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From Ayush Saxena <ayush...@gmail.com>
Subject Re: [DISCUSS] About creation of Hadoop Thirdparty repository for shaded artifacts
Date Sun, 05 Jan 2020 19:08:44 GMT
Hey Sree

> apache/hadoop-thirdparty, How would it fit into ASF ? As an Incubating
> Project ? Or as a TLP ?
> Or as a new project definition ?
>
A sub project of Apache Hadoop, having its own independent release cycles.
May be you can put this into the same column as ozone or as
submarine(couple of months ago).

Unifying for all, seems interesting but each project is independent and has
its own limitations and way of thinking, I don't think it would be an easy
task to bring all on the same table and get them agree to a common stuff.

I guess this has been into discussion since quite long, and there hasn't
been any other alternative suggested. Still we can hold up for a week, if
someone comes up with a better solution, else we can continue in the
present direction.

-Ayush



On Sun, 5 Jan 2020 at 05:03, Sree Vaddi <sree_at_chess@yahoo.com.invalid>
wrote:

> apache/hadoop-thirdparty, How would it fit into ASF ? As an Incubating
> Project ? Or as a TLP ?
> Or as a new project definition ?
>
> The effort to streamline and put in an accepted standard for the
> dependencies that require shading,seems beyond the siloed efforts of
> hadoop, hbase, etc....
>
> I propose, we bring all the decision makers from all these artifacts in
> one room and decide best course of action.I am looking at, no projects
> should ever had to shade any artifacts except as an absolute necessary
> alternative.
>
>
> Thank you./Sree
>
>
>
>     On Saturday, January 4, 2020, 7:49:18 AM PST, Vinayakumar B <
> vinayakumarb@apache.org> wrote:
>
>  Hi,
> Sorry for the late reply,.
> >>> To be exact, how can we better use the thirdparty repo? Looking at
> HBase as an example, it looks like everything that are known to break a lot
> after an update get shaded into the hbase-thirdparty artifact: guava,
> netty, ... etc.
> Is it the purpose to isolate these naughty dependencies?
> Yes, shading is to isolate these naughty dependencies from downstream
> classpath and have independent control on these upgrades without breaking
> downstreams.
>
> First PR https://github.com/apache/hadoop-thirdparty/pull/1 to create the
> protobuf shaded jar is ready to merge.
>
> Please take a look if anyone interested, will be merged may be after two
> days if no objections.
>
> -Vinay
>
>
> On Thu, Oct 10, 2019 at 3:30 AM Wei-Chiu Chuang <weichiu@apache.org>
> wrote:
>
> > Hi I am late to this but I am keen to understand more.
> >
> > To be exact, how can we better use the thirdparty repo? Looking at HBase
> > as an example, it looks like everything that are known to break a lot
> after
> > an update get shaded into the hbase-thirdparty artifact: guava, netty,
> ...
> > etc.
> > Is it the purpose to isolate these naughty dependencies?
> >
> > On Wed, Oct 9, 2019 at 12:38 PM Vinayakumar B <vinayakumarb@apache.org>
> > wrote:
> >
> >> Hi All,
> >>
> >> I have updated the PR as per @Owen O'Malley <owen.omalley@gmail.com>
> >> 's suggestions.
> >>
> >>    i. Renamed the module to 'hadoop-shaded-protobuf37'
> >>    ii. Kept the shaded package to 'o.a.h.thirdparty.protobuf37'
> >>
> >> Please review!!
> >>
> >> Thanks,
> >> -Vinay
> >>
> >>
> >> On Sat, Sep 28, 2019 at 10:29 AM 张铎(Duo Zhang) <palomino219@gmail.com>
> >> wrote:
> >>
> >> > For HBase we have a separated repo for hbase-thirdparty
> >> >
> >> > https://github.com/apache/hbase-thirdparty
> >> >
> >> > We will publish the artifacts to nexus so we do not need to include
> >> > binaries in our git repo, just add a dependency in the pom.
> >> >
> >> >
> >> >
> >>
> https://mvnrepository.com/artifact/org.apache.hbase.thirdparty/hbase-shaded-protobuf
> >> >
> >> >
> >> > And it has its own release cycles, only when there are special
> >> requirements
