[Pdns-dev] Patch Packet Cache be able to store multiple results for Query Cache

[mital.v]

Hie Ahu,

      I am sending you the patch for making the PacketCache store 
multiple values.(inside CacheContent)
I have used the list <string> data structure instead of string inside 
the CacheContent class.
Please analyze my patch and let me know if any bug is there in the 
patch. I am also waiting for any  suggestions / improvement in my code 
patch.
     My code patch is for version 2.9.21.

     Secondly, I have found one problem in the Packet Cache. It gives me 
packetcache miss even if I am having that content inside the cache. It 
iterates through the whole process of going to backend and storing 
results in packet cache again So I am getting the same value for 
packetcache inserted again.

       It happens only for limited number of records out of my test to 
110K records. It also produces randomly means that in each newer test 
run I am getting that packetcache miss for different records everytime.

      In the pdns-2.9.21 trunk the value field of CacheContent 
(cvalue_t) is flatly overwritten by the new values inside the 
*PacketCache::Insert(key, packet, ttl) *function.Thats why you might not 
have noticed the problem. Please reply if my findings are valid or not.

Throughout the process I have the cache-ttl, query-cache-ttl, and 
negquery-cache-ttl as 1000000.

Thanking you,
Mital Vora.