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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab ft=cpp
#include <vector>
#include <string>
#include "common/errno.h"
#include "rgw_trim_datalog.h"
#include "rgw_cr_rados.h"
#include "rgw_cr_rest.h"
#include "rgw_datalog.h"
#include "rgw_data_sync.h"
#include "rgw_zone.h"
#include "rgw_bucket.h"
#include "services/svc_zone.h"
#include <boost/asio/yield.hpp>
#define dout_subsys ceph_subsys_rgw
#undef dout_prefix
#define dout_prefix (*_dout << "data trim: ")
namespace {
class DatalogTrimImplCR : public RGWSimpleCoroutine {
const DoutPrefixProvider *dpp;
rgw::sal::RadosStore* store;
boost::intrusive_ptr<RGWAioCompletionNotifier> cn;
int shard;
std::string marker;
std::string* last_trim_marker;
public:
DatalogTrimImplCR(const DoutPrefixProvider *dpp, rgw::sal::RadosStore* store, int shard,
const std::string& marker, std::string* last_trim_marker)
: RGWSimpleCoroutine(store->ctx()), dpp(dpp), store(store), shard(shard),
marker(marker), last_trim_marker(last_trim_marker) {
set_description() << "Datalog trim shard=" << shard
<< " marker=" << marker;
}
int send_request(const DoutPrefixProvider *dpp) override {
set_status() << "sending request";
cn = stack->create_completion_notifier();
return store->svc()->datalog_rados->trim_entries(dpp, shard, marker,
cn->completion());
}
int request_complete() override {
int r = cn->completion()->get_return_value();
ldpp_dout(dpp, 20) << __PRETTY_FUNCTION__ << "(): trim of shard=" << shard
<< " marker=" << marker << " returned r=" << r << dendl;
set_status() << "request complete; ret=" << r;
if (r != -ENODATA) {
return r;
}
// nothing left to trim, update last_trim_marker
if (*last_trim_marker < marker &&
marker != store->svc()->datalog_rados->max_marker()) {
*last_trim_marker = marker;
}
return 0;
}
};
/// return the marker that it's safe to trim up to
const std::string& get_stable_marker(const rgw_data_sync_marker& m)
{
return m.state == m.FullSync ? m.next_step_marker : m.marker;
}
/// populate the container starting with 'dest' with the minimum stable marker
/// of each shard for all of the peers in [first, last)
template <typename IterIn, typename IterOut>
void take_min_markers(IterIn first, IterIn last, IterOut dest)
{
if (first == last) {
return;
}
for (auto p = first; p != last; ++p) {
auto m = dest;
for (auto &shard : p->sync_markers) {
const auto& stable = get_stable_marker(shard.second);
if (*m > stable) {
*m = stable;
}
++m;
}
}
}
} // anonymous namespace
class DataLogTrimCR : public RGWCoroutine {
using TrimCR = DatalogTrimImplCR;
const DoutPrefixProvider *dpp;
rgw::sal::RadosStore* store;
RGWHTTPManager *http;
const int num_shards;
const std::string& zone_id; //< my zone id
std::vector<rgw_data_sync_status> peer_status; //< sync status for each peer
std::vector<std::string> min_shard_markers; //< min marker per shard
std::vector<std::string>& last_trim; //< last trimmed marker per shard
int ret{0};
public:
DataLogTrimCR(const DoutPrefixProvider *dpp, rgw::sal::RadosStore* store, RGWHTTPManager *http,
int num_shards, std::vector<std::string>& last_trim)
: RGWCoroutine(store->ctx()), dpp(dpp), store(store), http(http),
num_shards(num_shards),
zone_id(store->svc()->zone->get_zone().id),
peer_status(store->svc()->zone->get_zone_data_notify_to_map().size()),
min_shard_markers(num_shards,
std::string(store->svc()->datalog_rados->max_marker())),
last_trim(last_trim)
{}
int operate(const DoutPrefixProvider *dpp) override;
};
int DataLogTrimCR::operate(const DoutPrefixProvider *dpp)
{
reenter(this) {
ldpp_dout(dpp, 10) << "fetching sync status for zone " << zone_id << dendl;
