Index: src/libchcore/TEventCounter.h
===================================================================
diff -u -rb051cbac8dac8c448507aa7c64753af9cf793af5 -rc175b6c9d5be6ee6ee0eae90abb167b9eaf2abc3
--- src/libchcore/TEventCounter.h	(.../TEventCounter.h)	(revision b051cbac8dac8c448507aa7c64753af9cf793af5)
+++ src/libchcore/TEventCounter.h	(.../TEventCounter.h)	(revision c175b6c9d5be6ee6ee0eae90abb167b9eaf2abc3)
@@ -35,7 +35,8 @@
 	public:
 		TEventCounter(T initialValue = 0) :
 			m_event(true, false),
-			m_tCounter(initialValue)
+			m_tCounter(initialValue),
+			m_tMaxUsed(initialValue)
 		{
 			UpdateEvent();
 		}
@@ -46,6 +47,8 @@
 		void Increase()
 		{
 			++m_tCounter;
+			if(m_tCounter > m_tMaxUsed)
+				m_tMaxUsed = m_tCounter;
 			UpdateEvent();
 		}
 
@@ -60,6 +63,11 @@
 			return m_tCounter;
 		}
 
+		T GetMaxUsed() const
+		{
+			return m_tMaxUsed;
+		}
+
 		HANDLE GetEventHandle() const
 		{
 			return m_event.Handle();
@@ -75,6 +83,7 @@
 	private:
 		TEvent m_event;
 		T m_tCounter;
+		T m_tMaxUsed;
 	};
 }
 
Index: src/libchcore/TOverlappedReaderFB.cpp
===================================================================
diff -u -rc719644bb4360fcf7ccf6f1139bcae852bd6effd -rc175b6c9d5be6ee6ee0eae90abb167b9eaf2abc3
--- src/libchcore/TOverlappedReaderFB.cpp	(.../TOverlappedReaderFB.cpp)	(revision c719644bb4360fcf7ccf6f1139bcae852bd6effd)
+++ src/libchcore/TOverlappedReaderFB.cpp	(.../TOverlappedReaderFB.cpp)	(revision c175b6c9d5be6ee6ee0eae90abb167b9eaf2abc3)
@@ -44,7 +44,8 @@
 		m_spSrcFileInfo(spSrcFileInfo),
 		m_spSrcFile(),
 		m_spStats(spStats),
-		m_rThreadController(rThreadController)
+		m_rThreadController(rThreadController),
+		m_spLog(logger::MakeLogger(spLogFileData, L"File-Reader"))
 	{
 		if(!spFeedbackHandler)
 			throw TCoreException(eErr_InvalidArgument, L"spFeedbackHandler is NULL", LOCATION);
@@ -146,6 +147,8 @@
 		WaitForOnTheFlyBuffers();
 		ClearQueues();
 
+		LOG_DEBUG(m_spLog) << L"Reader stopping processing. Max on-the-fly requests: " << m_counterOnTheFly.GetMaxUsed();
+
 		if(m_eThreadResult == TSubTaskBase::eSubResult_Continue && bDataSourceFinished)
 			m_eventReadingFinished.SetEvent();
 	}
Index: src/libchcore/TOverlappedReaderFB.h
===================================================================
diff -u -rc719644bb4360fcf7ccf6f1139bcae852bd6effd -rc175b6c9d5be6ee6ee0eae90abb167b9eaf2abc3
--- src/libchcore/TOverlappedReaderFB.h	(.../TOverlappedReaderFB.h)	(revision c719644bb4360fcf7ccf6f1139bcae852bd6effd)
+++ src/libchcore/TOverlappedReaderFB.h	(.../TOverlappedReaderFB.h)	(revision c175b6c9d5be6ee6ee0eae90abb167b9eaf2abc3)
@@ -83,6 +83,8 @@
 
