,                                  FileSyncOptions.CompareFileStreams,
                                          metadataDirectorySource, metadataFileSource,
                                          tempDirectorySource, conflictLoserDirectorySource);
                  destReplica = new FileSyncProvider(Guid.NewGuid(), dest, fileFilter, FileSyncOptions.CompareFileStreams,
                                          metadataDirectoryDest, metadataFileDest,
                                          tempDirectoryDest, conflictLoserDirectoryDest);

                      try

                       {

                   //Apply the change
                   syncAgent = new SyncOrchestrator();
                   syncAgent.LocalProvider = sourceReplica;
                   syncAgent.RemoteProvider = destReplica;               
                    syncAgent.Direction = SyncDirectionOrder.Upload;

   

   //Exception raised here.

                     syncAgent.Synchronize();

                       }
                     catch(Exception ex)
                      {
                             //Exception handling
                      }
                      finally
                      {

                               // NB: I am leaving this in here because it works for sample/test code that you want to clean up after

                               // you are done. But in REAL code that you right to keep two folders in sync - this is incorrect - you

                               // should not delete the metadata file at the end of each sync.

                               if (File.Exists(Path.Combine(metadataDirectorySource, metadataFileSource)))
                                     File.Delete(Path.Combine(metadataDirectorySource, metadataFileSource));

  
                              if (File.Exists(Path.Combine(metadataDirectoryDest, metadataFileDest)))
                                      File.Delete(Path.Combine(metadataDirectoryDest, metadataFileDest));

   

                              if (sourceReplica != null)
                                        sourceReplica.Dispose();

                              if (destReplica != null)
                                        destReplica.Dispose();
                      }

  }

  Tuesday, August 26, 2008 5:45 PM

  Answerer
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  Answering very specifically the question about why the file was deleted in the sample - we did that just to start the sample afresh each time and we can start with a clean state everytime. Any real-world provider needs to keep metadata state between sync's so that incremental sync's take place correctly everytime.

   

  Thanks

  Deepa

   

  • Proposed as answer by Patrick S. Lee Wednesday, February 18, 2009 12:31 AM
  • Marked as answer by Liam Cavanagh - MSFTMicrosoft employee Friday, March 6, 2009 6:03 PM

  Tuesday, August 26, 2008 5:49 PM

  Answerer