From 4c579d6c8df7d3b8d5c2b28119cc6f74d34aa506 Mon Sep 17 00:00:00 2001
From: Shay Banon <kimchy@gmail.com>
Date: Mon, 16 Jun 2014 00:51:42 +0200
Subject: [PATCH] Better default size for global index -> alias map The alias
 -> (index -> alias) map, specifically the index -> alias one, typically just
 hold one entry, yet we eagerly initialize it to the number of indices. When
 there are many indices, each with many aliases, this is a very large overhead
 per alias... closes #6504

---
 src/main/java/org/elasticsearch/cluster/metadata/MetaData.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/org/elasticsearch/cluster/metadata/MetaData.java b/src/main/java/org/elasticsearch/cluster/metadata/MetaData.java
index b1c89b101e2..5d214f53743 100644
--- a/src/main/java/org/elasticsearch/cluster/metadata/MetaData.java
+++ b/src/main/java/org/elasticsearch/cluster/metadata/MetaData.java
@@ -191,7 +191,7 @@ public class MetaData implements Iterable<IndexMetaData> {
                 AliasMetaData aliasMd = aliasCursor.value;
                 ImmutableOpenMap.Builder<String, AliasMetaData> indexAliasMap = (ImmutableOpenMap.Builder<String, AliasMetaData>) tmpAliases.get(aliasMd.alias());
                 if (indexAliasMap == null) {
-                    indexAliasMap = ImmutableOpenMap.builder(indices.size());
+                    indexAliasMap = ImmutableOpenMap.builder(1); // typically, there is 1 alias pointing to an index
                     tmpAliases.put(aliasMd.alias(), indexAliasMap);
                 }
                 indexAliasMap.put(index, aliasMd);