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Disable auto ack for HTTP/2 PING frames by netty #1558
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Motivation: `KeepAliveManager#pingReceived` always acks PING frames. Netty's auto ack produces additional PING-ack frames that are not necessary and confusing. Modifications: - Use `Http2FrameCodecBuilder#autoAckPingFrame(false)` on client and server sides; Result: No duplicated PING frames written with ack=true.
idelpivnitskiy
commented
May 13, 2021
@@ -48,6 +48,8 @@ public void init(final Channel channel) { | |||
// The max concurrent streams is made available via a publisher and may be consumed asynchronously | |||
// (e.g. when offloading is enabled), so we manually control the SETTINGS ACK frames. | |||
.autoAckSettingsFrame(false) | |||
// We ack PING frames in KeepAliveManager#pingReceived. | |||
.autoAckPingFrame(false) |
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All PING frames are handled here and always ack'ed:
servicetalk/servicetalk-http-netty/src/main/java/io/servicetalk/http/netty/KeepAliveManager.java
Lines 142 to 159 in 6b4a240
void pingReceived(final Http2PingFrame pingFrame) { | |
assert channel.eventLoop().inEventLoop(); | |
if (pingFrame.ack()) { | |
long pingAckContent = pingFrame.content(); | |
if (pingAckContent == GRACEFUL_CLOSE_PING_CONTENT) { | |
LOGGER.debug("channel={}, graceful close ping ack received.", channel); | |
cancelIfStateIsAFuture(gracefulCloseState); | |
gracefulCloseWriteSecondGoAway(); | |
} else if (pingAckContent == KEEP_ALIVE_PING_CONTENT) { | |
cancelIfStateIsAFuture(keepAliveState); | |
keepAliveState = null; | |
} | |
} else { | |
// Send an ack for the received ping | |
channel.writeAndFlush(new DefaultHttp2PingFrame(pingFrame.content(), true)); | |
} | |
} |
bondolo
approved these changes
May 13, 2021
hbelmiro
pushed a commit
to hbelmiro/servicetalk
that referenced
this pull request
May 23, 2021
Motivation: `KeepAliveManager#pingReceived` always acks PING frames. Netty's auto ack produces additional PING-ack frames that are not necessary and confusing. Modifications: - Use `Http2FrameCodecBuilder#autoAckPingFrame(false)` on client and server sides; Result: No duplicated PING frames written with ack=true.
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Motivation:
KeepAliveManager#pingReceived
always acks PING frames. Netty's autoack produces additional PING-ack frames that are not necessary and
confusing.
Modifications:
Http2FrameCodecBuilder#autoAckPingFrame(false)
on client andserver sides;
Result:
No duplicated PING frames written with ack=true.