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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
4 * Ceph - scalable distributed file system
6 * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
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.
15 /* Metadata Server Monitor
18 #ifndef CEPH_MDSMONITOR_H
19 #define CEPH_MDSMONITOR_H
24 #include "include/types.h"
25 #include "PaxosFSMap.h"
26 #include "PaxosService.h"
27 #include "msg/Messenger.h"
28 #include "messages/MMDSBeacon.h"
29 #include "CommandHandler.h"
31 class FileSystemCommandHandler
;
33 class MDSMonitor
: public PaxosService
, public PaxosFSMap
, protected CommandHandler
{
35 MDSMonitor(Monitor
*mn
, Paxos
*p
, string service_name
);
38 void create_initial() override
;
39 void get_store_prefixes(std::set
<string
>& s
) const override
;
40 void update_from_paxos(bool *need_bootstrap
) override
;
42 void create_pending() override
;
43 void encode_pending(MonitorDBStore::TransactionRef t
) override
;
44 // we don't require full versions; don't encode any.
45 void encode_full(MonitorDBStore::TransactionRef t
) override
{ }
46 version_t
get_trim_to() const override
;
48 bool preprocess_query(MonOpRequestRef op
) override
; // true if processed.
49 bool prepare_update(MonOpRequestRef op
) override
;
50 bool should_propose(double& delay
) override
;
52 bool should_print_status() const {
53 auto& fs
= get_fsmap();
54 auto fs_count
= fs
.filesystem_count();
55 auto standby_count
= fs
.get_num_standby();
56 return fs_count
> 0 || standby_count
> 0;
59 void on_active() override
;
60 void on_restart() override
;
63 void check_sub(Subscription
*sub
);
65 void dump_info(Formatter
*f
);
66 int print_nodes(Formatter
*f
);
69 * Return true if a blacklist was done (i.e. OSD propose needed)
71 bool fail_mds_gid(FSMap
&fsmap
, mds_gid_t gid
);
73 bool is_leader() const override
{ return mon
->is_leader(); }
77 template<int dblV
= 7>
78 void print_map(const FSMap
&m
);
80 void _updated(MonOpRequestRef op
);
82 void _note_beacon(class MMDSBeacon
*m
);
83 bool preprocess_beacon(MonOpRequestRef op
);
84 bool prepare_beacon(MonOpRequestRef op
);
86 bool preprocess_offload_targets(MonOpRequestRef op
);
87 bool prepare_offload_targets(MonOpRequestRef op
);
89 int fail_mds(FSMap
&fsmap
, std::ostream
&ss
,
90 const std::string
&arg
,
91 MDSMap::mds_info_t
*failed_info
);
93 bool preprocess_command(MonOpRequestRef op
);
94 bool prepare_command(MonOpRequestRef op
);
96 int filesystem_command(
99 std::string
const &prefix
,
100 const cmdmap_t
& cmdmap
,
101 std::stringstream
&ss
);
104 struct beacon_info_t
{
105 mono_time stamp
= mono_clock::zero();
108 beacon_info_t(mono_time stamp
, uint64_t seq
) : stamp(stamp
), seq(seq
) {}
110 map
<mds_gid_t
, beacon_info_t
> last_beacon
;
112 std::list
<std::shared_ptr
<FileSystemCommandHandler
> > handlers
;
114 bool maybe_promote_standby(FSMap
& fsmap
, Filesystem
& fs
);
115 bool maybe_resize_cluster(FSMap
&fsmap
, fs_cluster_id_t fscid
);
116 void maybe_replace_gid(FSMap
&fsmap
, mds_gid_t gid
,
117 const MDSMap::mds_info_t
& info
, bool *mds_propose
, bool *osd_propose
);
118 void tick() override
; // check state, take actions
120 int dump_metadata(const FSMap
&fsmap
, const std::string
&who
, Formatter
*f
,
123 void update_metadata(mds_gid_t gid
, const Metadata
& metadata
);
124 void remove_from_metadata(const FSMap
&fsmap
, MonitorDBStore::TransactionRef t
);
125 int load_metadata(map
<mds_gid_t
, Metadata
>& m
);
126 void count_metadata(const std::string
& field
, Formatter
*f
);
128 void count_metadata(const std::string
& field
, map
<string
,int> *out
);
131 // MDS daemon GID to latest health state from that GID
132 std::map
<uint64_t, MDSHealth
> pending_daemon_health
;
133 std::set
<uint64_t> pending_daemon_health_rm
;
135 map
<mds_gid_t
, Metadata
> pending_metadata
;
137 mds_gid_t
gid_from_arg(const FSMap
&fsmap
, const std::string
&arg
, std::ostream
& err
);
139 // When did the mon last call into our tick() method? Used for detecting
140 // when the mon was not updating us for some period (e.g. during slow
141 // election) to reset last_beacon timeouts
142 mono_time last_tick
= mono_clock::zero();