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jepsen: updated results, confirming that task3 works

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Alex Auvolat
2023-12-14 16:23:48 +01:00
parent 92dd2bbe15
commit fa9247f11b
12 changed files with 96 additions and 31 deletions
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script/jepsen.garage/README.md
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@@ -7,29 +7,19 @@ Jepsen checking of Garage consistency properties.
Requirements:
- vagrant
- VirtualBox, configured so that nodes can take an IP in a private network `192.168.56.0/24`
- VirtualBox, configured so that nodes can take an IP in a private network `192.168.56.0/24` (it's the default)
- a user that can create VirtualBox VMs
- leiningen
- gnuplot
Set up VMs:
Set up VMs before running tests:
```
vagrant up
```
Run tests (this one should fail):
Run tests: see commands below.
```
lein run test --nodes-file nodes.vagrant --time-limit 64 --concurrency 50 --rate 50 --workload reg
```
These ones are working:
```
lein run test --nodes-file nodes.vagrant --time-limit 64 --rate 50 --concurrency 50 --workload set1
lein run test --nodes-file nodes.vagrant --time-limit 64 --rate 50 --concurrency 50 --workload set2
```
## Results
@@ -73,16 +63,19 @@ Results with timestamp patch (`--patch tsfix2`):
Example of a failed run: `garage reg2/20231024T120806.899+0200`.
This is the failure mode we are looking for and trying to fix for NLnet task 3.
- Changes brought by NLnet task 3 code (commit 707442f5de):
no failures with `--scenario r` (0 of 10 runs), `--scenario pr` (0 of 10 runs),
Results with NLnet task 3 code (commit 707442f5de, `--patch task3a`):
- No failures with `--scenario r` (0 of 10 runs), `--scenario pr` (0 of 10 runs),
`--scenario cpr` (0 of 10 runs) and `--scenario dpr` (0 of 10 runs).
- Same with `--patch task3c` (commit `0041b013`, the final version).
### Set, basic test (write some items, then read)
Command: `lein run test --nodes-file nodes.vagrant --time-limit 60 --rate 200 --concurrency 200 --workload set1 --ops-per-key 100 --patch tsfix2`
Command: `lein run test --nodes-file nodes.vagrant --time-limit 60 --rate 200 --concurrency 200 --workload set1 --ops-per-key 100`
Results:
Results without NLnet task3 code (`--patch tsfix2`):
- For now, no failures with clock-scramble nemesis + partition nemesis -> TODO long test run
@@ -90,15 +83,22 @@ Results:
- **Fails with the partition + layout reconfiguration nemesis** (`--scenario pr`).
Example of a failed run: `garage set1/20231024T172214.488+0200` (1 failure in 4 runs).
TODO: investigate.
This is the failure mode we are looking for and trying to fix for NLnet task 3.
Results with NLnet task 3 code (commit 707442f5de, `--patch task3a`):
- The tests are buggy and often result in an "unknown" validity status, which
is caused by some requests not returning results during network partitions or
other nemesis-induced broken cluster states. However, when the tests were
able to finish, there were no failures with scenarios `r`, `pr`, `cpr`,
`dpr`.
### Set, continuous test (interspersed reads and writes)
Command: `lein run test --nodes-file nodes.vagrant --time-limit 60 --rate 100 --concurrency 100 --workload set2 --ops-per-key 100 --patch tsfix2`
Command: `lein run test --nodes-file nodes.vagrant --time-limit 60 --rate 100 --concurrency 100 --workload set2 --ops-per-key 100`
Results:
Results without NLnet task3 code (`--patch tsfix2`):
- No failures with clock-scramble nemesis + db nemesis + partition nemesis (`--scenario cdp`) (0 failures in 10 runs).
@@ -106,17 +106,26 @@ Results:
Example of a failed run: `garage set2/20231025T141940.198+0200` (10 failures in 10 runs).
This is the failure mode we are looking for and trying to fix for NLnet task 3.
- Changes brought by NLnet task 3 code (commit 707442f5de):
no failures with `--scenario r` (0 of 10 runs), `--scenario pr` (0 of 10 runs).
Results with NLnet task3 code (commit 707442f5de, `--patch task3a`):
- No failures with `--scenario r` (0 of 10 runs), `--scenario pr` (0 of 10 runs),
`--scenario cpr` (0 of 10 runs) and `--scenario dpr` (0 of 10 runs).
- Same with `--patch task3c` (commit `0041b013`, the final version).
## NLnet task 3 final results
- With code from task3 (`--patch task3c`): [reg2 and set2](results/Results-2023-12-13-task3c.png), [set1](results/Results-2023-12-14-task3-set1.png).
- Without (`--patch tsfix2`): [reg2 and set2](results/Results-2023-12-13-tsfix2.png), set1 TBD.
## Investigating (and fixing) errors
### Segfaults
They are due to the download being interrupted in the middle (^C during first launch on clean VMs), the `garage` binary is truncated.
Add `:force?` to the `cached-wget!` call in `daemon.clj` to re-download the binary.
Add `:force?` to the `cached-wget!` call in `daemon.clj` to re-download the binary,
or restar the VMs to clear temporary files.
### In `jepsen.garage`: prefix wierdness