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core: Workaround retry causing memory leak
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Data is getting orphaned sitting in MessageFramer. This hack thus always
flushes data out of the framer so no data can remain sitting there.

See #9340
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@ejona86
ejona86 authored Jul 15, 2022
1 parent 6609f11 commit 4cb1fba
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Showing 2 changed files with 69 additions and 12 deletions.
4 changes: 4 additions & 0 deletions core/src/main/java/io/grpc/internal/RetriableStream.java
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Original file line number Diff line number Diff line change
Expand Up @@ -550,6 +550,10 @@ class SendMessageEntry implements BufferEntry {
@Override
public void runWith(Substream substream) {
substream.stream.writeMessage(method.streamRequest(message));
// TODO(ejona): Workaround Netty memory leak. Message writes always need to be followed by
// flushes (or half close), but retry appears to have a code path that the flushes may
// not happen. The code needs to be fixed and this removed. See #9340.
substream.stream.flush();
}
}

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77 changes: 65 additions & 12 deletions core/src/test/java/io/grpc/internal/RetriableStreamTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -268,10 +268,14 @@ public Void answer(InvocationOnMock in) {
retriableStream.sendMessage("msg3");
retriableStream.request(456);

inOrder.verify(mockStream1, times(2)).writeMessage(any(InputStream.class));
inOrder.verify(mockStream1).writeMessage(any(InputStream.class));
inOrder.verify(mockStream1).flush(); // Memory leak workaround
inOrder.verify(mockStream1).writeMessage(any(InputStream.class));
inOrder.verify(mockStream1).flush(); // Memory leak workaround
inOrder.verify(mockStream1).request(345);
inOrder.verify(mockStream1, times(2)).flush();
inOrder.verify(mockStream1).writeMessage(any(InputStream.class));
inOrder.verify(mockStream1).flush(); // Memory leak workaround
inOrder.verify(mockStream1).request(456);
inOrder.verifyNoMoreInteractions();

Expand Down Expand Up @@ -304,12 +308,19 @@ public Void answer(InvocationOnMock in) {
ArgumentCaptor<ClientStreamListener> sublistenerCaptor2 =
ArgumentCaptor.forClass(ClientStreamListener.class);
inOrder.verify(mockStream2).start(sublistenerCaptor2.capture());
inOrder.verify(mockStream2, times(2)).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).flush(); // Memory leak workaround
inOrder.verify(mockStream2).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).flush(); // Memory leak workaround
inOrder.verify(mockStream2).request(345);
inOrder.verify(mockStream2, times(2)).flush();
inOrder.verify(mockStream2).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).flush(); // Memory leak workaround
inOrder.verify(mockStream2).request(456);
inOrder.verify(mockStream2, times(2)).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).flush(); // Memory leak workaround
inOrder.verify(mockStream2).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).flush(); // Memory leak workaround
inOrder.verify(mockStream2).isReady();
inOrder.verifyNoMoreInteractions();

Expand All @@ -319,7 +330,10 @@ public Void answer(InvocationOnMock in) {

// mockStream1 is closed so it is not in the drainedSubstreams
verifyNoMoreInteractions(mockStream1);
inOrder.verify(mockStream2, times(2)).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).flush(); // Memory leak workaround
inOrder.verify(mockStream2).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).flush(); // Memory leak workaround

