+ 1 ( n o n b i n d i n g )
On Fri, Jun 9, 2017 at 3:47 AM, Sijie Guo <guosi...@gmail.com> wrote: > (dropping general@) > > - Sijie > > On Thu, Jun 8, 2017 at 5:21 PM, Sijie Guo <guosi...@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 > > > > > > > > > > > > > > >
