On Thu, Nov 19, 2020 at 12:53 AM 张铎(Duo Zhang) <palomino...@gmail.com> wrote:
> Oh, just noticed that the design doc has been committed to master and > branch-2 directly. I'm not sure if this is the correct way but since it is > already like this, let's just fix it on master and branch-2. > > Then there is no blocker on the merge of the feature branch any more. > Change my vote to +1. > > I've already reopened HBASE-25284 to mention what to change in the design > doc. I do not have the permission to modify the design doc, as it has been > messed up by others so the modification permission for most people have > been removed to avoid spamming. > > I granted you edit rights. S > Thanks. > > 张铎(Duo Zhang) <palomino...@gmail.com> 于2020年11月19日周四 下午2:24写道： > > > It is not only about satisfying me, as a community we need to make sure > > that we are all on the same page before actually moving forward, or at > > least we should know what is the actual pivot point. > > > > I did not pose a quiz for you, there are just 4 technical questions. You > > strongly disagree that the test proposed by me is for HBASE-18070 and > keep > > saying that the problem can be solved by 'HedgeRead', then I think it is > > valid for me to ask what do you think about what problems can be solved > by > > the 'HedgeRead' and what can be solved by HBASE-18070? If this is not > well > > understood by all, later someone may remove this benefit of HBASE-18070 > and > > you will approve it and make HBASE-18070 useless. > > > > That's why I proposed we add this explicitly to the design doc, to at > > least let all the developers know this. > > > > Thanks. > > > > Stack <st...@duboce.net> 于2020年11月19日周四 下午1:43写道： > > > >> On Wed, Nov 18, 2020 at 7:03 PM 张铎(Duo Zhang) <palomino...@gmail.com> > >> wrote: > >> > >> > OK, let me explain the technical part. > >> > > >> > What I proposed in the test is to verify that we could distribute the > >> load > >> > across all the meta so we could benefit if the main replica is f**ked > >> up. > >> > But then stack said this has already been solved by the old read > >> replicas > >> > feature. Maybe in the first place I did not speak clearly enough but > >> later > >> > I spoke clearly that I was talking about the distribution of the load > >> for > >> > the meta table, but stack still does not agree and insist that I was > >> > talking about hedge read. > >> > > >> > For me, I do not think hedge read can fully solve the 'primary region > >> > f**ked up' problem. Of course we will go to secondary replicas if the > >> > primary can not respond, but it usually means the primary replica is > >> not in > >> > a good state. The region server in a cluster will not go to the > >> secondary > >> > replicas to read right? If the primary replica is unavailable, a > >> failure of > >> > meta read could crash a region server. And it could also affect write > >> > requests to meta, which could cause serious problems on master too. > I've > >> > implemented a lot of procedures on 2.x, usually we will just abort > >> master > >> > if there is a failure when accessing meta. This means, in the old > hedge > >> > read mode, if the primary replica has been f**ked up, the cluster will > >> not > >> > be in a good state, finally the test will fail. > >> > > >> > And I think HBASE-18070 can solve the problem. But the main developer > >> seems > >> > to have a different opinion on this. So I asked him what are his > >> opinion on > >> > the 4 questions on jira, but so far I do not get a response from him > >> yet. > >> > > >> > Why I do not want to write the above explanation before is