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MXS-1777: Add an EMAverage to the server struct, and a new slave selection criteria.

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This is to support calculating the average from a session, and the slave selection criteria to be able to route based on averages. This commit, like the next one, have TODOs which you should feel free to comment on. Undecided things.
This commit is contained in:
Niclas Antti
2018-07-26 10:21:39 +03:00
parent cdea8aa7be
commit 1e6509423a
6 changed files with 60 additions and 8 deletions
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23
server/core/server.cc
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@ -28,6 +28,9 @@
#include <string>
#include <list>
#include <mutex>
#include <sstream>
#include <maxbase/stopwatch.hh>
#include <maxscale/config.h>
#include <maxscale/service.h>
@ -228,6 +231,7 @@ void server_free(Server* server)
}
delete server->disk_space_threshold;
delete server->response_time;
delete server;
}
@ -551,6 +555,18 @@ dprintServer(DCB *dcb, const SERVER *server)
dcb_printf(dcb, "\tCurrent no. of conns: %d\n", server->stats.n_current);
dcb_printf(dcb, "\tCurrent no. of operations: %d\n", server->stats.n_current_ops);
dcb_printf(dcb, "\tNumber of routed packets: %lu\n", server->stats.packets);
std::ostringstream ave_os;
if (server->response_time->num_samples())
{
maxbase::Duration dur(server->response_time->average());
ave_os << dur;
}
else
{
ave_os << "not available";
}
dcb_printf(dcb, "\tAverage response time: %s\n", ave_os.str().c_str());
if (server->persistpoolmax)
{
dcb_printf(dcb, "\tPersistent pool size: %d\n", server->stats.n_persistent);
@ -1491,3 +1507,10 @@ bool server_set_disk_space_threshold(SERVER *server, const char *disk_space_thre
return rv;
}
void server_add_response_average(SERVER *server, double ave, int num_samples)
{
spinlock_acquire(&server->lock);
server->response_time->add(ave, num_samples);
spinlock_release(&server->lock);
}