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-rw-r--r--src/rgw/rgw_gc.cc528
1 files changed, 528 insertions, 0 deletions
diff --git a/src/rgw/rgw_gc.cc b/src/rgw/rgw_gc.cc
new file mode 100644
index 00000000..0b99e087
--- /dev/null
+++ b/src/rgw/rgw_gc.cc
@@ -0,0 +1,528 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "rgw_gc.h"
+
+#include "include/scope_guard.h"
+#include "rgw_tools.h"
+#include "include/rados/librados.hpp"
+#include "cls/rgw/cls_rgw_client.h"
+#include "cls/refcount/cls_refcount_client.h"
+#include "rgw_perf_counters.h"
+#include "cls/lock/cls_lock_client.h"
+#include "include/random.h"
+
+#include <list> // XXX
+#include <sstream>
+
+#define dout_context g_ceph_context
+#define dout_subsys ceph_subsys_rgw
+
+using namespace librados;
+
+static string gc_oid_prefix = "gc";
+static string gc_index_lock_name = "gc_process";
+
+
+void RGWGC::initialize(CephContext *_cct, RGWRados *_store) {
+ cct = _cct;
+ store = _store;
+
+ max_objs = min(static_cast<int>(cct->_conf->rgw_gc_max_objs), rgw_shards_max());
+
+ obj_names = new string[max_objs];
+
+ for (int i = 0; i < max_objs; i++) {
+ obj_names[i] = gc_oid_prefix;
+ char buf[32];
+ snprintf(buf, 32, ".%d", i);
+ obj_names[i].append(buf);
+ }
+}
+
+void RGWGC::finalize()
+{
+ delete[] obj_names;
+}
+
+int RGWGC::tag_index(const string& tag)
+{
+ return rgw_shard_id(tag, max_objs);
+}
+
+void RGWGC::add_chain(ObjectWriteOperation& op, cls_rgw_obj_chain& chain, const string& tag)
+{
+ cls_rgw_gc_obj_info info;
+ info.chain = chain;
+ info.tag = tag;
+
+ cls_rgw_gc_set_entry(op, cct->_conf->rgw_gc_obj_min_wait, info);
+}
+
+int RGWGC::send_chain(cls_rgw_obj_chain& chain, const string& tag, bool sync)
+{
+ ObjectWriteOperation op;
+ add_chain(op, chain, tag);
+
+ int i = tag_index(tag);
+
+ if (sync)
+ return store->gc_operate(obj_names[i], &op);
+
+ return store->gc_aio_operate(obj_names[i], &op);
+}
+
+int RGWGC::defer_chain(const string& tag, bool sync)
+{
+ ObjectWriteOperation op;
+ cls_rgw_gc_defer_entry(op, cct->_conf->rgw_gc_obj_min_wait, tag);
+
+ int i = tag_index(tag);
+
+ if (sync)
+ return store->gc_operate(obj_names[i], &op);
+
+ return store->gc_aio_operate(obj_names[i], &op);
+}
+
+int RGWGC::remove(int index, const std::vector<string>& tags, AioCompletion **pc)
+{
+ ObjectWriteOperation op;
+ cls_rgw_gc_remove(op, tags);
+ return store->gc_aio_operate(obj_names[index], &op, pc);
+}
+
+int RGWGC::list(int *index, string& marker, uint32_t max, bool expired_only, std::list<cls_rgw_gc_obj_info>& result, bool *truncated)
+{
+ result.clear();
+ string next_marker;
+
+ for (; *index < max_objs && result.size() < max; (*index)++, marker.clear()) {
+ std::list<cls_rgw_gc_obj_info> entries;
+ int ret = cls_rgw_gc_list(store->gc_pool_ctx, obj_names[*index], marker, max - result.size(), expired_only, entries, truncated, next_marker);
+ if (ret == -ENOENT)
+ continue;
+ if (ret < 0)
+ return ret;
+
+ std::list<cls_rgw_gc_obj_info>::iterator iter;
+ for (iter = entries.begin(); iter != entries.end(); ++iter) {
+ result.push_back(*iter);
+ }
+
+ marker = next_marker;
+
+ if (*index == max_objs - 1) {
+ /* we cut short here, truncated will hold the correct value */
+ return 0;
+ }
+
+ if (result.size() == max) {
