On 09/25/2015 08:13 AM, Marco Massenzio wrote:
Folks:
as a reminder, please be aware that as of Mesos 0.24.0, as announced
back in June, Mesos Master will write its information (`MasterInfo`) to
ZooKeeper in JSON format (see below for details).
What versions of Zookeeper are supported by this change? That is, what
is the oldest version of Zookeeper known to work or not work with this
change in Mesos?
James
If your framework relied on parsing the info (either de-serializing the
Protocol Buffer or just looking for an "IP-like" string) this change
will be a breaking change.
Just to confirm (see also Vinod's comments below) any rolling upgrades
(i.e., clusters with 0.22+0.23 and 0.23+0.24) of Mesos will just work.
This was in conjunction with the HTTP API release and removing the need
for non-C++ developers to have to link with libmesos and have to deal
with Protocol Buffers.
An example of how to access the new format in Python can be found in [0]
and we're happy to help with other languages too.
Any questions, please just ask.
[0] http://github.com/massenz/zk-mesos
Marco Massenzio
/Distributed Systems Engineer
http://codetrips.com/
---------- Forwarded message ----------
From: *Vinod Kone* <[email protected] <mailto:[email protected]>>
Date: Wed, Jun 24, 2015 at 4:17 PM
Subject: Re: [Breaking Change 0.24 & Upgrade path] ZooKeeper MasterInfo
change.
To: dev <[email protected] <mailto:[email protected]>>
Just to clarify, any frameworks that are using the Mesos provided bindings
(aka libmesos.so) should not worry, as long as the version of the bindings
and version of the mesos master are not separated by more than 1 version.
In other words, you should be able to live upgrade a cluster from 0.23.0 to
0.24.0.
For framework schedulers that don't use the bindings (pesos, jesos etc), it
is prudent to add support for JSON formatted ZNODE to their master
detection code.
Thanks,
On Wed, Jun 24, 2015 at 4:10 PM, Marco Massenzio <[email protected]
<mailto:[email protected]>>
wrote:
Folks,
as heads-up, we are planning to convert the format of the MasterInfo
information stored in ZooKeeper from the Protocol Buffer binary format to
JSON - this is in conjunction with the HTTP API development, to allow
frameworks *not* to depend on libmesos and other binary dependencies to
interact with Mesos Master nodes.
> *NOTE* - there is no change in 0.23 (so any Master/Slave/Framework
that is
> currently working in 0.22 *will continue to work* in 0.23 too) but as of
Mesos 0.24, frameworks and other clients relying on the binary format will
break.
The details of the design are in this Google Doc:
https://docs.google.com/document/d/1i2pWJaIjnFYhuR-000NG-AC1rFKKrRh3Wn47Y2G6lRE/edit
the actual work is detailed in MESOS-2340:
https://issues.apache.org/jira/browse/MESOS-2340
and the patch (and associated test) are here:
https://reviews.apache.org/r/35571/
https://reviews.apache.org/r/35815/
> *Marco Massenzio*
> *Distributed Systems Engineer*
>
