ベンチマークでたまに失敗する

[ryota-sakamoto]

再現条件不明ですが、原因としてはCookieが消えているのが原因ぽいです。

成功: &{POST http://isubata.example.com/add_channel HTTP/1.1 1 1 map[User-Agent:[isucon7q-benchmarker] Cookie:[session=MTUyOTA0NDgxNHxEdi1CQkFFQ180SUFBUkFCRUFBQUl2LUNBQUVHYzNSeWFXNW5EQWtBQjNWelpYSmZhV1FGYVc1ME5qUUVCQUQtQWZ3PXwtgrgoTCGnZnXKdQEX56eigzk2e_HN7RL5sD33gPOepg==] Content-Type:[application/x-www-form-urlencoded]] {} 0x6c1360 93 [] false isubata.example.com map[] map[] <nil> map[]   <nil> <nil> <nil> 0xc424609440} <nil>
失敗: &{POST http://isubata.example.com/add_channel HTTP/1.1 1 1 map[User-Agent:[isucon7q-benchmarker] Content-Type:[application/x-www-form-urlencoded]] {} 0x6c1360 135 [] false isubata.example.com map[] map[] <nil> map[]   <nil> <nil> <nil> 0xc424c8faa0} Post http://isubata.example.com/add_channel: EOF

[isu7q-bench] 2018/06/15 15:34:24.248761 bench.go:491: {"job_id":"","ip_addrs":"localhost","pass":false,"score":0,"message":"負荷走行前のバリデーションに失敗しました。2018-06-15 15:34:24.24787555 +0900 JST m=+7.923937128 リクエストに失敗しました Post http://isubata.example.com/add_channel: EOF (POST /add_channel )","error":["2018-06-15 15:34:24.24787555 +0900 JST m=+7.923937128 リクエストに失敗しました Post http://isubata.example.com/add_channel: EOF (POST /add_channel )"],"log":null,"load_level":0,"start_time":"2018-06-15T15:34:16.801076066+09:00","end_time":"2018-06-15T15:34:24.2479395+09:00"}

エラー出てるのは以下の箇所になります。
(クッキー関係なかったです)

isucon7-qualify/bench/src/bench/scenario.go

Line 956 in 5cc8fe0

err = checker.Play(ctx, &CheckAction{

2018/06/15 17:37:49 [error] 27305#27305: *41767 readv() failed (104: Connection reset by peer) while reading upstream, client: ::1, server: isubata.example.com, request: "POST /profile HTTP/1.1", upstream: "http://127.0.0.1:5000/profile", host: "isubata.example.com"