- Added a shorter method
- Create a treeset to sort the nodes
- Add all nodes in the routing table to the treeset
- Then select the top Q nodes required from the treeset
- Just found a major Bug!!! We were doing 160 refreshes looking for nodes with the local nodeId as the lookup ID for all 160 refreshes
- Updated to check for nodes at different distances from the local NodeId
Content Lookup Operation
- We were still using KademliaNode instead of KademliaNode.getNode to use the mini node for comparisons
- Made it an interface
- Implemented the interface and made the changes in the code to use the interface
- We do this because we'll extend the code for SocialKad
- Introduced artificial latency when we're in testing mode
ContentLookup & NodeLookup Operations
- Reduce the wait time between data checks to 10 milliseconds
- Added Information to specify whether we're in a testing environment or a production environment
-- we can use this information to put in network latency, etc
Statistician
- Adding counting the number of sendData and receiveData operations
KademliaNode
- Removed the counting of contentLookup if we're getting the content from local storage
- Returns some times in milliseconds instead of microseconds
KadServer
- Made a few operations synchronized
- Handled the exception when the timer is already canceled
- Renamed the statistics class to Statistician since that's is what it is - a statistician that manages the Kad statistics
- Passed the statistician to our Server to collect data
- We were getting some concurrency exceptions because certain data structures were being modified concurrently
- Solved the issues by synchronizing the methods modifying the data structures
We were getting a concurrency Modification error on the treemap because multiple operations may have been accessing the RoutingTable's getAllNodes() method at once.
- Fixed it by making this method synchronized.
- Routing Table had a save state issue because of the KadConfiguration
-- I removed saving the configuration since this may change from boot to boot
-- Provided a way to set a new configuration to the routing table
-- Updated the serializer/deserializer
- Use all nodes to these operations initially instead of the K-Closest because there may be the case that the K-Closest are offline
- The operation takes care of looking at the K-Closest.
- There was an improvement in the paper page 64 to set a contact as stale and replace it if it's stale, but only if there is a replacement, otherwise just keep a stale count. The stale count is the amount of time a contact failed to respond to a request.
- The above feature is now implemented now.
- Added the management of stale contacts code to insert and removal
Kademlia Node
- The Kademlia class is renamed to KademliaNode - this will now serve as the main node on the network
- The RoutingTable will be a part of this node
Node
- The node class is now a basic class containing information about a node to be used by peers on the network
RoutingTable
- Working on Evicting contacts from the routing table
- Working on Replacement Cache
- Written another simulation to test these new RoutingTable features
- Added the improvement for content refresh operation from the paper, we keep the last time a content was republished, and on content update operations, we only republish if the last republish was before (current time - republishing time interval)
Before the content lookup operation used to lookup a specified set of nodes then return the latest content; a short review of the paper showed that we only lookup until we find the Value then exit as soon as we do. Made the updates to the code.
- Added last seen data to contact
- Contacts are not sorted by lastSeen
- Contact updating last seen time is handled
Built a simulation to test the contact last seen updates
Had a bug in the content lookup operation, if the total amount of content needed was not found, a Routing exception was thrown instead of returning what was found. Fixed the issue!
CLO was timing out even if it had found the specified amount of content needed. Fixed that by exiting after the specified # of content required has been found
