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From Chad Harrington <chad.harring...@gmail.com>
Subject Re: Embedding ZK in another application
Date Thu, 29 Apr 2010 18:22:52 GMT
On Thu, Apr 29, 2010 at 8:49 AM, Patrick Hunt <phunt@apache.org> wrote:

> This is not foolproof however. We found that in general this would work,
> however there were some infrequent cases where a restarted server would fail
> to initialize due to the following issue:
> "it is possible for the process to complete before the kernel has released
> the associated network resource, and this port cannot be bound to another
> process until the kernel has decided that it is done."
> more detail here:
> http://hea-www.harvard.edu/~fine/Tech/addrinuse.html
> as a result we ended up changing the test code to start each test with new
> quorum/election port numbers. This fixed the problem for us but would not be
> a solution in your case.
> Patrick

I am not an expert at all on this, but I have used SO_REUSEADDR in other
situations to avoid the address in use problem.  Would that help here?

Chad Harrington

> On 04/29/2010 07:13 AM, Vishal K wrote:
>> Hi Ted,
>> We want the application that embeds the ZK server to be running even after
>> the ZK server is shutdown. So we don't want to restart the application.
>> Also, we prefer not to use zkServer.sh/zkServer.cmd because these are OS
>> dependent (our application will run on Win as well as Linux). Instead, we
>> thought that calling QuorumPeerMain.initializeAndRun() and
>> QuorumPeerMain.shutdown() will suffice to start and shutdown a ZK server
>> and
>> we won't have to worry about checking the OS.
>> Is there way to cleanly shutdown the ZK server (by invoking ZK server API)
>> when it is embedded in the application without actually restarting the
>> application process?
>> Thanks.
>> On Thu, Apr 29, 2010 at 1:54 AM, Ted Dunning<ted.dunning@gmail.com>
>>  wrote:
>>  Hmmm.... it isn't quite clear what you mean by restart without
>>> restarting.
>>> Why is killing the server and restarting it not an option?
>>> It is common to do a rolling restart on a ZK cluster.  Just restart one
>>> server at a time.  This is often used during system upgrades.
>>> On Wed, Apr 28, 2010 at 8:22 PM, Vishal K<vishalmlst@gmail.com>  wrote:
>>>> What is a good way to restart a ZK server (standalone and quorum)
>>>> without
>>>> having to restart it?
>>>> Currently, I have ZK server embedded in another java application.

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