finagle-http: allow streaming of fixed length messages #740

koiuo · 2018-10-21T22:47:17Z

Problem

Server.withStreaming(true) only enables streaming for requests with
chunked encoding. Requests without chunked encoding are still buffered
up to max allowed request size. This is not desirable for some use cases

#538

Solution

Introduce new stack parameter FixedLengthStreamedAfter which determines
the maximum content length for the FixedLengthMessageAggregator in netty
server pipeline.

Default value for the new parameter is 5.megabytes which forces
streaming of messages with body exceeding 5 MiB (changes former
behavior).

Result

Server-side:

val server = Http.server
  .withStreaming(true)
  .withMaxRequestSize(50.megabytes)

will stream messages with Transfer-Encoding: chunked and messages
without the header if Content-Length is larger than 5242880.
To revert to previous behavior fixedLengthStreamedAfter must be set to
the value of maxRequestSize

val server = Http.server
  .withStreaming(true, fixedLengthStreamedAfter = 50.megabytes)
  .withMaxRequestSize(50.megabytes)

Requires custom finagle 18.5.0 twitter/finagle#740 PoC fix for linkerd#1691

luciferous · 2018-10-23T03:02:28Z

This looks good to me.

I'm not sure how I feel about the name, but I can't think of something better right now. Also, I wonder if it's reasonable to invert this API, i.e., when withStreaming(true) we ALWAYS stream the message body, and add a parameter where if the message is under this size then we buffer it. What do you think?

// Always streams message bodies, but if we know the
// Content-Length is under 128KB, then we fully buffer.
Http.withStreaming(true, 128.kilobytes)

koiuo · 2018-10-23T12:40:46Z

@luciferous
thanks for a quick feedback.

I agree, that the API is confusing. My main motivation was backward compatibility, and I'm eager to redo this if compatibility is not an issue.

If developers always decide between using content or reader basing on the value returned by isChunked, then it is safe to invert the API. I'd vote for doing this.

Regardless of whether we invert or not, I like your idea with optional parameter.

vkostyukov · 2018-10-23T17:17:08Z

finagle-netty4-http/src/main/scala/com/twitter/finagle/netty4/http/package.scala

@@ -146,7 +147,7 @@ package object http {
 // specific HttpServerExpectContinueHandler above.
 pipeline.addLast(
 "fixedLenAggregator",
- new FixedLengthMessageAggregator(maxRequestSize, handleExpectContinue = false)
+ new FixedLengthMessageAggregator(maxRequestSize, dechunkThreshold, handleExpectContinue = false)


What about the client side? Here is how it looks today:

// 8 KB is the size of the maxChunkSize parameter used in netty3, // which is where it stops attempting to aggregate messages that lack // a 'Transfer-Encoding: chunked' header. fn("fixedLenAggregator", new FixedLengthMessageAggregator(8.kilobytes))

Thinking about this more, it seems we shouldn't probably use the maxRequestSize here at all and just introduce a separate parameter for it instead.

I like @luciferous' suggestion. And I would go with minChunkSize as a parameter name.

Http.server.withStreaming(true, minChunkSize = 128.kb)

I had no intention to implement client side, but I'm open doing this if you think we need that. I do not know, however, what is the behavior right now, and what it should be. Would need to investigate.

minChunkSize is a bit confusing for me.
In general, it is confusing, that finagle's chunk is different from http chunk. It took me some time to realize, that Request.isChunked has, strictly speaking, nothing to do with Transfer-Encoding header.
If you believe, that for experienced finagle users minChunkSize would clearly mean finagle's chunk, then let's do this name. Otherwise, I, as non-experienced finagle user, would prefer to see the parameter named smthng like streamingThreshold

Let's go with minChunkSize for now, if we think of something better during the review we can always change it.

I think we should change the client-side too as, otherwise, Http.client.withStreaming(true, 128.kb) would mean the minChunkSize is silently ignored.

@vkostyukov, buffering indeed may happen, but not in FixedLengthMessageAggregator.
Aggregator's buffering is all-or-nothing: we either buffer all message into a huge buffer up to maxContentLength or we bypass the aggregator, and emit chunks of data as they arrive from the upstream handlers in pipeline (and in this case minChunkSize does not have any effect).

