I'm using Dapper to connect to a MySQL database for data queries. The project runs fine locally, but when I deploy it to AWS EKS, the service starts up normally. However, when I start making requests to the service's gRPC interface for data queries, I get a NullReferenceException on the first request to the same interface, but subsequent requests are fine.
When I wait for a longer period of time and then make a request to the same interface again, I occasionally get the NullReferenceException again.
At first, I suspected that it was an issue with the connection pool initialization, so I tried the following methods, but they didn't work:
using (var conn = GetConnection())
{
conn.Open();
conn.Close();
}
The exception log is below:
System.NullReferenceException: Object reference not set to an instance of an object.
at MySql.Data.MySqlClient.MySqlCommand.ExecuteReaderAsync(CommandBehavior behavior, Boolean execAsync, CancellationToken cancellationToken)
at MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQueryAsync(Boolean execAsync, CancellationToken cancellationToken)
at Dapper.SqlMapper.ExecuteMultiImplAsync(IDbConnection cnn, CommandDefinition command, IEnumerable multiExec) in /_/Dapper/SqlMapper.Async.cs:line 640
System.NullReferenceException: Object reference not set to an instance of an object.
at MySql.Data.MySqlClient.MySqlCommand.ExecuteReaderAsync(CommandBehavior behavior, Boolean execAsync, CancellationToken cancellationToken)
at MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQueryAsync(Boolean execAsync, CancellationToken cancellationToken)
at Dapper.SqlMapper.ExecuteImplAsync(IDbConnection cnn, CommandDefinition command, Object param) in /_/Dapper/SqlMapper.Async.cs:line 662
at Dapper.DapperExtensions.ExecuteAsync(IDbConnection conn, ExCommand[] cmdJoined) in /src/TradingApp.Data/Extensions/Dapper/DapperExtensions.cs:line 75
I'm using Dapper to connect to a MySQL database for data queries. The project runs fine locally, but when I deploy it to AWS EKS, the service starts up normally. However, when I start making requests to the service's gRPC interface for data queries, I get a NullReferenceException on the first request to the same interface, but subsequent requests are fine. When I wait for a longer period of time and then make a request to the same interface again, I occasionally get the NullReferenceException again.
Here are some information of env: Mysql: 8.0.35
connectionString: Server=xxx;port=3306;user=xx;password=xxx;database=xxx;CharSet=utf8mb4;pooling=true;
At first, I suspected that it was an issue with the connection pool initialization, so I tried the following methods, but they didn't work:
The exception log is below:
Any suggestion here?