[LB policy API] change metadata mutation API to handle discarded picks#36968
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markdroth wants to merge 7 commits intogrpc:masterfrom
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[LB policy API] change metadata mutation API to handle discarded picks#36968markdroth wants to merge 7 commits intogrpc:masterfrom
markdroth wants to merge 7 commits intogrpc:masterfrom
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…ded picks (grpc#36968)" This reverts commit 34a0318.
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grpc#36968) Previously, metadata mutations were made by the picker directly, which meant that they would be applied even if the channel winds up discarding the pick due to the returned subchannel having been disconnected by the time the pick result is returned. This changes the API such that pickers return metadata mutations along with the pick result, so that the mutations won't get applied unless the pick result is actually used. Closes grpc#36968 COPYBARA_INTEGRATE_REVIEW=grpc#36968 from markdroth:lb_metadata_api 2765da6 PiperOrigin-RevId: 645451869
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Previously, metadata mutations were made by the picker directly, which meant that they would be applied even if the channel winds up discarding the pick due to the returned subchannel having been disconnected by the time the pick result is returned. This changes the API such that pickers return metadata mutations along with the pick result, so that the mutations won't get applied unless the pick result is actually used.