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kvcoord,kvclient,gossip: gossip range lease acquisition #52572

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kvcoord,kvclient,gossip: gossip range lease acquisition #52572

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Commits on Aug 11, 2020

  1. kvcoord,kvclient,gossip: gossip range lease acquisition 

    Before this patch, it was possible for a range cache to contain an
outdated lease if the node with the lease was restarted or went
AWOL.

This patch introduces a mechanism by which the new owner of a range
lease announces this ownership to other nodes via gossip.
Any cached lease for that range gets updated from the gossip update
if the gossiped lease is more recent than the one known.

Release note (general change): CockroachDB nodes now learn more
actively of range leadership transfers from other nodes. This makes
query performance generally more resilient to routine node restarts,
as fewer queries now get routed to an outdated or unavailable node.
    @knz
    knz committed Aug 11, 2020
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