[ANNOUNCE] Apache ZooKeeper 3.5.3-beta

[Michael Han <ha...@cloudera.com>]

The Apache ZooKeeper team is proud to announce Apache ZooKeeper version
*3.5.3-beta*.

ZooKeeper is a high-performance coordination service for distributed
applications. It exposes common services - such as naming,
configuration management, synchronization, and group services - in a
simple interface so you don't have to write them from scratch. You can
use it off-the-shelf to implement consensus, group management, leader
election, and presence protocols. And you can build on it for your
own, specific needs.

For ZooKeeper release details and downloads, visit:
https://zookeeper.apache.org/releases.html

ZooKeeper 3.5.3-beta Release Notes are at:
https://zookeeper.apache.org/doc/r3.5.3-beta/releasenotes.html

We would like to thank the contributors that made the release possible.

Regards,

The ZooKeeper Team

Re: [ANNOUNCE] Apache ZooKeeper 3.5.3-beta

[Alexander Shraer <sh...@gmail.com>]

The issue Patrick was referring to is described here:
https://zookeeper.apache.org/doc/trunk/zookeeperReconfig.html#ch_reconfig_upgrade

On Thu, Apr 20, 2017 at 9:22 AM, Patrick Hunt <ph...@apache.org> wrote:

> On Thu, Apr 20, 2017 at 9:12 AM, Michael Han <ha...@cloudera.com> wrote:
>
> > Just to clarify, 4LW feature is not removed in latest releases (3.4.10
> and
> > 3.5.3-beta). The feature is still there, it's just disabled by default.
> You
> > can enable the feature if you need it (details in the admin documents).
> > Because of the compatibility guarantees provided by ZooKeeper, we
> wouldn't
> > just remove a feature lightly.
> >
> >
> 3.5 also adds json support through jetty/http, a significant improvement
> over 4lw.
>
> Patrick
>
>
> > On Thu, Apr 20, 2017 at 6:53 AM, Ben Sherman <be...@gmail.com>
> wrote:
> >
> > > Thanks for the 4lw warning - I was going to upgrade to 3.4.10 today but
> > > didn't expect features to be removed.  It's a shame they are going
> away,
> > > human readable output from a one line script was a nice feature to have
> > by
> > > default.
> > >
> > > On Wed, Apr 19, 2017 at 6:02 PM, Michael Han <ha...@cloudera.com>
> wrote:
> > >
> > > > >> pitfalls coming from 3.4.9 (or .10) to the 3.5.x release?
> > > > If coming from 3.4.9, one note is all four letter words except srvr
> are
> > > > disabled by default in 3.5.3 so your devops tool if they depend on
> 4lw
> > > will
> > > > stop working (one user already reports this on jira), which is
> > expected.
> > > In
> > > > this case you can either update configuration to enable the subset of
> > 4lw
> > > > you need, or use modern monitoring primitives provided by ZK (JMX /
> > Jetty
> > > > admin server). If coming from 3.4.10 then it's fine, since 3.4.10
> made
> > > same
> > > > change to 4lw (disable by default).
> > > >
> > > > >> make a change to 3.4.x (x>0) in order to maintain backward compat
> > > with a
> > > > change that we made to 3.5.
