Mongodb processes only one record at a time? - mongodb

Question

I am using Mongodb in .net core.
At the same time I have many applications that query the same table. I have the problem that 1 record is processed in many applications.
I used the version in mongo but it didn't work well.
Here is my code:
try
{
TopupRequest topupReturn = null;
do
{
var topupRequest = await _paygateMongoRepository.GetOneAsync<TopupRequest>(p =>
p.Status == TopupStatus.Init && categoryCodes.Contains(p.CategoryCode) &&
p.ServiceCode == serviceCode);
if (topupRequest == null)
break;
var version = topupRequest.Version;
var versionPlus = topupRequest.Version + 1;
Expression<Func<TopupRequest, bool>> filter = p => p.Id == topupRequest.Id && p.Version == version;
var options = new FindOneAndUpdateOptions<TopupRequest, TopupRequest>
{
IsUpsert = false,
ReturnDocument = ReturnDocument.After
};
_logger.Info("Version: " + version + " version plus: " + versionPlus);
topupReturn = await _paygateMongoRepository.GetAndUpdateOne<TopupRequest, Guid>(filter,
Builders<TopupRequest>.Update.Set(m => m.Status, TopupStatus.InProcessing)
.Set(m => m.Version, versionPlus)
.Set(m => m.WorkerApp, workerApp), options);
_logger.Info("Version: " + version + " version plus: " + versionPlus);
} while (topupReturn == null);
if (topupReturn == null) return null;
if (timeout > 0 && topupReturn.CreatedTime.AddSeconds(timeout) <= DateTime.UtcNow) return null;
_logger.Info($"GetTopupPriorityAvailableVersionAsync success: {topupReturn.ToJson()}");
return topupReturn.ConvertTo<TopupRequestDto>();
}
catch (Exception e)
{
_logger.Info($"GetTopupPriorityAvailableVersionAsync error: {e}");
return null;
}
I used a transaction solution. But it also doesn't work for me.
using (var session = MongoDbContext.Client.StartSession())
{
var topups = MongoDbContext.GetCollection<TopupRequest>();
try
{
session.StartTransaction(new TransactionOptions(
readConcern: ReadConcern.Local,
readPreference: ReadPreference.Primary,
writeConcern: WriteConcern.WMajority));
var sort = Builders<TopupRequest>.Sort.Descending("CreatedTime");
var filter = Builders<TopupRequest>.Filter.Eq(p => p.Status, TopupStatus.Init)
& Builders<TopupRequest>.Filter.In("CategoryCode", categoryCodes)
& Builders<TopupRequest>.Filter.Eq(p => p.ServiceCode, serviceCode);
var options = new FindOneAndUpdateOptions<TopupRequest, TopupRequest>
{
IsUpsert = false,
ReturnDocument = ReturnDocument.After,
Sort = sort
};
var update = Builders<TopupRequest>.Update.Set("Status", TopupStatus.InProcessing);
var result = await topups.FindOneAndUpdateAsync(session, filter, update,options);
if (result == null)
session.AbortTransaction();
session.CommitTransaction();
return result;
}
catch (Exception e)
{
session.AbortTransaction();
Console.WriteLine(e);
return null;
}
}
I still had the same problem at the same time 1 record was used many times.
Please help me