On Wed, Aug 7, 2013 at 12:10 PM, Afkham Azeez <az...@wso2.com> wrote:

>
>
>
> On Wed, Aug 7, 2013 at 12:00 PM, Dhanuka Ranasinghe <dhan...@wso2.com>wrote:
>
>>
>>
>>  *Dhanuka Ranasinghe*
>>
>> Senior Software Engineer
>> WSO2 Inc. ; http://wso2.com
>> lean . enterprise . middleware
>>
>> phone : +94 715381915
>>
>>
>> On Wed, Aug 7, 2013 at 11:31 AM, Afkham Azeez <az...@wso2.com> wrote:
>>
>>> While running certain scenarios during testing of the Carbon 4.2.0
>>> packs, we saw certain performance issues when distributed Hazelcast
>>> HashMaps are used as the backing data structure. To overcome this, I have
>>> introduced the concept of an L1 local cache. It is a write through cache,
>>> where items stored in it will also get written to the distributed data
>>> structure. When there is a L1 cache miss, we will check in the L2
>>> distributed cache to see whether the value is there.
>>>
>>
>> Is this L1 concept similar to first level caching in Hibernate? which
>> means first level caching stores in memory, and flush them to second level
>> caching (file system) later.
>>
>
> No it is not exactly the same. The flushing here is done immediately. I
> didn't want to complicate it until it becomes necessary.
>

So at the moment, cache write could be a bit slow, but reads are very fast.
Reads are more frequent than writes

>
>
>>
>>> I am seeing significant performance improvement in the tenant creation
>>> scenario after this improvement.
>>>
>>> --
>>> *Afkham Azeez*
>>> Director of Architecture; WSO2, Inc.; http://wso2.com
>>> Member; Apache Software Foundation; http://www.apache.org/
>>> * <http://www.apache.org/>**
>>> email: **az...@wso2.com* <az...@wso2.com>* cell: +94 77 3320919
>>> blog: **http://blog.afkham.org* <http://blog.afkham.org>*
>>> twitter: **http://twitter.com/afkham_azeez*<http://twitter.com/afkham_azeez>
>>> *
>>> linked-in: **http://lk.linkedin.com/in/afkhamazeez*
>>> *
>>> *
>>> *Lean . Enterprise . Middleware*
>>>
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>>>
>>>
>>
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>>
>
>
> --
> *Afkham Azeez*
> Director of Architecture; WSO2, Inc.; http://wso2.com
> Member; Apache Software Foundation; http://www.apache.org/
> * <http://www.apache.org/>**
> email: **az...@wso2.com* <az...@wso2.com>* cell: +94 77 3320919
> blog: **http://blog.afkham.org* <http://blog.afkham.org>*
> twitter: **http://twitter.com/afkham_azeez*<http://twitter.com/afkham_azeez>
> *
> linked-in: **http://lk.linkedin.com/in/afkhamazeez*
> *
> *
> *Lean . Enterprise . Middleware*
>



-- 
*Afkham Azeez*
Director of Architecture; WSO2, Inc.; http://wso2.com
Member; Apache Software Foundation; http://www.apache.org/
* <http://www.apache.org/>**
email: **az...@wso2.com* <az...@wso2.com>* cell: +94 77 3320919
blog: **http://blog.afkham.org* <http://blog.afkham.org>*
twitter: **http://twitter.com/afkham_azeez*<http://twitter.com/afkham_azeez>
*
linked-in: **http://lk.linkedin.com/in/afkhamazeez*
*
*
*Lean . Enterprise . Middleware*
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