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Posted to common-dev@hadoop.apache.org by "Saikat Kanjilal (JIRA)" <ji...@apache.org> on 2010/09/20 05:45:33 UTC

[jira] Created: (HADOOP-6961) Integration of Virtualization (such as Xen) with Hadoop tools

Integration of Virtualization (such as Xen) with Hadoop tools
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                 Key: HADOOP-6961
                 URL: https://issues.apache.org/jira/browse/HADOOP-6961
             Project: Hadoop Common
          Issue Type: New Feature
         Environment: All
            Reporter: Saikat Kanjilal


How does one integrate sandboxing of arbitrary user code in C++ and other languages in a VM such as Xen with the Hadoop framework? How does this interact with SGE, Torque, Condor?
As each individual machine has more and more cores/cpus, it makes sense to partition each machine into multiple virtual machines. That gives us a number of benefits:
By assigning a virtual machine to a datanode, we effectively isolate the datanode from the load on the machine caused by other processes, making the datanode more responsive/reliable.
With multiple virtual machines on each machine, we can lower the granularity of hod scheduling units, making it possible to schedule multiple tasktrackers on the same machine, improving the overall utilization of the whole clusters.
With virtualization, we can easily snapshot a virtual cluster before releasing it, making it possible to re-activate the same cluster in the future and start to work from the snapshot.

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