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From Edward Ribeiro <edward.ribe...@gmail.com>
Subject Re: [VOTE] Merge DistributedLog as the subproject of Apache BookKeeper
Date Tue, 13 Jun 2017 01:38:56 GMT
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On Fri, Jun 9, 2017 at 3:47 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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