So for example if we have a sufficiently large minChunkSize (say, 128 KiB) that is used as a maxContentLength for FixedLengthMessageAggregator, then the consumer of Request.reader wil actually never read a buffer of size 128*1024. On contrary, 128 KiB will likely be maximal theoretical value the consumer can read.

Okay, I'm convinced. Sorry for the confusion, I think I mis-understood what FixedLengthMessageAggregator does. bufferSize seems reasonable but, still, could be interpreted as "buffer my chunks pls".

Perhaps something as verbose as aggregateIfLessThan = 128.kb.

I don't have any better ideas. aggregateIfLessThan works for me.

@luciferous
small clarification

bufferSize = 128.kilobytes: buffer up to 128.kilobytes; Reader.read will ALWAYS return buf where buf.length <= 128.kilobytes

if

bufferSizez is very small. For example bufferSize == 100.bytes

request has Transfer-Encoding: chunked or request Content-Length is > 100
then Request.reader.read(128.kilobytes.inBytes) will likely read buf with buf.length > 100 (the value will be determined by upstream handlers in netty pipeline)

if

bufferSizez is very small. For example bufferSize == 100.bytes

request does NOT have Transfer-Encoding: chunked and request Content-Length is <= 100
then Request.reader.read(128.kilobytes.inBytes) is guaranteed to read buf with buf.length <= 100

So, as you see, there are no guarantees at all.

This discussion makes me think, that maybe we need couple of tests to demonstrate that behavior, so it is easier to reason about the handler behavior?
In the meantime I will make an attempt to improve the scaladoc on the aggregator.

OK, I'm not sure I follow, but hopefully some test/docs will clarify. I'll think about it more too.

vkostyukov · 2018-10-23T17:18:33Z

...tp/src/main/scala/com/twitter/finagle/netty4/http/handler/FixedLengthMessageAggregator.scala

@@ -12,9 +12,18 @@ import io.netty.handler.codec.http._
 */
 private[http] class FixedLengthMessageAggregator(
 maxContentLength: StorageUnit,
- handleExpectContinue: Boolean = true
+ dechunkThreshold: StorageUnit,


Maybe keep using a single StorageUnit parameter and set it to min between the two on the call-site?

I agree. I'm reworking this code right now and came to the same conclusion.

Initially I wasn't sure, if we can set maxContentLength to 0 and still retain all the features.
Now I looked more carefully in the code, and it seems, that the only case when we really aggregate something in buf is when there's a HttpMessage with following HttpContent.

All other cases only make sure, that the request, when it makes sense, has isChunked set to false and content is available as string or buf.

I wonder even, if it makes sense to eventually split FixedLengthMessageAggregator so it has more clear purpose: one class should handle actual aggregation, and the other one should handle all the quirks, like noContentResponse and messages without content-length and trasfer-encoding headers..

luciferous · 2018-10-23T17:45:21Z

I think let's go ahead with the Http.*.withStreaming(true, 128.kilobytes) API and note the behavioral change in CHANGELOG.rst.

@vkostyukov's suggestion of minChunkSize sounds good.

...tp/src/main/scala/com/twitter/finagle/netty4/http/handler/FixedLengthMessageAggregator.scala

koiuo · 2018-10-24T14:29:14Z

I fixed review notes.

I need some time to figure out why tests fail if buffer size for the aggregator is 0.

I thought, it should work, but apparently I missed something. My guess atm, is that even when we deduced a message length to be zero, netty can still send some content which we attempt to buffer (and since buffer length is 0, aggregator returns error 413).

Or maybe some tests just have to be adjusted.

codecov-io · 2018-10-24T18:01:18Z

Codecov Report

Merging #740 into develop will increase coverage by 0.64%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop     #740      +/-   ##
===========================================
+ Coverage    70.43%   71.07%   +0.64%     
===========================================
  Files          745      679      -66     
  Lines        23724    20710    -3014     
  Branches      1736     1540     -196     
===========================================
- Hits         16709    14719    -1990     
+ Misses        7015     5991    -1024