+ /* close approximation, it might be that the next of the objects don't hold
+ * anything, in this case truncated should have been false, but we can find
+ * that out on the next iteration
+ */
+ *truncated = true;
+ return 0;
+ }
+
+ }
+ *truncated = false;
+
+ return 0;
+}
+
+class RGWGCIOManager {
+ const DoutPrefixProvider* dpp;
+ CephContext *cct;
+ RGWGC *gc;
+
+ struct IO {
+ enum Type {
+ UnknownIO = 0,
+ TailIO = 1,
+ IndexIO = 2,
+ } type{UnknownIO};
+ librados::AioCompletion *c{nullptr};
+ string oid;
+ int index{-1};
+ string tag;
+ };
+
+ deque<IO> ios;
+ vector<std::vector<string> > remove_tags;
+ /* tracks the number of remaining shadow objects for a given tag in order to
+ * only remove the tag once all shadow objects have themselves been removed
+ */
+ vector<map<string, size_t> > tag_io_size;
+
+#define MAX_AIO_DEFAULT 10
+ size_t max_aio{MAX_AIO_DEFAULT};
+
+public:
+ RGWGCIOManager(const DoutPrefixProvider* _dpp, CephContext *_cct, RGWGC *_gc) : dpp(_dpp),
+ cct(_cct),
+ gc(_gc),
+ remove_tags(cct->_conf->rgw_gc_max_objs),
+ tag_io_size(cct->_conf->rgw_gc_max_objs) {
+ max_aio = cct->_conf->rgw_gc_max_concurrent_io;
+ }
+
+ ~RGWGCIOManager() {
+ for (auto io : ios) {
+ io.c->release();
+ }
+ }
+
+ int schedule_io(IoCtx *ioctx, const string& oid, ObjectWriteOperation *op,
+ int index, const string& tag) {
+ while (ios.size() > max_aio) {
+ if (gc->going_down()) {
+ return 0;
+ }
+ handle_next_completion();
+ }
+
+ AioCompletion *c = librados::Rados::aio_create_completion(NULL, NULL, NULL);
+ int ret = ioctx->aio_operate(oid, c, op);
+ if (ret < 0) {
+ return ret;
+ }
+ ios.push_back(IO{IO::TailIO, c, oid, index, tag});
+
+ return 0;
+ }
+
+ void handle_next_completion() {
+ ceph_assert(!ios.empty());
+ IO& io = ios.front();
+ io.c->wait_for_safe();
+ int ret = io.c->get_return_value();
+ io.c->release();
+
+ if (ret == -ENOENT) {
+ ret = 0;
+ }
+
+ if (io.type == IO::IndexIO) {
+ if (ret < 0) {
+ ldpp_dout(dpp, 0) << "WARNING: gc cleanup of tags on gc shard index=" <<
+ io.index << " returned error, ret=" << ret << dendl;
+ }
+ goto done;
+ }
+
+ if (ret < 0) {
+ ldpp_dout(dpp, 0) << "WARNING: gc could not remove oid=" << io.oid <<
+ ", ret=" << ret << dendl;
+ goto done;
+ }
+
+ schedule_tag_removal(io.index, io.tag);
+
+ done:
+ ios.pop_front();
+ }
+
+ /* This is a request to schedule a tag removal. It will be called once when
+ * there are no shadow objects. But it will also be called for every shadow
+ * object when there are any. Since we do not want the tag to be removed
+ * until all shadow objects have been successfully removed, the scheduling
+ * will not happen until the shadow object count goes down to zero
+ */
+ void schedule_tag_removal(int index, string tag) {
+ auto& ts = tag_io_size[index];
+ auto ts_it = ts.find(tag);
+ if (ts_it != ts.end()) {
+ auto& size = ts_it->second;
+ --size;
+ // wait all shadow obj delete return
+ if (size != 0)
+ return;
+
+ ts.erase(ts_it);
+ }
+
+ auto& rt = remove_tags[index];
+
+ rt.push_back(tag);
+ if (rt.size() >= (size_t)cct->_conf->rgw_gc_max_trim_chunk) {
+ flush_remove_tags(index, rt);
+ }
+ }
+
+ void add_tag_io_size(int index, string tag, size_t size) {
+ auto& ts = tag_io_size[index];
+ ts.emplace(tag, size);
+ }
+
+ void drain_ios() {
+ while (!ios.empty()) {