// retry2
doReturn(mockStream3).when(retriableStreamRecorder).newSubstream(2);
Expand Down Expand Up @@ -353,12 +367,19 @@ public Void answer(InvocationOnMock in) {
ArgumentCaptor<ClientStreamListener> sublistenerCaptor3 =
ArgumentCaptor.forClass(ClientStreamListener.class);
inOrder.verify(mockStream3).start(sublistenerCaptor3.capture());
inOrder.verify(mockStream3, times(2)).writeMessage(any(InputStream.class));
inOrder.verify(mockStream3).writeMessage(any(InputStream.class));
inOrder.verify(mockStream3).flush(); // Memory leak workaround
inOrder.verify(mockStream3).writeMessage(any(InputStream.class));
inOrder.verify(mockStream3).flush(); // Memory leak workaround
inOrder.verify(mockStream3).request(345);
inOrder.verify(mockStream3, times(2)).flush();
inOrder.verify(mockStream3).writeMessage(any(InputStream.class));
inOrder.verify(mockStream3).flush(); // Memory leak workaround
inOrder.verify(mockStream3).request(456);
inOrder.verify(mockStream3, times(7)).writeMessage(any(InputStream.class));
for (int i = 0; i < 7; i++) {
inOrder.verify(mockStream3).writeMessage(any(InputStream.class));
inOrder.verify(mockStream3).flush(); // Memory leak workaround
}
inOrder.verify(mockStream3).isReady();
inOrder.verifyNoMoreInteractions();

Expand Down Expand Up @@ -1958,10 +1979,14 @@ public Void answer(InvocationOnMock in) {
hedgingStream.sendMessage("msg3");
hedgingStream.request(456);

inOrder.verify(mockStream1, times(2)).writeMessage(any(InputStream.class));
inOrder.verify(mockStream1).writeMessage(any(InputStream.class));
inOrder.verify(mockStream1).flush(); // Memory leak workaround
inOrder.verify(mockStream1).writeMessage(any(InputStream.class));
inOrder.verify(mockStream1).flush(); // Memory leak workaround
inOrder.verify(mockStream1).request(345);
inOrder.verify(mockStream1, times(2)).flush();
inOrder.verify(mockStream1).writeMessage(any(InputStream.class));
inOrder.verify(mockStream1).flush(); // Memory leak workaround
inOrder.verify(mockStream1).request(456);
inOrder.verifyNoMoreInteractions();

Expand All @@ -1984,10 +2009,14 @@ public Void answer(InvocationOnMock in) {
ArgumentCaptor<ClientStreamListener> sublistenerCaptor2 =
ArgumentCaptor.forClass(ClientStreamListener.class);
inOrder.verify(mockStream2).start(sublistenerCaptor2.capture());
inOrder.verify(mockStream2, times(2)).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).flush(); // Memory leak workaround
inOrder.verify(mockStream2).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).flush(); // Memory leak workaround
inOrder.verify(mockStream2).request(345);
inOrder.verify(mockStream2, times(2)).flush();
inOrder.verify(mockStream2).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).flush(); // Memory leak workaround
inOrder.verify(mockStream2).request(456);
inOrder.verify(mockStream1).isReady();
inOrder.verify(mockStream2).isReady();
Expand All @@ -1998,9 +2027,13 @@ public Void answer(InvocationOnMock in) {
hedgingStream.sendMessage("msg2 after hedge2 starts");

inOrder.verify(mockStream1).writeMessage(any(InputStream.class));
inOrder.verify(mockStream1).flush(); // Memory leak workaround
inOrder.verify(mockStream2).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).flush(); // Memory leak workaround
inOrder.verify(mockStream1).writeMessage(any(InputStream.class));
inOrder.verify(mockStream1).flush(); // Memory leak workaround
inOrder.verify(mockStream2).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).flush(); // Memory leak workaround
inOrder.verifyNoMoreInteractions();