> > > > Not sure if it's ZOOKEEPER-1633. Basically rolling upgrade would not
> > work
> > > > from 3.4.x to 3.5.y if x < 6.
> > > >
> > > > On Wed, Apr 19, 2017 at 5:16 PM, Patrick Hunt <ph...@apache.org>
> > wrote:
> > > >
> > > > > I remember we had to make a change to 3.4.x (x>0) in order to
> > maintain
> > > > > backward compat with a change that we made to 3.5. I searched but I
> > > can't
> > > > > remember the specific jira or the specific release, it was some
> time
> > > ago.
> > > > > The issue would be that if you try and do a rolling upgrade from
> > > 3.4.x-1
> > > > to
> > > > > 3.5.y it had the potential to fail. Perhaps one of the other
> > community
> > > > > folks will remember. Other than that I'm not aware of anything. The
> > on
> > > > disk
> > > > > formats are the same and the communication protocols should be b/w
> > > > compat.
> > > > > I tried running 3.4 client against 3.5.3 during the last release
> and
> > it
> > > > > worked ok for me. Not sure if anyone has been testing at the quorum
> > > > level.
> > > > >
> > > > > If anyone does find something (or tests and finds it works) please
> > let
> > > us
> > > > > know so that we can document it.
> > > > >
> > > > > Patrick
> > > > >
> > > > > On Wed, Apr 19, 2017 at 4:14 PM, Ben Sherman <bensherman@gmail.com
> >
> > > > wrote:
> > > > >
> > > > > > Great news, are there any docs written yet or any known pitfalls
> > > coming
> > > > > > from 3.4.9 (or .10) to the 3.5.x release?
> > > > > >
> > > > > > On Mon, Apr 17, 2017 at 10:48 AM, Michael Han <hanm@cloudera.com
> >
> > > > wrote:
> > > > > >
> > > > > > > The Apache ZooKeeper team is proud to announce Apache ZooKeeper
> > > > version
> > > > > > > *3.5.3-beta*.
> > > > > > >
> > > > > > > ZooKeeper is a high-performance coordination service for
> > > distributed
> > > > > > > applications. It exposes common services - such as naming,
> > > > > > > configuration management, synchronization, and group services -
> > in
> > > a
> > > > > > > simple interface so you don't have to write them from scratch.
> > You
> > > > can
> > > > > > > use it off-the-shelf to implement consensus, group management,
> > > leader
> > > > > > > election, and presence protocols. And you can build on it for
> > your
> > > > > > > own, specific needs.
> > > > > > >
> > > > > > > For ZooKeeper release details and downloads, visit:
> > > > > > > https://zookeeper.apache.org/releases.html
> > > > > > >
> > > > > > > ZooKeeper 3.5.3-beta Release Notes are at:
> > > > > > > https://zookeeper.apache.org/doc/r3.5.3-beta/releasenotes.html
> > > > > > >
> > > > > > > We would like to thank the contributors that made the release
> > > > possible.
> > > > > > >
> > > > > > > Regards,
> > > > > > >
> > > > > > > The ZooKeeper Team
> > > > > > >
> > > > > >
> > > > >
> > > >
> > > >
> > > >
> > > > --
> > > > Cheers
> > > > Michael.
> > > >
> > >
> >
> >
> >
> > --
> > Cheers
> > Michael.
> >
>

