1. OOTI Talks 22-11-2006 18-Apr-19 Johan J. Lukkien, j.j.lukkien@tue.nl
TU/e Informatica, System Architecture and Networking

2. Questions Where are failure models for? Relationships:
(reliable) multicast vs TCP vs. general multicast problem (spanning tree approach)
atomic/reliable multicast / reliable RPC vs. transactions
18-Apr-19
Johan J. Lukkien,
TU/e Informatica, System Architecture and Networking

3. Advice Clear difference between assumptions, problem and solutions
Prepare for time-problems
18-Apr-19
Johan J. Lukkien,
TU/e Informatica, System Architecture and Networking

4. Comment The topics were well-prepared, but more than fits in an hour
18-Apr-19
Johan J. Lukkien,
TU/e Informatica, System Architecture and Networking

5. Questions What do they (=google) do? (rather than how)
abstract problem
Where is the gain?
i.e., why and how does the GFS system solve the suggested issues
avoidance of single hotspot – file manager dispatches request asap
Is GFS an overlay filesystem
relying on local filesystems?
“a chunk is a file”... 2 levels of files?
18-Apr-19
Johan J. Lukkien,
TU/e Informatica, System Architecture and Networking

6. Advice Indicate the separate concerns
ranking, storage, retrieval, crawling, name-space management, load balancing
Explicitly name the problems, or picture them
e.g., which typical operations are supported by a data structure
Listeners read the slides
less text, or slowly coming in
or give enough time
Give an operational idea of the problems, how many reads, writes etc.,
Semantics/terminology: file, chunk, block, .... ?
18-Apr-19
Johan J. Lukkien,
TU/e Informatica, System Architecture and Networking

7. Comments
I find the choice of topic very interesting; relationship between presented facts and underlying problems unclear
I would have given the numbers first
18-Apr-19
Johan J. Lukkien,
TU/e Informatica, System Architecture and Networking