111 lines
7.8 KiB
Markdown
111 lines
7.8 KiB
Markdown
# Liveness issues
|
|
|
|
We know that some people reported having timeouts when putting some load on their Garage cluster.
|
|
On our production cluster that runs without pressure, we don't really observe this behaviour.
|
|
|
|
But when I wanted to start a benchmark created by Minio developers, I hit the same limit.
|
|
So I wanted to reproduce this behavior in a more controlled environment.
|
|
|
|
## Reproducing the error in mknet
|
|
|
|
I used mknet to emulate a simple network with close to zero latency but with a very small bandwidth: 1Mbit/s. The idea is that the network will be the bottleneck, but not the CPU, the memory or the disk, even on my low powered laptop.
|
|
|
|
After a while, we quickly observe that the cluster is not reacting very well:
|
|
|
|
```
|
|
[nix-shell:/home/quentin/Documents/dev/deuxfleurs/mknet]# warp get --host=[fc00:9a7a:9e::1]:3900 --obj.size 100MiB --obj.randsize --duration=10m --concurrent 8 --objects 200 --access-key=GKc1e16da48142bdb95d98a4e4 --secret-key=c4ef5d5f7ee24ccae12a98912bf5b1fda28120a7e3a8f90cb3710c8683478b31
|
|
Creating Bucket "warp-benchmark-bucket"...Element { tag_name: {http://s3.amazonaws.com/doc/2006-03-01/}LocationConstraint, attributes: [], namespaces: [Namespace { name: None, uri: "http://s3.amazonaws.com/doc/2006-03-01/" }] }
|
|
warp: <ERROR> upload error: Internal error: Could not reach quorum of 2. 1 of 3 request succeeded, others returned errors: ["Timeout", "Timeout"]
|
|
warp: <ERROR> upload error: Internal error: Could not reach quorum of 2. 1 of 3 request succeeded, others returned errors: ["Netapp error: Not connected: 3cb7ed98f7c66a55", "Netapp error: Not connected: 92c7fb74ed89f289"]
|
|
warp: <ERROR> upload error: Put "http://[fc00:9a7a:9e::1]:3900/warp-benchmark-bucket/xVdzjy23/1.KximayVLlhLwfE5f.rnd": dial tcp [fc00:9a7a:9e::1]:3900: i/o timeout
|
|
warp: <ERROR> upload error: Put "http://[fc00:9a7a:9e::1]:3900/warp-benchmark-bucket/N4zQvKhs/1.XkkO6DJ%28hVpGIrMj.rnd": dial tcp [fc00:9a7a:9e::1]:3900: i/o timeout
|
|
warp: <ERROR> upload error: Internal error: Could not reach quorum of 2. 1 of 3 request succeeded, others returned errors: ["Timeout", "Timeout"]
|
|
warp: <ERROR> upload error: Internal error: Could not reach quorum of 2. 1 of 3 request succeeded, others returned errors: ["Netapp error: Not connected: 3cb7ed98f7c66a55", "Netapp error: Not connected: 92c7fb74ed89f289"]
|
|
warp: <ERROR> upload error: Put "http://[fc00:9a7a:9e::1]:3900/warp-benchmark-bucket/GQrsevhN/1.7hglGIP%28mXTJMgFE.rnd": read tcp [fc00:9a7a:9e:ffff:ffff:ffff:ffff:ffff]:57008->[fc00:9a7a:9e::1]:3900: read: connection reset by peer
|
|
|
|
warp: <ERROR> Error preparing server: upload error: Internal error: Could not reach quorum of 2. 1 of 3 request succeeded, others returned errors: ["Timeout", "Timeout"].
|
|
```
|
|
|
|
We observe many different types of error that I categorize as follow:
|
|
- [RPC] Timeout quorum errors, they are probably generated by a ping between nodes
|
|
- [RPC] Not connected error, after a timeout, a reconnection is not triggered directly
|
|
- [S3 Gateway] The gateway took to much time to answer and a timeout was triggered in the client
|
|
- [S3 Gateway] The S3 gateway closes the TCP connection before answering
|
|
|
|
As a first conclusion, we started to clearly reduce the scope of the problem by identifying that this undesirable behavior is triggered by a network bottleneck.
|
|
|
|
Looking at Garage logs, we see that:
|
|
- node1, which is our S3 gateway, has many quorum errors / netapp not connected errors, which are the same than the ones reported earlier
|
|
- node2 and node3 which are only used as storage nodes, have no error/warn in their logs
|
|
|
|
It starts to really look like a congestion control/control flow error/scheduler issue: our S3 gateway seems to receive more data than it can send over the network, which in turn trigger timeouts, that trigger disconnect, and breaks everything.
|
|
|
|
## Write a custom client exhibiting the issue
|
|
|
|
We know how to trigger the issue with `warp`, Minio's benchmark tool but we don't yet understand well what kind of load it puts on the cluster except that it sends concurrently Multipart and PutObject requests concurrently. So, before investigating the issue more in depth, we want to know:
|
|
- If a single large PUT request can trigger this issue or not?