+ if (gc->going_down()) {
+ return;
+ }
+ handle_next_completion();
+ }
+ }
+
+ void drain() {
+ drain_ios();
+ flush_remove_tags();
+ /* the tags draining might have generated more ios, drain those too */
+ drain_ios();
+ }
+
+ void flush_remove_tags(int index, vector<string>& rt) {
+ IO index_io;
+ index_io.type = IO::IndexIO;
+ index_io.index = index;
+
+ ldpp_dout(dpp, 20) << __func__ <<
+ " removing entries from gc log shard index=" << index << ", size=" <<
+ rt.size() << ", entries=" << rt << dendl;
+
+ auto rt_guard = make_scope_guard(
+ [&]
+ {
+ rt.clear();
+ }
+ );
+
+ int ret = gc->remove(index, rt, &index_io.c);
+ if (ret < 0) {
+ /* we already cleared list of tags, this prevents us from
+ * ballooning in case of a persistent problem
+ */
+ ldpp_dout(dpp, 0) << "WARNING: failed to remove tags on gc shard index=" <<
+ index << " ret=" << ret << dendl;
+ return;
+ }
+ if (perfcounter) {
+ /* log the count of tags retired for rate estimation */
+ perfcounter->inc(l_rgw_gc_retire, rt.size());
+ }
+ ios.push_back(index_io);
+ }
+
+ void flush_remove_tags() {
+ int index = 0;
+ for (auto& rt : remove_tags) {
+ flush_remove_tags(index, rt);
+ ++index;
+ }
+ }
+}; // class RGWGCIOManger
+
+int RGWGC::process(int index, int max_secs, bool expired_only,
+ RGWGCIOManager& io_manager)
+{
+ ldpp_dout(this, 20) << "RGWGC::process entered with GC index_shard=" <<
+ index << ", max_secs=" << max_secs << ", expired_only=" <<
+ expired_only << dendl;
+
+ rados::cls::lock::Lock l(gc_index_lock_name);
+ utime_t end = ceph_clock_now();
+
+ /* max_secs should be greater than zero. We don't want a zero max_secs
+ * to be translated as no timeout, since we'd then need to break the
+ * lock and that would require a manual intervention. In this case
+ * we can just wait it out. */
+ if (max_secs <= 0)
+ return -EAGAIN;
+
+ end += max_secs;
+ utime_t time(max_secs, 0);
+ l.set_duration(time);
+
+ int ret = l.lock_exclusive(&store->gc_pool_ctx, obj_names[index]);
+ if (ret == -EBUSY) { /* already locked by another gc processor */
+ ldpp_dout(this, 10) << "RGWGC::process failed to acquire lock on " <<
+ obj_names[index] << dendl;
+ return 0;
+ }
+ if (ret < 0)
+ return ret;
+
+ string marker;
+ string next_marker;
+ bool truncated;
+ IoCtx *ctx = new IoCtx;
+ do {
+ int max = 100;
+ std::list<cls_rgw_gc_obj_info> entries;
+
+ ret = cls_rgw_gc_list(store->gc_pool_ctx, obj_names[index], marker, max,
+ expired_only, entries, &truncated, next_marker);
+ ldpp_dout(this, 20) <<
+ "RGWGC::process cls_rgw_gc_list returned with returned:" << ret <<
+ ", entries.size=" << entries.size() << ", truncated=" << truncated <<
+ ", next_marker='" << next_marker << "'" << dendl;
+
+ if (ret == -ENOENT) {
+ ret = 0;
+ goto done;
+ }
+ if (ret < 0)
+ goto done;
+
+ marker = next_marker;
+
+ string last_pool;
+ std::list<cls_rgw_gc_obj_info>::iterator iter;
+ for (iter = entries.begin(); iter != entries.end(); ++iter) {
+ cls_rgw_gc_obj_info& info = *iter;
+
+ ldpp_dout(this, 20) << "RGWGC::process iterating over entry tag='" <<
+ info.tag << "', time=" << info.time << ", chain.objs.size()=" <<
+ info.chain.objs.size() << dendl;
+
+ std::list<cls_rgw_obj>::iterator liter;
+ cls_rgw_obj_chain& chain = info.chain;
+
+ utime_t now = ceph_clock_now();
