Programmatic way to create new map without new instance

[Phinidy]

Is there a programmatic way to create anew map without creating a new
hazelcast instance ..?

Hazelcast hz = ... etc

hz.setMap("mapname1");
Map m = hz.getMap("mapname1")

?

[Fuad Malikov]

For a map to exist there should be at least one Hazelcast Instance. You can connect to Hazelcast cluster from Java client (which is not a member) and create a map.

HazelcastClient client = HazelcastClient.newHazelcastClient("dev", "dev-pass", "10.10.1.1:5701");

client.getMap("mapname1");

By the way HazelcastClient also implements HazelcastInstance interface. 

Fuad

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[Phinidy]

is there a way to add a map to an already running instance?

On Sep 16, 3:18 pm, Fuad Malikov <f...@hazelcast.com> wrote:
> For a map to exist there should be at least one Hazelcast Instance. You can
> connect to Hazelcast cluster from Java client (which is not a member) and
> create a map.
>
> HazelcastClient client = HazelcastClient.newHazelcastClient("dev",
> "dev-pass", "10.10.1.1:5701");
> client.getMap("mapname1");
>
> By the way HazelcastClient also implements HazelcastInstance interface.
>
> Fuad
>
>
>
>
>
>
>
> On Thu, Sep 16, 2010 at 11:11 PM, Phinidy <nijee.tay...@gmail.com> wrote:
> > Is there a programmatic way to create  anew map without creating a new
> > hazelcast instance ..?
>
> > Hazelcast hz = ... etc
>
> > hz.setMap("mapname1");
> > Map m = hz.getMap("mapname1")
>
> > ?
>
> > --
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> > To unsubscribe from this group, send email to>hazelcast+...@googlegroups.com<hazelcast%2Bunsubscribe@googlegroups .com>
> > .

[nijee taylor]

sorta like this 

Hazelcast.setMap("mapname1");    

Hazelcast.setMap("mapname2");   .. ??

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[Mehmet Dogan]

no need to any "set" like method or no need to specify a map in configuration.

hazelcastInstance.getMap("myMap") already creates that map lazily if that does not exist in cluster.

[Rafał Krupiński]

On Fri, Sep 17, 2010 at 08:50, Mehmet Dogan <mehmet...@gmail.com> wrote:
> no need to any "set" like method or no need to specify a map in configuration.
>
> hazelcastInstance.getMap("myMap") already creates that map lazily if that does not exist in cluster.

BTW if I modify Config object, i.e. programatically add configuration
for a map, and then create that map, will other nodes know that
configuration?

--
Pozdrawiam / Best Regards
Rafal Krupinski

[Mehmet Dogan]

unfortunately not yet.
also it is not possible to change config in runtime, configuration can be set only on startup for now,
can not be change later, and every node should (must) have exactly same configuration.

but it is on plan (in short period) to be able to edit configuration on the fly and to acknowledge all nodes with that change.

[nijee taylor]

how expensive is that method vs creating new HZ instance...?

[Mehmet Dogan]

hmm, configuration change on runtime is not fully implemented yet, but it is required to be a cheap or "nearly cheap" operation.
creating a new instance is very expensive operation, and note that hazelcast assumes all nodes are identical and configs of all members should be same.
otherwise there may be unexpected behaviors..

@mm

[Talip Ozturk]

The idea here is that you should have a set of preconfigured type of
maps. Notice the '*' in the names of the maps.

<map name="lru-*">...

<map name="five-min-ttl-*">...

<map name="mapstore-aware-*>...

then you can create as many map as you want on the fly...

Hazelcast.getMap("lru-Jobs");
Hazelcast.getMap("five-min-ttl-Sessions");
Hazelcast.getMap("mapstore-aware-Orders");

Problem with the dynamic configuration and creation of the map is the
fact that you have to make sure that all nodes are using the exact
same config for the created map. What if the map is created on another
node with a totally different config already. It is a total mess!

twitter @oztalip

[ser...@americasflorist.com]

does this apply to queues also ???

On Sep 17, 5:04 pm, Talip Ozturk <ta...@hazelcast.com> wrote:
> The idea here is that you should have a set of preconfigured type of
> maps. Notice the '*' in the names of the maps.
>
> <map name="lru-*">...
>
> <map name="five-min-ttl-*">...
>
> <map name="mapstore-aware-*>...
>
> then you can create as many map as you want on the fly...
>
> Hazelcast.getMap("lru-Jobs");
> Hazelcast.getMap("five-min-ttl-Sessions");
> Hazelcast.getMap("mapstore-aware-Orders");
>
> Problem with the dynamic configuration and creation of the map is the
> fact that you have to make sure that all nodes are using the exact
> same config for the created map. What if the map is created on another
> node with a totally different config already. It is a total mess!
>
> twitter @oztalip
>
>
>
>
>
>
>
> On Fri, Sep 17, 2010 at 9:10 PM, Mehmet Dogan <mehmetdog...@gmail.com> wrote:
> > hmm, configuration change on runtime is not fully implemented yet, but it is
> > required to be a cheap or "nearly cheap" operation.
> > creating a new instance is very expensive operation, and note that hazelcast
> > assumes all nodes are identical and configs of all members should be same.
> > otherwise there may be unexpected behaviors..
>
> > @mm
>

> > On Fri, Sep 17, 2010 at 20:15, nijee taylor <nijee.tay...@gmail.com> wrote:
>
> >> how expensive is that method vs creating new HZ instance...?
>

> >> On Fri, Sep 17, 2010 at 1:50 AM, Mehmet Dogan <mehmetdog...@gmail.com>

> >> wrote:
>
> >>> no need to any "set" like method or no need to specify a map in
> >>> configuration.
>
> >>> hazelcastInstance.getMap("myMap") already creates that map lazily if that
> >>> does not exist in cluster.
>
> >>> On Sep 16, 2010, at 11:41 PM, nijee taylor wrote:
>
> >>> > sorta like this
>
> >>> > Hazelcast.setMap("mapname1");
> >>> > Hazelcast.setMap("mapname2");   .. ??
>

> >>> > On Thu, Sep 16, 2010 at 3:21 PM, Phinidy <nijee.tay...@gmail.com>

> >>> > Groups "Hazelcast" group.>>> > To post to this group, send email tohaz...@googlegroups.com.
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[Talip Ozturk]

Yes. Same for queues.

twitter @oztalip

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