|
|
- How many parallel requests are needed to trigger this issue?
|
|
- Does Multipart transfer are more impacted by this issue?
|
|
|
|
To get answer to our questions, we will write a specific benchmark.
|
|
Named s3concurrent, it is available here: https://git.deuxfleurs.fr/quentin/s3concurrent
|
|
The benchmark starts by sending 1 file, then 2 files concurrently,
|
|
then 3, then 4, up to 16 (this is hardcoded for now).
|
|
|
|
When ran on our mknet cluster, we start triggering issues as soon as we send 2 files at once:
|
|
|
|
```
|
|
$ ./s3concurrent
|
|
2022/08/11 20:35:28 created bucket 3ffd6798-bdab-4218-b6d0-973a07e46ea9
|
|
2022/08/11 20:35:28 start concurrent loop with 1 coroutines
|
|
2022/08/11 20:35:55 done, 1 coroutines returned
|
|
2022/08/11 20:35:55 start concurrent loop with 2 coroutines
|
|
2022/08/11 20:36:34 1/2 failed with Internal error: Could not reach quorum of 2. 1 of 3 request succeeded, others returned errors: ["Timeout", "Timeout"]
|
|
2022/08/11 20:36:37 done, 2 coroutines returned
|
|
2022/08/11 20:36:37 start concurrent loop with 3 coroutines
|
|
2022/08/11 20:37:13 1/3 failed with Internal error: Could not reach quorum of 2. 1 of 3 request succeeded, others returned errors: ["Netapp error: Not connected: 92c7fb74ed89f289", "Netapp error: Not connected: 3cb7ed98f7c66a55"]
|
|
2022/08/11 20:37:51 2/3 failed with Internal error: Could not reach quorum of 2. 1 of 3 request succeeded, others returned errors: ["Netapp error: Not connected: 92c7fb74ed89f289", "Netapp error: Not connected: 3cb7ed98f7c66a55"]
|
|
2022/08/11 20:37:51 3/3 failed with Internal error: Could not reach quorum of 2. 1 of 3 request succeeded, others returned errors: ["Netapp error: Not connected: 92c7fb74ed89f289", "Netapp error: Not connected: 3cb7ed98f7c66a55"]
|
|
2022/08/11 20:37:51 done, 3 coroutines returned
|
|
2022/08/11 20:37:51 start concurrent loop with 4 coroutines
|
|
```
|
|
|
|
## Overview of available tools to observe Garage internals
|
|
|
|
Even if I have some theory on what is going wrong, I want to collect as many information as possible before making hypothesis,
|
|
adding specific debug hooks, and so on. Hopefully, we have at least 3 different tools in Garage to gather information about its internals:
|
|
- Prometheus telemetry
|
|
- Opentelemetry traces
|
|
- Tokio traces (not sure)
|
|
|
|
### Prometheus
|
|
|
|
Nothing very interesting is returned by Prometheus telemetry, except we returned 503 and 500 errors:
|
|
|
|
```
|
|
# HELP api_s3_error_counter Number of API calls to the various S3 API endpoints that resulted in errors
|
|
# TYPE api_s3_error_counter counter
|
|
api_s3_error_counter{api_endpoint="PutObject",status_code="500"} 3
|
|
api_s3_error_counter{api_endpoint="PutObject",status_code="503"} 2
|
|
# HELP api_s3_request_counter Number of API calls to the various S3 API endpoints
|
|
# TYPE api_s3_request_counter counter
|
|
api_s3_request_counter{api_endpoint="CreateBucket"} 1
|
|
api_s3_request_counter{api_endpoint="PutObject"} 6
|
|
# HELP api_s3_request_duration Duration of API calls to the various S3 API endpoints
|
|
# TYPE api_s3_request_duration histogram
|
|
api_s3_request_duration_bucket{api_endpoint="CreateBucket",le="0.5"} 1
|
|
api_s3_request_duration_bucket{api_endpoint="CreateBucket",le="0.9"} 1
|
|
api_s3_request_duration_bucket{api_endpoint="CreateBucket",le="0.99"} 1
|
|
api_s3_request_duration_bucket{api_endpoint="CreateBucket",le="+Inf"} 1
|
|
api_s3_request_duration_sum{api_endpoint="CreateBucket"} 0.109302301
|
|
api_s3_request_duration_count{api_endpoint="CreateBucket"} 1
|
|
api_s3_request_duration_bucket{api_endpoint="PutObject",le="0.5"} 0
|
|
api_s3_request_duration_bucket{api_endpoint="PutObject",le="0.9"} 0
|
|
api_s3_request_duration_bucket{api_endpoint="PutObject",le="0.99"} 0
|
|
api_s3_request_duration_bucket{api_endpoint="PutObject",le="+Inf"} 6
|
|
api_s3_request_duration_sum{api_endpoint="PutObject"} 147.68400154399998
|
|
api_s3_request_duration_count{api_endpoint="PutObject"} 6
|
|
```
|
|
|
|
|
|
|