What is the purpose of non-mining sealer nodes in clique POA private ethereum network with respect to the clique consensus

by MAYANK SAXENA   Last Updated August 13, 2018 20:28 PM - source

I did setup a private POA ethereum network with 4 nodes with 3 of them mining . I went on to try a lot of combinations with some miners and sealers and reached to a conclusion that every miner hash to be a sealer otherwise it wont seal a block . However the network works fine with 3 sealers of them 2 mining and a non-mining sealer node. My question is that how this non-mining sealer node is used in clique consensus?

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