From 6f7b462f1dbd139955e10561e09522e0ffa13f3e Mon Sep 17 00:00:00 2001
From: kimchy <kimchy@gmail.com>
Date: Wed, 6 Jul 2011 18:57:11 +0300
Subject: [PATCH] java.lang.ArrayIndexOutOfBoundsException when indexing a doc,
 closes #1094.

---
 .../org/elasticsearch/index/engine/robin/RobinEngine.java  | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/modules/elasticsearch/src/main/java/org/elasticsearch/index/engine/robin/RobinEngine.java b/modules/elasticsearch/src/main/java/org/elasticsearch/index/engine/robin/RobinEngine.java
index 02361e9d45b..20a137421d2 100644
--- a/modules/elasticsearch/src/main/java/org/elasticsearch/index/engine/robin/RobinEngine.java
+++ b/modules/elasticsearch/src/main/java/org/elasticsearch/index/engine/robin/RobinEngine.java
@@ -1182,7 +1182,12 @@ public class RobinEngine extends AbstractIndexShardComponent implements Engine {
     }
 
     private Object dirtyLock(String id) {
-        return dirtyLocks[Math.abs(id.hashCode()) % dirtyLocks.length];
+        int hash = id.hashCode();
+        // abs returns Integer.MIN_VALUE, so we need to protect against it...
+        if (hash == Integer.MIN_VALUE) {
+            hash = 0;
+        }
+        return dirtyLocks[Math.abs(hash) % dirtyLocks.length];
     }
 
     private Object dirtyLock(Term uid) {