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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