Impacted Files	Coverage Δ
...y4/http/handler/FixedLengthMessageAggregator.scala	`95.83% <ø> (ø)`	⬆️
...cala/com/twitter/finagle/netty4/http/package.scala	`95.31% <100%> (+0.15%)`	⬆️
...http/src/main/scala/com/twitter/finagle/Http.scala	`82.45% <100%> (+0.2%)`	⬆️
.../scala/com/twitter/finagle/http/param/params.scala	`100% <100%> (ø)`	⬆️
...twitter/finagle/mux/lease/exp/RequestSnooper.scala	`0% <0%> (-100%)`	⬇️
...er/finagle/mux/stats/MuxCancelledCategorizer.scala	`0% <0%> (-100%)`	⬇️
...witter/finagle/netty4/decoder/DecoderHandler.scala	`0% <0%> (-100%)`	⬇️
...hreading/EventLoopGroupExecutionDelayTracker.scala	`0% <0%> (-100%)`	⬇️
...ter/finagle/mux/lease/exp/GenerationalRandom.scala	`0% <0%> (-100%)`	⬇️
...om/twitter/finagle/netty4/encoder/BufEncoder.scala	`0% <0%> (-100%)`	⬇️
... and 158 more

Continue to review full report at Codecov.

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Powered by Codecov. Last update f306467...6db98df. Read the comment docs.

koiuo · 2018-10-24T18:05:46Z

I fixed the failing test. The issue was not in the code, but in the test itself. It assumed, that the incoming request is not chunked, hence its reader has all the content already, hence it is safe to read it synchronously.

Do we want to get back to the parameter name discussion and try to comeup with better name? Or do you think it's good as is? If yes, do you want me to squash all the commits into a single one before you merge?

finagle-netty4-http/src/main/scala/com/twitter/finagle/netty4/http/package.scala

vkostyukov · 2018-10-24T18:26:05Z

finagle-http/src/main/scala/com/twitter/finagle/Http.scala

 */
- def withStreaming(enabled: Boolean): Server =
- configured(http.param.Streaming(enabled))
+ def withStreaming(enabled: Boolean, aggregateIfLessThen: StorageUnit = zero): Server =


Let's make it a separate method. Java doesn't understand default arguments.

👍

Also what do you think of using AggregateIfLessThan.aggregateIfLessThan.default instead of zero

I'll take this opportunity to offer once again different name for the property. I promise it's the last time I'm raising this :)

withAggregateIfLessThan
con: does not suggest in any way, that it is realted to streaming
con: while it is very verbose and explicit, it is almost too explicit, delusionally explicit.
It explicitly says, what the framework will do. And even mentions some condition. But not all conditions are mentioned. That's why it is delusional.

Few alternatives

withStreamingThreshold(64.kilobytes)
pro: suggests that it is related to streaming
pro: threshold is a very general term, I'd decide to read docs to know how behavior changes once threshold is reached and wouldn't be fooled by an overly explicit name

withStreamingBuffer(64.kilobytes)
pro: suggests that it is realted to streaming
pro: buffer is a very generic term, so I'd probably decide to read docs and wouldn't be fooled by an overly explicit name
con: even more delusional than withAggregateIfLessThan

withContentLengthStreamedAfter(64.kilobytes)
pro: suggest, that it is realted to streaming (if you typed Str in IDE you'd likely see this among suggestions)
pro: suggests that it may be realted to Content-Length (which is the truth, we only aggregate, if there's content-length header). IMO it is the least delusional name.
con: not less verbose, than withAggregateIfLessThan, but, imo, much more readable

withFixedLengthStreamedAfter(64.kilobytes)
pro: related to streaming
pro: suggests, that it is related to fixed length messages
con: develop must know what is a fixed length message
con: verbose

withStreamingAfter(contentLength: StorageUnit)
pro: related to streaming
pro: related to content length
con: contentLength is only present in method definition and only in original sources (won't work on decompiled code)

I like all of those names but I'm still in the "we should group this new config with withStreaming" camp. As the new value only takes affect when streaming is enabled, we might want to keep them together (one configuration entry and perhaps one stack param).

Actually I think fixedLengthStreamedAfter is pretty cool and could make a good pair for enabled:

withStreaming(enabled = true, fixedLengthStreamedAfter = 64.kb)

Ugh, I misunderstood about separating a method.
Apparently you suggested an overloaded version of withStreaming...

