summaryrefslogtreecommitdiffstats
path: root/src/mds/MDSTableClient.cc
blob: 9ded20bb8a86a017dd9d741aeb96437e0137d837 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
// vim: ts=8 sw=2 smarttab
/*
 * Ceph - scalable distributed file system
 *
 * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
 *
 * This is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License version 2.1, as published by the Free Software 
 * Foundation.  See file COPYING.
 * 
 */

#include "MDSMap.h"

#include "MDSContext.h"
#include "msg/Messenger.h"

#include "MDSRank.h"
#include "MDLog.h"
#include "LogSegment.h"

#include "MDSTableClient.h"
#include "events/ETableClient.h"

#include "common/config.h"

#define dout_context g_ceph_context
#define dout_subsys ceph_subsys_mds
#undef dout_prefix
#define dout_prefix *_dout << "mds." << mds->get_nodeid() << ".tableclient(" << get_mdstable_name(table) << ") "


class C_LoggedAck : public MDSLogContextBase {
  MDSTableClient *tc;
  version_t tid;
  MDSRank *get_mds() override { return tc->mds; }
public:
  C_LoggedAck(MDSTableClient *a, version_t t) : tc(a), tid(t) {}
  void finish(int r) override {
    tc->_logged_ack(tid);
  }
};


void MDSTableClient::handle_request(const cref_t<MMDSTableRequest> &m)
{
  dout(10) << "handle_request " << *m << dendl;
  ceph_assert(m->table == table);

  if (mds->get_state() < MDSMap::STATE_RESOLVE) {
    if (mds->get_want_state() == CEPH_MDS_STATE_RESOLVE) {
      mds->wait_for_resolve(new C_MDS_RetryMessage(mds, m));
    }
    return;
  }

  version_t tid = m->get_tid();
  uint64_t reqid = m->reqid;

  switch (m->op) {
  case TABLESERVER_OP_QUERY_REPLY:
    handle_query_result(m);
    break;

  case TABLESERVER_OP_NOTIFY_PREP:
    ceph_assert(g_conf()->mds_kill_mdstable_at != 9);
    handle_notify_prep(m);
    break;
    
  case TABLESERVER_OP_AGREE:
    if (pending_prepare.count(reqid)) {
      dout(10) << "got agree on " << reqid << " atid " << tid << dendl;

      ceph_assert(g_conf()->mds_kill_mdstable_at != 3);

      MDSContext *onfinish = pending_prepare[reqid].onfinish;
      *pending_prepare[reqid].ptid = tid;
      if (pending_prepare[reqid].pbl)
	*pending_prepare[reqid].pbl = m->bl;
      pending_prepare.erase(reqid);
      prepared_update[tid] = reqid;
      if (onfinish) {
        onfinish->complete(0);
      }
    }
    else if (prepared_update.count(tid)) {
      dout(10) << "got duplicated agree on " << reqid << " atid " << tid << dendl;
      ceph_assert(prepared_update[tid] == reqid);
      ceph_assert(!server_ready);
    }
    else if (pending_commit.count(tid)) {
      dout(10) << "stray agree on " << reqid << " tid " << tid
	       << ", already committing, will resend COMMIT" << dendl;
      ceph_assert(!server_ready);
      // will re-send commit when receiving the server ready message
    }
    else {
      dout(10) << "stray agree on " << reqid << " tid " << tid
	       << ", sending ROLLBACK" << dendl;
      ceph_assert(!server_ready);
      auto req = make_message<MMDSTableRequest>(table, TABLESERVER_OP_ROLLBACK, 0, tid);
      mds->send_message_mds(req, mds->get_mds_map()->get_tableserver());
    }
    break;

  case TABLESERVER_OP_ACK:
    if (pending_commit.count(tid) &&
	pending_commit[tid]->pending_commit_tids[table].count(tid)) {
      dout(10) << "got ack on tid " << tid << ", logging" << dendl;
      
      ceph_assert(g_conf()->mds_kill_mdstable_at != 7);
      
      // remove from committing list
      pending_commit[tid]->pending_commit_tids[table].erase(tid);
      pending_commit.erase(tid);

