Reads should not create an entry in the log

[belaban]

Currently, read requests can either be dirty (handled locally) or are added to the log as normal entries. In the latter case, there's a write to disk which is costly.
Implement a third solution that provides linearizable reads as described in section 6.4 of [1].

[1] https://github.com/ongardie/dissertation

[ongardie]

Oh cool, someone's been reading that thing I wrote :)

[belaban]

And even more than once ! :-) Great dissertation ! Unfortunately most (including my own) are throwaway stuff :-)

[belaban]

Implement this in all building blocks (including ReplicatedStateMachine)

[mauricioscastro]

Hi Belaban, I am starting to use this here . Is it ok to assume this issue is no more in 3.6.6 final?

By the way, thank you so much for your coding.

[belaban]

Hi @mauricioscastro,
jgroups-raft is at release 0.2 and is independent from the JGroups (e.g. 3.6.6) project.
Issue #18 is still open, and will remain open for some time, as I had to go back to JGroups, to work on the 4.0 release. I will come back to work on jgroups-raft, but don't know yet when.
However, #18 doesn't render jgroups-raft incorrect, it merely slows down reads as a read is treated (more or less) like a write. You could turn this off if you wanted potentially stale reads.
Cheers,