HDFS-6106. Reduce default for dfs.namenode.path.based.cache.refresh.interval.ms (cmccabe)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1577798 13f79535-47bb-0310-9956-ffa450edef68

Author: cmccabe

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -406,6 +406,9 @@ Release 2.4.0 - UNRELEASED
     HDFS-6084. Namenode UI - "Hadoop" logo link shouldn't go to hadoop
     homepage. (Travis Thompson via wheat9)
 
+    HDFS-6106. Reduce default for
+    dfs.namenode.path.based.cache.refresh.interval.ms (cmccabe)
+
   OPTIMIZATIONS
 
     HDFS-5790. LeaseManager.findPath is very slow when many leases need recovery

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

@@ -242,7 +242,7 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
   public static final int     DFS_NAMENODE_LIST_CACHE_DIRECTIVES_NUM_RESPONSES_DEFAULT = 100;
   public static final String  DFS_NAMENODE_PATH_BASED_CACHE_REFRESH_INTERVAL_MS =
       "dfs.namenode.path.based.cache.refresh.interval.ms";
-  public static final long    DFS_NAMENODE_PATH_BASED_CACHE_REFRESH_INTERVAL_MS_DEFAULT = 300000L;
+  public static final long    DFS_NAMENODE_PATH_BASED_CACHE_REFRESH_INTERVAL_MS_DEFAULT = 30000L;
 
   // Whether to enable datanode's stale state detection and usage for reads
   public static final String DFS_NAMENODE_AVOID_STALE_DATANODE_FOR_READ_KEY = "dfs.namenode.avoid.read.stale.datanode";
@@ -370,7 +370,7 @@ public class DFSConfigKeys extends CommonConfigurationKeys {
   public static final String  DFS_HEARTBEAT_INTERVAL_KEY = "dfs.heartbeat.interval";
   public static final long    DFS_HEARTBEAT_INTERVAL_DEFAULT = 3;
   public static final String  DFS_NAMENODE_PATH_BASED_CACHE_RETRY_INTERVAL_MS = "dfs.namenode.path.based.cache.retry.interval.ms";
-  public static final long    DFS_NAMENODE_PATH_BASED_CACHE_RETRY_INTERVAL_MS_DEFAULT = 60000L;
+  public static final long    DFS_NAMENODE_PATH_BASED_CACHE_RETRY_INTERVAL_MS_DEFAULT = 30000L;
   public static final String  DFS_NAMENODE_DECOMMISSION_INTERVAL_KEY = "dfs.namenode.decommission.interval";
   public static final int     DFS_NAMENODE_DECOMMISSION_INTERVAL_DEFAULT = 30;
   public static final String  DFS_NAMENODE_DECOMMISSION_NODES_PER_INTERVAL_KEY = "dfs.namenode.decommission.nodes.per.interval";

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

@@ -1662,19 +1662,19 @@
 
 <property>
   <name>dfs.namenode.path.based.cache.refresh.interval.ms</name>
-  <value>300000</value>
+  <value>30000</value>
   <description>
     The amount of milliseconds between subsequent path cache rescans.  Path
     cache rescans are when we calculate which blocks should be cached, and on
     what datanodes.
 
-    By default, this parameter is set to 300000, which is five minutes.
+    By default, this parameter is set to 30 seconds.
   </description>
 </property>
 
 <property>
   <name>dfs.namenode.path.based.cache.retry.interval.ms</name>
-  <value>60000</value>
+  <value>30000</value>
   <description>
     When the NameNode needs to uncache something that is cached, or cache
     something that is not cached, it must direct the DataNodes to do so by