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Jupiter v5.0

Note: Please see the the k8s_boostrap/mergetb directory for instructions on how to bootstrap a MergeTB cluster. The provided ansible scripts can be adapted and used to bootstrap clusters in other cloud providers.

Jupiter is an orchestrator for Dispersed Computing (distributed computing with networked computers). Jupiter enables complex computing applications that are specified as directed acyclic graph (DAG)-based task graphs to be distributed across an arbitrary network of computers in such a way as to optimize the execution of the distributed computation.

Depending on the task mapper (i.e. scheduling algorithm) used with the Jupiter framework, the optimizations may be for different objectives. For example, the goal may be to try and minimize the total end to end delay (makespan) of the computation for a single set of data inputs. Jupiter includes both centralized task mappers such as one that performs the classical HEFT (heterogeneous earliest finish time) scheduling algorithm. In order to enable optimization-oriented task mapping, Jupiter also provides tools for profiling the application run time on the compute nodes as well as profiling and monitoring the performance of network links between nodes. Jupiter is built on top of Kubernetes and provides a container-based framework for the dispatching and execution of distributed applications at run-time for both single-shot and pipelined (streaming) computations.

The Jupiter system has three main components:

  • Execution Profiler (EP)
  • DRUPE (Network Profiler)
  • Task Mappers
  • CIRCE (Dispatcher)

Profilers

Jupiter comes with two different profiler tools: DRUPE (Network and Resource Profiler) and an one time Execution Profiler.

DRUPE is a tool to collect information about computational resources as well as network links between compute nodes in a dispersed computing system to a central node. DRUPE consists of a network profiler and a resource profiler.

The onetime Execution Profiler is a tool to collect information about the computation time of the pipelined computations described in the form of a directed acyclic graph (DAG) on each of the networked computation resources. This tool runs a sample execution of the entire DAG on every node to collect the statistics for each of the task in the DAG as well as the makespan of the entire DAG.

Task Mappers

Jupiter comes with the following task mappers: HEFT and HEFT Balanced. These mappers effciently map the tasks of a DAG to the processors such that the makespan of the pipelines processing is optimized.

HEFT i.e., Heterogeneous Earliest Finish Time is a static centralized algorithm for a DAG based task graph that efficiently maps the tasks of the DAG into the processors by taking into account global information about communication delays and execution times.

WAVE (supported in v4.0 and under, see releases) is a distributed scheduler for DAG type task graph that outputs a mapping of tasks to real compute nodes by only taking into acount local profiler statistics. Currently we have two types of WAVE algorithms: WAVE Random and WAVE Greedy.

WAVE Random is a very simple algorithm that maps the tasks to a random node without taking into acount the profiler data.

WAVE Greedy is a Greedy algorithm that uses a weighted sum of different profiler data to map tasks to the compute nodes.

CIRCE

CIRCE is a dispatcher tool for dispersed computing, which can deploy pipelined computations described in the form of a directed acyclic graph (DAG) on multiple geographically dispersed computers (compute nodes). CIRCE deploys each task on the corresponding compute node (from the output of HEFT), uses input and output queues for pipelined execution, and takes care of the data transfer between different tasks.

Instructions

Currently supports: Python 3.6

First, setup your Kubernetes cluster and install kubectl. Enable autocompletion for kubectl. Under the k8s_boostrap folder, we have Ansible recipe books in which we use to bootstrap our clusters. These can be used as a blueprint for preparing your cluster.

Clone and install requirements:

git clone git@github.com:ANRGUSC/Jupiter.git
cd Jupiter
pip install -r k8s_requirements.txt

In the application app_config.yaml fill out the node_map key with the hostnames of your k8s cluster. Set the namespace_prefix key and set the k8s_host key for all tasks listed under the nondag_tasks key. See app_specific_files/example/app_config.yaml for an example with instructions.

In jupiter_config.py, set APP_NAME to your application folder name under app_specific_files/. Use APP_NAME = "example" for the example application. Build all containers. Run scripts in separate shells to parallelize.

cd core
python build_push_exec.py
python build_push_profiler.py
python build_push_mapper.py
python build_push_circe.py

Next, run the Execution Profiler, DRUPE (Network Profiler), and Task Mapper. (Shortcut: for a quick start, you can look under core/samples/ for an example mapping.json file and create a custom one for your k8s cluster. Move it to core/mapping.json and skip launching the profilers and mapper entirely.)

python launch_exec_profiler.py
python launch_net_profiler.py
python launch_mapper.py

The Task Mapper will poll the DRUPE home pod until network profiling is complete. This takes about 15 minutes. When it's done, launch_mapper.py will exit and produce a mapping.json file under core/. You can shutdown the profilers.

python delete_all_exec.py
python delete_all_profilers.py

CIRCE will use this to launch the right task as a pod on the correct k8s node.

python launch_circe.py

Use kubectl logs -n={namespace_prefix}-circe to read stdout of task containers. To teardown your application,

python delete_all_circe.py

If you make changes to anything under your application directory, you must rebuild all CIRCE containers before re-running. For example after any code change, you can redeploy using the same mapping.json by following these steps.

python delete_all_circe.py
python build_push_circe.py
python launch_circe.py

Applications:

Jupiter accepts pipelined computations described in a form of a Graph where the main task flow is represented as a Directed Acyclic Graph (DAG). Jupiter also allows the ability to orchestrate containers on specific nodes that are not part of the main DAG. We differentiate the two as "DAG tasks" and "non-DAG tasks."

The example application under app_specific_files/core utilizes the key features of Jupiter. Read the corresponding app_config.yaml to better understand the components.

References

[1] Pradipta Ghosh, Quynh Nguyen, and Bhaskar Krishnamachari, “Container Orchestration for Dispersed Computing“, 5th International Workshop on Container Technologies and Container Clouds (WOC ’19), December 9–13, 2019, Davis, CA, USA.

[2] Quynh Nguyen, Pradipta Ghosh, and Bhaskar Krishnamachari, “End-to-End Network Performance Monitoring for Dispersed Computing“, International Conference on Computing, Networking and Communications, March 2018

[3] Pranav Sakulkar, Pradipta Ghosh, Aleksandra Knezevic, Jiatong Wang, Quynh Nguyen, Jason Tran, H.V. Krishna Giri Narra, Zhifeng Lin, Songze Li, Ming Yu, Bhaskar Krishnamachari, Salman Avestimehr, and Murali Annavaram, “WAVE: A Distributed Scheduling Framework for Dispersed Computing“, USC ANRG Technical Report, ANRG-2018-01.

[4] Aleksandra Knezevic, Quynh Nguyen, Jason A. Tran, Pradipta Ghosh, Pranav Sakulkar, Bhaskar Krishnamachari, and Murali Annavaram, “DEMO: CIRCE – A runtime scheduler for DAG-based dispersed computing,”, The Second ACM/IEEE Symposium on Edge Computing (SEC) 2017. (poster)

Acknowledgment

This material is based upon work supported by Defense Advanced Research Projects Agency (DARPA) under Contract No. HR001117C0053. Any views, opinions, and/or findings expressed are those of the author(s) and should not be interpreted as representing the official views or policies of the Department of Defense or the U.S. Government.

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Jupiter is an orchestrator for Dispersed (Networked) Computing that uses Docker containers and Kubernetes.

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