Emergency Reparent Refactor#6449

Merged

deepthi merged 27 commits intovitessio:masterfrom

planetscale:emergency-reparent-refactor

Aug 20, 2020

Commits on Jul 27, 2020

Finished strategy steps 1-4 from main refactor issue.
PrismaPhonic
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Updated test for new io_thread only logic.
PrismaPhonic
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Some tests are failing because master is not actually stopped. We should ensure that in this case getting N responses is ok, just not less than N-1
PrismaPhonic
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Finally passing. Hallelujah.
PrismaPhonic
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Finished all major aspects of design, other than
PrismaPhonic
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Added ignore_unreachable_replicas flag along with a test to check that it is working as intended.
PrismaPhonic
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Silly commit because CICD seems to still have an old version.
PrismaPhonic
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Switch error nil checks to NoError checks per review suggestion.
PrismaPhonic
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Added explicit checking of error string.
PrismaPhonic
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Commits on Aug 1, 2020

Simplify design drastically per review suggestion to synchronously wait on handleMaster.
PrismaPhonic
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Commits on Aug 5, 2020

Fix test issue now that SetMaster calls are just best effort and done on a defer.
PrismaPhonic
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Commits on Aug 18, 2020

Small fixes per review suggestions.
PrismaPhonic
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Commits on Aug 19, 2020