Simultaneous channel creates can cause a 409

[chriskessel]

If I have 2 threads try to create a channel simultaneously, sometimes one of them will get back a 409.

It's been easiest to cause in Java, but here's the error, and following that a simple bash script that caused it to happen once every few runs.

< HTTP/1.1 409 Conflict < Date: Tue, 13 Mar 2018 17:31:21 GMT < Content-Type: application/json

• Server Hub/2018.01.09.389.master is not blacklisted < Server: Hub/2018.01.09.389.master < Access-Control-Allow-Origin: * < Access-Control-Allow-Headers: origin, content-type, accept, authorization < Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS, HEAD < Vary: Accept-Encoding < Transfer-Encoding: chunked < { [data not shown]

100 121 0 48 100 73 201 305 --:--:-- --:--:-- --:--:-- 306

• Connection #0 to host hub.iad.staging.flightstats.io left intact {"error": "Channel name crktest already exists"}*

---

!/usr/bin/env bash

set -x

curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & curl -v -X PUT --header "Content-Type: application/json" --data '{"owner":"foo", "name":"crktest", "description": "foobar", "ttlDays":"1"}' "http://hub.iad.staging.flightstats.io/channel/crktest" >> foo.txt 2>&1 & sleep 10