better failure when trying to obtain a native lock on the node data location, and reduce the tries from 100 to 50.

Author: kimchy

modules/elasticsearch/src/main/java/org/elasticsearch/env/NodeEnvironment.java

@@ -56,7 +56,8 @@ public class NodeEnvironment extends AbstractComponent {
  Lock lock = null;
  File dir = null;
  int localNodeId = -1;
- for (int i = 0; i < 100; i++) {
+ IOException lastException = null;
+ for (int i = 0; i < 50; i++) {
  dir = new File(new File(environment.dataWithClusterFile(), "nodes"), Integer.toString(i));
  if (!dir.exists()) {
  dir.mkdirs();
@@ -71,11 +72,11 @@ public class NodeEnvironment extends AbstractComponent {
  break;
  }
  } catch (IOException e) {
- // ignore
+ lastException = e;
  }
  }
  if (lock == null) {
- throw new IOException("Failed to obtain node lock");
+ throw new IOException("Failed to obtain node lock", lastException);
  }
  this.localNodeId = localNodeId;
  this.lock = lock;