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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | /* | |
4 | * Ceph - scalable distributed file system | |
5 | * | |
6 | * Copyright (C) 2012 Red Hat | |
7 | * | |
8 | * This is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License version 2.1, as published by the Free Software | |
11 | * Foundation. See file COPYING. | |
12 | * | |
13 | */ | |
14 | ||
15 | ||
16 | #ifndef BEACON_STATE_H | |
17 | #define BEACON_STATE_H | |
18 | ||
94b18763 | 19 | #include <boost/utility/string_view.hpp> |
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20 | #include <mutex> |
21 | #include <thread> | |
94b18763 | 22 | |
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23 | #include "include/types.h" |
24 | #include "include/Context.h" | |
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25 | #include "msg/Dispatcher.h" |
26 | #include "messages/MMDSBeacon.h" | |
27 | ||
28 | class MonClient; | |
29 | class MMDSBeacon; | |
30 | class Message; | |
31 | class MDSRank; | |
32 | ||
33 | ||
34 | /** | |
35 | * One of these per MDS. Handle beacon logic in this separate class so | |
36 | * that a busy MDS holding its own lock does not hold up sending beacon | |
37 | * messages to the mon and cause false lagginess. | |
38 | * | |
39 | * So that we can continue to operate while the MDS is holding its own lock, | |
40 | * we keep copies of the data needed to generate beacon messages. The MDS is | |
41 | * responsible for calling Beacon::notify_* when things change. | |
42 | */ | |
43 | class Beacon : public Dispatcher | |
44 | { | |
45 | public: | |
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46 | using clock = ceph::coarse_mono_clock; |
47 | using time = ceph::coarse_mono_time; | |
48 | ||
49 | Beacon(CephContext *cct, MonClient *monc, boost::string_view name); | |
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50 | ~Beacon() override; |
51 | ||
52 | void init(MDSMap const *mdsmap); | |
53 | void shutdown(); | |
54 | ||
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55 | bool ms_can_fast_dispatch_any() const override { return true; } |
56 | bool ms_can_fast_dispatch(const Message *m) const override; | |
57 | void ms_fast_dispatch(Message *m) override; | |
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58 | bool ms_dispatch(Message *m) override; |
59 | void ms_handle_connect(Connection *c) override {} | |
60 | bool ms_handle_reset(Connection *c) override {return false;} | |
61 | void ms_handle_remote_reset(Connection *c) override {} | |
62 | bool ms_handle_refused(Connection *c) override {return false;} | |
63 | ||
64 | void notify_mdsmap(MDSMap const *mdsmap); | |
65 | void notify_health(MDSRank const *mds); | |
66 | ||
67 | void handle_mds_beacon(MMDSBeacon *m); | |
68 | void send(); | |
69 | ||
70 | void set_want_state(MDSMap const *mdsmap, MDSMap::DaemonState const newstate); | |
71 | MDSMap::DaemonState get_want_state() const; | |
72 | ||
73 | /** | |
74 | * Send a beacon, and block until the ack is received from the mon | |
75 | * or `duration` seconds pass, whichever happens sooner. Useful | |
76 | * for emitting a last message on shutdown. | |
77 | */ | |
78 | void send_and_wait(const double duration); | |
79 | ||
80 | bool is_laggy(); | |
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81 | double last_cleared_laggy() const { |
82 | std::unique_lock<std::mutex> lock(mutex); | |
83 | return std::chrono::duration<double>(clock::now()-last_laggy).count(); | |
84 | } | |
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85 | |
86 | private: | |
87 | void _notify_mdsmap(MDSMap const *mdsmap); | |
88 | void _send(); | |
89 | ||
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90 | mutable std::mutex mutex; |
91 | std::thread sender; | |
92 | std::condition_variable cvar; | |
93 | time last_send = time::min(); | |
94 | double beacon_interval = 5.0; | |
95 | bool finished = false; | |
7c673cae | 96 | MonClient* monc; |
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97 | |
98 | // Items we duplicate from the MDS to have access under our own lock | |
99 | std::string name; | |
91327a77 | 100 | version_t epoch = 0; |
7c673cae | 101 | CompatSet compat; |
91327a77 | 102 | mds_rank_t standby_for_rank = MDS_RANK_NONE; |
7c673cae | 103 | std::string standby_for_name; |
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104 | fs_cluster_id_t standby_for_fscid = FS_CLUSTER_ID_NONE; |
105 | bool standby_replay = false; | |
106 | MDSMap::DaemonState want_state = MDSMap::STATE_BOOT; | |
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107 | |
108 | // Internal beacon state | |
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109 | version_t last_seq = 0; // last seq sent to monitor |
110 | std::map<version_t,time> seq_stamp; // seq # -> time sent | |
111 | time last_acked_stamp = time::min(); // last time we sent a beacon that got acked | |
112 | time last_mon_reconnect = time::min(); | |
113 | bool laggy = false; | |
114 | time last_laggy = time::min(); | |
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115 | |
116 | // Health status to be copied into each beacon message | |
117 | MDSHealth health; | |
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118 | }; |
119 | ||
120 | #endif // BEACON_STATE_H |