that, if I > >> > throw this out, the main developer could easily say that 'yes I agree > >> with > >> > you, this is my point', to simply let the vote process to pass. But > the > >> > actual issue will be covered as he never speaks out his own opinion, > and > >> > may cause trouble in the future. > >> > > >> > > >> The veto seems to pivot on whether I, a co-author, knows what the > feature > >> I > >> co-designed and co-wrote does. He has posed a quiz for me to fill out > that > >> I am to answer to his satisfaction even though my co-author has already > >> answered his questionnaire. > >> > >> I suggest that the vote be on the feature rather than my responses to a > >> questionnaire of Duo's making. > >> > >> S > >> > >> > >> > >> > Thanks. > >> > > >> > Andrew Purtell <apurt...@apache.org> 于2020年11月19日周四 上午10:23写道： > >> > > >> > > That's not how a technical veto works. The burden to explain how the > >> > > contributors can fix the reason for the veto is on you. You need to > >> give > >> > a > >> > > list of action items. "Fundamental of the issue" is just your > opinion. > >> > > Nobody here is a Boss. Contributors don't have to satisfy your > >> (nebulous) > >> > > requirements, you have to successfully argue your point. > >> > > > >> > > On Wed, Nov 18, 2020 at 6:10 PM 张铎(Duo Zhang) < > palomino...@gmail.com> > >> > > wrote: > >> > > > >> > > > Thank you Andrew. I think my last comment clearly describe the two > >> > > > questions given by you. > >> > > > > >> > > > A clear and compelling reason why the proposed change is harmful > or > >> > > > > undesirable > >> > > > > >> > > > > >> > > > It is about the fundamental of this issue. Due to the back and > >> forth on > >> > > how > >> > > > a test could used to verify the feature, I'm concerned whether the > >> main > >> > > > developer has the same opinion on the problems we want to solve > for > >> > this > >> > > > issue. This is a very critical problem, as if we can not even > reach > >> an > >> > > > agreement on what to solve, I do not think we should allow the > >> merge of > >> > > the > >> > > > branch. > >> > > > > >> > > > One or more clear and specific action items which would allow the > >> > > > > contributors to cure the reason for the veto > >> > > > > >> > > > > >> > > > This is also very very clear even before we started this vote > >> thread? I > >> > > > asked 4 technical questions and waited for an answer, but seems > the > >> > main > >> > > > developer refused to answer the questions and let me to read the > >> design > >> > > doc > >> > > > of all the related issues. The design doc is not all written by > him > >> so > >> > I > >> > > do > >> > > > not think this is a constructive suggestion to solve the concerns > >> here. > >> > > > > >> > > > Thanks. > >> > > > > >> > > > Sean Busbey <bus...@apache.org> 于2020年11月19日周四 上午4:27写道： > >> > > > > >> > > > > Pause a moment Huaxiang and give some time for the PMC to talk > in > >> > > > > private a bit. > >> > > > > > >> > > > > On Wed, Nov 18, 2020 at 12:44 PM Huaxiang Sun < > >> huaxiang...@gmail.com > >> > > > >> > > > > wrote: > >> > > > > > > >> > > > > > This vote passed 24 hours deadline. We got 5 +1s and 1 -1. > What > >> is > >> > > the > >> > > > > path > >> > > > > > to move forward? Anything we (as feature developers) can do to > >> > revert > >> > > > the > >> > > > > > -1? > >> > > > > > As it blocks 2.4 release, I think we need a decision asap. > >> > > > > > > >> > > > > > Thanks, > >> > > > > > Huaxiang > >> > > > > > > >> > > > > > On Wed, Nov 18, 2020 at 8:46 AM Andrew Purtell < > >> > > > andrew.purt...