[infinispan-issues] [JBoss JIRA] (ISPN-7019) Need better docs for memory-based eviction

[John Sanda (JIRA)]

John Sanda created ISPN-7019:
--------------------------------

             Summary: Need better docs for memory-based eviction
                 Key: ISPN-7019
                 URL: https://issues.jboss.org/browse/ISPN-7019
             Project: Infinispan
          Issue Type: Task
            Reporter: John Sanda
            Priority: Minor


In order to use memory based eviction, cache entries have to be stored as binary, e.g., 

{noformat}
<infinispan>
  <cache-container default-cache="default">
    <transport cluster="HawkularMetrics"/>
    <distributed-cache name="rawData" mode="ASYNC" >
      <groups enabled="true"/>
      <store-as-binary/>
      <eviction size="2576980377" strategy="LRU" type="MEMORY"/>
      <persistence passivation="true">
        <leveldb-store path="/tmp/hawkular-metrics/jni/raw/data" shared="false" preload="false">
          <expiration path="/tmp/hawkular-metrics/jni/raw/expired"/>
          <compression type="NONE" />
          <implementation type="JAVA"/>
          <write-behind/>
        </leveldb-store>
      </persistence>
    </distributed-cache>
  </cache-container>
</infinispan>
{noformat}

Without the {{store-as-binary}}, you get exceptions like:

{noformat}
ava.lang.IllegalArgumentException: Size of Class class org.hawkular.metrics.core.service.cache.MetricKey cannot be determined using given entry size calculator :class org.infinispan.container.entries.MarshalledValueEntrySizeCalculator
        at org.infinispan.container.entries.PrimitiveEntrySizeCalculator.handleObject(PrimitiveEntrySizeCalculator.java:91) ~[infinispan-core-8.1.0.Final.jar:8.1.0.Final]
{noformat}

when trying to store cache entries. This configuration setting should be more clearly documented and/or have the exception mention it as well.



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