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// -*- 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) 2013 Inktank, Inc
*
* 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 <memory>
#include <tr1/memory>
#include <errno.h>
#include <map>
#include <list>
#include <string>
#include <sstream>
#include <sys/vfs.h>
#include "messages/MMonHealth.h"
#include "include/types.h"
#include "include/Context.h"
#include "include/assert.h"
#include "common/Formatter.h"
#include "mon/Monitor.h"
#include "mon/QuorumService.h"
#include "mon/DataHealthService.h"
#define dout_subsys ceph_subsys_mon
#undef dout_prefix
#define dout_prefix _prefix(_dout, mon, this)
static ostream& _prefix(std::ostream *_dout, const Monitor *mon,
const DataHealthService *svc) {
assert(mon != NULL);
assert(svc != NULL);
return *_dout << "mon." << mon->name << "@" << mon->rank
<< "(" << mon->get_state_name() << ")." << svc->get_name()
<< "(" << svc->get_epoch() << ") ";
}
void DataHealthService::start_epoch()
{
dout(10) << __func__ << " epoch " << get_epoch() << dendl;
// we are not bound by election epochs, but we should clear the stats
// everytime an election is triggerd. As far as we know, a monitor might
// have been running out of disk space and someone fixed it. We don't want
// to hold the cluster back, even confusing the user, due to some possibly
// outdated stats.
stats.clear();
last_warned_percent = 0;
}
health_status_t DataHealthService::get_health(
Formatter *f,
list<pair<health_status_t,string> > *detail)
{
dout(10) << __func__ << dendl;
if (f) {
f->open_object_section("data_health");
f->open_array_section("mons");
}
health_status_t overall_status = HEALTH_OK;
for (map<entity_inst_t,DataStats>::iterator it = stats.begin();
it != stats.end(); ++it) {
string mon_name = mon->monmap->get_name(it->first.addr);
DataStats& stats = it->second;
health_status_t health_status = HEALTH_OK;
string health_detail;
if (stats.latest_avail_percent <= g_conf->mon_data_avail_crit) {
health_status = HEALTH_ERR;
health_detail = "shutdown iminent!";
} else if (stats.latest_avail_percent <= g_conf->mon_data_avail_warn) {
health_status = HEALTH_WARN;
health_detail = "low disk space!";
}
if (overall_status > health_status)
overall_status = health_status;
if (detail && health_status != HEALTH_OK) {
stringstream ss;
ss << "mon." << mon_name << " addr " << it->first.addr
<< " has " << stats.latest_avail_percent
<< "\% avail disk space -- " << health_detail;
detail->push_back(make_pair(health_status, ss.str()));
}
if (f) {
f->open_object_section("mon");
f->dump_string("name", mon_name.c_str());
f->dump_int("kb_total", stats.kb_total);
f->dump_int("kb_used", stats.kb_used);
f->dump_int("kb_avail", stats.kb_avail);
f->dump_int("avail_percent", stats.latest_avail_percent);
f->dump_stream("last_updated") << stats.last_update;
f->dump_stream("health") << health_status;
if (health_status != HEALTH_OK)
f->dump_string("health_detail", health_detail);
f->close_section();
}
}
if (f) {
f->close_section(); // mons
f->close_section(); // data_health
}
return overall_status;
}
int DataHealthService::update_stats()
{
struct statfs stbuf;
int err = ::statfs(g_conf->mon_data.c_str(), &stbuf);
if (err < 0) {
derr << __func__ << " statfs error: " << cpp_strerror(errno) << dendl;
return -errno;
}
entity_inst_t our_inst = mon->messenger->get_myinst();
DataStats& ours = stats[our_inst];
ours.kb_total = stbuf.f_blocks * stbuf.f_bsize / 1024;
ours.kb_used = (stbuf.f_blocks - stbuf.f_bfree) * stbuf.f_bsize / 1024;
ours.kb_avail = stbuf.f_bavail * stbuf.f_bsize / 1024;
ours.latest_avail_percent = (((float)ours.kb_avail/ours.kb_total)*100);
dout(0) << __func__ << " avail " << ours.latest_avail_percent << "%"
<< " total " << ours.kb_total << " used " << ours.kb_used << " avail " << ours.kb_avail
<< dendl;
ours.last_update = ceph_clock_now(g_ceph_context);
return 0;
}
void DataHealthService::share_stats()
{
dout(10) << __func__ << dendl;
if (!in_quorum())
return;
assert(!stats.empty());
entity_inst_t our_inst = mon->messenger->get_myinst();
assert(stats.count(our_inst) > 0);
DataStats &ours = stats[our_inst];
const set<int>& quorum = mon->get_quorum();
for (set<int>::const_iterator it = quorum.begin();
it != quorum.end(); ++it) {
if (mon->monmap->get_name(*it) == mon->name)
continue;
entity_inst_t inst = mon->monmap->get_inst(*it);
MMonHealth *m = new MMonHealth(HealthService::SERVICE_HEALTH_DATA,
MMonHealth::OP_TELL);
m->data_stats = ours;
dout(20) << __func__ << " send " << *m << " to " << inst << dendl;
mon->messenger->send_message(m, inst);
}
}
void DataHealthService::service_tick()
{
dout(10) << __func__ << dendl;
int err = update_stats();
if (err < 0) {
derr << "something went wrong obtaining our disk stats: "
<< cpp_strerror(err) << dendl;
force_shutdown();
return;
}
if (in_quorum())
share_stats();
DataStats &ours = stats[mon->messenger->get_myinst()];
if (ours.latest_avail_percent <= g_conf->mon_data_avail_crit) {
derr << "reached critical levels of available space on data store"
<< " -- shutdown!" << dendl;
force_shutdown();
return;
}
// we must backoff these warnings, and track how much data is being
// consumed in-between reports to assess if it's worth to log this info,
// otherwise we may very well contribute to the consumption of the
// already low available disk space.
if (ours.latest_avail_percent <= g_conf->mon_data_avail_warn) {
if (ours.latest_avail_percent != last_warned_percent)
mon->clog.warn()
<< "reached concerning levels of available space on data store"
<< " (" << ours.latest_avail_percent << "\% free)\n";
last_warned_percent = ours.latest_avail_percent;
} else {
last_warned_percent = 0;
}
}
void DataHealthService::handle_tell(MMonHealth *m)
{
dout(10) << __func__ << " " << *m << dendl;
assert(m->get_service_op() == MMonHealth::OP_TELL);
stats[m->get_source_inst()] = m->data_stats;
}
bool DataHealthService::service_dispatch(MMonHealth *m)
{
dout(10) << __func__ << " " << *m << dendl;
assert(m->get_service_type() == get_type());
if (!in_quorum()) {
dout(1) << __func__ << " not in quorum -- drop message" << dendl;
m->put();
return false;
}
switch (m->service_op) {
case MMonHealth::OP_TELL:
// someone is telling us their stats
handle_tell(m);
break;
default:
dout(0) << __func__ << " unknown op " << m->service_op << dendl;
assert(0 == "Unknown service op");
break;
}
m->put();
return true;
}
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