Backport 1.5.0: physical/spanner: use separate client for updating locks (#9423)#9440
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* physical/spanner: use separate client for updating locks We believe this mitigates an issue where a large influx of requests cause the leader to be unable to update the lock table (since it cannot grab a client from the pool or the client has no more open connections), which causes cascading failure.
kalafut
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…icorp#9426) (hashicorp#9440) This reverts commit a55e884517a7c1f25e097a52e1555d4f81137068. Co-authored-by: Ryan Cragun <me@ryan.ec>
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We believe this mitigates an issue where a large influx of requests
cause the leader to be unable to update the lock table (since it cannot
grab a client from the pool or the client has no more open connections),
which causes cascading failure.