      // log ACK.
      mds->mdlog->start_submit_entry(new ETableClient(table, TABLESERVER_OP_ACK, tid),
				     new C_LoggedAck(this, tid));
    } else {
      dout(10) << "got stray ack on tid " << tid << ", ignoring" << dendl;
    }
    break;

  case TABLESERVER_OP_SERVER_READY:
    ceph_assert(!server_ready);
    server_ready = true;

    if (last_reqid == ~0ULL)
      last_reqid = reqid;

    resend_queries();
    resend_prepares();
    resend_commits();
    break;

  default:
    ceph_abort_msg("unrecognized mds_table_client request op");
  }
}


void MDSTableClient::_logged_ack(version_t tid)
{
  dout(10) << "_logged_ack " << tid << dendl;
  // kick any waiters (LogSegment trim)
  if (ack_waiters.count(tid)) {
    dout(15) << "kicking ack waiters on tid " << tid << dendl;
    mds->queue_waiters(ack_waiters[tid]);
    ack_waiters.erase(tid);
  }
}

void MDSTableClient::_prepare(bufferlist& mutation, version_t *ptid, bufferlist *pbl,
			      MDSContext *onfinish)
{
  if (last_reqid == ~0ULL) {
    dout(10) << "tableserver is not ready yet, waiting for request id" << dendl;
    waiting_for_reqid.push_back(_pending_prepare(onfinish, ptid, pbl, mutation));
    return;
  }

  uint64_t reqid = ++last_reqid;
  dout(10) << "_prepare " << reqid << dendl;

  pending_prepare[reqid].mutation = mutation;
  pending_prepare[reqid].ptid = ptid;
  pending_prepare[reqid].pbl = pbl;
  pending_prepare[reqid].onfinish = onfinish;

  if (server_ready) {
    // send message
    auto req = make_message<MMDSTableRequest>(table, TABLESERVER_OP_PREPARE, reqid);
    req->bl = mutation;
    mds->send_message_mds(req, mds->get_mds_map()->get_tableserver());
  } else
    dout(10) << "tableserver is not ready yet, deferring request" << dendl;
}

void MDSTableClient::commit(version_t tid, LogSegment *ls)
{
  dout(10) << "commit " << tid << dendl;

  ceph_assert(prepared_update.count(tid));
  prepared_update.erase(tid);

  ceph_assert(pending_commit.count(tid) == 0);
  pending_commit[tid] = ls;
  ls->pending_commit_tids[table].insert(tid);

  notify_commit(tid);

  ceph_assert(g_conf()->mds_kill_mdstable_at != 4);

  if (server_ready) {
    // send message
    auto req = make_message<MMDSTableRequest>(table, TABLESERVER_OP_COMMIT, 0, tid);
    mds->send_message_mds(req, mds->get_mds_map()->get_tableserver());
  } else
    dout(10) << "tableserver is not ready yet, deferring request" << dendl;
}



// recovery

void MDSTableClient::got_journaled_agree(version_t tid, LogSegment *ls)
{
  dout(10) << "got_journaled_agree " << tid << dendl;
  ls->pending_commit_tids[table].insert(tid);
  pending_commit[tid] = ls;

  notify_commit(tid);
}

void MDSTableClient::got_journaled_ack(version_t tid)
{
  dout(10) << "got_journaled_ack " << tid << dendl;
  if (pending_commit.count(tid)) {
    pending_commit[tid]->pending_commit_tids[table].erase(tid);
    pending_commit.erase(tid);
  }
}

void MDSTableClient::resend_commits()
{
  for (auto p = pending_commit.begin(); p != pending_commit.end(); ++p) {
    dout(10) << "resending commit on " << p->first << dendl;
    auto req = make_message<MMDSTableRequest>(table, TABLESERVER_OP_COMMIT, 0, p->first);
    mds->send_message_mds(req, mds->get_mds_map()->get_tableserver());
  }
}

void MDSTableClient::resend_prepares()
{
  while (!waiting_for_reqid.empty()) {
    pending_prepare[++last_reqid] = waiting_for_reqid.front();
    waiting_for_reqid.pop_front();
  }

  for (auto p = pending_prepare.begin(); p != pending_prepare.end(); ++p) {
    dout(10) << "resending prepare on " << p->first << dendl;
    auto req = make_message<MMDSTableRequest>(table, TABLESERVER_OP_PREPARE, p->first);
    req->bl = p->second.mutation;
    mds->send_message_mds(req, mds->get_mds_map()->get_tableserver());
  }
}

void MDSTableClient::handle_mds_failure(mds_rank_t who)
{
  if (who != mds->get_mds_map()->get_tableserver())
    return; // do nothing.

  dout(7) << "tableserver mds." << who << " fails" << dendl;
  server_ready = false;
}