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From Sijie Guo <guosi...@gmail.com>
Subject Re: [VOTE] Merge DistributedLog as the subproject of Apache BookKeeper
Date Fri, 09 Jun 2017 00:50:26 GMT
On Thu, Jun 8, 2017 at 5:47 PM, John D. Ament <johndament@apache.org> wrote:

> On Thu, Jun 8, 2017 at 8:44 PM Sijie Guo <guosijie@gmail.com> wrote:
>
> > Sure.
> >
> > The discussion email thread between BookKeeper PMC and DistributedLog
> PPMC:
> >
> > https://mail-search.apache.org/pmc/private-arch/
> bookkeeper-private/201706.mbox/%3CCAO2yDyZu+R1EaePyHZuFxe_W0qAkHNYxNnmn5+
> zX6q520uzJKw@mail.gmail.com%3E
> >
> > The BookKeeper PMC VOTE email thread (it is still ongoing):
> >
> > https://mail-search.apache.org/pmc/private-arch/
> bookkeeper-private/201706.mbox/%3CCAO2yDyacdXuXh==iw1OqrRiuGoxHprP_
> HtnOFojOT5RXMv6rEQ@mail.gmail.com%3E
> >
> > As our mentor suggested, I am following the process here :
> > http://incubator.apache.org/guides/graduation.html#subproject
> > This is the community vote for the first step. Let me know if I missed
> > anything.
> >
>
> You mean this is the vote on the PPMC?  If so please drop general@.
>

Yeah, it is the vote on the PPMC. The document is saying to copy the vote
to incubator general list when the VOTE is proposed.

I will drop general@ then.

- Sijie


>
>
> >
> > - Sijie
> >
> >
> >
> > On Thu, Jun 8, 2017 at 5:37 PM, John D. Ament <johndament@apache.org>
> > wrote:
> >
> > > Sije,
> > >
> > > Can you provide links to the PPMC and PMC votes going on for this move?
> > >
> > > John
> > >
> > > On Thu, Jun 8, 2017 at 8:21 PM Sijie Guo <guosijie@gmail.com> wrote:
> > >
> > > > ( /cc bookkeeper dev@ and incubator general@ for awareness )
> > > >
> > > > Hi all,
> > > >
> > > > There was a joint discussion between BookKeeper PMC and
> DistributedLog
> > > PPMC
> > > > about moving the development of DistributedLog as part of Apache
> > > > BookKeeper. The reasons behind it are:
> > > >
> > > > First, DistributedLog is born as an extension to BookKeeper, to offer
> > > > continuous log streams as the service. The ledger API in bookkeeper
> is
> > a
> > > > lower level API and has learning curves, while the log stream API in
> > > > distributedlog is a higher level API that simplifies the usage. The
> > > > combination of ledger API and stream API would offer a better
> > > > developer/user experience for applications.
> > > >
> > > > Secondly, using ledgers to build continuous (re-openable) log stream
> > is a
> > > > very common pattern for BookKeeper use cases. We did this for HDFS
> > > namenode
> > > > journal, for Hedwig, for DistributedLog, and for Pulsar. The same
> > pattern
> > > > has been implemented again and again. Merge DistributedLog (also
> > > > ManagedLedger in Pulsar) with BookKeeper will consolidate all the
> > > > development efforts around this common 'log stream' pattern.
> > > >
> > > > Thirdly, the 'log' stream abstraction is a good abstraction for both
> > > > messaging and streaming. Internally at BookKeeper, there are a few
> > places
> > > > that can use such 'messaging' facility to improve bookkeeper itself.
> > the
> > > > log stream in DistributedLog can be used internally at bookkeeper for
> > > > streaming changes as well.
> > > >
> > > > We choose merging DistributedLog as subproject rather than modules.
> It
> > > is a
> > > > softer starting point to avoid disrupting the folks who are depending
> > on
> > > > the ledger api alone. The BookKeeper PMC and DistributedLog PPMC has
> > > > achieved initial consensus on this merge. There is an official VOTE
> > > ongoing
> > > > in bookkeeper PMC. We'd like to bring this to the distributedlog
> > > community
> > > > for a community vote following the guidelines here
> > > > <http://incubator.apache.org/guides/graduation.html#subproject>.
> > > >
> > > > Please vote +1 if in favor of merging DistributedLog to BookKeeper,
> and
> > > -1
> > > > if not. The vote will be open until Tuesday 13rd June, 18:00 PST.
> > > >
> > > > - Sijie
> > > >
> > >
> >
>

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