[Hadoop Wiki] Update of "TroubleShooting" by GridEngine

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The "TroubleShooting" page has been changed by GridEngine:
http://wiki.apache.org/hadoop/TroubleShooting?action=diff&rev1=12&rev2=13

Comment:
general improvements

  
  === Error message: Could not get block locations. Aborting... ===
  
- There are number of possible of causes for this.
+ There are a number of possible of causes for this.
-  * The namenode may be overloaded. Check the logs for messages that say "discarding calls..."
+  * The NameNode may be overloaded. Check the logs for messages that say "discarding calls..."
-  * There may not be enough (any) datanodes for the data to be written. Again, check the logs.
+  * There may not be enough (any) DataNodes for the data to be written. Again, check the logs.
-  * The datanodes on which the blocks were stored might be down.
+  * The DataNodes on which the blocks were stored might be down.
  
  === Error message: Could not obtain block ===
  
@@ -62, +62 @@

   java.io.IOException: No live nodes contain current block 
  }}}
  
- There are no live datanodes containing a copy of the block of the file you are looking for. Bring up any nodes that are down, or skip that block.
+ There are no live DataNodes containing a copy of the block of the file you are looking for. Bring up any nodes that are down, or skip that block.
  
  == Reduce hangs ==