@gmail.com > >> > > > > > > >> > > > > > wrote: > >> > > > > > > >> > > > > > > Let me refer you to the Foundation guidance on voting: > >> > > > > > > https://www.apache.org/foundation/voting.html , and > >> specifically > >> > > the > >> > > > > > > section on vetos: > >> > > > > > > > >> > > > > > > A code-modification proposal may be stopped dead in its > tracks > >> > by a > >> > > > -1 > >> > > > > vote > >> > > > > > > by a qualified voter. This constitutes a veto, and it cannot > >> be > >> > > > > overruled > >> > > > > > > nor overridden by anyone. Vetos stand until and unless > >> withdrawn > >> > by > >> > > > > their > >> > > > > > > casters. To prevent vetos from being used capriciously, they > >> must > >> > > be > >> > > > > > > accompanied by a technical justification showing why the > >> change > >> > is > >> > > > bad > >> > > > > > > (opens a security exposure, negatively affects performance, > >> > *etc.* > >> > > > ). A > >> > > > > > > veto without a justification is invalid and has no weight. > >> > > > > > > The Merriam-Webster dictionary defines 'capricious' as a > >> sudden, > >> > > > > > > unpredictable, and impulsive act > >> > > > > > > <https://www.merriam-webster.com/dictionary/caprice>. To > >> guard > >> > > > against > >> > > > > > > this > >> > > > > > > kind of chaos in voting on technical matters, a technical > veto > >> > must > >> > > > > have a > >> > > > > > > clear and compelling reason. Neither on the earlier thread > nor > >> > the > >> > > > > JIRA is > >> > > > > > > a clear and compelling concern about the to-be-merged > feature, > >> > > > clearly > >> > > > > > > communicated. A technical veto must also be accompanied with > >> > clear > >> > > > and > >> > > > > > > actionable feedback for the contributors, which in my view > is > >> > also > >> > > > > absent. > >> > > > > > > A veto because one participant in the discussion does not > >> > > understand > >> > > > > the > >> > > > > > > change or its motivation, or simply expresses an opinion > that > >> it > >> > is > >> > > > not > >> > > > > > > ideal and/or needed, is not a valid reason for a technical > >> veto > >> > and > >> > > > > > > certainly does not provide actionable guidance for curing > the > >> > veto. > >> > > > The > >> > > > > > > burden of the technical veto is not on the contributors to > >> > convince > >> > > > the > >> > > > > > > vetoing voter; the burden of proof is on the vetoing voter. > >> > > > > > > > >> > > > > > > In my view, as things stand the veto here is not yet valid > but > >> > can > >> > > be > >> > > > > made > >> > > > > > > valid by offering the following: > >> > > > > > > > >> > > > > > > - A clear and compelling reason why the proposed change > is > >> > > harmful > >> > > > > or > >> > > > > > > undesirable > >> > > > > > > - One or more clear and specific action items which would > >> > allow > >> > > > the > >> > > > > > > contributors to cure the reason for the veto > >> > > > > > > > >> > > > > > > Otherwise, the veto should be given no weight. > >> > > > > > > > >> > > > > > > To explain further my reason for concern, I have reviewed > the > >> > > > > discussion > >> > > > > > > thread and JIRA in question here and the reason given for > veto > >> > > seems > >> > > > > to me > >> > > > > > > a relatively minor technical matter that can easily be > cured, > >> to > >> > > the > >> > > > > extent > >> > > > > > > it has been described (the reason is somewhat unclear), > with a > >> > > simple > >> > > > > and > >> > > > > > > straightforward follow up. There is no blocking functional, > >> > > > > performance, > >> > > > > > > regression, or security related reason. However we have a > >> repeat > >> > > of a > >> > > > > > > pattern of disagreement related to a personal problem > between > >> two > >> > > > > > > participants in the discussion, including the vetoing voter. > >> > > > > > > > >> > > > > > > > >> > > > > > > On Tue, Nov 17, 2020 at 8:03 PM Andrew Purtell < > >> > > > > andrew.purt...