Allow configuring gRPC's MaxConcurrentStreams #3642
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rolandshoemaker
previously approved these changes
Apr 11, 2018
rolandshoemaker
approved these changes
Apr 12, 2018
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During periods of peak load, some RPCs are significantly delayed (on the order of seconds) by client-side blocking. HTTP/2 clients have to obey a "max concurrent streams" setting sent by the server. In Go's HTTP/2 implementation, this value defaults to 250, so the gRPC default is also 250. So whenever there are more than 250 requests in progress at a time, additional requests will be delayed until there is a slot available.
During this peak load, we aren't hitting limits on CPU or memory, so we should increase the max concurrent streams limit to take better advantage of our available resources. This PR adds a config field to do that.
Fixes #3641.