From 09451252fae90a3ec192b8d7f0c49508df65e8c5 Mon Sep 17 00:00:00 2001
From: Andrew Wang <wang@apache.org>
Date: Tue, 29 Nov 2016 00:12:35 -0800
Subject: [PATCH] HDFS-5517. Lower the default maximum number of blocks per
 file. Contributed by Aaron T. Myers.

---
 .../src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java     | 2 +-
 .../hadoop-hdfs/src/main/resources/hdfs-default.xml             | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
index d7d3c9dd6b..df218579aa 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java
@@ -399,7 +399,7 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
   public static final String  DFS_NAMENODE_MIN_BLOCK_SIZE_KEY = "dfs.namenode.fs-limits.min-block-size";
   public static final long    DFS_NAMENODE_MIN_BLOCK_SIZE_DEFAULT = 1024*1024;
   public static final String  DFS_NAMENODE_MAX_BLOCKS_PER_FILE_KEY = "dfs.namenode.fs-limits.max-blocks-per-file";
-  public static final long    DFS_NAMENODE_MAX_BLOCKS_PER_FILE_DEFAULT = 1024*1024;
+  public static final long    DFS_NAMENODE_MAX_BLOCKS_PER_FILE_DEFAULT = 10*1000;
   public static final String  DFS_NAMENODE_MAX_XATTRS_PER_INODE_KEY = "dfs.namenode.fs-limits.max-xattrs-per-inode";
   public static final int     DFS_NAMENODE_MAX_XATTRS_PER_INODE_DEFAULT = 32;
   public static final String  DFS_NAMENODE_MAX_XATTR_SIZE_KEY = "dfs.namenode.fs-limits.max-xattr-size";
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml b/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
index c9d74bb9cf..9fce84f710 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml
@@ -372,7 +372,7 @@
 
 <property>
     <name>dfs.namenode.fs-limits.max-blocks-per-file</name>
-    <value>1048576</value>
+    <value>10000</value>
     <description>Maximum number of blocks per file, enforced by the Namenode on
         write. This prevents the creation of extremely large files which can
         degrade performance.</description>