[jira] [Created] (MESOS-43) Reading from beginning() to ending() of a replicated log should have "safe" semantics

["Benjamin Hindman (Created) (JIRA)" <ji...@apache.org>]

Reading from beginning() to ending() of a replicated log should have "safe" semantics 
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                 Key: MESOS-43
                 URL: https://issues.apache.org/jira/browse/MESOS-43
             Project: Mesos
          Issue Type: Improvement
            Reporter: Benjamin Hindman
            Assignee: Benjamin Hindman
            Priority: Minor


Right now it is possible to that reading from beginning() to ending() of a local replica will throw an exception because the local replica may have unlearned actions in the log. Creating a local writer *first* is only a partial solution because there is still a race after the writer has it's underlying coordinator elected but before calling ending() where another writer might (get elected and) append other actions to the log. It seems like a good solution is one where beginning() and ending() actually return special Log::Position objects that can be used to determine how to treat the semantics of Reader::read. It might also make sense to have a Replica::readFrom and Replica::readTo to help deal with this problem.

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