Hi - I am adding the Pulsar Dev list so that podling can be certainly aware. (I know that there are BookKeeper dev involved in Pulsar.
Please drop general@ off for any further discussions from the Pulsar side. Regards, Dave > On 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
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