+ if (now >= end) {
+ goto done;
+ }
+
+ if (chain.objs.empty()) {
+ io_manager.schedule_tag_removal(index, info.tag);
+ } else {
+ io_manager.add_tag_io_size(index, info.tag, chain.objs.size());
+ for (liter = chain.objs.begin(); liter != chain.objs.end(); ++liter) {
+ cls_rgw_obj& obj = *liter;
+
+ if (obj.pool != last_pool) {
+ delete ctx;
+ ctx = new IoCtx;
+ ret = rgw_init_ioctx(store->get_rados_handle(), obj.pool, *ctx);
+ if (ret < 0) {
+ last_pool = "";
+ ldpp_dout(this, 0) << "ERROR: failed to create ioctx pool=" <<
+ obj.pool << dendl;
+ continue;
+ }
+ last_pool = obj.pool;
+ }
+
+ ctx->locator_set_key(obj.loc);
+
+ const string& oid = obj.key.name; /* just stored raw oid there */
+
+ ldpp_dout(this, 5) << "RGWGC::process removing " << obj.pool <<
+ ":" << obj.key.name << dendl;
+ ObjectWriteOperation op;
+ cls_refcount_put(op, info.tag, true);
+
+ ret = io_manager.schedule_io(ctx, oid, &op, index, info.tag);
+ if (ret < 0) {
+ ldpp_dout(this, 0) <<
+ "WARNING: failed to schedule deletion for oid=" << oid << dendl;
+ }
+ if (going_down()) {
+ // leave early, even if tag isn't removed, it's ok since it
+ // will be picked up next time around
+ goto done;
+ }
+ } // chains loop
+ } // else -- chains not empty
+ } // entries loop
+ } while (truncated);
+
+done:
+ /* we don't drain here, because if we're going down we don't want to
+ * hold the system if backend is unresponsive
+ */
+ l.unlock(&store->gc_pool_ctx, obj_names[index]);
+ delete ctx;
+
+ return 0;
+}
+
+int RGWGC::process(bool expired_only)
+{
+ int max_secs = cct->_conf->rgw_gc_processor_max_time;
+
+ const int start = ceph::util::generate_random_number(0, max_objs - 1);
+
+ RGWGCIOManager io_manager(this, store->ctx(), this);
+
+ for (int i = 0; i < max_objs; i++) {
+ int index = (i + start) % max_objs;
+ int ret = process(index, max_secs, expired_only, io_manager);
+ if (ret < 0)
+ return ret;
+ }
+ if (!going_down()) {
+ io_manager.drain();
+ }
+
+ return 0;
+}
+
+bool RGWGC::going_down()
+{
+ return down_flag;
+}
+
+void RGWGC::start_processor()
+{
+ worker = new GCWorker(this, cct, this);
+ worker->create("rgw_gc");
+}
+
+void RGWGC::stop_processor()
+{
+ down_flag = true;
+ if (worker) {
+ worker->stop();
+ worker->join();
+ }
+ delete worker;
+ worker = NULL;
+}
+
+unsigned RGWGC::get_subsys() const
+{
+ return dout_subsys;
+}
+
+std::ostream& RGWGC::gen_prefix(std::ostream& out) const
+{
+ return out << "garbage collection: ";
+}
+
+void *RGWGC::GCWorker::entry() {
+ do {
+ utime_t start = ceph_clock_now();
+ ldpp_dout(dpp, 2) << "garbage collection: start" << dendl;
+ int r = gc->process(true);
+ if (r < 0) {
+ ldpp_dout(dpp, 0) << "ERROR: garbage collection process() returned error r=" << r << dendl;
+ }
+ ldpp_dout(dpp, 2) << "garbage collection: stop" << dendl;
+
+ if (gc->going_down())
+ break;
+
+ utime_t end = ceph_clock_now();
+ end -= start;
+ int secs = cct->_conf->rgw_gc_processor_period;
+
+ if (secs <= end.sec())
+ continue; // next round
+
+ secs -= end.sec();
+
+ lock.Lock();
+ cond.WaitInterval(lock, utime_t(secs, 0));
+ lock.Unlock();
+ } while (!gc->going_down());
+
+ return NULL;
+}
+
+void RGWGC::GCWorker::stop()
+{
+ Mutex::Locker l(lock);
+ cond.Signal();
+}
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