title: WSO2 DAS - Error in index data peekNext: Map failed
body: <p>My scenario,</p>
  
  <p>I have some transaction details in Mysql DB. I use WSO2 ESB server and push these data into WSO2 DAS server(persisted the data in H2 DB with primary key and index). The data are loaded to the DAS server successfully but the problem I face is, I see an ERROR in my DAS console continuously after every three seconds. The error is given below.</p>
  
  <pre><code>    [2016-04-21 09:09:48,175] ERROR {org.wso2.carbon.analytics.dataservice.core.indexing.AnalyticsDataIndexer} -  Error in p
  rocessing index batch operations: Error in index data peekNext: Map failed
  org.wso2.carbon.analytics.datasource.commons.exception.AnalyticsException: Error in index data peekNext: Map failed
          at org.wso2.carbon.analytics.dataservice.core.indexing.LocalIndexDataStore$LocalIndexDataQueue.peekNext(LocalInd
  exDataStore.java:287)
          at org.wso2.carbon.analytics.dataservice.core.indexing.AnalyticsDataIndexer.processLocalShardDataQueue(Analytics
  DataIndexer.java:297)
          at org.wso2.carbon.analytics.dataservice.core.indexing.AnalyticsDataIndexer.processIndexOperations(AnalyticsData
  Indexer.java:261)
          at org.wso2.carbon.analytics.dataservice.core.indexing.AnalyticsDataIndexer.access$200(AnalyticsDataIndexer.java
  :141)
          at org.wso2.carbon.analytics.dataservice.core.indexing.AnalyticsDataIndexer$IndexWorker.run(AnalyticsDataIndexer
  .java:1865)
          at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
          at java.lang.Thread.run(Thread.java:745)
  Caused by: java.io.IOException: Map failed
          at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:888)
          at com.leansoft.bigqueue.page.MappedPageFactoryImpl.acquirePage(MappedPageFactoryImpl.java:86)
          at com.leansoft.bigqueue.BigArrayImpl.append(BigArrayImpl.java:325)
          at com.leansoft.bigqueue.BigQueueImpl.enqueue(BigQueueImpl.java:92)
          at org.wso2.carbon.analytics.dataservice.core.indexing.LocalIndexDataStore$LocalIndexDataQueue.peekNext(LocalInd
  exDataStore.java:271)
          ... 7 more
  Caused by: java.lang.OutOfMemoryError: Map failed
          at sun.nio.ch.FileChannelImpl.map0(Native Method)
          at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:885)
          ... 11 more
  </code></pre>
  
  <p>I am not sure why this is happening. Please help and thanks in advance.</p>