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move refresh period settings to a single place and add some notes about it.

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This commit is contained in:
Miguel Freitas 2014-07-17 11:10:33 -03:00
parent 8ffcef4a5c
commit 17207a8064
1 changed files with 19 additions and 4 deletions
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23
libtorrent/src/kademlia/node.cpp
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@ -61,6 +61,20 @@ POSSIBILITY OF SUCH DAMAGE.
#include "../../src/twister.h" #include "../../src/twister.h"
#define ENABLE_DHT_ITEM_EXPIRE #define ENABLE_DHT_ITEM_EXPIRE
/* refresh dht itens we know by putting them to other peers every 60 minutes.
* this period must be small enough to ensure persistency and big enough to
* not cause too much wasteful network traffic / overhead.
* see http://conferences.sigcomm.org/imc/2007/papers/imc150.pdf for a good
* discussion about that (quote: "These results suggest that periodic
* insertions can be performed at the granularity of hours with little impact
* on data persistence.")
*
* locally generated items are considered "unconfirmed" and have a smaller
* refresh period (1 minute) until we read them back from other nodes.
*/
#define DHT_REFRESH_CONFIRMED minutes(60)
#define DHT_REFRESH_UNCONFIRMED minutes(1)
namespace libtorrent { namespace dht namespace libtorrent { namespace dht
{ {
@ -321,11 +335,12 @@ namespace
ptime getNextRefreshTime(bool confirmed = true) ptime getNextRefreshTime(bool confirmed = true)
{ {
static ptime nextRefreshTime[2] = { ptime(0) }; static ptime nextRefreshTime[2] = { ptime(0), ptime(0) };
nextRefreshTime[confirmed] = std::max( nextRefreshTime[confirmed] = std::max(
nextRefreshTime[confirmed] + milliseconds(500), nextRefreshTime[confirmed] + milliseconds(500),
// add +/-10% diffusion to next refresh time // add +/-10% diffusion to next refresh time
time_now() + minutes(confirmed ? 60 : 1) * ( 0.9 + 0.2 * getRandom() ) time_now() + (confirmed ? DHT_REFRESH_CONFIRMED : DHT_REFRESH_UNCONFIRMED)
* ( 0.9 + 0.2 * getRandom() )
); );
return nextRefreshTime[confirmed]; return nextRefreshTime[confirmed];
} }
@ -568,7 +583,7 @@ bool node_impl::refresh_storage() {
bool did_something = false; bool did_something = false;
ptime const now = time_now(); ptime const now = time_now();
m_next_storage_refresh = now + minutes(60); m_next_storage_refresh = now + DHT_REFRESH_CONFIRMED;
for (dht_storage_table_t::iterator i = m_storage_table.begin(), for (dht_storage_table_t::iterator i = m_storage_table.begin(),
end(m_storage_table.end()); i != end; ++i ) end(m_storage_table.end()); i != end; ++i )
@ -741,7 +756,7 @@ void node_impl::load_storage(entry const* e) {
return; return;
ptime const now = time_now(); ptime const now = time_now();
time_duration const refresh_interval = std::max( minutes(60), e->dict().size() * milliseconds(500) ); time_duration const refresh_interval = std::max( DHT_REFRESH_CONFIRMED, e->dict().size() * milliseconds(500) );
printf("node dht: loading storage... (%lu node_id keys)\n", e->dict().size()); printf("node dht: loading storage... (%lu node_id keys)\n", e->dict().size());