Support auto adjusting quorum size for 2-node cluster #119
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* 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.
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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.