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From Jia Zhai <zhaiji...@gmail.com>
Subject Re: [VOTE] Merge DistributedLog as the subproject of Apache BookKeeper
Date Fri, 09 Jun 2017 10:21:57 GMT
+1 (non-binding)

On Fri, Jun 9, 2017 at 3:02 PM, Stevo Slavić <sslavic@gmail.com> wrote:

> +1 (non-binding)
>
> On Fri, Jun 9, 2017 at 8:47 AM, Sijie Guo <guosijie@gmail.com> wrote:
>
> > (dropping general@)
> >
> > - Sijie
> >
> > On Thu, Jun 8, 2017 at 5:21 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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