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From Mahadev Konar <maha...@yahoo-inc.com>
Subject Re: Embedding ZK in another application
Date Thu, 29 Apr 2010 18:31:48 GMT
We do set that Chad but it doesn't seem to help on some systems (especially
bsd)...

Thanks
mahadev


On 4/29/10 11:22 AM, "Chad Harrington" <chad.harrington@gmail.com> wrote:

> 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
> chad.harrington@gmail.com
> 
>> 
>> 
>> 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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