Viewing the complete configuration of a running Zookeeper server

[Bryan Pendleton <bp...@gmail.com>]

I'm trying to build some tools that examine a running Zookeeper ensemble,
and one of the things I want to do in my tool is to view the complete
configuration of that server. The reason I want to do this is because we
had an operational mishap in which zoo.cfg was modified but the server was
not restarted, and hence it was not running with the configuration that we
thought it was using.

I tried 'echo conf | nc my-host 2181', and it does print configuration
data, but it seems to only print a very small subset of the various
configuration data that can be set. The 'mntr' and 'stat' commands also
print some configuration data, but still only a very small subset.

Is there a 4-letter-word command (or other live monitoring technique) that
I can use to display the *complete* configuration of a running Zookeeper
server, so I can exhaustively check the values of all the configuration
variables that it's currently using?

thanks,

bryan

Re: Viewing the complete configuration of a running Zookeeper server

[David Brower <da...@oracle.com>]

Hey, Bryan, what are you up to nowadays?

-dB
---
From a phone; typing trying, thus terse.

> On Nov 25, 2019, at 2:36 PM, Bryan Pendleton <bp...@gmail.com> wrote:
> 
> I'm trying to build some tools that examine a running Zookeeper ensemble,
> and one of the things I want to do in my tool is to view the complete
> configuration of that server. The reason I want to do this is because we
> had an operational mishap in which zoo.cfg was modified but the server was
> not restarted, and hence it was not running with the configuration that we
> thought it was using.
> 
> I tried 'echo conf | nc my-host 2181', and it does print configuration
> data, but it seems to only print a very small subset of the various
> configuration data that can be set. The 'mntr' and 'stat' commands also
> print some configuration data, but still only a very small subset.
> 
> Is there a 4-letter-word command (or other live monitoring technique) that
> I can use to display the *complete* configuration of a running Zookeeper
> server, so I can exhaustively check the values of all the configuration
> variables that it's currently using?
> 
> thanks,
> 
> bryan

Re: Viewing the complete configuration of a running Zookeeper server

[Bryan Pendleton <bp...@gmail.com>]

The specific variable that I was trying to query was cnxTimeout, but I
noticed that many configuration variables that are documented in the admin
guide are not in the 'conf' output (I didn't compile a complete list).

We are using 3.4, but we have plans to move to 3.5 fairly soon.

Thank you for pointing me at the HTTP Admin endpoint, I will go investigate
that.

bryan


On Mon, Nov 25, 2019 at 10:31 PM Enrico Olivelli <eo...@gmail.com>
wrote:

> Brian,
>
> Il lun 25 nov 2019, 23:36 Bryan Pendleton <bp...@gmail.com>
> ha scritto:
>
> > I'm trying to build some tools that examine a running Zookeeper ensemble,
> > and one of the things I want to do in my tool is to view the complete
> > configuration of that server. The reason I want to do this is because we
> > had an operational mishap in which zoo.cfg was modified but the server
> was
> > not restarted, and hence it was not running with the configuration that
> we
> > thought it was using.
> >
> > I tried 'echo conf | nc my-host 2181', and it does print configuration
> > data, but it seems to only print a very small subset of the various
> > configuration data that can be set. The 'mntr' and 'stat' commands also
> > print some configuration data, but still only a very small subset.
> >
> > Is there a 4-letter-word command (or other live monitoring technique)
> that
> > I can use to display the *complete* configuration of a running Zookeeper
> > server, so I can exhaustively check the values of all the configuration
> > variables that it's currently using?
> >
>
> Which variable are you missing?
> What version of Zookeeper are you running?
>
> Since 3.5 (current stable and suggested version) we have the HTTP admin
> endpoint and it also is able to report more information about the status of
> the server. In the upcoming release 3.6 we also added more information.
>
> Maybe you can check the http endpoint or your running server and if it is
> missing something we can check on 3.6 (not yet released but available on
> github) whether the info you are looking for is present
>
>
> Enrico
>
>
>
> thanks,
> >
> > bryan
> >
>

Re: Viewing the complete configuration of a running Zookeeper server

[Enrico Olivelli <eo...@gmail.com>]

Brian,

Il lun 25 nov 2019, 23:36 Bryan Pendleton <bp...@gmail.com>
ha scritto:

> I'm trying to build some tools that examine a running Zookeeper ensemble,
> and one of the things I want to do in my tool is to view the complete
> configuration of that server. The reason I want to do this is because we
> had an operational mishap in which zoo.cfg was modified but the server was
> not restarted, and hence it was not running with the configuration that we
> thought it was using.
>
> I tried 'echo conf | nc my-host 2181', and it does print configuration
> data, but it seems to only print a very small subset of the various
> configuration data that can be set. The 'mntr' and 'stat' commands also
> print some configuration data, but still only a very small subset.
>
> Is there a 4-letter-word command (or other live monitoring technique) that
> I can use to display the *complete* configuration of a running Zookeeper
> server, so I can exhaustively check the values of all the configuration
> variables that it's currently using?
>

Which variable are you missing?
What version of Zookeeper are you running?

Since 3.5 (current stable and suggested version) we have the HTTP admin
endpoint and it also is able to report more information about the status of
the server. In the upcoming release 3.6 we also added more information.

Maybe you can check the http endpoint or your running server and if it is
missing something we can check on 3.6 (not yet released but available on
github) whether the info you are looking for is present


Enrico



thanks,
>
> bryan
>