Fixed performance degradation if recovering with big numbers of snaps… #3138
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Danthar
reviewed
Oct 3, 2017
| @@ -273,7 +273,8 @@ protected AbstractQueryExecutor(QueryConfiguration configuration, Akka.Serializa | |||
| WHERE {Configuration.PersistenceIdColumnName} = @PersistenceId | |||
| AND {Configuration.SequenceNrColumnName} <= @SequenceNr | |||
| AND {Configuration.TimestampColumnName} <= @Timestamp | |||
| ORDER BY {Configuration.SequenceNrColumnName} DESC"; | |||
| ORDER BY {Configuration.SequenceNrColumnName} DESC | |||
| LIMIT 1"; | |||
Danthar
reviewed
Oct 3, 2017
| @@ -110,9 +110,10 @@ protected override void PostStop() | |||
| try | |||
| { | |||
| using (var connection = CreateDbConnection()) | |||
| using (var nestedCancellationTokenSource = CancellationTokenSource.CreateLinkedTokenSource(_pendingRequestsCancellation.Token)) | |||
| { | |||
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Good solution on using CreateLinkedTokenSource
Aaronontheweb
approved these changes
Oct 3, 2017
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The reason for this degradation is SQL-driver rows pre-fetch. Furthermore, the current implementation of SelectSnapshotAsync reads only one row, so there is no reason to query more than one snapshot row.