On Fri, 27 Feb 2004, OTR Comm wrote: > Could someone explain the relationship between the swap.state file and > the actual files in the L2 directories?
swap.state contains an index and combined transaction log over which objects are cached where in the L2 directories. > Is the swap.state a database where Squid does it's cache checking and > the L2 directory files where the data is presented from? Yes. > Also, if one of the cache files is deleted, does the swap.state maintain > information about that file? Yes, but Squid automatically recovers when encountering the mismatch. > I am trying to understand how purging items from the cache works, and > realize that has to be some relationship between swap.state and the L2 > files Actually not.. purging operates at a higher level and results in the L2 file to be deleted and a delete operation to be logged in swap.state. > but I looked in the code for client.c (ver 2.5) and client.cc > (ver 3.0) and can not figure out where swap.state or the L2 files are > addressed. The squidclient program just sends a HTTP request to Squid asking it to purge the file. It does not touch the cache directly. It is only Squid himself which modifies the cache files. Regards Henrik
