HDFS-14675. Increase Balancer Defaults Further. Contributed by Stephen O'Donnell.

Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>
Reviewed-by: Gabor Bota <gabota@apache.org>

Author: Stephen O'Donnell

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSConfigKeys.java

@@ -110,11 +110,11 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
   public static final String  DFS_DATANODE_BALANCE_BANDWIDTHPERSEC_KEY =
       HdfsClientConfigKeys.DeprecatedKeys.DFS_DATANODE_BALANCE_BANDWIDTHPERSEC_KEY;
   public static final long    DFS_DATANODE_BALANCE_BANDWIDTHPERSEC_DEFAULT =
-      10 * 1024*1024;
+      100 * 1024*1024;
   public static final String  DFS_DATANODE_BALANCE_MAX_NUM_CONCURRENT_MOVES_KEY
       = "dfs.datanode.balance.max.concurrent.moves";
   public static final int
-      DFS_DATANODE_BALANCE_MAX_NUM_CONCURRENT_MOVES_DEFAULT = 50;
+      DFS_DATANODE_BALANCE_MAX_NUM_CONCURRENT_MOVES_DEFAULT = 100;
   @Deprecated
   public static final String  DFS_DATANODE_READAHEAD_BYTES_KEY =
       HdfsClientConfigKeys.DFS_DATANODE_READAHEAD_BYTES_KEY;

hadoop-hdfs-project/hadoop-hdfs/src/main/resources/hdfs-default.xml

@@ -990,7 +990,7 @@
 
 <property>
   <name>dfs.datanode.balance.bandwidthPerSec</name>
-  <value>10m</value>
+  <value>100m</value>
   <description>
         Specifies the maximum amount of bandwidth that each datanode
         can utilize for the balancing purpose in term of
@@ -4068,7 +4068,7 @@
 
 <property>
   <name>dfs.datanode.balance.max.concurrent.moves</name>
-  <value>50</value>
+  <value>100</value>
   <description>
     Maximum number of threads for Datanode balancer pending moves.  This
     value is reconfigurable via the "dfsadmin -reconfig" command.