1. Apply Work Flow Technologies to VO --- A Draft
Chen Dong
China VO
Yunnan Observatory, NAOC
2003/11
2019/4/5
IVOA Small Projects Meeting,2003/ , Peking

2. IVOA Small Projects Meeting,2003/1126-28, Peking
0. Outline
Why?
Work Flow in VO
Works---Now and Future
2019/4/5
IVOA Small Projects Meeting,2003/ , Peking

3. IVOA Small Projects Meeting,2003/1126-28, Peking
1. Why
Astronomy:
A Data Oriented Observational Research Field
Data Acquisition Procedure in Astronomy
Data Processing Procedure in Astronomy
Data Management in Astronomy …
Common Feature:
*Standard Oriented
*Multiple Steps
*Quality Guarantee *…
Observation
Computing
Simulation
Data
Research
2019/4/5
IVOA Small Projects Meeting,2003/ , Peking

4. IVOA Small Projects Meeting,2003/1126-28, Peking
1. Why
VO:
Data Federation
Application: Web Services(?)
Distributed Computing
Distributed Instruments …
A Workbench in future for Astronomers
2019/4/5
IVOA Small Projects Meeting,2003/ , Peking

5. IVOA Small Projects Meeting,2003/1126-28, Peking
1. Why
A Problem:
How to arrange different entities in VO to form a unique application?
The answer is: Work Flow Technologies A D
VO 1
VO 2 C B
Result
2019/4/5
IVOA Small Projects Meeting,2003/ , Peking

6. IVOA Small Projects Meeting,2003/1126-28, Peking
2. Work Flow in VO
In fact, current astronomical researches use work flow, such as:
An Observation Run
A Data Processing Procedure
...
But they are not:
Optimized
Driven automatically …
2019/4/5
IVOA Small Projects Meeting,2003/ , Peking

7. 2. Work Flow in VO A Simple Introduction to Work Flow Technologies
Result Oriented
Modeling working procedures inside VO
Organizing different steps to form a specific working procedure
Improving the efficiency
…..
Modeling procedures
Applying Model to a case
Running
Organize
Analysis & Define
Start
Result
Engineer & Astronomer
End User
2019/4/5
IVOA Small Projects Meeting,2003/ , Peking

8. IVOA Small Projects Meeting,2003/1126-28, Peking
2. Work Flow in VO
A simple example of our current try:
Halpha full disk observation of Sun network, Kunming
Original Work Flow: Need people to drive
Revised Work Flow: Using OS’ scheduling system as engine
Run Automatically without modification
Manually transfer
Data
FTP Script
Computer 1
Computer 2
Deamon for quality guarantee and Compression
Manually Selection/Compression
Storage
2019/4/5
IVOA Small Projects Meeting,2003/ , Peking

9. IVOA Small Projects Meeting,2003/1126-28, Peking
2. Work Flow in VO
Some disadvantages of this effort:
No internal message communication mechanism;
No standards and interface inside;
And so on.
2019/4/5
IVOA Small Projects Meeting,2003/ , Peking

10. IVOA Small Projects Meeting,2003/1126-28, Peking
2. Work Flow in VO
Hence, in future, As:
VO: a workbench consists all kinds of services
Work Flow Tech. : A standard to combine specific services and form a procedure for special research
We think that work flow technologies are important and:
A standard
A standardized interface
A work flow engine …
Shall be included in VO.
2019/4/5
IVOA Small Projects Meeting,2003/ , Peking

11. 3. Works---Now and Future
Our Current Works:
Study the current standards of VO
Try to find a work flow engine (a modified open source one?)
Center the platform on Java2 Technologies(J2EE Platform)
Current Application Integration with VO
Seeking helps from other oversea projects …
2019/4/5
IVOA Small Projects Meeting,2003/ , Peking

12. 3. Works---Now and Future
We propose that:
Pay more attention to work flow technologies in VO
A standard and interface of Work Flow to VO should be started to consider
A prototype work flow engine (open source?) for reference
Compatibility to Current Standards in VO
Interoperability with different VO applications using Work Flow Technologies
International Collaboration
2019/4/5
IVOA Small Projects Meeting,2003/ , Peking

13. 3. Works---Now and Future
And we hope:
IVOA may consider to form a forum in this field
Some works should be started in advance now
Other related things
2019/4/5
IVOA Small Projects Meeting,2003/ , Peking

14. IVOA Small Projects Meeting,2003/1126-28, Peking
Thanks!
2019/4/5
IVOA Small Projects Meeting,2003/ , Peking