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Fix HighestSequenceNr MongoDb query by sorting. #267

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Jul 1, 2022
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Fix HighestSequenceNr MongoDb query by sorting. #267

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6 changes: 5 additions & 1 deletion src/Akka.Persistence.MongoDb/Journal/MongoDbJournal.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -227,7 +227,11 @@ public override async Task<long> ReadHighestSequenceNrAsync(string persistenceId

var metadataHighestSequenceNrTask = _metadataCollection.Value.Find(filter).Project(x => x.SequenceNr).FirstOrDefaultAsync();

var journalHighestSequenceNrTask = _journalCollection.Value.Find(Builders<JournalEntry>.Filter.Eq(x => x.PersistenceId, persistenceId)).Project(x => x.SequenceNr).FirstOrDefaultAsync();
var journalHighestSequenceNrTask = _journalCollection.Value.Find(Builders<JournalEntry>
.Filter.Eq(x => x.PersistenceId, persistenceId))
.SortByDescending(x => x.SequenceNr)
.Project(x => x.SequenceNr)
.FirstOrDefaultAsync();

// journal data is usually good enough, except in cases when it's been deleted.
await Task.WhenAll(metadataHighestSequenceNrTask, journalHighestSequenceNrTask);
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