ceph/src/mon/DataHealthService.cc

   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) 2013 Inktank, Inc
   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 #include "include/memory.h"
  15 #include <errno.h>
  16 #include <map>
  17 #include <list>
  18 #include <string>
  19 #include <sstream>
  20
  21 #include "acconfig.h"
  22
  23 #ifdef HAVE_SYS_VFS_H
  24 #include <sys/vfs.h>
  25 #endif
  26
  27 #ifdef HAVE_SYS_MOUNT_H
  28 #include <sys/mount.h>
  29 #endif
  30
  31 #ifdef HAVE_SYS_PARAM_H
  32 #include <sys/param.h>
  33 #endif
  34
  35 #include "messages/MMonHealth.h"
  36 #include "include/assert.h"
  37 #include "common/Formatter.h"
  38 #include "common/errno.h"
  39
  40 #include "mon/Monitor.h"
  41 #include "mon/DataHealthService.h"
  42
  43 #define dout_subsys ceph_subsys_mon
  44 #undef dout_prefix
  45 #define dout_prefix _prefix(_dout, mon, this)
  46 static ostream& _prefix(std::ostream *_dout, const Monitor *mon,
  47                         const DataHealthService *svc) {
  48   assert(mon != NULL);
  49   assert(svc != NULL);
  50   return *_dout << "mon." << mon->name << "@" << mon->rank
  51                 << "(" << mon->get_state_name() << ")." << svc->get_name()
  52                 << "(" << svc->get_epoch() << ") ";
  53 }
  54
  55 void DataHealthService::start_epoch()
  56 {
  57   dout(10) << __func__ << " epoch " << get_epoch() << dendl;
  58   // we are not bound by election epochs, but we should clear the stats
  59   // everytime an election is triggerd.  As far as we know, a monitor might
  60   // have been running out of disk space and someone fixed it.  We don't want
  61   // to hold the cluster back, even confusing the user, due to some possibly
  62   // outdated stats.
  63   stats.clear();
  64   last_warned_percent = 0;
  65 }
  66
  67 void DataHealthService::get_health(
  68     list<pair<health_status_t,string> >& summary,
  69     list<pair<health_status_t,string> > *detail)
  70 {
  71   dout(10) << __func__ << dendl;
  72   for (map<entity_inst_t,DataStats>::iterator it = stats.begin();
  73        it != stats.end(); ++it) {
  74     string mon_name = mon->monmap->get_name(it->first.addr);
  75     DataStats& stats = it->second;
  76
  77     health_status_t health_status = HEALTH_OK;
  78     string health_detail;
  79     if (stats.fs_stats.avail_percent <= g_conf->mon_data_avail_crit) {
  80       health_status = HEALTH_ERR;
  81       health_detail = "low disk space, shutdown imminent";
  82     } else if (stats.fs_stats.avail_percent <= g_conf->mon_data_avail_warn) {
  83       health_status = HEALTH_WARN;
  84       health_detail = "low disk space";
  85     }
  86
  87     if (stats.store_stats.bytes_total >= g_conf->mon_data_size_warn) {
  88       if (health_status > HEALTH_WARN)
  89         health_status = HEALTH_WARN;
  90       if (!health_detail.empty())
  91         health_detail.append("; ");
  92       stringstream ss;
  93       ss << "store is getting too big! "
  94          << prettybyte_t(stats.store_stats.bytes_total)
  95          << " >= " << prettybyte_t(g_conf->mon_data_size_warn);
  96       health_detail.append(ss.str());
  97     }
  98
  99     if (health_status != HEALTH_OK) {
 100       stringstream ss;
 101       ss << "mon." << mon_name << " " << health_detail;
 102       summary.push_back(make_pair(health_status, ss.str()));
 103       ss << " -- " <<  stats.fs_stats.avail_percent << "% avail";
 104       if (detail)
 105         detail->push_back(make_pair(health_status, ss.str()));
 106     }
 107   }
 108 }
 109
 110 int DataHealthService::update_store_stats(DataStats &ours)
 111 {
 112   map<string,uint64_t> extra;
 113   uint64_t store_size = mon->store->get_estimated_size(extra);
 114   assert(store_size > 0);
 115
 116   ours.store_stats.bytes_total = store_size;
 117   ours.store_stats.bytes_sst = extra["sst"];
 118   ours.store_stats.bytes_log = extra["log"];
 119   ours.store_stats.bytes_misc = extra["misc"];
 120   ours.last_update = ceph_clock_now();
 121
 122   return 0;
 123 }
 124
 125
 126 int DataHealthService::update_stats()
 127 {
 128   entity_inst_t our_inst = mon->messenger->get_myinst();
