【hadoop笔记】hadoop_HDFS结构简介(3)

<property>
  <name>dfs.namenode.checkpoint.period</name>
  <value>3600s</value>
</property>

<property>
  <name>dfs.namenode.checkpoint.txns</name>
  <value>1000000</value> 
  <description>操作动作次数</description> 
</property>
<property>
  <name>dfs.namenode.checkpoint.check.period</name>
  <value>60s</value>
  <description> 1 分钟检查一次操作次数</description> 
</property>

<property>
    <name>dfs.blockreport.intervalMsec</name>
    <value>21600000</value>
    <description>Determines block reporting interval in milliseconds.</description>
</property>

<property>
    <name>dfs.datanode.directoryscan.interval</name>
    <value>21600s</value>
    <description>Interval in seconds for Datanode to scan data directories and reconcile the difference between blocks in memory and on the disk.
    Support multiple time unit suffix(case insensitive), as described
    in dfs.heartbeat.interval.
    </description>
</property>

<property>
   <name>dfs.namenode.heartbeat.recheck-interval</name>
   <value>300000</value>
</property>
<property>
   <name>dfs.heartbeat.interval</name>
   <value>3</value>
</property>