Potpourri_5 PTS   5. [2 Points] Imagine multiple producers putting items into the same channel in PTS.  Do the threads need to use mechanisms like pthread’s mutex lock to avoid stepping on one another?  Why or why not?

Security_1 AFS   1. [5 points] Consider the login process in AFS. You are a user of the system and you are assigned a username “user1” and password “pwd123”. You are using the system to make changes to a file right before the assignment deadline and, in a rush, you try to login to the system using the password “pwd1234”. List in detail the steps (the login phase and the potential steps in the bind phase) that will occur when you enter this password till the point you are denied access to the system.

Failures_and_Recovery_2 LRVM   2. [2 points] (True/False with justification) During log truncation, the service continues execution making changes (if need be) to the log. 

Potpourri_4 PTS   4. [2 Points] (True/False with justification) PTS runtime system provides global clock synchronization to enable temporal correlation of timestamped items from different threads into different channels. 

Potpourri_6 QuickSilver   6. [2 points] The number of Transaction Managers (TMs) in Quicksilver (choose one of the following):  One per node in the distributed system  One per transaction tree created in the system  One per application running on Quicksilver  One for the entire distributed system 

Failures_and_Recovery_3c RioVista   The context for this question is the same as the previous question. 3. Consider RioVista, which implements LRVM semantics on top of Rio file cache.   (c) [2 points] Compare the log truncation code of RioVista to that of Satya’s LRVM.

Potpourri_8 QuickSilver   8. [2 points] (True/False with justification) Quicksilver provides a more complete recovery management compared to LRVM. 

Differentiate y = xx   Click ‘True’ when finished

Failures_and_Recovery_5 QuickSilver   5. [2 points] List one pro and one con of the location transparency and server independence of QuickSilver’s IPC protocol, specifically related to performance (not implementation complexity).

Use linear approximation to estimate the value of Calculators are NOT allowed on this problem.   Click ‘True’ when finished