title: Apache Ignite : Out of memory in data region [name=Default_Region, initSize=256.0 MiB, maxSize=68.0 GiB, persistenceEnabled=false]
body: <p>We got Out of memory in data region in our Apache Ignite production environment, and Ignite process got killed.
  We have configured off heap memory of 68 GB. And no eviction policies are enabled as we don't want to loose any data from Ignite. Also we didn't enable persistence as we want to store whole data in Ignite only.</p>
  
  <pre><code>class org.apache.ignite.internal.mem.IgniteOutOfMemoryException: Out of memory in data region [name=Default_Region, initSize=256.0 MiB, maxSize=68.0 GiB, persistenceEnabled=false] Try the following:
    ^-- Increase maximum off-heap memory size (DataRegionConfiguration.maxSize)
    ^-- Enable Ignite persistence (DataRegionConfiguration.persistenceEnabled)
    ^-- Enable eviction or expiration policies
      at org.apache.ignite.internal.pagemem.impl.PageMemoryNoStoreImpl.allocatePage(PageMemoryNoStoreImpl.java:304)
      at org.apache.ignite.internal.processors.cache.persistence.freelist.AbstractFreeList.allocateDataPage(AbstractFreeList.java:463)
      at org.apache.ignite.internal.processors.cache.persistence.freelist.AbstractFreeList.insertDataRow(AbstractFreeList.java:501)
      at org.apache.ignite.internal.processors.cache.persistence.RowStore.addRow(RowStore.java:97)
  </code></pre>
  
  <p>The cause of this error is occupying entire data-region (68 GB)? If yes can we handle this from stopping Ignite service?</p>