Re: [ANNOUNCE] Apache ZooKeeper 3.5.3-beta

[Patrick Hunt <ph...@apache.org>]

On Thu, Apr 20, 2017 at 9:12 AM, Michael Han <ha...@cloudera.com> wrote:

> Just to clarify, 4LW feature is not removed in latest releases (3.4.10 and
> 3.5.3-beta). The feature is still there, it's just disabled by default. You
> can enable the feature if you need it (details in the admin documents).
> Because of the compatibility guarantees provided by ZooKeeper, we wouldn't
> just remove a feature lightly.
>
>
3.5 also adds json support through jetty/http, a significant improvement
over 4lw.

Patrick


> On Thu, Apr 20, 2017 at 6:53 AM, Ben Sherman <be...@gmail.com> wrote:
>
> > Thanks for the 4lw warning - I was going to upgrade to 3.4.10 today but
> > didn't expect features to be removed.  It's a shame they are going away,
> > human readable output from a one line script was a nice feature to have
> by
> > default.
> >
> > On Wed, Apr 19, 2017 at 6:02 PM, Michael Han <ha...@cloudera.com> wrote:
> >
> > > >> pitfalls coming from 3.4.9 (or .10) to the 3.5.x release?
> > > If coming from 3.4.9, one note is all four letter words except srvr are
> > > disabled by default in 3.5.3 so your devops tool if they depend on 4lw
> > will
> > > stop working (one user already reports this on jira), which is
> expected.
> > In
> > > this case you can either update configuration to enable the subset of
> 4lw
> > > you need, or use modern monitoring primitives provided by ZK (JMX /
> Jetty
> > > admin server). If coming from 3.4.10 then it's fine, since 3.4.10 made
> > same
> > > change to 4lw (disable by default).
> > >
> > > >> make a change to 3.4.x (x>0) in order to maintain backward compat
> > with a
> > > change that we made to 3.5.
> > > Not sure if it's ZOOKEEPER-1633. Basically rolling upgrade would not
> work
> > > from 3.4.x to 3.5.y if x < 6.
> > >
> > > On Wed, Apr 19, 2017 at 5:16 PM, Patrick Hunt <ph...@apache.org>
> wrote:
> > >
> > > > I remember we had to make a change to 3.4.x (x>0) in order to
> maintain
> > > > backward compat with a change that we made to 3.5. I searched but I
> > can't
> > > > remember the specific jira or the specific release, it was some time
> > ago.
> > > > The issue would be that if you try and do a rolling upgrade from
> > 3.4.x-1
> > > to
> > > > 3.5.y it had the potential to fail. Perhaps one of the other
> community
> > > > folks will remember. Other than that I'm not aware of anything. The
> on
> > > disk
> > > > formats are the same and the communication protocols should be b/w
> > > compat.
> > > > I tried running 3.4 client against 3.5.3 during the last release and
> it
> > > > worked ok for me. Not sure if anyone has been testing at the quorum
> > > level.
> > > >
> > > > If anyone does find something (or tests and finds it works) please
> let
> > us
> > > > know so that we can document it.
> > > >
> > > > Patrick
> > > >
> > > > On Wed, Apr 19, 2017 at 4:14 PM, Ben Sherman <be...@gmail.com>
> > > wrote:
> > > >
> > > > > Great news, are there any docs written yet or any known pitfalls
> > coming
> > > > > from 3.4.9 (or .10) to the 3.5.x release?
> > > > >
> > > > > On Mon, Apr 17, 2017 at 10:48 AM, Michael Han <ha...@cloudera.com>
> > > wrote:
> > > > >
> > > > > > The Apache ZooKeeper team is proud to announce Apache ZooKeeper
> > > version
> > > > > > *3.5.3-beta*.
> > > > > >
> > > > > > ZooKeeper is a high-performance coordination service for
> > distributed
> > > > > > applications. It exposes common services - such as naming,
> > > > > > configuration management, synchronization, and group services -
> in
> > a
> > > > > > simple interface so you don't have to write them from scratch.
> You
> > > can
> > > > > > use it off-the-shelf to implement consensus, group management,
> > leader
> > > > > > election, and presence protocols. And you can build on it for
> your
> > > > > > own, specific needs.
> > > > > >
> > > > > > For ZooKeeper release details and downloads, visit:
> > > > > > https://zookeeper.apache.org/releases.html
> > > > > >
> > > > > > ZooKeeper 3.5.3-beta Release Notes are at:
> > > > > > https://zookeeper.apache.org/doc/r3.5.3-beta/releasenotes.html
> > > > > >
> > > > > > We would like to thank the contributors that made the release
> > > possible.
> > > > > >
> > > > > > Regards,
> > > > > >
> > > > > > The ZooKeeper Team
> > > > > >
> > > > >
> > > >
> > >
> > >
> > >
> > > --
> > > Cheers
> > > Michael.
> > >
> >
>
>
>
> --
> Cheers
> Michael.
>

Re: [ANNOUNCE] Apache ZooKeeper 3.5.3-beta

[Michael Han <ha...@cloudera.com>]

Just to clarify, 4LW feature is not removed in latest releases (3.4.10 and
3.5.3-beta). The feature is still there, it's just disabled by default. You
can enable the feature if you need it (details in the admin documents).
Because of the compatibility guarantees provided by ZooKeeper, we wouldn't
just remove a feature lightly.

On Thu, Apr 20, 2017 at 6:53 AM, Ben Sherman <be...@gmail.com> wrote:

