[Csci551-talk] some thoughts about TA's sample implemenation

[hua liu]

Hi,

I compared my implementation and TA's sample implmentation of ProjA and had some questions in TA's code. Here are my thoughts:

1. What if node A is in e_SegUpdate or in e_FileXchange and now a new node B  joins in. Node B will send tracker a GROUP_SHOW_INTEREST, and tracker will send GROUP_ASSIGN to node A and node B. In TA's code, on reception of GROUP_ASSIGN, node A will generate an error message. But is this actually an error?

2. In TA's code, a node can only start next round of download when the ReqTOTimer expires. That means, even there are no loss in CLNT_SEG_REP, a node must wait timeout to send next GROUP_SHOW_INTEREST. But I think a node should start next round of downloading immediately after it gets all the CLNT_SEG_REP. It should only wait for a timeout if some CLNT_SEG_REPs are lost. 

Correct me if I am wrong. I am wondering how do we handle the first case. Can we just ignore the GROUP_ASSIGN if we are not in e_TrackerSent? 

Thanks!
Hua