Re: PeerClassLoading example using cacheLoaders

[Razmik Mkrtchyan]

Thank you, very much.

On Aug 14, 2017 22:22, "afedotov"  wrote:

> Hi,
>
> You are right, *load* method is called when there is a miss in a cache.
> putIfAbsent is supported by IgniteCache out of the box. I'm afraid that
> there is no simple way to achieve what
> a CacheStore offers. With any other approach, you would have to sacrifice
> read/write-through behavior.
>
>
> Kind regards,
> Alex.
>
> On Sat, Aug 12, 2017 at 8:39 AM, daniels [via Apache Ignite Users] <[hidden
> email] <http:///user/SendEmail.jtp?type=node&node=16177&i=0>> wrote:
>
>> Thank you,very much.
>>
>> And one more question, The  load method  of cacheLoader is called when I
>> do get from cache with the key which does not exists. Isn't it?
>>
>>  Isnt it solution without passing chacheLoader   -I do get and if the key
>> is  absent ,do put that key in the cache,in other words do  putIfAbsent but
>>  in my code ?
>>
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>> ing-example-using-cacheLoaders-tp16136p16149.html
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Re: PeerClassLoading example using cacheLoaders

[afedotov]

Hi,

You are right, *load* method is called when there is a miss in a cache.
putIfAbsent is supported by IgniteCache out of the box. I'm afraid that
there is no simple way to achieve what
a CacheStore offers. With any other approach, you would have to sacrifice
read/write-through behavior.


Kind regards,
Alex.

On Sat, Aug 12, 2017 at 8:39 AM, daniels [via Apache Ignite Users] <
ml+s70518n16149...@n6.nabble.com> wrote:

> Thank you,very much.
>
> And one more question, The  load method  of cacheLoader is called when I
> do get from cache with the key which does not exists. Isn't it?
>
>  Isnt it solution without passing chacheLoader   -I do get and if the key
> is  absent ,do put that key in the cache,in other words do  putIfAbsent but
>  in my code ?
>
> --
> If you reply to this email, your message will be added to the discussion
> below:
> http://apache-ignite-users.70518.x6.nabble.com/PeerClassLoading-example-
> using-cacheLoaders-tp16136p16149.html
> To start a new topic under Apache Ignite Users, email
> ml+s70518n1...@n6.nabble.com
> To unsubscribe from Apache Ignite Users, click here
> 
> .
> NAML
> 
>




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Re: PeerClassLoading example using cacheLoaders

[daniels]

Thank you,very much.

And one more question, The  load method  of cacheLoader is called when I do
get from cache with the key which does not exists. Isn't it?
 
 Isnt it solution without passing chacheLoader   -I do get and if the key is 
absent ,do put that key in the cache,in other words do  putIfAbsent but  in
my code ?



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Re: PeerClassLoading example using cacheLoaders

[vkulichenko]

If you have a custom implementation of CacheLoader, you need to deploy this
implementation on all nodes. I'm afraid, there is no workaround.

Note that Ignite provides CacheStore implementations for RDBMS [1] and
Cassandra [2] out of the box, so there is a chance that you don't need
custom one in the first place.

[1] https://apacheignite.readme.io/docs/3rd-party-store#cachejdbcpojostore
[2]
https://apacheignite.readme.io/docs/3rd-party-store#cassandra-cache-store

-Val



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Re: PeerClassLoading example using cacheLoaders

[daniels]

Hi
I know it. I  dont want   to copy that classes to all nodes.Therefore I dont
want to use chackeLoaderFactories. I am searching other solution. Now I want
to remove loaders. How to organize my cache creation without loaders,but
keep the  logic in loaders,where to put that logic

Thank you






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Re: PeerClassLoading example using cacheLoaders

[afedotov]

Hi,

Peer class loading works only for compute closures and tasks as described
here .
it's not applicable for configuration classes or cache entries, so you have
to copy that classes to all nodes.


Kind regards,
Alex.

On Fri, Aug 11, 2017 at 3:49 PM, daniels [via Apache Ignite Users] <
ml+s70518n16136...@n6.nabble.com> wrote:

>  I use the caching of ignite with cacheLoaderFactories. And I met the
> perrClassLoading problem.
> I  want not   to copy that classes to all nodes.
>  Now i want not to use cacheLoaderFactories.What methods will you offer to
> replace them so that there doesn't come the problem of peerclasLoading?
>
> My cache creation looks like this
>
> ignite.getOrCreateCache((CacheConfiguration) new
> CacheConfiguration<>(
> cacheConfiguration).setName(cacheName)
> .setCacheLoaderFactory(factory)
> .setReadThrough(true)
> .setExpiryPolicyFactory(EternalExpiryPolicy.factoryOf()))
>
>
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> using-cacheLoaders-tp16136.html
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> .
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>




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