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Httpx 5 second delay #3006

Closed
Closed
Httpx 5 second delay#3006

Description

@dhensen
dhensen
opened on Dec 15, 2023

Hi all,

Httpx version: I'm still on httpx 24.1 because I had to downgrade because of #2929

Expectation:

I expect my http calls not to get delayed by a constant 5 seconds.

Actual:

My http calls are delayed with a constant 5 seconds, plus I get DNS related logs from dockerd.

Long story

I noticed in my system logs weird docker dns issues:

Click to see logs 
Dec 15 22:53:44 my-hostname dockerd[1601]: time="2023-12-15T22:53:44.285539223+01:00" level=error msg="[resolver] failed to query DNS server: 192.168.50.1:53, query: ;gameboy2023.my-site-ommitted.nl.\tIN\t AAAA" error="read udp 172.28.0.3:53713->192.168.50.1:53: i/o timeout"
Dec 15 22:53:44 my-hostname dockerd[1601]: time="2023-12-15T22:53:44.296076826+01:00" level=error msg="[resolver] failed to query DNS server: 1.1.1.1:53, query: ;ht.my-site-ommitted.nl.\tIN\t A" error="read udp 172.28.0.105:43077->1.1.1.1:53: i/o timeout"
Dec 15 22:53:44 my-hostname dockerd[1601]: time="2023-12-15T22:53:44.296120525+01:00" level=error msg="[resolver] failed to query DNS server: 1.1.1.1:53, query: ;ht.my-site-ommitted.nl.\tIN\t AAAA" error="read udp 172.28.0.105:60254->1.1.1.1:53: i/o timeout"
Dec 15 22:53:44 my-hostname dockerd[1601]: time="2023-12-15T22:53:44.305453453+01:00" level=error msg="[resolver] failed to query DNS server: 192.168.50.1:53, query: ;theultimatenerdconf.my-site-ommitted.nl.\tIN\t AAAA" error="read udp 172.28.0.3:49108->192.168.50.1:53: i/o timeout"
Dec 15 22:53:48 my-hostname dockerd[1601]: time="2023-12-15T22:53:48.364826590+01:00" level=error msg="[resolver] failed to query DNS server: 192.168.50.1:53, query: ;zongaatonder.my-site-ommitted.nl.\tIN\t AAAA" error="read udp 172.28.0.3:48923->192.168.50.1:53: i/o timeout"
Dec 15 22:53:48 my-hostname dockerd[1601]: time="2023-12-15T22:53:48.366090453+01:00" level=error msg="[resolver] failed to query DNS server: 192.168.50.1:53, query: ;top10movies.my-site-ommitted.nl.\tIN\t AAAA" error="read udp 172.28.0.3:56201->192.168.50.1:53: i/o timeout"
Dec 15 22:53:52 my-hostname dockerd[1601]: time="2023-12-15T22:53:52.496770882+01:00" level=error msg="[resolver] failed to query DNS server: 192.168.50.1:53, query: ;gameboy2023.my-site-ommitted.nl.\tIN\t AAAA" error="read udp 172.28.0.3:49707->192.168.50.1:53: i/o timeout"
Dec 15 22:53:52 my-hostname dockerd[1601]: time="2023-12-15T22:53:52.508179669+01:00" level=error msg="[resolver] failed to query DNS server: 192.168.50.1:53, query: ;ergotherapie2.my-site-ommitted.nl.\tIN\t AAAA" error="read udp 172.28.0.3:51178->192.168.50.1:53: i/o timeout"
Dec 15 22:53:56 my-hostname dockerd[1601]: time="2023-12-15T22:53:56.515096544+01:00" level=error msg="[resolver] failed to query DNS server: 192.168.50.1:53, query: ;theultimatenerdconf.my-site-ommitted.nl.\tIN\t AAAA" error="read udp 172.28.0.3:33374->192.168.50.1:53: i/o timeout"
Dec 15 22:53:56 my-hostname dockerd[1601]: time="2023-12-15T22:53:56.590845767+01:00" level=error msg="[resolver] failed to query DNS server: 192.168.50.1:53, query: ;zongaatonder.my-site-ommitted.nl.\tIN\t AAAA" error="read udp 172.28.0.3:60863->192.168.50.1:53: i/o timeout"

It always used to happen when I was doing health probes on about a 100 websites asynchronous as the same moment. I discovered this issue 2 weeks ago, but today got the time to dig into this. I suspected it was httpx, but I had no proof other than running into long timeouts for http calls to sites that were supposed to be fast.

