added retry command

src/main/java/de/uulm/omi/evaluation/task/RemoteCommand.java

@@ -169,9 +169,16 @@ public class RemoteCommand extends EvaluationTask {
       LOGGER.debug(recordCountCommand);
       channel2.setCommand(recordCountCommand);
 
-      channel2.connect();
-      String recordCountResult = CharStreams.toString(new InputStreamReader(output2));
-      channel2.disconnect();
+      int retryCounter = 3;
+      String recordCountResult = null;
+
+      while ( recordCountCommand == null || recordCountCommand.isEmpty() || retryCounter > 0){
+        channel2.connect();
+        recordCountResult = CharStreams.toString(new InputStreamReader(output2));
+        channel2.disconnect();
+        retryCounter--;
+        LOGGER.debug("Record count command returned empty result, retrying! Retry Counter is: " + retryCounter);
+      }
 
       LOGGER.debug(this.loggerPrefix +  "The remote recordCount command result is: " + recordCountResult);
 
@@ -237,9 +244,8 @@ public class RemoteCommand extends EvaluationTask {
     /**
      *  limited memory usage
      */
-    //String command = "sudo timeout 180 java -Xmx512m -jar cassandra-count -host " + host  + " -keyspace ycsb -table usertable  -splitSize " + splitSize +  " -numSplits " + numOfSplits;
+    String command = "sudo timeout 180 java -Xmx512m -jar cassandra-count -host " + host  + " -keyspace ycsb -table usertable  -splitSize " + splitSize +  " -numSplits " + numOfSplits;
 
-    String command = "echo 'test";
     return command;
   }