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Fix Deadlock in groupbytrace#1847

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chris-smith-zocdoc wants to merge 9 commits intoopen-telemetry:masteropen-telemetry/opentelemetry-collector:masterfrom Zocdoc:issue_1811Zocdoc/opentelemetry-collector:issue_1811Copy head branch name to clipboard

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Commits on Sep 24, 2020

• Add test case to reproduce deadlock open-telemetry#1811

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• Fix deadlock open-telemetry#1811 by simplifying the event machine used by the groupbytrace processor

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• groupbytrace: Remove shutdown mutex, replace it with a channel

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• Add another test case for high concurrency in the groupbytrace processor with a very short wait duration

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• change log level per guidelines

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• Reduce the number of goroutines creating during the test so the race detection can be used

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• Modify the groupbytrace storage_memory to defer its mutex unlocks

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Commits on Sep 25, 2020

• Remove data race from test

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• lint

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