> >> > or we want to upgrade some of the dependencies. This is the vote
> thread
> >> for
> >> > the newest release, where we want to provide a shaded gson for jdk7.
> >> >
> >> >
> >> >
> >>
> https://lists.apache.org/thread.html/f12c589baabbc79c7fb2843422d4590bea982cd102e2bd9d21e9884b@%3Cdev.hbase.apache.org%3E
> >> >
> >> >
> >> > Thanks.
> >> >
> >> > Vinayakumar B <vinayakumarb@apache.org> 于2019年9月28日周六
上午1:28写道:
> >> >
> >> > > Please find replies inline.
> >> > >
> >> > > -Vinay
> >> > >
> >> > > On Fri, Sep 27, 2019 at 10:21 PM Owen O'Malley <
> >> owen.omalley@gmail.com>
> >> > > wrote:
> >> > >
> >> > > > I'm very unhappy with this direction. In particular, I don't
think
> >> git
> >> > is
> >> > > > a good place for distribution of binary artifacts. Furthermore,
> the
> >> PMC
> >> > > > shouldn't be releasing anything without a release vote.
> >> > > >
> >> > > >
> >> > > Proposed solution doesnt release any binaries in git. Its actually
a
> >> > > complete sub-project which follows entire release process, including
> >> VOTE
> >> > > in public. I have mentioned already that release process is similar
> to
> >> > > hadoop.
> >> > > To be specific, using the (almost) same script used in hadoop to
> >> generate
> >> > > artifacts, sign and deploy to staging repository. Please let me know
> >> If I
> >> > > am conveying anything wrong.
> >> > >
> >> > >
> >> > > > I'd propose that we make a third party module that contains the
> >> > *source*
> >> > > > of the pom files to build the relocated jars. This should
> >> absolutely be
> >> > > > treated as a last resort for the mostly Google projects that
> >> regularly
> >> > > > break binary compatibility (eg. Protobuf & Guava).
> >> > > >
> >> > > >
> >> > > Same has been implemented in the PR
> >> > > https://github.com/apache/hadoop-thirdparty/pull/1. Please check
> and
> >> let
> >> > > me
> >> > > know If I misunderstood. Yes, this is the last option we have AFAIK.
> >> > >
> >> > >
> >> > > > In terms of naming, I'd propose something like:
> >> > > >
> >> > > > org.apache.hadoop.thirdparty.protobuf2_5
> >> > > > org.apache.hadoop.thirdparty.guava28
> >> > > >
> >> > > > In particular, I think we absolutely need to include the version
> of
> >> the
> >> > > > underlying project. On the other hand, since we should not be
> >> shading
> >> > > > *everything* we can drop the leading com.google.
> >> > > >
> >> > > >
> >> > > IMO, This naming convention is easy for identifying the underlying
> >> > project,
> >> > > but  it will be difficult to maintain going forward if underlying
> >> project
> >> > > versions changes. Since thirdparty module have its own releases,
> each
> >> of
> >> > > those release can be mapped to specific version of underlying
> project.
> >> > Even
> >> > > the binary artifact can include a MANIFEST with underlying project
> >> > details
> >> > > as per Steve's suggestion on HADOOP-13363.
> >> > > That said, if you still prefer to have project number in artifact
> id,
> >> it
> >> > > can be done.
> >> > >
> >> > > The Hadoop project can make releases of  the thirdparty module:
> >> > > >
> >> > > > <dependency>
> >> > > >  <groupId>org.apache.hadoop</groupId>
> >> > > >  <artifactId>hadoop-thirdparty-protobuf25</artifactId>
> >> > > >  <version>1.0</version>
> >> > > > </dependency>
> >> > > >
> >> > > >
> >> > > Note that the version has to be the hadoop thirdparty release
> number,
> >> > which
> >> > > > is part of why you need to have the underlying version in the
> >> artifact
> >> > > > name. These we can push to maven central as new releases from
> >> Hadoop.
> >> > > >
> >> > > >
> >> > > Exactly, same has been implemented in the PR. hadoop-thirdparty
> module
> >> > have
> >> > > its own releases. But in HADOOP Jira, thirdparty versions can be
> >> > > differentiated using prefix "thirdparty-".
> >> > >
> >> > > Same solution is being followed in HBase. May be people involved in
> >> HBase
> >> > > can add some points here.
