java client locking issue

Steven Grimm sgrimm at
Thu Apr 5 01:09:16 UTC 2007

Dustin Sallings wrote:
> I was hoping to add UDP support to my client, but my preliminary 
> testing was a bit disappointing since multi-packet requests were rejected.

Yes, that's a limitation of the current implementation, which was really 
designed to handle reads rather than writes.  The reasoning is that a 
dropped request or response packet in a "get" request can simply be 
treated as a cache miss and dealt with using a simple client-side 
timeout, while a dropped packet on a "set" or "delete" or whatever would 
need to be handled by a retransmission layer somewhere (essentially 
reimplementing TCP in application-level code). Since our application 
expects writes to be reliable, it didn't make much sense to put them on 
an unreliable transport layer.

Also, handling multi-packet requests would make the server-side code 
significantly more stateful and complex, and we wanted to keep the 
server side as simple and short as possible to maximize performance.

Responses, of course, can span multiple packets.


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