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Simplify join protocol #25

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Simplify join protocol #25

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Commits on May 4, 2020

  1. Simplifying join protocol 

    Instead of a two-phase protocol, joins are now happening in one phase where the seed node broadcasts K alerts (one for each observer).
This should drastically reduce the amount of messages exchanged in the cluster when a large number of nodes join.
    @manuelbernhardt
    manuelbernhardt committed May 4, 2020
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  2. Improving comment

    @manuelbernhardt
    manuelbernhardt committed May 4, 2020
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  3. Fixing bug & adding safeguard to client 

    Clients cannot join through two separate seeds at the same time
    @manuelbernhardt
    manuelbernhardt committed May 4, 2020
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  4. Guard against nodes attempting to join during a view change 

    In the rare case that a node attempts to join at the exact same time that a view change is in progress, it is now told to retry
    @manuelbernhardt
    manuelbernhardt committed May 4, 2020
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