set_status("fetching sync status");
yield {
// query data sync status from each sync peer
rgw_http_param_pair params[] = {
{ "type", "data" },
{ "status", nullptr },
{ "source-zone", zone_id.c_str() },
{ nullptr, nullptr }
};
auto p = peer_status.begin();
for (auto& c : store->svc()->zone->get_zone_data_notify_to_map()) {
ldpp_dout(dpp, 20) << "query sync status from " << c.first << dendl;
using StatusCR = RGWReadRESTResourceCR<rgw_data_sync_status>;
spawn(new StatusCR(cct, c.second, http, "/admin/log/", params, &*p),
false);
++p;
}
}
// must get a successful reply from all peers to consider trimming
ret = 0;
while (ret == 0 && num_spawned() > 0) {
yield wait_for_child();
collect_next(&ret);
}
drain_all();
if (ret < 0) {
ldpp_dout(dpp, 4) << "failed to fetch sync status from all peers" << dendl;
return set_cr_error(ret);
}
ldpp_dout(dpp, 10) << "trimming log shards" << dendl;
set_status("trimming log shards");
yield {
// determine the minimum marker for each shard
take_min_markers(peer_status.begin(), peer_status.end(),
min_shard_markers.begin());
for (int i = 0; i < num_shards; i++) {
const auto& m = min_shard_markers[i];
if (m <= last_trim[i]) {
continue;
}
ldpp_dout(dpp, 10) << "trimming log shard " << i
<< " at marker=" << m
<< " last_trim=" << last_trim[i] << dendl;
spawn(new TrimCR(dpp, store, i, m, &last_trim[i]),
true);
}
}
return set_cr_done();
}
return 0;
}
RGWCoroutine* create_admin_data_log_trim_cr(const DoutPrefixProvider *dpp, rgw::sal::RadosStore* store,
RGWHTTPManager *http,
int num_shards,
std::vector<std::string>& markers)
{
return new DataLogTrimCR(dpp, store, http, num_shards, markers);
}
class DataLogTrimPollCR : public RGWCoroutine {
const DoutPrefixProvider *dpp;
rgw::sal::RadosStore* store;
RGWHTTPManager *http;
const int num_shards;
const utime_t interval; //< polling interval
const std::string lock_oid; //< use first data log shard for lock
const std::string lock_cookie;
std::vector<std::string> last_trim; //< last trimmed marker per shard
public:
DataLogTrimPollCR(const DoutPrefixProvider *dpp, rgw::sal::RadosStore* store, RGWHTTPManager *http,
int num_shards, utime_t interval)
: RGWCoroutine(store->ctx()), dpp(dpp), store(store), http(http),
num_shards(num_shards), interval(interval),
lock_oid(store->svc()->datalog_rados->get_oid(0, 0)),
lock_cookie(RGWSimpleRadosLockCR::gen_random_cookie(cct)),
last_trim(num_shards)
{}
int operate(const DoutPrefixProvider *dpp) override;
};
int DataLogTrimPollCR::operate(const DoutPrefixProvider *dpp)
{
reenter(this) {
for (;;) {
set_status("sleeping");
wait(interval);
// request a 'data_trim' lock that covers the entire wait interval to
// prevent other gateways from attempting to trim for the duration
set_status("acquiring trim lock");
yield call(new RGWSimpleRadosLockCR(store->svc()->rados->get_async_processor(), store,
rgw_raw_obj(store->svc()->zone->get_zone_params().log_pool, lock_oid),
"data_trim", lock_cookie,
interval.sec()));
if (retcode < 0) {
// if the lock is already held, go back to sleep and try again later
ldpp_dout(dpp, 4) << "failed to lock " << lock_oid << ", trying again in "
<< interval.sec() << "s" << dendl;
continue;
}
set_status("trimming");
yield call(new DataLogTrimCR(dpp, store, http, num_shards, last_trim));
// note that the lock is not released. this is intentional, as it avoids
// duplicating this work in other gateways
}
}
return 0;
}
RGWCoroutine* create_data_log_trim_cr(const DoutPrefixProvider *dpp, rgw::sal::RadosStore* store,
RGWHTTPManager *http,
int num_shards, utime_t interval)
{
return new DataLogTrimPollCR(dpp, store, http, num_shards, interval);
}
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