Oh yeah, sorry I if I wasn't clear. Basically we're trying to ensure our APIs are accessible from Java which, unfortunately, means saying no to default arguments.

koiuo · 2018-10-24T18:37:08Z

I think, having few e2e tests that test only new mixed behavior are needed. I only tested this manually. I'll add some shortly.

luciferous · 2018-10-24T15:44:06Z

finagle-base-http/src/main/scala/com/twitter/finagle/http/param/params.scala

+case class AggregateIfLessThan(size: StorageUnit)
+object AggregateIfLessThan {
+ implicit val aggregateIfLessThan: Stack.Param[AggregateIfLessThan] =
+ Stack.Param(AggregateIfLessThan(StorageUnit.zero))


Thinking more about this, an 8KB default may be a reasonable default here. What do people think?

Yes, I like 8kb.

luciferous · 2018-10-24T19:03:58Z

finagle-http/src/main/scala/com/twitter/finagle/Http.scala

 */
- def withStreaming(enabled: Boolean): Server =
- configured(http.param.Streaming(enabled))
+ def withStreaming(enabled: Boolean, aggregateIfLessThen: StorageUnit = zero): Server =


👍

Also what do you think of using AggregateIfLessThan.aggregateIfLessThan.default instead of zero

finagle-netty4-http/src/main/scala/com/twitter/finagle/netty4/http/package.scala

vkostyukov

Looks really good @edio! Again, appreciate your patience with this!

vkostyukov · 2018-10-25T05:38:08Z

finagle-http/src/main/scala/com/twitter/finagle/Http.scala

 */
 def withStreaming(enabled: Boolean): Server =
 configured(http.param.Streaming(enabled))

+ /**
+ * Streaming allows applications to work with HTTP messages that have large


Love these docs! Ty!

vkostyukov · 2018-10-25T05:39:16Z

finagle-base-http/src/main/scala/com/twitter/finagle/http/param/params.scala

+case class FixedLengthStreamedAfter(size: StorageUnit)
+object FixedLengthStreamedAfter {
+ implicit val fixedLengthStreamedAfter: Stack.Param[FixedLengthStreamedAfter] =
+ Stack.Param(FixedLengthStreamedAfter(StorageUnit.zero))


@luciferous talked about using 8k for a default value here. I liked that at first but maybe we're better off preserving the current "default" behavior and using 5.mb as a value?

Sounds good.

@edio This thread.

luciferous

Thanks again for this change @edio

luciferous · 2018-10-25T17:09:13Z

finagle-base-http/src/main/scala/com/twitter/finagle/http/param/params.scala

+case class FixedLengthStreamedAfter(size: StorageUnit)
+object FixedLengthStreamedAfter {
+ implicit val fixedLengthStreamedAfter: Stack.Param[FixedLengthStreamedAfter] =
+ Stack.Param(FixedLengthStreamedAfter(StorageUnit.zero))


Sounds good.

koiuo · 2018-10-25T19:01:41Z

A quick update: I've been busy with other stuff today. Still working on those tests.

Problem Server.withStreaming(true) only enables streaming for requests with chunked encoding. Requests without Transfer-Enconding are still buffered up to max allowed request size. This is not desirable for some use cases twitter#538 Solution Introduce new stack parameter MinChunkSize which determines the maximum content length for the FixedLengthMessageAggregator in netty server pipeline. Default value for the new parameter is 0 which forces streaming of all messages (changes former behavior). Result Server-side: val server = Http.server .withStreaming(true) will stream messages both with and without Transfer-Encoding. To revert to previous behavior minChunkSize must be set to non-zero value val server = Http.server .withStreaming(true, minChunkSize = 5.megabytes)

Introduce overloaded version of withStreaming for Java compatibility Update scaladocs

koiuo · 2018-10-25T22:45:09Z

I added couple of tests to cover cases we discussed. Sorry for all those force pushes.

@vkostyukov, github says, there's still some change requested by you, but I looked through all the threads, and seems, that everything is covered. Did I miss something?

Let me know, if you want me to squash the changes.

vkostyukov · 2018-10-25T22:48:27Z

I added couple of tests to cover cases we discussed. Sorry for all those force pushes.

@vkostyukov, github says, there's still some change requested by you, but I looked through all the threads, and seems, that everything is covered. Did I miss something?

Let me know, if you want me to squash the changes.

