-Re: Memory Manager in Hadoop MR
Ted Yu 2010-12-09, 18:17
For 1, TMMT uses ProcessTree to check for task that is running beyond
memory-limits and kills it.
On Thu, Dec 9, 2010 at 3:05 AM, Pedro Costa <[EMAIL PROTECTED]> wrote:
> 1 - Hadoop MR contains a TaskMemoryManagerThread class that is used to
> manage memory usage of tasks running under a TaskTracker. Why Hadoop
> MR needs a class to manage memory? Why it couldn't rely on the JVM, or
> this class is here for another purpose?
> 2 - How the JT knows that a Map or Reduce Task finished? Is through
> the heartbeat?