[exporter/file] Improving write performance speed

[MovieStoreGuy]

Description:
Using the library bufio to help improve overall performance with the exporter

Link to tracking Issue:
N/A

Testing:

I'ver included benchmarks to help verify improvements, on my local these are the expected changes:

BenchmarkWriter/buffered-discard-10         	67764800	        17.55 ns/op	      24 B/op	       1 allocs/op
BenchmarkWriter/raw-file-10                 	25841067	        46.40 ns/op	      72 B/op	       2 allocs/op
BenchmarkWriter/buffered-file-10            	74804418	        16.13 ns/op	      24 B/op	       1 allocs/op
BenchmarkWriter/discard-10                  	75218797	        15.92 ns/op	      24 B/op	       1 allocs/op

Documentation:

N/A, completely transparent to the user.

[runforesight]

Foresight Summary

    
Major Impacts

build-and-test-windows duration(5 seconds) has decreased 42 minutes 27 seconds compared to main branch avg(42 minutes 32 seconds).

View More Details

⭕  changelog workflow has finished in 4 seconds (2 minutes less than main branch avg.) and finished at 17th Jan, 2023.

---

Job	Failed Steps	Tests
changelog	-     🔗	N/A	See Details

---

⭕  build-and-test-windows workflow has finished in 5 seconds (42 minutes 27 seconds less than main branch avg.) and finished at 17th Jan, 2023.

---

Job	Failed Steps	Tests
windows-unittest-matrix	-     🔗	N/A	See Details
windows-unittest	-     🔗	N/A	See Details

---

✅  check-links workflow has finished in 41 seconds (57 seconds less than main branch avg.) and finished at 17th Jan, 2023.

---

Job	Failed Steps	Tests
changed files	-     🔗	N/A	See Details
check-links	-     🔗	N/A	See Details

---

✅  tracegen workflow has finished in 55 seconds (1 minute 19 seconds less than main branch avg.) and finished at 17th Jan, 2023.

---

Job	Failed Steps	Tests
build-dev	-     🔗	N/A	See Details
publish-latest	-     🔗	N/A	See Details
publish-stable	-     🔗	N/A	See Details

---

✅  telemetrygen workflow has finished in 58 seconds (1 minute 21 seconds less than main branch avg.) and finished at 17th Jan, 2023.

---

Job	Failed Steps	Tests
build-dev	-     🔗	N/A	See Details
publish-latest	-     🔗	N/A	See Details
publish-stable	-     🔗	N/A	See Details

---

 build-and-test workflow has finished in 16 minutes 37 seconds (31 minutes 9 seconds less than main branch avg.) and finished at 17th Jan, 2023.

---

Job	Failed Steps	Tests
unittest-matrix (1.19, internal)	N/A	✅ 662  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, internal)	N/A	✅ 662  ❌ 0  ⏭ 0    🔗	See Details
correctness-metrics	N/A	✅ 2  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, processor)	N/A	✅ 1488  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, extension)	N/A	✅ 528  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, extension)	N/A	✅ 528  ❌ 0  ⏭ 0    🔗	See Details
correctness-traces	N/A	✅ 17  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, processor)	N/A	✅ 1488  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-0)	N/A	✅ 2565  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, receiver-0)	N/A	✅ 2565  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, exporter)	N/A	✅ 2475  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, exporter)	N/A	✅ 2475  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, other)	N/A	✅ 4464  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-1)	N/A	✅ 1894  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, other)	N/A	✅ 4464  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, receiver-1)	N/A	✅ 1894  ❌ 0  ⏭ 0    🔗	See Details
integration-tests	N/A	✅ 55  ❌ 0  ⏭ 0    🔗	See Details

---

✅  load-tests workflow has finished in 7 minutes 46 seconds (6 minutes 26 seconds less than main branch avg.) and finished at 17th Jan, 2023.

---

Job	Failed Steps	Tests
loadtest (TestTraceAttributesProcessor)	-     🔗	✅ 3  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestIdleMode)	-     🔗	✅ 1  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetric10kDPS|TestMetricsFromFile)	-     🔗	✅ 6  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceNoBackend10kSPS|TestTrace1kSPSWithAttrs)	-     🔗	✅ 8  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceBallast1kSPSWithAttrs|TestTraceBallast1kSPSAddAttrs)	-     🔗	✅ 10  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetricResourceProcessor|TestTrace10kSPS)	-     🔗	✅ 12  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestBallastMemory|TestLog10kDPS)	-     🔗	✅ 19  ❌ 0  ⏭ 0    🔗	See Details
setup-environment	-     🔗	N/A	See Details

---

✅  prometheus-compliance-tests workflow has finished in 14 minutes 30 seconds (⚠️ 6 minutes 55 seconds more than main branch avg.) and finished at 17th Jan, 2023.

---

Job	Failed Steps	Tests
prometheus-compliance-tests	-     🔗	✅ 21  ❌ 0  ⏭ 0    🔗	See Details

---

🔎 See details on Foresight

^{*You can configure Foresight comments in your organization settings page.}

[MovieStoreGuy]

The latest benchmark results I have from the update are:

BenchmarkWriter/discard_10485760_bytes-10         	514807416	         2.222 ns/op	       0 B/op	       0 allocs/op
BenchmarkWriter/buffered-discard_10485760_bytes-10         	179711494	         6.596 ns/op	       0 B/op	       0 allocs/op
BenchmarkWriter/raw-file_10485760_bytes-10                 	39634153	        28.55 ns/op	      48 B/op	       1 allocs/op
BenchmarkWriter/buffered-file_10485760_bytes-10            	443848808	         2.717 ns/op	       0 B/op	       0 allocs/op
BenchmarkWriter/discard_104857600_bytes-10                 	539187712	         2.244 ns/op	       0 B/op	       0 allocs/op
BenchmarkWriter/buffered-discard_104857600_bytes-10        	182226061	         6.573 ns/op	       0 B/op	       0 allocs/op
BenchmarkWriter/raw-file_104857600_bytes-10                	37745956	        27.93 ns/op	      48 B/op	       1 allocs/op
BenchmarkWriter/buffered-file_104857600_bytes-10           	448611487	         2.686 ns/op	       0 B/op	       0 allocs/op
BenchmarkWriter/discard_1073741824_bytes-10                	541026325	         2.208 ns/op	       0 B/op	       0 allocs/op
BenchmarkWriter/buffered-discard_1073741824_bytes-10       	181645206	         6.629 ns/op	       0 B/op	       0 allocs/op
BenchmarkWriter/raw-file_1073741824_bytes-10               	39887326	        29.18 ns/op	      48 B/op	       1 allocs/op
BenchmarkWriter/buffered-file_1073741824_bytes-10          	443683308	         2.693 ns/op	       0 B/op	       0 allocs/op
BenchmarkWriter/discard_10737418240_bytes-10               	530066356	         2.216 ns/op	       0 B/op	       0 allocs/op
BenchmarkWriter/buffered-discard_10737418240_bytes-10      	182331368	         6.581 ns/op	       0 B/op	       0 allocs/op
BenchmarkWriter/raw-file_10737418240_bytes-10              	       1	3159734250 ns/op	       0 B/op	       0 allocs/op
BenchmarkWriter/buffered-file_10737418240_bytes-10         	       1	3254270750 ns/op	       0 B/op	       0 allocs/op

Which show an increased performance for small writes (bellow the 10MB) but when it is great than the internal buffer then it will end up as the same performance as the raw file.