[jira] [Created] (MESOS-3562) Anomalous bytes in stream from HTTPI Api

["Ben Whitehead (JIRA)" <ji...@apache.org>]

Ben Whitehead created MESOS-3562:
------------------------------------

             Summary: Anomalous bytes in stream from HTTPI Api
                 Key: MESOS-3562
                 URL: https://issues.apache.org/jira/browse/MESOS-3562
             Project: Mesos
          Issue Type: Bug
          Components: HTTP API
    Affects Versions: 0.24.0
         Environment: Linux 3.16.7-24-desktop #1 SMP PREEMPT Mon Aug 3 14:37:06 UTC 2015 (ec183cc) x86_64 x86_64 GNU/Linux

Mesos 0.24.0
gcc (SUSE Linux) 4.8.3 20140627 [gcc-4_8-branch revision 212064]
            Reporter: Ben Whitehead
            Priority: Blocker
         Attachments: app.log, tcpdump.log

When connecting to the new HTTP Api and attempting to {{SUBSCRIBE}} there are some anomalous bytes contained in the chunked stream that appear to be causing problems when I attempting to integrate.

Attached are two log files. app.log represents my application trying to connect to mesos using RxNetty. Netty has been configured to log all data it sends/receives over the wire this can be seen in the byte blocks in the log. tcpdump.log contains a tcp dump between the mesos master and my client.

The client is constructing a protobuf in java for the subscribe call  
{code:java}
        final Call subscribeCall = Call.newBuilder()
            .setType(Call.Type.SUBSCRIBE)
            .setSubscribe(
                Call.Subscribe.newBuilder()
                    .setFrameworkInfo(
                        Protos.FrameworkInfo.newBuilder()
                            .setUser("bill")
                            .setName("testing_this_shit_out")
                            .build()
                    )
            )
            .build();
{code}
 
lient sends the protobuf to mesos with the following request headers:
{code}
POST /api/v1/scheduler HTTP/1.1
Content-Type: application/x-protobuf
Accept: application/json
Content-Length: 35
Host: localhost:5050
User-Agent: RxNetty Client
{code}
The body is then serialized via protobuf and sent.

The response from the mesos master has the following headers:
{code}
HTTP/1.1 200 OK
Transfer-Encoding: chunked
Date: Wed, 30 Sep 2015 21:07:16 GMT
Content-Type: application/json
{code}
followed by 
{code}
\r\n\r\n6c\r\n104\n{"subscribed":{"framework_id":{"value":"20150930-103028-16777343-5050-11742-0028"}},"type":"SUBSCRIBED"}
{code}
The {{\r\n\r\n}} is expected for standard http bodies, how ever {{6c\r\n}} doesn't appear to be attached to anything. {{104}} is the correct length of the Subscribe events JSON.

What is this extra number and why is it there?

This is not the first time confusion has come up related to the wire format for the event stream from the new http api see [this|http://mail-archives.apache.org/mod_mbox/mesos-user/201508.mbox/%3C94D2C9E8-2FE8-4C11-B0D3-859DAC654313@me.com%3E] message from the mailing list.

In the [Design Doc|https://docs.google.com/document/d/1pnIY_HckimKNvpqhKRhbc9eSItWNFT-priXh_urR-T0/edit#] there is a statement that said 
{quote}
All subsequent events that are relevant to this framework  generated by Mesos are streamed on this connection. Master encodes each Event in RecordIO format, i.e., string representation of length of the event followed by JSON or binary Protobuf  (possibly compressed) encoded event. 
{quote}

There is no specification I've been able to find online that actually explains this format. The only reference I can find to it is some sample go code.



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