From e2653a8cf4a1d727c5a0e0406092002e68634052 Mon Sep 17 00:00:00 2001
From: jaehong choi <hong83@gmail.com>
Date: Fri, 27 May 2016 01:55:33 +0900
Subject: [PATCH] handle a NPE in LookupCoordinatorManager.start() (#3026)

---
 .../druid/server/lookup/cache/LookupCoordinatorManager.java   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/server/src/main/java/io/druid/server/lookup/cache/LookupCoordinatorManager.java b/server/src/main/java/io/druid/server/lookup/cache/LookupCoordinatorManager.java
index 1258975f35c..f9aaee2f64f 100644
--- a/server/src/main/java/io/druid/server/lookup/cache/LookupCoordinatorManager.java
+++ b/server/src/main/java/io/druid/server/lookup/cache/LookupCoordinatorManager.java
@@ -551,6 +551,10 @@ public class LookupCoordinatorManager
                 LOG.info("Not started. Returning");
                 return;
               }
+              if (allLookupTiers == null) {
+                LOG.info("Not updating lookups because no data exists");
+                return;
+              }
               for (final String tier : allLookupTiers.keySet()) {
                 try {
                   final Map<String, Map<String, Object>> allLookups = allLookupTiers.get(tier);