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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) 2011 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 <utime.h>
#include <signal.h>
#include "HeartbeatMap.h"
#include "ceph_context.h"
#include "common/errno.h"
#include "common/valgrind.h"
#include "debug.h"
#define dout_subsys ceph_subsys_heartbeatmap
#undef dout_prefix
#define dout_prefix *_dout << "heartbeat_map "
using std::chrono::duration_cast;
using std::chrono::seconds;
using std::string;
namespace ceph {
HeartbeatMap::HeartbeatMap(CephContext *cct)
: m_cct(cct),
m_unhealthy_workers(0),
m_total_workers(0)
{
}
HeartbeatMap::~HeartbeatMap()
{
ceph_assert(m_workers.empty());
}
heartbeat_handle_d *HeartbeatMap::add_worker(const string& name, pthread_t thread_id)
{
std::unique_lock locker{m_rwlock};
ldout(m_cct, 10) << "add_worker '" << name << "'" << dendl;
heartbeat_handle_d *h = new heartbeat_handle_d(name);
ANNOTATE_BENIGN_RACE_SIZED(&h->timeout, sizeof(h->timeout),
"heartbeat_handle_d timeout");
ANNOTATE_BENIGN_RACE_SIZED(&h->suicide_timeout, sizeof(h->suicide_timeout),
"heartbeat_handle_d suicide_timeout");
m_workers.push_front(h);
h->list_item = m_workers.begin();
h->thread_id = thread_id;
return h;
}
void HeartbeatMap::remove_worker(const heartbeat_handle_d *h)
{
std::unique_lock locker{m_rwlock};
ldout(m_cct, 10) << "remove_worker '" << h->name << "'" << dendl;
m_workers.erase(h->list_item);
delete h;
}
bool HeartbeatMap::_check(const heartbeat_handle_d *h, const char *who,
ceph::coarse_mono_time now)
{
bool healthy = true;
if (auto was = h->timeout.load(std::memory_order_relaxed);
!clock::is_zero(was) && was < now) {
ldout(m_cct, 1) << who << " '" << h->name << "'"
<< " had timed out after " << h->grace << dendl;
healthy = false;
}
if (auto was = h->suicide_timeout.load(std::memory_order_relaxed);
!clock::is_zero(was) && was < now) {
ldout(m_cct, 1) << who << " '" << h->name << "'"
<< " had suicide timed out after " << h->suicide_grace << dendl;
pthread_kill(h->thread_id, SIGABRT);
sleep(1);
ceph_abort_msg("hit suicide timeout");
}
return healthy;
}
void HeartbeatMap::reset_timeout(heartbeat_handle_d *h,
ceph::timespan grace,
ceph::timespan suicide_grace)
{
ldout(m_cct, 20) << "reset_timeout '" << h->name << "' grace " << grace
<< " suicide " << suicide_grace << dendl;
const auto now = clock::now();
_check(h, "reset_timeout", now);
h->timeout.store(now + grace, std::memory_order_relaxed);
h->grace = grace;
if (suicide_grace > ceph::timespan::zero()) {
h->suicide_timeout.store(now + suicide_grace, std::memory_order_relaxed);
} else {
h->suicide_timeout.store(clock::zero(), std::memory_order_relaxed);
}
h->suicide_grace = suicide_grace;
}
void HeartbeatMap::clear_timeout(heartbeat_handle_d *h)
{
ldout(m_cct, 20) << "clear_timeout '" << h->name << "'" << dendl;
auto now = clock::now();
_check(h, "clear_timeout", now);
h->timeout.store(clock::zero(), std::memory_order_relaxed);
h->suicide_timeout.store(clock::zero(), std::memory_order_relaxed);
}
bool HeartbeatMap::is_healthy()
{
int unhealthy = 0;
int total = 0;
m_rwlock.lock_shared();
auto now = ceph::coarse_mono_clock::now();
if (m_cct->_conf->heartbeat_inject_failure) {
ldout(m_cct, 0) << "is_healthy injecting failure for next " << m_cct->_conf->heartbeat_inject_failure << " seconds" << dendl;
m_inject_unhealthy_until = now + std::chrono::seconds(m_cct->_conf->heartbeat_inject_failure);
m_cct->_conf.set_val("heartbeat_inject_failure", "0");
}
bool healthy = true;
if (now < m_inject_unhealthy_until) {
auto sec = std::chrono::duration_cast<std::chrono::seconds>(m_inject_unhealthy_until - now).count();
ldout(m_cct, 0) << "is_healthy = false, injected failure for next "
<< sec << " seconds" << dendl;
healthy = false;
}
for (auto p = m_workers.begin();
p != m_workers.end();
++p) {
heartbeat_handle_d *h = *p;
if (!_check(h, "is_healthy", now)) {
healthy = false;
unhealthy++;
}
total++;
}
m_rwlock.unlock_shared();
m_unhealthy_workers = unhealthy;
m_total_workers = total;
ldout(m_cct, 20) << "is_healthy = " << (healthy ? "healthy" : "NOT HEALTHY")
<< ", total workers: " << total << ", number of unhealthy: " << unhealthy << dendl;
return healthy;
}
int HeartbeatMap::get_unhealthy_workers() const
{
return m_unhealthy_workers;
}
int HeartbeatMap::get_total_workers() const
{
return m_total_workers;
}
void HeartbeatMap::check_touch_file()
{
string path = m_cct->_conf->heartbeat_file;
if (path.length() && is_healthy()) {
int fd = ::open(path.c_str(), O_WRONLY|O_CREAT|O_CLOEXEC, 0644);
if (fd >= 0) {
::utime(path.c_str(), NULL);
::close(fd);
} else {
ldout(m_cct, 0) << "unable to touch " << path << ": "
<< cpp_strerror(errno) << dendl;
}
}
}
}
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