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- Should fetch sites.txt or have a local copy of sites.txt, what changes should be made to sites.txt ?
- A new parameter should be added to sites.txt to include teir0 or teir1tier1. Also the region of tier1 sites needs to be specified in sites.txt
- A separate thread should be used for each landmark and Semaphores should be used for locking, so that data from different threads should not inter-mix.
- There should be a limit on the number of threads that can be launched at a time (say 10).
- Should there be extra logging on the reflector or can we rely on the standard web logs which will log each query including time stamp, the client name. What else it logs depends on whether the rewuest request is Get or a Post.
- Where are the results parsed, could be in the reflector or in the Java client. In the client distributes the parsing load, reduces the load on the reflector, simplifies the CGI script.
- What should happen if a landmark responds with a bad data. ( Should it process the error or send the raw data back?). Since there will be some anomalies I suspect the reflector will need to return the full response and anyhow needs to inform the user, so I suspect initially the client will process the response and spot errors etc.) Also if the client parses the result it will probably be easily able to spot problems.
- Special consideration for security as the script ultimately has to be deployed at SLAC (Perl taint option, warning option, special open method etc)
- Need to agree on a common format for the exchange of data.
- Needs a blacklisting mechanism for malicious hosts.
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The ability parameter enables the user to specify whether to use enabled landmarks (ability=1, default) or disabled landmarks (by specifying ability=0). The enabled landmarks are found in;
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http://www.slac.stanford.edu/comp/net/wan-mon/tulip/sites.xml |
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The sites xml files are created a by a trscrontanb running in pinger@pinger.slac.stanford.edu. The script that writes sites.xml is: create_sites-xml.pl. There is also a debug parameter. Use debug=1 or greater if you want debugging output.
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