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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_MDS_PINGER_H
#define CEPH_MDS_PINGER_H
#include <map>
#include "include/types.h"
#include "msg/msg_types.h"
#include "common/ceph_mutex.h"
#include "common/ceph_time.h"
#include "messages/MMDSPing.h"
#include "mdstypes.h"
class MDSRank;
class MDSPinger {
public:
MDSPinger(MDSRank *mds);
// send a ping message to an mds rank. initialize ping state if
// required.
void send_ping(mds_rank_t rank, const entity_addrvec_t &addr);
// check if a pong response is valid. a pong reponse from an
// mds is valid if at least one ping message was sent to the
// mds and the sequence number in the pong is outstanding.
bool pong_received(mds_rank_t rank, version_t seq);
// reset the ping state for a given rank
void reset_ping(mds_rank_t rank);
// check if a rank is lagging (based on pong response) responding
// to a ping message.
bool is_rank_lagging(mds_rank_t rank);
private:
using clock = ceph::coarse_mono_clock;
using time = ceph::coarse_mono_time;
// Initial Sequence Number (ISN) of the first ping message sent
// by rank 0 to other active ranks (incuding itself).
static constexpr uint64_t MDS_PINGER_ISN = 1;
struct PingState {
version_t last_seq = MDS_PINGER_ISN;
std::map<version_t, time> seq_time_map;
time last_acked_time = clock::now();
};
MDSRank *mds;
// drop this lock when calling ->send_message_mds() else mds might
// deadlock
ceph::mutex lock = ceph::make_mutex("MDSPinger::lock");
std::map<mds_rank_t, PingState> ping_state_by_rank;
};
#endif // CEPH_MDS_PINGER_H
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