lhotari commented on PR #24623:
URL: https://github.com/apache/pulsar/pull/24623#issuecomment-3210050682
I have updated the test to be more realistic. There's now a way to simulate
that the cached entries are 8kB of size. I added a required internal interface
`EntryLengthFunction` and integration in the `PulsarTestContext` framework to
support this.
The test now tests with 10 topic partitions, producer throughput of
50000msg/s and with 250MB cache size.
PIP430 implementation is again superior to others, with the cache hit
percentage of 98.4%. It turns out that the previous default cache strategy
(76.85%) beats cacheEvictionByMarkDeletedPosition (59.97%) and PR12258 (52.09%)
when the cache size is the main constraint.
```shell
❯ ENABLE_MANUAL_TEST=true NETTY_LEAK_DETECTION=off mvn -pl pulsar-broker
test -Dtest=BrokerEntryCacheRollingRestartTest
...
{ cat pulsar-broker/target/rolling_restarts_result_header.txt; cat
pulsar-broker/target/rolling_restarts_result_*.csv } | duckdb -markdown -c
"select description, round(avg(hits), 2), round(avg(misses),2), avg(produced),
avg(consumed), avg(bk_reads), avg(bk_read_entries) from read_csv('/dev/stdin')
group by description order by 3"
```
| description | round(avg(hits), 2) |
round(avg(misses), 2) | avg(produced) | avg(consumed) | avg(bk_reads) |
avg(bk_read_entries) |
|------------------------------------|--------------------:|----------------------:|--------------:|--------------:|--------------:|---------------------:|
| PIP430 | 98.6 | 1.4
| 1549271.0 | 15504486.2 | 2351.0 | 216622.0 |
| PIP430disabled | 76.85 | 23.15
| 1549220.8 | 15515415.4 | 60024.2 | 3592180.0 |
| cacheEvictionByMarkDeletedPosition | 59.97 | 40.03
| 1548167.6 | 15514712.0 | 78794.2 | 6208959.4 |
| PR12258 | 52.09 | 47.91
| 1518004.4 | 15213489.2 | 76129.4 | 7280525.8 |
details:
```shell
❯ { cat pulsar-broker/target/rolling_restarts_result_header.txt; cat
pulsar-broker/target/rolling_restarts_result_*.csv } | duckdb -markdown -c
"select * from read_csv('/dev/stdin') "
```
| description | produced | consumed | consumers |
bk_reads | bk_read_entries | hits | misses | restarts | ts
|
|------------------------------------|---------:|---------:|----------:|---------:|----------------:|------:|-------:|---------:|-------------------------|
| PR12258 | 1532416 | 15361949 | 10 |
66934 | 6394537 | 58.37 | 41.63 | 3 | 2025-08-21
10:37:53.371 |
| PR12258 | 1549702 | 15531430 | 10 |
71797 | 6764940 | 56.44 | 43.56 | 3 | 2025-08-21
10:38:26.935 |
| PR12258 | 1528875 | 15308816 | 10 |
80130 | 7702434 | 49.69 | 50.31 | 3 | 2025-08-21
10:39:00.267 |
| PR12258 | 1505071 | 15088036 | 10 |
84316 | 8105838 | 46.28 | 53.72 | 3 | 2025-08-21
10:39:33.859 |
| PR12258 | 1473958 | 14777215 | 10 |
77470 | 7434880 | 49.69 | 50.31 | 3 | 2025-08-21
10:40:08.021 |
| cacheEvictionByMarkDeletedPosition | 1544173 | 15475687 | 10 |
120594 | 9723958 | 37.17 | 62.83 | 3 | 2025-08-21
10:40:50.853 |
| cacheEvictionByMarkDeletedPosition | 1549344 | 15526299 | 10 |
79955 | 6216643 | 59.96 | 40.04 | 3 | 2025-08-21
10:41:23.889 |
| cacheEvictionByMarkDeletedPosition | 1549034 | 15523969 | 10 |
59132 | 4410078 | 71.59 | 28.41 | 3 | 2025-08-21
10:41:56.936 |
| cacheEvictionByMarkDeletedPosition | 1548770 | 15520337 | 10 |
69089 | 5418665 | 65.09 | 34.91 | 3 | 2025-08-21
10:42:30.026 |
| cacheEvictionByMarkDeletedPosition | 1549517 | 15527268 | 10 |
65201 | 5275453 | 66.02 | 33.98 | 3 | 2025-08-21
10:43:03.221 |
| PIP430disabled | 1549267 | 15520017 | 10 |
187155 | 10236574 | 34.04 | 65.96 | 3 | 2025-08-21
10:43:46.284 |
| PIP430disabled | 1549413 | 15511496 | 10 |
23154 | 1573744 | 89.85 | 10.15 | 3 | 2025-08-21
10:44:19.389 |
| PIP430disabled | 1549397 | 15507742 | 10 |
39678 | 2336104 | 84.94 | 15.06 | 3 | 2025-08-21
10:44:52.413 |
| PIP430disabled | 1548853 | 15515587 | 10 |
19009 | 1490084 | 90.4 | 9.6 | 3 | 2025-08-21
10:45:25.498 |
| PIP430disabled | 1549174 | 15522235 | 10 |
31125 | 2324394 | 85.03 | 14.97 | 3 | 2025-08-21
10:45:58.584 |
| PIP430 | 1549565 | 15507910 | 10 |
1113 | 99113 | 99.36 | 0.64 | 3 | 2025-08-21
10:46:41.442 |
| PIP430 | 1549340 | 15501783 | 10 |
2674 | 247181 | 98.41 | 1.59 | 3 | 2025-08-21
10:47:14.526 |
| PIP430 | 1549189 | 15501577 | 10 |
2349 | 212708 | 98.63 | 1.37 | 3 | 2025-08-21
10:47:47.508 |
| PIP430 | 1549287 | 15501902 | 10 |
2750 | 256654 | 98.34 | 1.66 | 3 | 2025-08-21
10:48:20.539 |
| PIP430 | 1548974 | 15509259 | 10 |
2869 | 267454 | 98.28 | 1.72 | 3 | 2025-08-21
10:48:53.543 |
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