Setting up the following in your hdfs-site.xml will give you 1-minute timeout.
<property>
<name>heartbeat.recheck.interval</name>
<value>15</value>
<description>Determines datanode heartbeat interval in seconds</description>
</property>
If above doesn't work - try the following (seems to be version-dependent):
<property>
<name>dfs.heartbeat.recheck.interval</name>
<value>15</value>
<description>Determines datanode heartbeat interval in seconds.</description>
</property>
Timeout equals to 2 * heartbeat.recheck.interval + 10 * heartbeat.interval. Default forheartbeat.interval is 3 seconds.