 		TWorkerThreadController& m_rThreadController;
 		TSubTaskBase::ESubOperationResult m_eThreadResult = TSubTaskBase::eSubResult_Continue;
+
+		logger::TLoggerPtr m_spLog;
 	};
 
 	using TOverlappedReaderFBPtr = std::shared_ptr<TOverlappedReaderFB>;
Index: src/libchcore/TOverlappedWriterFB.cpp
===================================================================
diff -u -rc719644bb4360fcf7ccf6f1139bcae852bd6effd -rc175b6c9d5be6ee6ee0eae90abb167b9eaf2abc3
--- src/libchcore/TOverlappedWriterFB.cpp	(.../TOverlappedWriterFB.cpp)	(revision c719644bb4360fcf7ccf6f1139bcae852bd6effd)
+++ src/libchcore/TOverlappedWriterFB.cpp	(.../TOverlappedWriterFB.cpp)	(revision c175b6c9d5be6ee6ee0eae90abb167b9eaf2abc3)
@@ -48,7 +48,8 @@
 		m_eventProcessingFinished(true, false),
 		m_eventWritingFinished(true, false),
 		m_counterOnTheFly(),
-		m_rThreadController(rThreadController)
+		m_rThreadController(rThreadController),
+		m_spLog(logger::MakeLogger(spLogFileData, L"File-Writer"))
 	{
 		if(!spFilesystem)
 			throw TCoreException(eErr_InvalidArgument, L"spFilesystem is NULL", LOCATION);
@@ -77,12 +78,6 @@
 		if(!pBuffer)
 			throw TCoreException(eErr_InternalProblem, L"Write was possible, but no buffer is available", LOCATION);
 
-		if(m_bReleaseMode)
-		{
-			m_spWriter->AddEmptyBuffer(pBuffer);
-			return TSubTaskBase::eSubResult_Continue;
-		}
-
 		m_counterOnTheFly.Increase();
 
 		pBuffer->SetParam(this);
@@ -99,12 +94,6 @@
 		if(!pBuffer)
 			throw TCoreException(eErr_InternalProblem, L"Failed to retrieve write failed buffer", LOCATION);
 
-		if(m_bReleaseMode)
-		{
-			m_spWriter->AddEmptyBuffer(pBuffer);
-			return TSubTaskBase::eSubResult_Continue;
-		}
-
 		TSubTaskBase::ESubOperationResult eResult = m_spDstFile->HandleWriteError(*pBuffer);
 		if(eResult == TSubTaskBase::eSubResult_Retry)
 		{
@@ -126,15 +115,6 @@
 
 		file_size_t fsWritten = pBuffer->GetRealDataSize();
 
-		if(m_bReleaseMode)
-		{
-			AdjustProcessedSize(fsWritten);
-
-			m_spWriter->AddEmptyBuffer(pBuffer);
-
-			return TSubTaskBase::eSubResult_Continue;
-		}
-
 		TSubTaskBase::ESubOperationResult eResult = TSubTaskBase::eSubResult_Continue;
 		if(pBuffer->IsLastPart())
 		{
@@ -366,6 +346,8 @@
 
 		WaitForOnTheFlyBuffers();
 		ClearBuffers();
+		
+		LOG_DEBUG(m_spLog) << L"Writer stopping processing. Max on-the-fly requests: " << m_counterOnTheFly.GetMaxUsed();
 
 		if(m_eThreadResult == TSubTaskBase::eSubResult_Continue && bWrittenLastBuffer)
 			m_eventWritingFinished.SetEvent();
Index: src/libchcore/TOverlappedWriterFB.h
===================================================================
diff -u -rc719644bb4360fcf7ccf6f1139bcae852bd6effd -rc175b6c9d5be6ee6ee0eae90abb167b9eaf2abc3
--- src/libchcore/TOverlappedWriterFB.h	(.../TOverlappedWriterFB.h)	(revision c719644bb4360fcf7ccf6f1139bcae852bd6effd)
+++ src/libchcore/TOverlappedWriterFB.h	(.../TOverlappedWriterFB.h)	(revision c175b6c9d5be6ee6ee0eae90abb167b9eaf2abc3)
@@ -75,7 +75,6 @@
 		TSubTaskStatsInfoPtr m_spStats;
 		TFileInfoPtr m_spSrcFileInfo;
 		TOverlappedProcessorRangePtr m_spDataRange;
-		bool m_bReleaseMode = false;
 		bool m_bOnlyCreate = false;
 
 		TEvent m_eventProcessingFinished;
@@ -85,6 +84,8 @@
 
 		TWorkerThreadController& m_rThreadController;
 		TSubTaskBase::ESubOperationResult m_eThreadResult = TSubTaskBase::eSubResult_Continue;
+
+		logger::TLoggerPtr m_spLog;
 	};
 
 	using TOverlappedWriterFBPtr = std::shared_ptr<TOverlappedWriterFB>;