 129   DataStats& ours = stats[our_inst];
 130
 131   int err = get_fs_stats(ours.fs_stats, g_conf->mon_data.c_str());
 132   if (err < 0) {
 133     derr << __func__ << " get_fs_stats error: " << cpp_strerror(err) << dendl;
 134     return err;
 135   }
 136   dout(0) << __func__ << " avail " << ours.fs_stats.avail_percent << "%"
 137           << " total " << prettybyte_t(ours.fs_stats.byte_total)
 138           << ", used " << prettybyte_t(ours.fs_stats.byte_used)
 139           << ", avail " << prettybyte_t(ours.fs_stats.byte_avail) << dendl;
 140   ours.last_update = ceph_clock_now();
 141
 142   return update_store_stats(ours);
 143 }
 144
 145 void DataHealthService::share_stats()
 146 {
 147   dout(10) << __func__ << dendl;
 148   if (!in_quorum())
 149     return;
 150
 151   assert(!stats.empty());
 152   entity_inst_t our_inst = mon->messenger->get_myinst();
 153   assert(stats.count(our_inst) > 0);
 154   DataStats &ours = stats[our_inst];
 155   const set<int>& quorum = mon->get_quorum();
 156   for (set<int>::const_iterator it = quorum.begin();
 157        it != quorum.end(); ++it) {
 158     if (mon->monmap->get_name(*it) == mon->name)
 159       continue;
 160     entity_inst_t inst = mon->monmap->get_inst(*it);
 161     MMonHealth *m = new MMonHealth(HealthService::SERVICE_HEALTH_DATA,
 162                                    MMonHealth::OP_TELL);
 163     m->data_stats = ours;
 164     dout(20) << __func__ << " send " << *m << " to " << inst << dendl;
 165     mon->messenger->send_message(m, inst);
 166   }
 167 }
 168
 169 void DataHealthService::service_tick()
 170 {
 171   dout(10) << __func__ << dendl;
 172
 173   int err = update_stats();
 174   if (err < 0) {
 175     derr << "something went wrong obtaining our disk stats: "
 176          << cpp_strerror(err) << dendl;
 177     force_shutdown();
 178     return;
 179   }
 180   if (in_quorum())
 181     share_stats();
 182
 183   DataStats &ours = stats[mon->messenger->get_myinst()];
 184
 185   if (ours.fs_stats.avail_percent <= g_conf->mon_data_avail_crit) {
 186     derr << "reached critical levels of available space on local monitor storage"
 187          << " -- shutdown!" << dendl;
 188     force_shutdown();
 189     return;
 190   }
 191
 192   // we must backoff these warnings, and track how much data is being
 193   // consumed in-between reports to assess if it's worth to log this info,
 194   // otherwise we may very well contribute to the consumption of the
 195   // already low available disk space.
 196   if (ours.fs_stats.avail_percent <= g_conf->mon_data_avail_warn) {
 197     if (ours.fs_stats.avail_percent != last_warned_percent)
 198       mon->clog->warn()
 199         << "reached concerning levels of available space on local monitor storage"
 200         << " (" << ours.fs_stats.avail_percent << "% free)";
 201     last_warned_percent = ours.fs_stats.avail_percent;
 202   } else {
 203     last_warned_percent = 0;
 204   }
 205 }
 206
 207 void DataHealthService::handle_tell(MonOpRequestRef op)
 208 {
 209   op->mark_event("datahealth:handle_tell");
 210   MMonHealth *m = static_cast<MMonHealth*>(op->get_req());
 211   dout(10) << __func__ << " " << *m << dendl;
 212   assert(m->get_service_op() == MMonHealth::OP_TELL);
 213
 214   stats[m->get_source_inst()] = m->data_stats;
 215 }
 216
 217 bool DataHealthService::service_dispatch_op(MonOpRequestRef op)
 218 {
 219   op->mark_event("datahealth:service_dispatch_op");
 220   MMonHealth *m = static_cast<MMonHealth*>(op->get_req());
 221   dout(10) << __func__ << " " << *m << dendl;
 222   assert(m->get_service_type() == get_type());
 223   if (!in_quorum()) {
 224     dout(1) << __func__ << " not in quorum -- drop message" << dendl;
 225     return false;
 226   }
 227
 228   switch (m->service_op) {
 229     case MMonHealth::OP_TELL:
 230       // someone is telling us their stats
 231       handle_tell(op);
 232       break;
 233     default:
 234       dout(0) << __func__ << " unknown op " << m->service_op << dendl;
 235       assert(0 == "Unknown service op");
 236       break;
 237   }
 238   return true;
 239 }