Expand All @@ -2022,12 +2055,19 @@ public Void answer(InvocationOnMock in) {
ArgumentCaptor<ClientStreamListener> sublistenerCaptor3 =
ArgumentCaptor.forClass(ClientStreamListener.class);
inOrder.verify(mockStream3).start(sublistenerCaptor3.capture());
inOrder.verify(mockStream3, times(2)).writeMessage(any(InputStream.class));
inOrder.verify(mockStream3).writeMessage(any(InputStream.class));
inOrder.verify(mockStream3).flush(); // Memory leak workaround
inOrder.verify(mockStream3).writeMessage(any(InputStream.class));
inOrder.verify(mockStream3).flush(); // Memory leak workaround
inOrder.verify(mockStream3).request(345);
inOrder.verify(mockStream3, times(2)).flush();
inOrder.verify(mockStream3).writeMessage(any(InputStream.class));
inOrder.verify(mockStream3).flush(); // Memory leak workaround
inOrder.verify(mockStream3).request(456);
inOrder.verify(mockStream3, times(2)).writeMessage(any(InputStream.class));
inOrder.verify(mockStream3).writeMessage(any(InputStream.class));
inOrder.verify(mockStream3).flush(); // Memory leak workaround
inOrder.verify(mockStream3).writeMessage(any(InputStream.class));
inOrder.verify(mockStream3).flush(); // Memory leak workaround
inOrder.verify(mockStream1).isReady();
inOrder.verify(mockStream2).isReady();
inOrder.verify(mockStream3).isReady();
Expand All @@ -2036,8 +2076,11 @@ public Void answer(InvocationOnMock in) {
// send one more message
hedgingStream.sendMessage("msg1 after hedge3 starts");
inOrder.verify(mockStream1).writeMessage(any(InputStream.class));
inOrder.verify(mockStream1).flush(); // Memory leak workaround
inOrder.verify(mockStream2).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).flush(); // Memory leak workaround
inOrder.verify(mockStream3).writeMessage(any(InputStream.class));
inOrder.verify(mockStream3).flush(); // Memory leak workaround

// hedge3 receives nonFatalStatus
sublistenerCaptor3.getValue().closed(
Expand All @@ -2047,7 +2090,9 @@ public Void answer(InvocationOnMock in) {
// send one more message
hedgingStream.sendMessage("msg1 after hedge3 fails");
inOrder.verify(mockStream1).writeMessage(any(InputStream.class));
inOrder.verify(mockStream1).flush(); // Memory leak workaround
inOrder.verify(mockStream2).writeMessage(any(InputStream.class));
inOrder.verify(mockStream2).flush(); // Memory leak workaround

// the hedge mockStream4 starts
fakeClock.forwardTime(HEDGING_DELAY_IN_SECONDS, TimeUnit.SECONDS);
Expand All @@ -2067,12 +2112,19 @@ public Void answer(InvocationOnMock in) {
ArgumentCaptor<ClientStreamListener> sublistenerCaptor4 =
ArgumentCaptor.forClass(ClientStreamListener.class);
inOrder.verify(mockStream4).start(sublistenerCaptor4.capture());
inOrder.verify(mockStream4, times(2)).writeMessage(any(InputStream.class));
inOrder.verify(mockStream4).writeMessage(any(InputStream.class));
inOrder.verify(mockStream4).flush(); // Memory leak workaround
inOrder.verify(mockStream4).writeMessage(any(InputStream.class));
inOrder.verify(mockStream4).flush(); // Memory leak workaround
inOrder.verify(mockStream4).request(345);
inOrder.verify(mockStream4, times(2)).flush();
inOrder.verify(mockStream4).writeMessage(any(InputStream.class));
inOrder.verify(mockStream4).flush(); // Memory leak workaround
inOrder.verify(mockStream4).request(456);
inOrder.verify(mockStream4, times(4)).writeMessage(any(InputStream.class));
for (int i = 0; i < 4; i++) {
inOrder.verify(mockStream4).writeMessage(any(InputStream.class));
inOrder.verify(mockStream4).flush(); // Memory leak workaround
}
inOrder.verify(mockStream1).isReady();
inOrder.verify(mockStream2).isReady();
inOrder.verify(mockStream4).isReady();
Expand Down Expand Up @@ -2190,6 +2242,7 @@ public void hedging_maxAttempts() {

hedgingStream.sendMessage("msg1 after commit");
inOrder.verify(mockStream3).writeMessage(any(InputStream.class));
inOrder.verify(mockStream3).flush(); // Memory leak workaround
inOrder.verifyNoMoreInteractions();

Metadata heders = new Metadata();
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