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From Sergey Kozlov <skoz...@gridgain.com>
Subject Re: Fifo eviction for atomic cache
Date Wed, 11 Nov 2015 11:59:58 GMT
It seems this behavior caused removeAll on empty cache executed before puts.

On Wed, Nov 11, 2015 at 1:16 PM, Sergey Kozlov <skozlov@gridgain.com> wrote:

> Hi
>
> I've tested some cache configurations with eviction policy and found a bit
> strange behavior.
>
> For instance the cache configuration is following and I want to have only
> 50 recent entries in cache (swap is disabled):
>
> <bean class="org.apache.ignite.configuration.CacheConfiguration">
>     <property name="name"
> value="cache_0001-ATOMIC-B2-PART-FIFO-OFF_VAL-OFFMAX_1024Lx1024L"/>
>     <property name="atomicityMode" value="ATOMIC"/>
>     <property name="backups" value="2"/>
>     <property name="cacheMode" value="PARTITIONED"/>
>     <property name="evictionPolicy">
>         <bean
> class="org.apache.ignite.cache.eviction.fifo.FifoEvictionPolicy">
>             <property name="maxSize" value="50"/>
>         </bean>
>     </property>
>     <property name="memoryMode" value="OFFHEAP_VALUES"/>
>     <property name="offHeapMaxMemory" value="#{1024L*1024L}"/>
> </bean>
>
> 1. I start 2 data nodes and a client node.
> 2. The client makes 60 puts (Int, String)
> 3. The client makes 60 gets for keys from the previous step and got only
> 40 entries. 20 first entries have been evicted.
>
>
> I repeated the scenario above for various cache configurations (changing
> options: writeSynchronizedMode, atomicityMode, rebalanceMode, cacheMode)
> and found that the issue occurs only for atomic caches with
> writeSynchronizedMode=ASYNC|PRIMARY_SYNC
> Eviction for TX caches and for ATOMIC with writeSynchronizedMode=FULL_SYNC
> works fine (always evicted 10 entries)
>
> Could someone take a look and explain such behavior?
>
> --
> Sergey Kozlov
>
>


-- 
Sergey Kozlov

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