From 3e75a6025d499f18fc4ebecc2740641718154b20 Mon Sep 17 00:00:00 2001
From: Zhihong Yu <tedyu@apache.org>
Date: Thu, 3 May 2012 01:26:24 +0000
Subject: [PATCH] HBASE-5913 Speed up the full scan of META (Chunhui)

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1333283 13f79535-47bb-0310-9956-ffa450edef68
---
 .../java/org/apache/hadoop/hbase/catalog/MetaReader.java     | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/main/java/org/apache/hadoop/hbase/catalog/MetaReader.java b/src/main/java/org/apache/hadoop/hbase/catalog/MetaReader.java
index 238740a2688..c3c7de8c2ee 100644
--- a/src/main/java/org/apache/hadoop/hbase/catalog/MetaReader.java
+++ b/src/main/java/org/apache/hadoop/hbase/catalog/MetaReader.java
@@ -609,6 +609,11 @@ public class MetaReader {
   throws IOException {
     Scan scan = new Scan();
     if (startrow != null) scan.setStartRow(startrow);
+    if (startrow == null && !scanRoot) {
+      int caching = catalogTracker.getConnection().getConfiguration()
+          .getInt(HConstants.HBASE_META_SCANNER_CACHING, 100);
+      scan.setCaching(caching);
+    }
     scan.addFamily(HConstants.CATALOG_FAMILY);
     HTable metaTable = scanRoot?
       getRootHTable(catalogTracker): getMetaHTable(catalogTracker);