title: warn message using hazelcast 3.3 during mapstore loadAll
body: <p>I am using Hazelcast v3.3.  The Hazelcast server runs a few map store implementations.  I have sporadically seen the following warning in the logs and need to understand what might be causing this and whether it could lead to data loss in hazelcast.  I have a pretty small cluster at the moment for testing (4VMs running Ubuntu13 - 2GB RAM each).  </p>
  
  <pre><code>2014-09-14 18:55:21,886 WARN c.h.s.i.BasicInvocation [main] [xxx.xxx.xxx.xxx]:5701 [testApp] [3.3] While asking 'is-executing': BasicInvocationFuture{invocation=BasicInvocation{ serviceName='hz:
  impl:mapService', op=com.hazelcast.spi.impl.PartitionIteratingOperation@285583d4, partitionId=-1, replicaIndex=0, tryCount=10, tryPauseMillis=300, invokeCount=1, callTimeout=60000, target=Address[xxx.xxx.xxx.xxx]:5701}, done=false} java.util.concurrent.TimeoutException: Call BasicInvocation{ serviceName='hz:impl:mapService', op=com.hazelcast.spi.impl.IsStillExecutingOperation@5b202ff, partit
  ionId=-1, replicaIndex=0, tryCount=0, tryPauseMillis=0, invokeCount=1, callTimeout=5000, target=Address[xxx.xxx.xxx.xxx]:5701} encountered a timeout
          at com.hazelcast.spi.impl.BasicInvocationFuture.resolveApplicationResponse(BasicInvocationFuture.java:321)
          at com.hazelcast.spi.impl.BasicInvocationFuture.resolveApplicationResponseOrThrowException(BasicInvocationFuture.java:289)
          at com.hazelcast.spi.impl.BasicInvocationFuture.get(BasicInvocationFuture.java:181)
          at com.hazelcast.spi.impl.BasicInvocationFuture.isOperationExecuting(BasicInvocationFuture.java:390)
          at com.hazelcast.spi.impl.BasicInvocationFuture.waitForResponse(BasicInvocationFuture.java:228)
          at com.hazelcast.spi.impl.BasicInvocationFuture.get(BasicInvocationFuture.java:180)
          at com.hazelcast.spi.impl.BasicInvocationFuture.get(BasicInvocationFuture.java:160)
          at com.hazelcast.spi.impl.BasicOperationService$InvokeOnPartitions.awaitCompletion(BasicOperationService.java:489)
          at com.hazelcast.spi.impl.BasicOperationService$InvokeOnPartitions.invoke(BasicOperationService.java:458)
          at com.hazelcast.spi.impl.BasicOperationService$InvokeOnPartitions.access$600(BasicOperationService.java:430)
          at com.hazelcast.spi.impl.BasicOperationService.invokeOnAllPartitions(BasicOperationService.java:293)
          at com.hazelcast.map.proxy.MapProxySupport.size(MapProxySupport.java:616)
          at com.hazelcast.map.proxy.MapProxyImpl.size(MapProxyImpl.java:72)
          at com.akkadian.wildmetrix.StartHcastServer.main(StartHcastServer.java:105)
          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:483)
          at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)
  </code></pre>