@gmail.com> > >> > > > > > > wrote: > >> > > > > > > > >> > > > > > > > I am concerned this is not a valid technical veto and it’s > >> time > >> > > for > >> > > > > the > >> > > > > > > > PMC to take a more active role. This is poison to > >> collaboration > >> > > and > >> > > > > it is > >> > > > > > > > affecting multiple people. > >> > > > > > > > > >> > > > > > > > > On Nov 17, 2020, at 5:43 PM, 张铎 <palomino...@gmail.com> > >> > wrote: > >> > > > > > > > > > >> > > > > > > > > Hi, bring my -1 from the HEAD-UP thread, this is a > veto. > >> > > > > > > > > > >> > > > > > > > > My concerns have not been fully resolved. Let's work it > >> out > >> > on > >> > > > > jira. > >> > > > > > > > > > >> > > > > > > > > Thanks. > >> > > > > > > > > > >> > > > > > > > > clara xiong <clarax98...@gmail.com> 于2020年11月18日周三 > >> 上午1:51写道： > >> > > > > > > > > > >> > > > > > > > >> +1 > >> > > > > > > > >> > >> > > > > > > > >>> On Tue, Nov 17, 2020 at 9:49 AM Huaxiang Sun < > >> > > > > huaxiang...@gmail.com> > >> > > > > > > > >>> wrote: > >> > > > > > > > >>> > >> > > > > > > > >>> +1 > >> > > > > > > > >>> > >> > > > > > > > >>> On Tue, Nov 17, 2020 at 9:21 AM Bharath Vissapragada < > >> > > > > > > > >> bhara...@apache.org> > >> > > > > > > > >>> wrote: > >> > > > > > > > >>> > >> > > > > > > > >>>> +1. Reviewed the design doc and the consolidated > patch, > >> > > great > >> > > > > > > > >>> improvement, > >> > > > > > > > >>>> thanks for putting this together. > >> > > > > > > > >>>> > >> > > > > > > > >>>> On Tue, Nov 17, 2020 at 9:09 AM Stack < > >> st...@duboce.net> > >> > > > wrote: > >> > > > > > > > >>>> > >> > > > > > > > >>>>> +1 > >> > > > > > > > >>>>> S > >> > > > > > > > >>>>> > >> > > > > > > > >>>>> On Tue, Nov 17, 2020 at 8:43 AM Stack < > >> st...@duboce.net> > >> > > > > wrote: > >> > > > > > > > >>>>> > >> > > > > > > > >>>>>> Please VOTE on whether to merge HBASE-18070 feature > >> > branch > >> > > > to > >> > > > > > > > >> master > >> > > > > > > > >>>> (and > >> > > > > > > > >>>>>> HBASE-18070.branch-2 to branch-2). The VOTE runs > for > >> 24 > >> > > > > hours. The > >> > > > > > > > >>>>> majority > >> > > > > > > > >>>>>> prevails (+ or -). > >> > > > > > > > >>>>>> > >> > > > > > > > >>>>>> Quoting the design lead-in: > >> > > > > > > > >>>>>> > >> > > > > > > > >>>>>> Read Replicas on the hbase:meta Table currently > only > >> > does > >> > > > > > > primitive > >> > > > > > > > >>>> read > >> > > > > > > > >>>>>> of the primary’s hfiles refreshing every > >> (configurable) > >> > N > >> > > > > seconds. > >> > > > > > > > >>> This > >> > > > > > > > >>>>>> issue is about making it so we can do the Async WAL > >> > > > > Replication > >> > > > > > > > >>>>>> < > >> > http://hbase.apache.org/book.html#_asnyc_wal_replication > >> > > > > >> > > > > > > > >> ability, > >> > > > > > > > >>>>>> currently only available for user-space Tables, > >> against > >> > > the > >> > > > > > > > >>> hbase:meta > >> > > > > > > > >>>>>> system Tables too; i.e. the primary replica pushes > >> edits > >> > > to > >> > > > > its > >> > > > > > > > >>>> Replicas > >> > > > > > > > >>>>> so > >> > > > > > > > >>>>>> they run much closer to the primaries’ state. If > >> clients > >> > > > > could be > >> > > > > > > > >>>>> satisfied > >> > > > > > > > >>>>>> reading from Replicas, then we could have improved > >> > > > hbase:meta > >> > > > > > > > >> uptimes > >> > > > > > > > >>>> but > >> > > > > > > > >>>>>> also, we can distribute load off of the primary and > >> > > > alleviate > >> > > > > > > > >>>> hbase:meta > >> > > > > > > > >>>>>> Table (read) hotspotting. > >> > > > > > > > >>>>>> > >> > > > > > > > >>>>>> Each PR that comprises the feature branch has been > >> > > reviewed > >> > > > > before > >> > > > > > > > >>>>> commit. > >> > > > > > > > >>>>>> > >> > > > > > > > >>>>>> * For the design, see [2]. > >> > > > > > > > >>>>>> * For an amalgamated PR of the 5 or 6 reviewed PRs > >> that > >> > > > > comprise > >> > > > > > > > >>> this > >> > > > > > > > >>>>>> feature, see [3]. > >> > > > > > > > >>>>>> * For a PE report that compared performance before > >> and > >> > > > after, > >> > > > > see > >> > > > > > > > >>>>>> HBASE-25127 (no regression). > >> > > > > > > > >>>>>> * A report on ITBLL runs is pending to be attached > to > >> > > > > HBASE-18070 > >> > > > > > > > >>> but > >> > > > > > > > >>>>>> runs so far show no regression with the feature > >> enabled > >> > > > (ITBLL > >> > > > > > > runs > >> > > > > > > > >>>> were > >> > > > > > > > >>>>>> done against a backport of this feature to branch-2 > >> as > >> > the > >> > > > > ITBLL > >> > > > > > > > >>> state > >> > > > > > > > >>>> of > >> > > > > > > > >>>>>> master is currently an unknown). > >> > > > > > > > >>>>>> > >> > > > > > > > >>>>>> Testing continues mainly looking for further > >> improvement > >> > > and > >> > > > > to > >> > > > > > > > >>> better > >> > > > > > > > >>>>>> understand this feature in operation. Documentation > >> is > >> > > > > included. > >> > > > > > > > >>> There > >> > > > > > > > >>>>> are > >> > > > > > > > >>>>>> some follow-ons that have been identified but these > >> can > >> > > land > >> > > > > > > later. > >> > > > > > > > >>>>>> > >> > > > > > > > >>>>>> Thanks and thanks to all who contributed to this > >> > feature; > >> > > > the > >> > > > > > > > >>> reviewers > >> > > > > > > > >>>>>> and the testers in particular. > >> > > > > > > > >>>>>> > >> > > > > > > > >>>>>> S > >> > > > > > > > >>>>>> > >> > > > > > > > >>>>>> 1. > >> > > http://hbase.apache.org/book.html#_asnyc_wal_replication > >> > > > > > > > >>>>>> 2. > >> > > > > > > > >>>>>> > >> > > > > > > > >>>>> > >> > > > > > > > >>>> > >> > > > > > > > >>> > >> > > > > > > > >> > >> > > > > > > > > >> > > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > https://docs.google.com/document/d/1jJWVc-idHhhgL4KDRpjMsQJKCl_NRaCLGiH3Wqwd3O8/edit# > >> > > > > > > > >>>>>> This patch is currently missing HBASE-25280, a bug > >> found > >> > > in > >> > > > > > > > >> testing. > >> > > > > > > > >>>>>> 3. https://github.com/apache/hbase/pull/2643 > >> > > > > > > > >>>>>> > >> > > > > > > > >>>>> > >> > > > > > > > >>>> > >> > > > > > > > >>> > >> > > > > > > > >> > >> > > > > > > > > >> > > > > > > > >> > > > > > > > >> > > > > > > -- > >> > > > > > > Best regards, > >> > > > > > > Andrew > >> > > > > > > > >> > > > > > > Words like orphans lost among the crosstalk, meaning torn > from > >> > > > truth's > >> > > > > > > decrepit hands > >> > > > > > > - A23, Crosstalk > >> > > > > > > > >> > > > > > >> > > > > >> > > > >> > > > >> > > -- > >> > > Best regards, > >> > > Andrew > >> > > > >> > > Words like orphans lost among the crosstalk, meaning torn from > truth's > >> > > decrepit hands > >> > > - A23, Crosstalk > >> > > > >> > > >> > > >
