fix(service): run only single attach/detach operation simultaneously #94
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Run only single attach/detach operation simultaneously per node.
CSI attacher sidecar runs multiple goroutines (10 by default) that handle volume attachments and that will lead many
SERVER_STATE_ILLEGAL
errors when driver tries to do those operations concurrently towards the same node. Those operations succeed eventually but those cause unnecessary load to backend and increased pod deployment times.This PR tries to solve that problem by using mutex lock per node when executing
ControllerPublishVolume
andControllerUnpublishVolume
methods.