[jira] [Comment Edited] (IGNITE-5024) Default MemoryPolicy settings improvements

["Sergey Chugunov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-5024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15976477#comment-15976477 ] 

Sergey Chugunov edited comment on IGNITE-5024 at 4/20/17 1:33 PM:
------------------------------------------------------------------

[~dsetrakyan], sure, examples are below. I'll use this proposed setting in them and at the end show how configuration looks like without it.

I would consider Memory Policy configuration on three different levels.

*Fully default*: user doesn't need to specify anything, default MemoryPolicy with default name and 80% of available RAM size is created.

*Semi-default*: user wants to override this "80% RAM" setting. All is needed is to use the following configuration:
{code:xml}
     <property name="memoryConfiguration">
         <bean class="org.apache.ignite.configuration.MemoryConfiguration">
             <property name="defaultMemoryPolicySize" value="#{2 * 1024 * 1024 * 1024}"/>
         </bean>
     </property>
{code}

*Fully customized*: user defines everything by his/her own including name and size of default Memory Policy.
{code:xml}
     <property name="memoryConfiguration">
         <bean class="org.apache.ignite.configuration.MemoryConfiguration">
             <property name="defaultMemoryPolicyName" value="default_mem_plc"/>

             <property name="memoryPolicies">
                 <list>
                     <bean class="org.apache.ignite.configuration.MemoryPolicyConfiguration">
                         <property name="name" value="default_mem_plc"/>
                         <property name="size" value="#{16 * 1024 * 1024 * 1024}"/>
                     </bean>
                 </list>
             </property>
         </bean>
     </property>
{code}


Proposed setting allows to simplify semi-default level; without it user needs to use verbose fully-customized syntax in order to adjust only default Memory Policy size.


was (Author: sergey-chugunov):
[~dsetrakyan], sure, examples are as follows. I'll use this proposed setting in them and at the end show how configuration looks like without it.

I would consider Memory Policy configuration on three different levels.

*Fully default*: user doesn't need to specify anything, default MemoryPolicy with default name and 80% of available RAM size is created.

*Semi-default*: user wants to override this "80% RAM" setting. All is needed is to use the following configuration:
{code:xml}
     <property name="memoryConfiguration">
         <bean class="org.apache.ignite.configuration.MemoryConfiguration">
             <property name="defaultMemoryPolicySize" value="#{2 * 1024 * 1024 * 1024}"/>
         </bean>
     </property>
{code}

*Fully customized*: user defines everything by his/her own including name and size of default Memory Policy.
{code:xml}
     <property name="memoryConfiguration">
         <bean class="org.apache.ignite.configuration.MemoryConfiguration">
             <property name="defaultMemoryPolicyName" value="default_mem_plc"/>

             <property name="memoryPolicies">
                 <list>
                     <bean class="org.apache.ignite.configuration.MemoryPolicyConfiguration">
                         <property name="name" value="default_mem_plc"/>
                         <property name="size" value="#{16 * 1024 * 1024 * 1024}"/>
                     </bean>
                 </list>
             </property>
         </bean>
     </property>
{code}


Proposed setting allows to simplify semi-default level; without it user needs to use verbose fully-customized syntax in order to adjust only default Memory Policy size.

> Default MemoryPolicy settings improvements
> ------------------------------------------
>
>                 Key: IGNITE-5024
>                 URL: https://issues.apache.org/jira/browse/IGNITE-5024
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Sergey Chugunov
>            Assignee: Sergey Chugunov
>              Labels: general
>             Fix For: 2.0
>
>
> h2. Notes
> Currently when user doesn't specify any MemoryPolicy configuration a default one is created. It has a fixed size of 1 GB which seems to be too rigid.
> Also when user wants to override size of the default MemoryPolicy, the full syntax of this configuration must be used; it is cumbersome in such simple case.
> h2. Acceptance Criteria
> # Default MemoryPolicy is created with size of 80% of physical memory available on machine.
> # New configuration property *defaultMemoryPolicySize* is introduced in *memoryConfiguration* section to allow user to specify exact size in bytes without applying verbose syntax of *memoryPolicyConfiguration* section.



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