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Posted to user@zookeeper.apache.org by rammohan ganapavarapu <ra...@gmail.com> on 2019/05/30 16:59:41 UTC
Dynamic Config
Hi,
I have few questions regarding dynamic reconfig feature,
1. this feature can only reconfigure the properties or configuration
defined in dynamic configuration file and not the configs in static default
zoo.cfg file?
2. What is the criteria to create version extension for dynamic config
file? ex: zoo.cfg.dynamic.100000000, i mean when does zk create new version
file, i have change a property in static file and restarted zk but it didnt
create new version file so it will only create new version when a config in
dynamic file changes?
3. How many copies/versions of these dynamic config files will get created
and is there a purge task that zk runs to cleanup older version files?
Thanks,
Ram
Re: Dynamic Config
Posted by rammohan ganapavarapu <ra...@gmail.com>.
Hi Alex,
Thanks, that helps a lot.
Ram
On Thu, May 30, 2019 at 11:27 AM Alexander Shraer <sh...@gmail.com> wrote:
> Hi,
>
> 1. Right - only the configuration parameters that live in the dynamic file
> are controlled by dynamic reconfig. The dynamic files are
> kept in sync across all the ZK servers, whereas the static files may not be
> the same.
>
> There is a backward compatibility mode, where you start up a server without
> a dynamic file, and ZK copies over whatever
> it can from the static to the dynamic file. From that point, you're not
> supposed to manually change the dynamic file - ZK
> manages that for you, and you only affect the configuration via reconfig
> commands.
>
> 2. Dynamic files are written out upon commit of new configurations created
> via reconfig, or, more precisely, when a server learns about such a commit.
> The number is the zxid of the commit.
>
> 3. I don't think there's any purge job that was implemented, so the old
> copies will
>
> 4. There is a fixed set of things that can live in the dynamic file. You
> can't just put anything there, because ZK still looks for other config
> parameters in the static file.
>
> Please see details in the manual:
> https://zookeeper.apache.org/doc/r3.5.5/zookeeperReconfig.html
>
> Thanks,
> Alex
>
> On Thu, May 30, 2019 at 10:49 AM rammohan ganapavarapu <
> rammohanganap@gmail.com> wrote:
>
> > Hi,
> >
> > One more question
> >
> > 4. Is there any list of configs that should be only in static file to
> boot
> > up the zookeeper? or can i have some thing like this?
> >
> > cat zoo.cfg
> > dynamicConfigFile=/opt/zookeeper/conf/dynamic.cfg
> >
> > cat dynamic.cfg
> > # All zookeeper configurations
> >
> > will this work?
> >
> > On Thu, May 30, 2019 at 9:59 AM rammohan ganapavarapu <
> > rammohanganap@gmail.com> wrote:
> >
> > > Hi,
> > >
> > > I have few questions regarding dynamic reconfig feature,
> > >
> > > 1. this feature can only reconfigure the properties or configuration
> > > defined in dynamic configuration file and not the configs in static
> > default
> > > zoo.cfg file?
> > > 2. What is the criteria to create version extension for dynamic config
> > > file? ex: zoo.cfg.dynamic.100000000, i mean when does zk create new
> > version
> > > file, i have change a property in static file and restarted zk but it
> > didnt
> > > create new version file so it will only create new version when a
> config
> > in
> > > dynamic file changes?
> > > 3. How many copies/versions of these dynamic config files will get
> > created
> > > and is there a purge task that zk runs to cleanup older version files?
> > >
> > >
> > >
> > > Thanks,
> > > Ram
> > >
> >
>
Re: Dynamic Config
Posted by Alexander Shraer <sh...@gmail.com>.
Hi,
1. Right - only the configuration parameters that live in the dynamic file
are controlled by dynamic reconfig. The dynamic files are
kept in sync across all the ZK servers, whereas the static files may not be
the same.
There is a backward compatibility mode, where you start up a server without
a dynamic file, and ZK copies over whatever
it can from the static to the dynamic file. From that point, you're not
supposed to manually change the dynamic file - ZK
manages that for you, and you only affect the configuration via reconfig
commands.
2. Dynamic files are written out upon commit of new configurations created
via reconfig, or, more precisely, when a server learns about such a commit.
The number is the zxid of the commit.
3. I don't think there's any purge job that was implemented, so the old
copies will
4. There is a fixed set of things that can live in the dynamic file. You
can't just put anything there, because ZK still looks for other config
parameters in the static file.
Please see details in the manual:
https://zookeeper.apache.org/doc/r3.5.5/zookeeperReconfig.html
Thanks,
Alex
On Thu, May 30, 2019 at 10:49 AM rammohan ganapavarapu <
rammohanganap@gmail.com> wrote:
> Hi,
>
> One more question
>
> 4. Is there any list of configs that should be only in static file to boot
> up the zookeeper? or can i have some thing like this?
>
> cat zoo.cfg
> dynamicConfigFile=/opt/zookeeper/conf/dynamic.cfg
>
> cat dynamic.cfg
> # All zookeeper configurations
>
> will this work?
>
> On Thu, May 30, 2019 at 9:59 AM rammohan ganapavarapu <
> rammohanganap@gmail.com> wrote:
>
> > Hi,
> >
> > I have few questions regarding dynamic reconfig feature,
> >
> > 1. this feature can only reconfigure the properties or configuration
> > defined in dynamic configuration file and not the configs in static
> default
> > zoo.cfg file?
> > 2. What is the criteria to create version extension for dynamic config
> > file? ex: zoo.cfg.dynamic.100000000, i mean when does zk create new
> version
> > file, i have change a property in static file and restarted zk but it
> didnt
> > create new version file so it will only create new version when a config
> in
> > dynamic file changes?
> > 3. How many copies/versions of these dynamic config files will get
> created
> > and is there a purge task that zk runs to cleanup older version files?
> >
> >
> >
> > Thanks,
> > Ram
> >
>
Re: Dynamic Config
Posted by rammohan ganapavarapu <ra...@gmail.com>.
Hi,
One more question
4. Is there any list of configs that should be only in static file to boot
up the zookeeper? or can i have some thing like this?
cat zoo.cfg
dynamicConfigFile=/opt/zookeeper/conf/dynamic.cfg
cat dynamic.cfg
# All zookeeper configurations
will this work?
On Thu, May 30, 2019 at 9:59 AM rammohan ganapavarapu <
rammohanganap@gmail.com> wrote:
> Hi,
>
> I have few questions regarding dynamic reconfig feature,
>
> 1. this feature can only reconfigure the properties or configuration
> defined in dynamic configuration file and not the configs in static default
> zoo.cfg file?
> 2. What is the criteria to create version extension for dynamic config
> file? ex: zoo.cfg.dynamic.100000000, i mean when does zk create new version
> file, i have change a property in static file and restarted zk but it didnt
> create new version file so it will only create new version when a config in
> dynamic file changes?
> 3. How many copies/versions of these dynamic config files will get created
> and is there a purge task that zk runs to cleanup older version files?
>
>
>
> Thanks,
> Ram
>