Again, thanks a ton for following through this! You don't need to squash - we'll do that on our end.

One thing I believe we should change before proceeding is set a default value to 5.mb (the current default), instead of 0.

vkostyukov

I like this a lot!

Our oncall will pull this for internal testing shortly (unless they have any additional feedback).

bryce-anderson

I second @vkostyukov, thanks for the better docs!

finagle-http/src/main/scala/com/twitter/finagle/Http.scala

Co-Authored-By: edio <[email protected]>

vkostyukov · 2018-10-27T17:45:48Z

This was merged internally and made it back to Github: a3094f3

Thank you again @edio!

koiuo · 2018-10-27T19:11:31Z

Thanks for thorough reviews, folks! It was a pleasure to work on this with you.

@vkostyukov, I assumed, that the commit message will be set from PR description on squash. First commit message in PR became a bit inaccurate after all the fixes applied:

Default value for the new parameter is 0 which forces streaming of all messages (changes former behavior).

IDK if that's too late to fix. In any case, that's nothing critical I guess.

vkostyukov · 2018-10-27T21:39:38Z

IDK if that's too late to fix. In any case, that's nothing critical I guess.

Don't worry about that. It's not a big deal.

When Linkerd receives a significantly large HTTP request with a set content-length, the underlying Finagle router service buffers the entire message into memory instead of streaming the HTTP message in smaller chunks. This can cause problems when a client is sending very large file uploads without using `Transfer-Encoding: Chunked` This PR pulls in a new Finagle param [(#740)](twitter/finagle#740) that forces a finagle server to receive large HTTP messages in smaller chunks when the HTTP messages content-length exceeds a certain content-length threshold. In addition, Linkerd exposes this Finagle param to allow for configurability. I was able to test this out in a docker environment where I sent a significantly large file (140MB) to Linkerd. Previously Linkerd would load buffer the entire message into memory and was easily visible in the JVM memory usage. After the change, the same request was issued again and we no longer observe the spike in memory. fixes #2188 Signed-off-by: Dennis Adjei-Baah <[email protected]>

koiuo force-pushed the feature/unchunked_streaming branch from dee3e4a to ebfdc52 Compare October 22, 2018 18:45

koiuo added a commit to koiuo/linkerd that referenced this pull request Oct 22, 2018

Implement unchunked requests streaming

7943c71

Requires custom finagle 18.5.0 twitter/finagle#740 PoC fix for linkerd#1691

koiuo mentioned this pull request Oct 22, 2018

Support for large requests and responses linkerd/linkerd#1691

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koiuo force-pushed the feature/unchunked_streaming branch from ebfdc52 to 94eca45 Compare October 22, 2018 21:04

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koiuo force-pushed the feature/unchunked_streaming branch 3 times, most recently from f817dcf to 7ac232c Compare October 25, 2018 21:55

koiuo added 4 commits October 25, 2018 17:57

Improve FixedLengthMessageAggregator documentation

87760a1

Clarify criteria for considering message fixed length

c726765

Improve docs and parameters names

166438b

koiuo added 2 commits October 25, 2018 17:57

Do not assume request is not chunked in E2E test

8663ae0

Rename aggregateIfLessThen to fixedLengthStreamedAfter

7d95cbd

Introduce overloaded version of withStreaming for Java compatibility Update scaladocs

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Add e2e tests for new server behavior

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koiuo changed the title ~~finagle-http: introduce withDechunkThreshold~~ finagle-http: allow streaming of fixed length messages Oct 25, 2018

Change default value for FixedLengthStreamedAfter

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Update finagle-http/src/main/scala/com/twitter/finagle/Http.scala

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Co-Authored-By: edio <[email protected]>

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dadjeibaah mentioned this pull request Dec 11, 2018

Add new streamAfterContentLengthKB config field for HTTP/1 linkerd/linkerd#2189

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luciferous mentioned this pull request Jul 23, 2019

MaxRequestSize/MaxResponseSize and fixedLengthStreamedAfter unexpected behavior #780

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luciferous mentioned this pull request Aug 2, 2019

Remove PayloadSizeHandler from Streaming.Enabled case #781

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finagle-http: allow streaming of fixed length messages #740

finagle-http: allow streaming of fixed length messages #740

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