> >> > >
> >> > > Thoughts?
> >> > > >
> >> > > > .. Owen
> >> > > >
> >> > > > On Fri, Sep 27, 2019 at 8:38 AM Vinayakumar B <
> >> vinayakumarb@apache.org
> >> > >
> >> > > > wrote:
> >> > > >
> >> > > >> Hi All,
> >> > > >>
> >> > > >>    I wanted to discuss about the separate repo for thirdparty
> >> > > dependencies
> >> > > >> which we need to shaded and include in Hadoop component's
jars.
> >> > > >>
> >> > > >>    Apologies for the big text ahead, but this needs clear
> >> > explanation!!
> >> > > >>
> >> > > >>    Right now most needed such dependency is protobuf. Protobuf
> >> > > dependency
> >> > > >> was not upgraded from 2.5.0 onwards with the fear that downstream
> >> > > builds,
> >> > > >> which depends on transitive dependency protobuf coming from
> >> hadoop's
> >> > > jars,
> >> > > >> may fail with the upgrade. Apparently protobuf does not guarantee
> >> > source
> >> > > >> compatibility, though it guarantees wire compatibility between
> >> > versions.
> >> > > >> Because of this behavior, version upgrade may cause breakage
in
> >> known
> >> > > and
> >> > > >> unknown (private?) downstreams.
> >> > > >>
> >> > > >>    So to tackle this, we came up the following proposal in
> >> > HADOOP-13363.
> >> > > >>
> >> > > >>    Luckily, As far as I know, no APIs, either public to user
or
> >> > between
> >> > > >> Hadoop processes, is not directly using protobuf classes
in
> >> > signatures.
> >> > > >> (If
> >> > > >> any exist, please let us know).
> >> > > >>
> >> > > >>    Proposal:
> >> > > >>    ------------
> >> > > >>
> >> > > >>    1. Create a artifact(s) which contains shaded dependencies.
> All
> >> > such
> >> > > >> shading/relocation will be with known prefix
> >> > > >> **org.apache.hadoop.thirdparty.**.
> >> > > >>    2. Right now protobuf jar (ex:
> >> > > o.a.h.thirdparty:hadoop-shaded-protobuf)
> >> > > >> to start with, all **com.google.protobuf** classes will be
> >> relocated
> >> > as
> >> > > >> **org.apache.hadoop.thirdparty.com.google.protobuf**.
> >> > > >>    3. Hadoop modules, which needs protobuf as dependency,
will
> add
> >> > this
> >> > > >> shaded artifact as dependency (ex:
> >> > > >> o.a.h.thirdparty:hadoop-shaded-protobuf).
> >> > > >>    4. All previous usages of "com.google.protobuf" will be
> >> relocated
> >> > to
> >> > > >> "org.apache.hadoop.thirdparty.com.google.protobuf" in the
code
> and
> >> > will
> >> > > be
> >> > > >> committed. Please note, this replacement is One-Time directly
in
> >> > source
> >> > > >> code, NOT during compile and package.
> >> > > >>    5. Once all usages of "com.google.protobuf" is relocated,
then
> >> > hadoop
> >> > > >> dont care about which version of original  "protobuf-java"
is in
> >> > > >> dependency.
> >> > > >>    6. Just keep "protobuf-java:2.5.0" in dependency tree
not to
> >> break
> >> > > the
> >> > > >> downstreams. But hadoop will be originally using the latest
> >> protobuf
> >> > > >> present in "o.a.h.thirdparty:hadoop-shaded-protobuf".
> >> > > >>
> >> > > >>    7. Coming back to separate repo, Following are most
> appropriate
> >> > > reasons
> >> > > >> of keeping shaded dependency artifact in separate repo instead
of
> >> > > >> submodule.
> >> > > >>
> >> > > >>      7a. These artifacts need not be built all the time.
It needs
> >> to
> >> > be
> >> > > >> built only when there is a change in the dependency version
or
> the
> >> > build
> >> > > >> process.
> >> > > >>      7b. If added as "submodule in Hadoop repo",
> >> > > maven-shade-plugin:shade
> >> > > >> will execute only in package phase. That means, "mvn compile"
or
> >> "mvn
> >> > > >> test-compile" will not be failed as this artifact will not
have
> >> > > relocated
> >> > > >> classes, instead it will have original classes, resulting
in
> >> > compilation
> >> > > >> failure. Workaround, build thirdparty submodule first and
exclude
> >> > > >> "thirdparty" submodule in other executions. This will be
