Revert "Reduce the chunk size for writing tracevalues and postings en…

…tries during ingestions"

This reverts commit c06913b.

Reason for revert: The timeout was caused due to parent context which has now been fixed. This change should no longer be necessary.

Original change's description:
> Reduce the chunk size for writing tracevalues and postings entries during ingestions
>
> - These determine the number of rows written in a single INSERT statement during ingestion.
> - Seeing timeouts occuring in the spanner instances for these statements, so trying to reduce the chunk size to see if it helps.
>
> Change-Id: I5fafb1870ac79050375aabcfaf57e83ff1088d4f
> Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/932582
> Reviewed-by: Farid (Mojtaba) Faridzad <faridzad@google.com>
> Commit-Queue: Ashwin Verleker <ashwinpv@google.com>

Change-Id: I4e05305efe9127c907da69f3b85949d5823d7450
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/932636
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Ashwin Verleker <ashwinpv@google.com>

perf/go/tracestore/sqltracestore/sqltracestore.go

@@ -185,8 +185,8 @@ const (
 	// data. Note that values over 200 caused the insert rate to drop precipitously,
 	// going from 20,000 qps with a batch size of 100 down to 400 qps with a batch
 	// size of 200.
-	writeTracesValuesChunkSize    = 500
-	writeTracesPostingsChunkSize  = 500
+	writeTracesValuesChunkSize    = 1000
+	writeTracesPostingsChunkSize  = 1000
 	writeTracesParamSetsChunkSize = 100
 
 	// See writeTracesChunkSize.