the heartbeat is the way that jobtracker and tasktracker communicate with each
other, tasktracker send heartbeat to jobtracker continuously, and jobtracker
returns the task or something else. tasktracker instance call the func
heartbeat() in jobtracker.java to send heartbeat.
At 2011-12-01
e top of my
>mind), and you can take a look at the logic involved there in selecting any
>form of node (isGoodTarget or summat). Then work your way downwards to see how
>the information flows.
>
>On 07-Dec-2011, at 8:36 AM, 郭冲 wrote:
>
>> Hadoop:The Definitive Guide said th
in TaskTracker.offerService() i see "sleeps for the wait time or until there
are empty slots to schedule tasks", does the taskTracker sent heartbeat every
n seconds (if i set the interval is n) ? if the taskTracker has empty slots
but the interval between now and the last heartbeat is less t