a
> complex
> >> > > process
> >> > > >> compared to keeping in a separate repo.
> >> > > >>
> >> > > >>      7c. Separate repo, will be a subproject of Hadoop, using
the
> >> > same
> >> > > >> HADOOP jira project, with different versioning prefixed with
> >> > > "thirdparty-"
> >> > > >> (ex: thirdparty-1.0.0).
> >> > > >>      7d. Separate will have same release process as Hadoop.
> >> > > >>
> >> > > >>    HADOOP-13363 (
> >> https://issues.apache.org/jira/browse/HADOOP-13363)
> >> > > is
> >> > > >> an
> >> > > >> umbrella jira tracking the changes to protobuf upgrade.
> >> > > >>
> >> > > >>    PR (https://github.com/apache/hadoop-thirdparty/pull/1)
has
> >> been
> >> > > >> raised
> >> > > >> for separate repo creation in (HADOOP-16595 (
> >> > > >> https://issues.apache.org/jira/browse/HADOOP-16595)
> >> > > >>
> >> > > >>    Please provide your inputs for the proposal and review
the PR
> >> to
> >> > > >> proceed with the proposal.
> >> > > >>
> >> > > >>
> >> > > >    -Thanks,
> >> > > >>    Vinay
> >> > > >>
> >> > > >> On Fri, Sep 27, 2019 at 11:54 AM Vinod Kumar Vavilapalli
<
> >> > > >> vinodkv@apache.org>
> >> > > >> wrote:
> >> > > >>
> >> > > >> > Moving the thread to the dev lists.
> >> > > >> >
> >> > > >> > Thanks
> >> > > >> > +Vinod
> >> > > >> >
> >> > > >> > > On Sep 23, 2019, at 11:43 PM, Vinayakumar B <
> >> > > vinayakumarb@apache.org>
> >> > > >> > wrote:
> >> > > >> > >
> >> > > >> > > Thanks Marton,
> >> > > >> > >
> >> > > >> > > Current created 'hadoop-thirdparty' repo is empty
right now.
> >> > > >> > > Whether to use that repo  for shaded artifact or
not will be
> >> > > >> monitored in
> >> > > >> > > HADOOP-13363 umbrella jira. Please feel free to
join the
> >> > discussion.
> >> > > >> > >
> >> > > >> > > There is no existing codebase is being moved out
of hadoop
> >> repo.
> >> > So
> >> > > I
> >> > > >> > think
> >> > > >> > > right now we are good to go.
> >> > > >> > >
> >> > > >> > > -Vinay
> >> > > >> > >
> >> > > >> > > On Mon, Sep 23, 2019 at 11:38 PM Marton Elek <
> elek@apache.org>
> >> > > wrote:
> >> > > >> > >
> >> > > >> > >>
> >> > > >> > >> I am not sure if it's defined when is a vote
required.
> >> > > >> > >>
> >> > > >> > >> https://www.apache.org/foundation/voting.html
> >> > > >> > >>
> >> > > >> > >> Personally I think it's a big enough change
to send a
> >> > notification
> >> > > to
> >> > > >> > the
> >> > > >> > >> dev lists with a 'lazy consensus'  closure
> >> > > >> > >>
> >> > > >> > >> Marton
> >> > > >> > >>
> >> > > >> > >> On 2019/09/23 17:46:37, Vinayakumar B <
> >> vinayakumarb@apache.org>
> >> > > >> wrote:
> >> > > >> > >>> Hi,
> >> > > >> > >>>
> >> > > >> > >>> As discussed in HADOOP-13363, protobuf
3.x jar (and may be
> >> more
> >> > in
> >> > > >> > >> future)
> >> > > >> > >>> will be kept as a shaded artifact in a
separate repo, which
> >> will
> >> > > be
> >> > > >> > >>> referred as dependency in hadoop modules.
 This approach
> >> avoids
> >> > > >> shading
> >> > > >> > >> of
> >> > > >> > >>> every submodule during build.
> >> > > >> > >>>
> >> > > >> > >>> So question is does any VOTE required before
asking to
> >> create a
> >> > > git
> >> > > >> > repo?
> >> > > >> > >>>
> >> > > >> > >>> On selfserve platform
> >> > > https://gitbox.apache.org/setup/newrepo.html
> >> > > >> > >>> I can access see that, requester should
be PMC.
> >> > > >> > >>>
> >> > > >> > >>> Wanted to confirm here first.
> >> > > >> > >>>
> >> > > >> > >>> -Vinay
> >> > > >> > >>>
> >> > > >> > >>
> >> > > >> > >>
> >> > >
> ---------------------------------------------------------------------
> >> > > >> > >> To unsubscribe, e-mail:
> private-unsubscribe@hadoop.apache.org
> >> > > >> > >> For additional commands, e-mail:
> >> private-help@hadoop.apache.org
> >> > > >> > >>
> >> > > >> > >>
> >> > > >> >
> >> > > >> >
> >> > > >>
> >> > > >
> >> > >
> >> >
> >>
> >

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