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From "Basmajian, Raffi" <rbasmaj...@ofiglobal.com>
Subject RE: ActiveMQ deployment
Date Wed, 02 Dec 2015 02:00:08 GMT
Jim,

"Pure" master slave was deprecated, not "Shared storage" master slave. I can't comment on
LevelDB.

...deprecated:
http://activemq.apache.org/pure-master-slave.html

..what we use with ActiveMQ 5.11 and NFSv4 storage; it's solid and works well:
http://activemq.apache.org/shared-file-system-master-slave.html

For NFSv4, we use these settings which offer good balance between performance and recovery
time:
Client:   nfsvers=4,soft,timeo=100,retrans=1,noac,acregmax=5,acdirmax=5,lookupcache=none
Server:  rw,sync



-----Original Message-----
From: James A. Robinson [mailto:jimr@highwire.org] 
Sent: Tuesday, December 01, 2015 7:32 PM
To: users@activemq.apache.org
Subject: Re: ActiveMQ deployment [ EXTERNAL ]

So when I was building my system I had wanted to use M/S, but the documentation had indicated
the old M/S was deprecated in favor of the newer replicated LevelDB store.  There are some
stability issues with replicated LevelDB (w/ the code handling the zookeeper connection).
Do you use an older configuration to handle M/S?

Jim



On Tue, Dec 1, 2015 at 4:24 PM Basmajian, Raffi <rbasmajian@ofiglobal.com>
wrote:

> That's exactly the configuration we're building; M/S pairs with NoB, 
> connected via complete graph.
>
> All clients connect using wide-IP "failover:(tcp://eventbus:61616)",
> that's it. We did this for two reasons:
> 1) to avoid messy failover configuration on the client,
> 2) to avoid client-reconfig when topology is scaled out.
>
> Each broker has a special Http service that runs inside broker and 
> queries local JMX, responds with following JSON:
>
> {role:master}  or {role:slave}
>
> This makes it easy to implement heartbeat logic using hardware 
> load-balancer, like F5.
> F5 now pings each broker every 10s to determine which ones are active 
> and which are "master"; slaves and inactive nodes are removed from F5 pool.
> When client connects using "failover:(tcp://eventbus:61616)", DNS 
> routes to F5 first, then F5 connects client to master broker in 
> nearest datacenter; this is done for  initial connection only.
> If connection fails, assuming transport connector is configured to 
> update client with cluster changes, the client will reconnect on its 
> own; F5 does not handle that, which is exactly what we wanted. Control 
> initial connect to simplify client config, but leverage ActiveMQ 
> cluster aware clients library to manage connection failovers.
>
> Hope that helps,
>
> Raffi
>
>
> -----Original Message-----
> From: Rallavagu [mailto:rallavagu@gmail.com]
> Sent: Tuesday, December 01, 2015 2:57 PM
> To: users@activemq.apache.org
> Subject: Re: ActiveMQ deployment [ EXTERNAL ]
>
> Now, I am getting a clearer picture about the options. Essentially, 
> NOB provides load balancing while Master/Slave offers pure failover. 
> In case I go with combination where a Master/Slave cluster is 
> configured with NOB with other Master/Slave cluster how would the 
> client failover configuration would work?
>
> Will a set of consumers always connect a one of the Master/Slave cluster?
> In this case how would load balance work? Thanks.
>
> On 12/1/15 11:32 AM, Basmajian, Raffi wrote:
> > NoB forwards messages based on consumer demand, not for achieving
> failover.
> > You can get failover on the client using standalone brokers, just 
> > use
> failover:() protocol from client.
> > Master/Slave is true failover.
> >
> > -----Original Message-----
> > From: Rallavagu [mailto:rallavagu@gmail.com]
> > Sent: Tuesday, December 01, 2015 1:06 PM
> > To: users@activemq.apache.org
> > Subject: Re: ActiveMQ deployment [ EXTERNAL ]
> >
> > Thanks again Johan. As the failover is configured at the client end 
> > how
> would the configuration for combined deployment look like?
> >
> > I was thinking on the lines of NOB because the messages are 
> > forwarded to other broker(s) thus achieving failover capabilities in 
> > case the original broker is failed the duplicate messages are 
> > available on second
> > (other) broker(s). Am I off in my assumption?
> >
> > On 12/1/15 9:35 AM, Johan Edstrom wrote:
> >> You want to combine them, the NOB is for communication but JMS is 
> >> still
> store and forward, i.e if a machine dies, you can have multiple paths, 
> what was in the persistence store of said machine is still "dead" 
> until the machine is revived, that's where the Master / Slave(s) come 
> in. They'll jump in and start playing that persistence store.
> >>
> >> /je
> >>
> >>> On Nov 30, 2015, at 10:57 PM, Rallavagu <rallavagu@gmail.com> wrote:
> >>>
> >>> Thanks Johan.
> >>>
> >>> My goal is to achieve high availability (with failover) for 
> >>> producer
> and consumer in addition to mitigate a situation of "there is a chance 
> that one broker has producers but no consumers".
> >>>
> >>> As per the documentation, it sounds like NOB is an option which 
> >>> can
> offer failover and scalability. I was wondering if Master/Slave is the 
> only option to achieve high availability but it appears to me that NOB 
> can offer the same. Wanted to check this with folks here in this list 
> if there is anything I am missing.
> >>>
> >>>
> >>> On 11/30/15 9:28 PM, Johan Edstrom wrote:
> >>>> What you probably want is a combination of HA and communication.
> >>>>
> >>>> HA I.e master and slave(s) (Depending on storage) gives you uptime.
> >>>> NOB gives you communication paths and as such scalability and for
> some value of it versatility.
> >>>>
> >>>> You can also use the two above and combine that with bridges to 
> >>>> build
> small little scalable clouds that forward like say enterprise email systems.
> >>>>
> >>>> You can also go the completely different route and say that in 
> >>>> your
> Enterprise you only use central brokers for messages between systems 
> of importance, then you use local broker networks for message 
> patterns, aggregation etc.
> >>>>
> >>>>
> >>>> There is no one solution here. If you have more specific 
> >>>> questions it
> might be easier for people here to help as we might have more 
> associations possible?
> >>>>
> >>>> /je
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>> On Nov 30, 2015, at 3:25 PM, Rallavagu <rallavagu@gmail.com>
wrote:
> >>>>>
> >>>>> After spending some time reading, with reference to the 
> >>>>> following link,
> >>>>>
> >>>>> http://activemq.apache.org/clustering.html
> >>>>>
> >>>>> What I am trying to figure out is if it is possible to achieve a
> cluster with fault tolerance deploying with "Networks of brokers" or 
> should I consider "Master/Slave" in addition to "Networks of brokers". 
> Not sure how the hybrid deploying works. Any comments would help. Thanks.
> >>>>>
> >>>>> On 11/25/15 11:13 AM, Rallavagu wrote:
> >>>>>> Any takers on this? Thanks.
> >>>>>>
> >>>>>> On 11/24/15 1:37 PM, Rallavagu wrote:
> >>>>>>> All,
> >>>>>>>
> >>>>>>> What is the recommended deployment architecture for an enterprise?
> >>>>>>>
> >>>>>>> 1. Master/Slave with replicated Level DB
> >>>>>>> (http://activemq.apache.org/replicated-leveldb-store.html)
> >>>>>>>
> >>>>>>> 2. Network of Brokers for scalability
> >>>>>>>
> >>>>>>> 3. Hybrid
> >>>>>>>
> >>>>>>> In case of hybrid, is there a reference document that I
could use?
> >>>>>>> Thanks.
> >>>>
> >>
> >
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