From 7df5169ef4e2ff2455d07359332f5503667c5a4c Mon Sep 17 00:00:00 2001
From: Yonik Seeley <yonik@apache.org>
Date: Wed, 25 Sep 2013 17:52:54 +0000
Subject: [PATCH] SOLR-4221: make new solrj client/router able to read old
 clusterstate

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1526244 13f79535-47bb-0310-9956-ffa450edef68
---
 .../src/java/org/apache/solr/common/cloud/DocRouter.java   | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/solr/solrj/src/java/org/apache/solr/common/cloud/DocRouter.java b/solr/solrj/src/java/org/apache/solr/common/cloud/DocRouter.java
index e7212eff813..fd44859ab8e 100644
--- a/solr/solrj/src/java/org/apache/solr/common/cloud/DocRouter.java
+++ b/solr/solrj/src/java/org/apache/solr/common/cloud/DocRouter.java
@@ -51,7 +51,12 @@ public abstract class DocRouter {
 
   protected String getRouteField(DocCollection coll){
     if(coll == null) return null;
-    Map m = (Map) coll.get(DOC_ROUTER);
+    Object o = coll.get(DOC_ROUTER);
+    if (o instanceof String) {
+      return null;
+      //old format. cannot have a routefield. Ignore it
+    }
+    Map m = (Map) o;
     if(m == null) return null;
     return (String) m.get("field");