I also ran while true; do dig "https://$(tr -dc 'a-zA-Z0-9' </dev/urandom | head -c 10).my-site-ommittedd.nl"; done on my host and inside docker on that same host to see if there is a docker related DNS issue. Running this large amount of DNS lookups do not result into the same system logs I saw from when my api was doing lookups using httpx. So httpx became my prime suspect.

I then changed up my implementation to retrieve all my site urls (there are a little over 100 in db) and make it so I can swap httpx for aiohttp (I'm sorry, I can image reading this hurts 💔 )

With aiohttp my problem disappears and I get normal response times. All 106 response times are below 1.2 seconds, with the lowest being 0.07.

With httpx about 64 out of 106 come with the 5.xx seconds (out of 106 calls only 1 fails, so no TimeoutException) AND system logs appear. Now I think those logs are trying to tell that the dns query wasn't read, hence the i/o timeout at the end of each log line.

So my bug is about what is httpx doing with regards to DNS? What could lead to the issues I'm describing.

This is an excerpt of my code (based on Sanic):

async def get_all_site_urls(conn):
    async with conn.cursor(aiomysql.DictCursor) as cur:
        await cur.execute("SELECT site_url FROM site_config")
        site_configs = await cur.fetchall()
        return [x["site_url"] for x in site_configs]


@app.get("/all_sites_health/<client_type>", name="get all sites health")
async def get_all_sites_health(request, client_type: str):
    site_urls = await get_all_site_urls(request.ctx.conn)
    # TODO set better timeouts on teh http clients, use defaults for now
    if client_type == "aiohttp":
        http_client_cls = aiohttp.ClientSession
        # timeout 5 seconds per conn/read/write/pool
    else:
        http_client_cls = httpx.AsyncClient
        # timeout 300 seconds by default

    async with http_client_cls() as http_client:
        tasks = []
        for url in site_urls:
            task = asyncio.create_task(perform_get_probe(http_client, url))
            tasks.append(task)
        results = await asyncio.gather(*tasks)
    return response.json({"res": results})


async def perform_get_probe(http_client, site_url: str):
    start = perf_counter()
    try:
        res = await http_client.get(site_url)
        try:
            healthy = res.status_code == 200  # httpx
        except AttributeError:
            healthy = res.status == 200  # aiohttp
    except (httpx.RequestError, aiohttp.ClientError):
        healthy = False

    duration = perf_counter() - start
    return site_url, healthy, duration

Activity

  1. dhensen commented on Dec 15, 2023

    @dhensen
    dhensen
    on Dec 15, 2023
    Author
    Click for httpx response 
    {
  "res": [
    [
      "https://site-ommitted.com",
      true,
      0.08230855100555345
    ],
    [
      "https://site-ommitted.com",
      true,
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    [
      "https://site-ommitted.com",
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    [
      "https://site-ommitted.com",
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    [
      "https://site-ommitted.com",
      true,
      0.13690642398432828
    ],
    [
      "https://site-ommitted.com",
      true,
      0.0974578780005686
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    [
      "https://site-ommitted.com",
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    [
      "https://site-ommitted.com",
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    [
      "https://site-ommitted.com",
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    [
      "https://site-ommitted.com",
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      "https://site-ommitted.com",
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      0.16832476400304586
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    [
      "https://site-ommitted.com",
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      "https://site-ommitted.com",
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      "https://site-ommitted.com",
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      "https://site-ommitted.com",
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      "https://site-ommitted.com",
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      "https://site-ommitted.com",
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      "https://site-ommitted.com",
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    [
      "https://site-ommitted.com",
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      "https://site-ommitted.com",
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      "https://site-ommitted.com",
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    [
      "http://localhost:8084",
      false,
      5.062833144009346
    ]
  ]
}
    Click for aiohttp response 
    {
  "res": [
    [
      "https://site-ommitted.com",
      true,
      0.10253822198137641
    ],
    [
      "https://site-ommitted.com",
      true,
      0.09174630098277703
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    [
      "http://localhost:8084",
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  ]
}

    Note: all the way at the bottom for both responses you see I called localhost, that is the only call that failed. In the aiohttp I see expected response times. In the httpx response I see a lot of response times at 5 seconds in combination with the docker dns logs. For privacy reasons I ommitted al site urls, but they are all unique. In this case it concerns wildcard subdomain if that is helpful information.

  2. encode
    locked and limited conversation to collaborators on Dec 21, 2023
  3. lovelydinosaur
    converted this issue into a discussion #3019 on Dec 21, 2023
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