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https://issues.apache.org/jira/browse/LOG4NET-531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15650727#comment-15650727
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Joe commented on LOG4NET-531:
-----------------------------
[~lanorkin] from the stack trace I would say there is am unhandled exception on
a thread created by your custom appender. And you say you have already fixed
it (probably by adding a try/catch, or by setting IsBackground=true for the
thread your custom appender started so it doesn't prevent the process from
terminating).
Why do you think the same problem exists in the standard AdoNetAppender? The
standard AdoNetAppender logs synchronously, and I would have thought any
exception it throws would be caught by log4net internally.
> AdoNetAppender crashes application if BeginDbTransaction failed
> ---------------------------------------------------------------
>
> Key: LOG4NET-531
> URL: https://issues.apache.org/jira/browse/LOG4NET-531
> Project: Log4net
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 1.2.15
> Environment: Windows Server 2012 R2 Datacenter, SQL Azure, Windows
> Service
> Reporter: Vladimir Vedeneev
> Priority: Critical
>
> AdoNetAppender crashed the process due to failed BeginDbTransaction:
> {noformat}
> Framework Version: v4.0.30319
> Description: The process was terminated due to an unhandled exception.
> Exception Info: System.Data.SqlClient.SqlException
> at
> System.Data.SqlClient.SqlConnection.OnError(System.Data.SqlClient.SqlException,
> Boolean, System.Action`1<System.Action>)
> at
> System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(System.Data.SqlClient.TdsParserStateObject,
> Boolean, Boolean)
> at
> System.Data.SqlClient.TdsParserStateObject.SNIWritePacket(System.Data.SqlClient.SNIHandle,
> System.Data.SqlClient.SNIPacket, UInt32 ByRef, Boolean, Boolean)
> at System.Data.SqlClient.TdsParserStateObject.WriteSni(Boolean)
> at System.Data.SqlClient.TdsParserStateObject.WritePacket(Byte, Boolean)
> at
> System.Data.SqlClient.TdsParser.TdsExecuteTransactionManagerRequest(Byte[],
> TransactionManagerRequestType, System.String,
> TransactionManagerIsolationLevel, Int32,
> System.Data.SqlClient.SqlInternalTransaction,
> System.Data.SqlClient.TdsParserStateObject, Boolean)
> at
> System.Data.SqlClient.SqlInternalConnectionTds.ExecuteTransactionYukon(TransactionRequest,
> System.String, System.Data.IsolationLevel,
> System.Data.SqlClient.SqlInternalTransaction, Boolean)
> at
> System.Data.SqlClient.SqlInternalConnection.BeginSqlTransaction(System.Data.IsolationLevel,
> System.String, Boolean)
> at
> System.Data.SqlClient.SqlConnection.BeginTransaction(System.Data.IsolationLevel,
> System.String)
> at
> System.Data.SqlClient.SqlConnection.BeginDbTransaction(System.Data.IsolationLevel)
> at log4net.Appender.AdoNetAppender.SendBuffer(log4net.Core.LoggingEvent[])
> at
> log4net.Appender.BufferingAppenderSkeleton.Append(log4net.Core.LoggingEvent)
> at <custom appender inherited from AdoNetAppender>
> at
> System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext,
> System.Threading.ContextCallback, System.Object, Boolean)
> at
> System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext,
> System.Threading.ContextCallback, System.Object, Boolean)
> at
> System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext,
> System.Threading.ContextCallback, System.Object)
> at System.Threading.ThreadHelper.ThreadStart()
> {noformat}
> I believe AdoNetAppender will crash in the same way, but we use it a bit
> customized.
> We have custom appender inherited from AdoNetAppender, which runs in separate
> thread and uses Queue to accumulate log events, so that database logging
> works asynchronously. It uses "base.Append(..)" to log events from queue. We
> use SQL Azure as database, which as cloud solution is not 100% available.
> In rare cases appender crashes the app domain on "BeginDbTransaction" line,
> as it is not covered with try / catch block.
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