Uses custom json-iter decoder for log entries. #3163
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Previously we were using json.Unmarshal for each line. However json-iter uses a Pool for each calls and I believe this can cause to increase memory usage. For each line we would put in a pool the iterator to re-use it, once put in a pool, the last data is retained, since we handle millions of lines, this can cause problem, using a custom extensions, keep using a pool but at the root object only, not for each line. On top of that we're going to process that json payload 50% faster. ``` ❯ benchcmp before.txt after.txt2 benchmark old ns/op new ns/op delta Benchmark_DecodePushRequest-16 13509236 6677037 -50.57% benchmark old allocs new allocs delta Benchmark_DecodePushRequest-16 106149 38719 -63.52% benchmark old bytes new bytes delta Benchmark_DecodePushRequest-16 10350362 5222989 -49.54% ``` Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>
Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>
Codecov Report
@@ Coverage Diff @@
## master #3163 +/- ##
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- Coverage 63.05% 62.90% -0.16%
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Files 188 189 +1
Lines 16218 16249 +31
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- Hits 10226 10221 -5
- Misses 5051 5090 +39
+ Partials 941 938 -3
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@mizeng You raised an issue I believe around json and distributor memory, I think this might greatly help if not fix it. |
owen-d
approved these changes
Jan 15, 2021
I used to but I don't anymore, it's also faster and less memory but it was less of a problem. |
cyriltovena
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Jan 21, 2021
Introduce a bug by removing the default marshalling (grafana#3163) but the tail api was using the default json. This fixes it by forcing the usage of jsoniter package. Added a missing test so that it doesn't happen again. Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>
owen-d
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Jan 22, 2021
Introduce a bug by removing the default marshalling (#3163) but the tail api was using the default json. This fixes it by forcing the usage of jsoniter package. Added a missing test so that it doesn't happen again. Signed-off-by: Cyril Tovena <cyril.tovena@gmail.com>
cyriltovena
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Nov 4, 2022
**What this PR does / why we need it**: This allows to reuse stream memory allocations between responses. Related #3163 but this time this is for the encoding. ``` ❯ benchstat before.txt after.txt name old time/op new time/op delta _Encode-16 29.2µs ±12% 25.2µs ± 1% -13.85% (p=0.016 n=5+4) name old alloc/op new alloc/op delta _Encode-16 24.9kB ± 6% 16.4kB ± 8% -34.20% (p=0.008 n=5+5) name old allocs/op new allocs/op delta _Encode-16 145 ± 0% 129 ± 0% -11.03% (p=0.008 n=5+5) ```
lxwzy
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Nov 7, 2022
**What this PR does / why we need it**: This allows to reuse stream memory allocations between responses. Related grafana#3163 but this time this is for the encoding. ``` ❯ benchstat before.txt after.txt name old time/op new time/op delta _Encode-16 29.2µs ±12% 25.2µs ± 1% -13.85% (p=0.016 n=5+4) name old alloc/op new alloc/op delta _Encode-16 24.9kB ± 6% 16.4kB ± 8% -34.20% (p=0.008 n=5+5) name old allocs/op new allocs/op delta _Encode-16 145 ± 0% 129 ± 0% -11.03% (p=0.008 n=5+5) ```
changhyuni
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Nov 8, 2022
**What this PR does / why we need it**: This allows to reuse stream memory allocations between responses. Related grafana#3163 but this time this is for the encoding. ``` ❯ benchstat before.txt after.txt name old time/op new time/op delta _Encode-16 29.2µs ±12% 25.2µs ± 1% -13.85% (p=0.016 n=5+4) name old alloc/op new alloc/op delta _Encode-16 24.9kB ± 6% 16.4kB ± 8% -34.20% (p=0.008 n=5+5) name old allocs/op new allocs/op delta _Encode-16 145 ± 0% 129 ± 0% -11.03% (p=0.008 n=5+5) ```
Abuelodelanada
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Dec 1, 2022
**What this PR does / why we need it**: This allows to reuse stream memory allocations between responses. Related grafana#3163 but this time this is for the encoding. ``` ❯ benchstat before.txt after.txt name old time/op new time/op delta _Encode-16 29.2µs ±12% 25.2µs ± 1% -13.85% (p=0.016 n=5+4) name old alloc/op new alloc/op delta _Encode-16 24.9kB ± 6% 16.4kB ± 8% -34.20% (p=0.008 n=5+5) name old allocs/op new allocs/op delta _Encode-16 145 ± 0% 129 ± 0% -11.03% (p=0.008 n=5+5) ```
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Previously we were using json.Unmarshal for each line. However json-iter uses a Pool for each calls and I believe this can cause to increase memory usage.
For each line we would put in a pool the iterator to re-use it, once put in a pool, the last data is retained, since we handle millions of lines, this can cause problem, using a custom extensions, keep using a pool but at the root object only, not for each line.
On top of that we're going to process that json payload 50% faster.
Signed-off-by: Cyril Tovena cyril.tovena@gmail.com
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