SendBatch: Don't start goroutines #232
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Codecov ReportPatch coverage:
Additional details and impacted files@@ Coverage Diff @@
## master #232 +/- ##
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- Coverage 70.30% 70.30% -0.01%
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Files 27 27
Lines 3718 3721 +3
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+ Hits 2614 2616 +2
+ Misses 989 988 -1
- Partials 115 117 +2
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aaronbee
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Testing shows this didn't affect performance, so I think this is worth merging because it simplifies thinking about the cost of a SendBatch. |
ciacono
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Sep 14, 2023
ciacono
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Sep 14, 2023
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The idea behind this makes sense to me, although I do see concern with the potential slowdown because we are doing this sequentially. But having the resource usage being more predictable (and less expensive with less goroutines) seems worthwhile. Other than the comment I left, LGTM.
Instead of starting goroutines we can queue each region server's collection of RPCs and only after queueing them all wait for all responses. We get a similar amount of parallelism, the only potential slow down is that we can't queue one region server's RPCs until the previous is able to be queued. By not starting goroutines, the resource usage of SendBatch is more predictable. And not starting goroutines is likely to be less expensive overall.
ciacono
approved these changes
Sep 15, 2023
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Instead of starting goroutines we can queue each region server's collection of RPCs and only after queueing them all wait for all responses. We get a similar amount of parallelism, the only potential slow down is that we can't queue one region server's RPCs until the previous is able to be queued.
By not starting goroutines, the resource usage of SendBatch is more predictable. And not starting goroutines is likely to be less expensive overall.
This change also adds a new metric for number of splits that occur in SendBatch.