> Thanks for the 4lw warning - I was going to upgrade to 3.4.10 today but
> didn't expect features to be removed.  It's a shame they are going away,
> human readable output from a one line script was a nice feature to have by
> default.
>
> On Wed, Apr 19, 2017 at 6:02 PM, Michael Han <ha...@cloudera.com> wrote:
>
> > >> pitfalls coming from 3.4.9 (or .10) to the 3.5.x release?
> > If coming from 3.4.9, one note is all four letter words except srvr are
> > disabled by default in 3.5.3 so your devops tool if they depend on 4lw
> will
> > stop working (one user already reports this on jira), which is expected.
> In
> > this case you can either update configuration to enable the subset of 4lw
> > you need, or use modern monitoring primitives provided by ZK (JMX / Jetty
> > admin server). If coming from 3.4.10 then it's fine, since 3.4.10 made
> same
> > change to 4lw (disable by default).
> >
> > >> make a change to 3.4.x (x>0) in order to maintain backward compat
> with a
> > change that we made to 3.5.
> > Not sure if it's ZOOKEEPER-1633. Basically rolling upgrade would not work
> > from 3.4.x to 3.5.y if x < 6.
> >
> > On Wed, Apr 19, 2017 at 5:16 PM, Patrick Hunt <ph...@apache.org> wrote:
> >
> > > I remember we had to make a change to 3.4.x (x>0) in order to maintain
> > > backward compat with a change that we made to 3.5. I searched but I
> can't
> > > remember the specific jira or the specific release, it was some time
> ago.
> > > The issue would be that if you try and do a rolling upgrade from
> 3.4.x-1
> > to
> > > 3.5.y it had the potential to fail. Perhaps one of the other community
> > > folks will remember. Other than that I'm not aware of anything. The on
> > disk
> > > formats are the same and the communication protocols should be b/w
> > compat.
> > > I tried running 3.4 client against 3.5.3 during the last release and it
> > > worked ok for me. Not sure if anyone has been testing at the quorum
> > level.
> > >
> > > If anyone does find something (or tests and finds it works) please let
> us
> > > know so that we can document it.
> > >
> > > Patrick
> > >
> > > On Wed, Apr 19, 2017 at 4:14 PM, Ben Sherman <be...@gmail.com>
> > wrote:
> > >
> > > > Great news, are there any docs written yet or any known pitfalls
> coming
> > > > from 3.4.9 (or .10) to the 3.5.x release?
> > > >
> > > > On Mon, Apr 17, 2017 at 10:48 AM, Michael Han <ha...@cloudera.com>
> > wrote:
> > > >
> > > > > The Apache ZooKeeper team is proud to announce Apache ZooKeeper
> > version
> > > > > *3.5.3-beta*.
> > > > >
> > > > > ZooKeeper is a high-performance coordination service for
> distributed
> > > > > applications. It exposes common services - such as naming,
> > > > > configuration management, synchronization, and group services - in
> a
> > > > > simple interface so you don't have to write them from scratch. You
> > can
> > > > > use it off-the-shelf to implement consensus, group management,
> leader
> > > > > election, and presence protocols. And you can build on it for your
> > > > > own, specific needs.
> > > > >
> > > > > For ZooKeeper release details and downloads, visit:
> > > > > https://zookeeper.apache.org/releases.html
> > > > >
> > > > > ZooKeeper 3.5.3-beta Release Notes are at:
> > > > > https://zookeeper.apache.org/doc/r3.5.3-beta/releasenotes.html
> > > > >
> > > > > We would like to thank the contributors that made the release
> > possible.
> > > > >
> > > > > Regards,
> > > > >
> > > > > The ZooKeeper Team
> > > > >
> > > >
> > >
> >
> >
> >
> > --
> > Cheers
> > Michael.
> >
>



-- 
Cheers
Michael.

Re: [ANNOUNCE] Apache ZooKeeper 3.5.3-beta

[Ben Sherman <be...@gmail.com>]

Thanks for the 4lw warning - I was going to upgrade to 3.4.10 today but
didn't expect features to be removed.  It's a shame they are going away,
human readable output from a one line script was a nice feature to have by
default.

On Wed, Apr 19, 2017 at 6:02 PM, Michael Han <ha...@cloudera.com> wrote:

> >> pitfalls coming from 3.4.9 (or .10) to the 3.5.x release?
> If coming from 3.4.9, one note is all four letter words except srvr are
> disabled by default in 3.5.3 so your devops tool if they depend on 4lw will
> stop working (one user already reports this on jira), which is expected. In
> this case you can either update configuration to enable the subset of 4lw
> you need, or use modern monitoring primitives provided by ZK (JMX / Jetty
> admin server). If coming from 3.4.10 then it's fine, since 3.4.10 made same
> change to 4lw (disable by default).
>
> >> make a change to 3.4.x (x>0) in order to maintain backward compat with a
> change that we made to 3.5.
> Not sure if it's ZOOKEEPER-1633. Basically rolling upgrade would not work
> from 3.4.x to 3.5.y if x < 6.
>
> On Wed, Apr 19, 2017 at 5:16 PM, Patrick Hunt <ph...@apache.org> wrote:
>
> > I remember we had to make a change to 3.4.x (x>0) in order to maintain
> > backward compat with a change that we made to 3.5. I searched but I can't
> > remember the specific jira or the specific release, it was some time ago.
> > The issue would be that if you try and do a rolling upgrade from 3.4.x-1
> to
> > 3.5.y it had the potential to fail. Perhaps one of the other community
> > folks will remember. Other than that I'm not aware of anything. The on
> disk
> > formats are the same and the communication protocols should be b/w
> compat.
> > I tried running 3.4 client against 3.5.3 during the last release and it
> > worked ok for me. Not sure if anyone has been testing at the quorum
> level.
> >
> > If anyone does find something (or tests and finds it works) please let us
> > know so that we can document it.
> >
> > Patrick
> >
> > On Wed, Apr 19, 2017 at 4:14 PM, Ben Sherman <be...@gmail.com>
> wrote:
> >
> > > Great news, are there any docs written yet or any known pitfalls coming
> > > from 3.4.9 (or .10) to the 3.5.x release?
> > >
> > > On Mon, Apr 17, 2017 at 10:48 AM, Michael Han <ha...@cloudera.com>
> wrote:
> > >
> > > > The Apache ZooKeeper team is proud to announce Apache ZooKeeper
> version
> > > > *3.5.3-beta*.
> > > >
> > > > ZooKeeper is a high-performance coordination service for distributed
> > > > applications. It exposes common services - such as naming,
> > > > configuration management, synchronization, and group services - in a
> > > > simple interface so you don't have to write them from scratch. You
> can
> > > > use it off-the-shelf to implement consensus, group management, leader
> > > > election, and presence protocols. And you can build on it for your
> > > > own, specific needs.
> > > >
> > > > For ZooKeeper release details and downloads, visit:
> > > > https://zookeeper.apache.org/releases.html
> > > >
> > > > ZooKeeper 3.5.3-beta Release Notes are at:
> > > > https://zookeeper.apache.org/doc/r3.5.3-beta/releasenotes.html
> > > >
> > > > We would like to thank the contributors that made the release
> possible.
> > > >
> > > > Regards,
> > > >
> > > > The ZooKeeper Team
> > > >
> > >
> >
>
>
>
> --
> Cheers
> Michael.
>

Re: [ANNOUNCE] Apache ZooKeeper 3.5.3-beta

[Michael Han <ha...@cloudera.com>]

>> pitfalls coming from 3.4.9 (or .10) to the 3.5.x release?
If coming from 3.4.9, one note is all four letter words except srvr are
disabled by default in 3.5.3 so your devops tool if they depend on 4lw will
stop working (one user already reports this on jira), which is expected. In
this case you can either update configuration to enable the subset of 4lw
you need, or use modern monitoring primitives provided by ZK (JMX / Jetty
admin server). If coming from 3.4.10 then it's fine, since 3.4.10 made same
change to 4lw (disable by default).

>> make a change to 3.4.x (x>0) in order to maintain backward compat with a
change that we made to 3.5.
Not sure if it's ZOOKEEPER-1633. Basically rolling upgrade would not work
from 3.4.x to 3.5.y if x < 6.

On Wed, Apr 19, 2017 at 5:16 PM, Patrick Hunt <ph...@apache.org> wrote:

> I remember we had to make a change to 3.4.x (x>0) in order to maintain
> backward compat with a change that we made to 3.5. I searched but I can't
> remember the specific jira or the specific release, it was some time ago.
> The issue would be that if you try and do a rolling upgrade from 3.4.x-1 to
> 3.5.y it had the potential to fail. Perhaps one of the other community
> folks will remember. Other than that I'm not aware of anything. The on disk
> formats are the same and the communication protocols should be b/w compat.
> I tried running 3.4 client against 3.5.3 during the last release and it
> worked ok for me. Not sure if anyone has been testing at the quorum level.
>
> If anyone does find something (or tests and finds it works) please let us
> know so that we can document it.
>
> Patrick
>
> On Wed, Apr 19, 2017 at 4:14 PM, Ben Sherman <be...@gmail.com> wrote:
>
> > Great news, are there any docs written yet or any known pitfalls coming
> > from 3.4.9 (or .10) to the 3.5.x release?
> >
> > On Mon, Apr 17, 2017 at 10:48 AM, Michael Han <ha...@cloudera.com> wrote:
> >
> > > The Apache ZooKeeper team is proud to announce Apache ZooKeeper version
> > > *3.5.3-beta*.
> > >
> > > ZooKeeper is a high-performance coordination service for distributed
> > > applications. It exposes common services - such as naming,
> > > configuration management, synchronization, and group services - in a
> > > simple interface so you don't have to write them from scratch. You can
> > > use it off-the-shelf to implement consensus, group management, leader
> > > election, and presence protocols. And you can build on it for your
> > > own, specific needs.
> > >
> > > For ZooKeeper release details and downloads, visit:
> > > https://zookeeper.apache.org/releases.html
> > >
> > > ZooKeeper 3.5.3-beta Release Notes are at:
> > > https://zookeeper.apache.org/doc/r3.5.3-beta/releasenotes.html
> > >
> > > We would like to thank the contributors that made the release possible.
> > >
> > > Regards,
> > >
> > > The ZooKeeper Team
> > >
> >
>



-- 
Cheers
Michael.

Re: [ANNOUNCE] Apache ZooKeeper 3.5.3-beta

[Patrick Hunt <ph...@apache.org>]

I remember we had to make a change to 3.4.x (x>0) in order to maintain
backward compat with a change that we made to 3.5. I searched but I can't
remember the specific jira or the specific release, it was some time ago.
The issue would be that if you try and do a rolling upgrade from 3.4.x-1 to
3.5.y it had the potential to fail. Perhaps one of the other community
folks will remember. Other than that I'm not aware of anything. The on disk
formats are the same and the communication protocols should be b/w compat.
I tried running 3.4 client against 3.5.3 during the last release and it
worked ok for me. Not sure if anyone has been testing at the quorum level.

If anyone does find something (or tests and finds it works) please let us
know so that we can document it.

Patrick

On Wed, Apr 19, 2017 at 4:14 PM, Ben Sherman <be...@gmail.com> wrote:

> Great news, are there any docs written yet or any known pitfalls coming
> from 3.4.9 (or .10) to the 3.5.x release?
>
> On Mon, Apr 17, 2017 at 10:48 AM, Michael Han <ha...@cloudera.com> wrote:
>
> > The Apache ZooKeeper team is proud to announce Apache ZooKeeper version
> > *3.5.3-beta*.
> >
> > ZooKeeper is a high-performance coordination service for distributed
> > applications. It exposes common services - such as naming,
> > configuration management, synchronization, and group services - in a
> > simple interface so you don't have to write them from scratch. You can
> > use it off-the-shelf to implement consensus, group management, leader
> > election, and presence protocols. And you can build on it for your
> > own, specific needs.
> >
> > For ZooKeeper release details and downloads, visit:
> > https://zookeeper.apache.org/releases.html
> >
> > ZooKeeper 3.5.3-beta Release Notes are at:
> > https://zookeeper.apache.org/doc/r3.5.3-beta/releasenotes.html
> >
> > We would like to thank the contributors that made the release possible.
> >
> > Regards,
> >
> > The ZooKeeper Team
> >
>

Re: [ANNOUNCE] Apache ZooKeeper 3.5.3-beta

[Ben Sherman <be...@gmail.com>]

Great news, are there any docs written yet or any known pitfalls coming
from 3.4.9 (or .10) to the 3.5.x release?

On Mon, Apr 17, 2017 at 10:48 AM, Michael Han <ha...@cloudera.com> wrote:

> The Apache ZooKeeper team is proud to announce Apache ZooKeeper version
> *3.5.3-beta*.
>
> ZooKeeper is a high-performance coordination service for distributed
> applications. It exposes common services - such as naming,
> configuration management, synchronization, and group services - in a
> simple interface so you don't have to write them from scratch. You can
> use it off-the-shelf to implement consensus, group management, leader
> election, and presence protocols. And you can build on it for your
> own, specific needs.
>
> For ZooKeeper release details and downloads, visit:
> https://zookeeper.apache.org/releases.html
>
> ZooKeeper 3.5.3-beta Release Notes are at:
> https://zookeeper.apache.org/doc/r3.5.3-beta/releasenotes.html
>
> We would like to thank the contributors that made the release possible.
>
> Regards,
>
> The ZooKeeper Team
>