Consider enabling transient error resiliency by adding 'EnableRetryOnFailure()' to the 'UseMySql' call

0

I have an application based on F#, and I use EF-Core and MySQL (Pomelo.EntityFrameworkCore.MySql). I have an async method which updates data in DB(MySql)

let updatePlayerAchievementsAsync (logger:ILogger) (ctx:ReportCacheDbContext) (id: int) = async {
  let! account = ctx.AccountCaches.FirstOrDefaultAsync(fun e -> e.AccountId = id) |> Async.AwaitTask
  if account <> null then
    account.State <- "Closed"
    do! ctx.SaveChangesAsync true |> Async.AwaitTask |> Async.Ignore
    logger.LogInformation("Account{0} updated", id)        
}

when this method comes to the 99th element, the following errors occurred:

|ERROR|System.InvalidOperationException:An exception has been raised that is likely due to a transient failure. Consider enabling transient error resiliency by adding 'EnableRetryOnFailure()' to the 'UseMySql' call. 
---> MySql.Data.MySqlClient.MySqlException (0x80004005): Connect Timeout expired. All pooled connections are in use.

I tried to follow 1st error's recomendation and tried to add EnableRetryOnFailure()

member this.ConfigureServices(services: IServiceCollection) =
    services.AddOptions() |> ignore
    services.AddCors() |> ignore
    
    services
        .AddDbContext<ApplicationDbContext>(
            fun (service:IServiceProvider) (dbContext:DbContextOptionsBuilder) ->
                dbContext.UseMySql(profile.DbConnectionToAdmin /*HERE*/)|> ignore)
    ...

And I can't find any documentation about this adding options for F# & MySQL, cause all found info written on C#. Maybe problem in used pools (default max=100) and I wrote next:

...
do! ctx.SaveChangesAsync true |> Async.AwaitTask |> Async.Ignore
ctx.Database.CloseConnection()
logger.LogInformation("Account{0} updated", id)  

But anyway problem wasn't solved. This is my new experience in F# and async and I cant understand what I did incorrectly. Could anyone help me in such problem? Thanks a lot!

mysql
entity-framework
asynchronous
async-await
f#
asked on Stack Overflow Jul 8, 2020 by N.Ayaz • edited Jul 8, 2020 by Robert Harvey

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