我正在尝试为NLog编写一个自定义异步目标,将日志推送到Azure,并遇到意外情况。基本上这样:当我调用的异步任务很慢时(在本例中为1.5s),在第一批之后,所有剩余的日志条目都是单批发送的。
这可以使用TaskDelayMilliseconds的各种值以及各种应用程序延迟进行重现。除了异常/重试之外,我希望每个“TaskDelayMilliseconds”都有一个“写”操作。我怀疑这可能是AsyncTaskTarget中的一个错误,但在提交之前我想要一个社区评论。有什么想法吗?提前致谢。
此代码需要NLog Nuget 4.6.0-rc3。当前版本中不提供要重写的新异步批处理方法。
[Target("AsyncTestTarget")]
public class AsyncTestTarget : AsyncTaskTarget
{
protected override void InitializeTarget()
{
base.InitializeTarget();
BatchSize = 10000;
TaskDelayMilliseconds = 3000;
}
protected override Task WriteAsyncTask(LogEventInfo logEvent, CancellationToken cancellationToken)
{
InternalLogger.Info($"NLog.Extensions.AsyncTestTarget.WriteAsyncTask()");
return WriteAsyncTask(new List<LogEventInfo> {logEvent}, cancellationToken);
}
protected override Task WriteAsyncTask(IList<LogEventInfo> logEvents, CancellationToken cancellationToken)
{
InternalLogger.Info($"NLog.Extensions.AsyncTestTarget.WriteAsyncTask(List) : {logEvents.Count}");
if (!logEvents.Any())
return Task.CompletedTask;
// If this line is commented, the rows are batched as expected. If this line is left as-is, then after the first batch, records are sent one at a time.
System.Threading.Thread.Sleep(TimeSpan.FromMilliseconds(1500));
return Task.CompletedTask;
}
}
示例程序代码:
class Program
{
static ILogger logger = LogManager.GetCurrentClassLogger();
static void Main(string[] args)
{
for (var i = 0; i < 5000; i++)
{
logger.Info(i.ToString());
System.Threading.Thread.Sleep(TimeSpan.FromMilliseconds(100));
}
logger.Info("Done");
LogManager.Flush(TimeSpan.FromSeconds(15));
}
}
NLog配置:
<nlog internalLogLevel="Debug" internalLogToConsole="true">
<extensions>
<add assembly="ConsoleApp1"/>
</extensions>
<targets>
<target type="console" name="console"/>
<target type="AsyncTestTarget" name="test" />
</targets>
<rules>
<logger name="*" minlevel="Trace" writeTo="console" />
<logger name="*" minlevel="Trace" writeTo="test" />
</rules>
</nlog>
在Write AsyncTask(大)中睡眠的屏幕截图:qazxsw poi
NLog 4.6.1已经发布,解决了:#3185