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Ensure BufferBlocks are completed and empty in RowShufflingTransformer. #4479

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Merged
merged 2 commits into from
Nov 22, 2019
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Ensure BufferBlocks are completed and empty in RowShufflingTransformer. #4479

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Ensure BufferBlocks are completed and empty in RowShufflingTransformer.
eerhardt Nov 14, 2019
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eerhardt Nov 15, 2019
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30 changes: 22 additions & 8 deletions src/Microsoft.ML.Data/Transforms/RowShufflingTransformer.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -553,11 +553,24 @@ protected override void Dispose(bool disposing)
{
if (_disposed)
return;
if (disposing && _producerTask.Status == TaskStatus.Running)

if (disposing)
{
_toProduce.Post(0);
_toProduce.Complete();
_producerTask.Wait();

// Complete the consumer after the producerTask has finished, since producerTask could
// have posted more items to _toConsume.
_toConsume.Complete();

// Drain both BufferBlocks - this prevents what appears to be memory leaks when using the VS Debugger
// because if a BufferBlock still contains items, its underlying Tasks are not getting completed.
// See https://github.com/dotnet/corefx/issues/30582 for the VS Debugger issue.
// See also https://github.com/dotnet/machinelearning/issues/4399
_toProduce.TryReceiveAll(out _);
_toConsume.TryReceiveAll(out _);
}

_disposed = true;
base.Dispose(disposing);
}
Expand All @@ -578,15 +591,16 @@ private async Task LoopProducerWorker()
try
{
int circularIndex = 0;
for (; ; )
while (await _toProduce.OutputAvailableAsync().ConfigureAwait(false))
{
int requested = await _toProduce.ReceiveAsync();
if (requested == 0)
int requested;
if (!_toProduce.TryReceive(out requested))
{
// We had some sort of early exit. Just go out, do not post even the
// sentinel to the consumer, as nothing will be consumed any more.
return;
// OutputAvailableAsync returned true, but TryReceive returned false -
// so loop back around and try again.
continue;
}

Ch.Assert(requested >= _blockSize);
int numRows;
for (numRows = 0; numRows < requested; ++numRows)
Expand Down