Pooling clears current active connections
-----------------------------------------
Key: DNET-607
URL: http://tracker.firebirdsql.org/browse/DNET-607
Project: .NET Data provider
Issue Type: Bug
Components: ADO.NET Provider
Affects Versions: 4.6.2.0
Environment: Windows 8
Visual Studio Pro 2013
Firebird 2.5.2
Reporter: Simon Carter
Assignee: Jiri Cincura
The following method within FbConnectionPoolManager.cs
public void CleanupPool()
{
lock (_syncRoot)
{
CheckDisposedImpl();
var now = DateTimeOffset.UtcNow;
var available = _available.ToArray();
var keep = available.Where(x =>
IsAlive(_connectionString.ConnectionLifeTime, x.Created, now)).ToArray();
var keepCount = keep.Count();
if (keepCount < _connectionString.MinPoolSize)
keep =
available.Except(keep).Take(_connectionString.MinPoolSize -
keepCount).ToArray();
var release = available.Except(keep).ToArray();
release.AsParallel().ForAll(x => x.Dispose());
_available = new Queue<Item>(keep);
}
}
}
The line keep = available.Except(keep).Take(_connectionString.MinPoolSize -
keepCount).ToArray(); will always clear existing connections when the number of
connections is less than the Minimum Pool Size.
By removing the following lines, all works as expected:
var keepCount = keep.Count();
if (keepCount < _connectionString.MinPoolSize)
keep =
available.Except(keep).Take(_connectionString.MinPoolSize -
keepCount).ToArray();
Also the Take(_connectionString.MinPoolSize - keepCount) only takes account of
the min pool size and not the maximum, so "other" connections above min pool
size could also be lost at this point
The following is my connection string:
User=USERNAME;Password=password;Database=DBName.fdb;DataSource=127.0.0.1;Dialect=3;MinPoolSize=20;MaxPoolSize=150;Pooling=True;Connection
lifetime=0;Packet Size=8192;CharSet=UTF8
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