Commits on Jun 10, 2020

1. Support auto adjusting quorum size for 2-node cluster …

   * The quorum size of the 2-node cluster is 2, which means if any node
   goes offline, the cluster becomes unavailable immediately.
   
   * Added a configurable option: if we turn on this option, the quorum
   size of the 2-node cluster is automatically adjusted to 1, if any
   node becomes offline. The remaining node can do self-election and
   also can commit incoming requests. The quorum size will be restored
   using the default value once the offline node becomes online.
   
   * It is not entirely safe, and dealing with log divergence is the
   users' responsibility. Using the custom term counter to avoid
   duplicate terms may be helpful.

   

   greensky00 committed Jun 10, 2020
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