GCC Code Coverage Report

Directory: cvmfs/
File: cvmfs/catalog_traversal_parallel.h
Date: 2026-08-23 02:40:52
Exec Total Coverage
Lines: 187 199 94.0%
Branches: 161 244 66.0%
Line Branch Exec Source
1 /**
2 * This file is part of the CernVM File System.
3 */
4
5 #ifndef CVMFS_CATALOG_TRAVERSAL_PARALLEL_H_
6 #define CVMFS_CATALOG_TRAVERSAL_PARALLEL_H_
7
8 #include <stack>
9 #include <string>
10 #include <vector>
11
12 #include "catalog_traversal.h"
13 #include "util/atomic.h"
14 #include "util/exception.h"
15 #include "util/tube.h"
16
17 namespace swissknife {
18
19 /**
20 * This class implements the same functionality as CatalogTraversal, but in
21 * parallel. For common functionality, see the documentation of
22 * CatalogTraversal. Differences:
23 * - can choose number of threads
24 * - traversal types change meaning:
25 * - depth-first -> parallelized post-order traversal (parents are processed
26 * after all children are finished)
27 * - breadth-first -> same as original, but parallelized
28 */
29 template<class ObjectFetcherT>
30 class CatalogTraversalParallel : public CatalogTraversalBase<ObjectFetcherT> {
31 public:
32 typedef CatalogTraversalBase<ObjectFetcherT> Base;
33 typedef ObjectFetcherT ObjectFetcherTN;
34 typedef typename ObjectFetcherT::CatalogTN CatalogTN;
35 typedef typename ObjectFetcherT::HistoryTN HistoryTN;
36 typedef CatalogTraversalData<CatalogTN> CallbackDataTN;
37 typedef typename CatalogTN::NestedCatalogList NestedCatalogList;
38 typedef typename Base::Parameters Parameters;
39 typedef typename Base::TraversalType TraversalType;
40 typedef std::vector<shash::Any> HashList;
41
42 1606 explicit CatalogTraversalParallel(const Parameters &params)
43 : CatalogTraversalBase<ObjectFetcherT>(params)
44 1606 , num_threads_(params.num_threads)
45
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 1606 , serialize_callbacks_(params.serialize_callbacks) {
46 1606 atomic_init32(&num_errors_);
47
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 1606 shash::Any null_hash;
48 1606 null_hash.SetNull();
49
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 1606 catalogs_processing_.Init(1024, null_hash, hasher);
50
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 1606 catalogs_done_.Init(1024, null_hash, hasher);
51 1606 pthread_mutex_init(&catalog_callback_lock_, NULL);
52 1606 pthread_mutex_init(&catalogs_lock_, NULL);
53 1606 effective_history_depth_ = this->default_history_depth_;
54 1606 effective_timestamp_threshold_ = this->default_timestamp_threshold_;
55 1606 }
56
57 protected:
58 struct CatalogJob : public CatalogTraversal<ObjectFetcherT>::CatalogJob,
59 public Observable<int> {
60 16197676 explicit CatalogJob(const std::string &path,
61 const shash::Any &hash,
62 const unsigned tree_level,
63 const uint64_t history_depth,
64 CatalogTN *parent = NULL)
65 : CatalogTraversal<ObjectFetcherT>::CatalogJob(path, hash, tree_level,
66 16197676 history_depth, parent) {
67 16197676 atomic_init32(&children_unprocessed);
68 16197676 }
69
70
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 8080012 void WakeParents() { this->NotifyListeners(0); }
71
72 atomic_int32 children_unprocessed;
73 };
74
75 public:
76 /**
77 * Starts the traversal process.
78 * After calling this methods CatalogTraversal will go through all catalogs
79 * and call the registered callback methods for each found catalog.
80 * If something goes wrong in the process, the traversal will be cancelled.
81 *
82 * @return true, when all catalogs were successfully processed. On
83 * failure the traversal is cancelled and false is returned.
84 */
85 899 bool Traverse(const TraversalType type = Base::kBreadthFirst) {
86
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 899 const shash::Any root_catalog_hash = this->GetRepositoryRootCatalogHash();
87
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 899 if (root_catalog_hash.IsNull()) {
88 ✗ return false;
89 }
90
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 899 return Traverse(root_catalog_hash, type);
91 }
92
93 /**
94 * Starts the traversal process at the catalog pointed to by the given hash
95 *
96 * @param root_catalog_hash the entry point into the catalog traversal
97 * @return true when catalogs were successfully traversed
98 */
99 1559 bool Traverse(const shash::Any &root_catalog_hash,
100 const TraversalType type = Base::kBreadthFirst) {
101 // add the root catalog of the repository as the first element on the job
102 // stack
103 3118 if (this->no_repeat_history_
104
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 1559 && catalogs_done_.Contains(root_catalog_hash)) {
105 ✗ return true;
106 }
107 1559 effective_traversal_type_ = type;
108
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 1559 CatalogJob *root_job = new CatalogJob("", root_catalog_hash, 0, 0);
109 1559 PushJob(root_job);
110 1559 return DoTraverse();
111 }
112
113 /**
114 * Start the traversal process from a list of root catalogs. Same as
115 * TraverseRevision function, TraverseList does not traverse into predecessor
116 * catalog revisions and ignores TraversalParameter settings.
117 */
118 434 bool TraverseList(const HashList &root_catalog_list,
119 const TraversalType type = Base::kBreadthFirst) {
120 // Push in reverse order for CatalogTraversal-like behavior
121 434 HashList::const_reverse_iterator i = root_catalog_list.rbegin();
122 434 const HashList::const_reverse_iterator iend = root_catalog_list.rend();
123 434 bool has_pushed = false;
124 {
125 434 MutexLockGuard const m(&catalogs_lock_);
126
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 1595 for (; i != iend; ++i) {
127
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 1161 if (this->no_repeat_history_ && catalogs_done_.Contains(*i)) {
128 102 continue;
129 }
130
131
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 1059 CatalogJob *root_job = new CatalogJob("", *i, 0, 0);
132
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 1059 PushJobUnlocked(root_job);
133 1059 has_pushed = true;
134 }
135 434 }
136 // noop: no catalogs to traverse
137
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 434 if (!has_pushed) {
138 39 return true;
139 }
140 395 effective_traversal_type_ = type;
141 395 effective_history_depth_ = Parameters::kNoHistory;
142 395 effective_timestamp_threshold_ = Parameters::kNoTimestampThreshold;
143
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 395 bool const result = DoTraverse();
144 395 effective_history_depth_ = this->default_history_depth_;
145 395 effective_timestamp_threshold_ = this->default_timestamp_threshold_;
146 395 return result;
147 }
148
149 /**
150 * Starts the traversal process at the catalog pointed to by the given hash
151 * but doesn't traverse into predecessor catalog revisions. This overrides the
152 * TraversalParameter settings provided at construction.
153 *
154 * @param root_catalog_hash the entry point into the catalog traversal
155 * @return true when catalogs were successfully traversed
156 */
157 88 bool TraverseRevision(const shash::Any &root_catalog_hash,
158 const TraversalType type = Base::kBreadthFirst) {
159 88 effective_history_depth_ = Parameters::kNoHistory;
160 88 effective_timestamp_threshold_ = Parameters::kNoTimestampThreshold;
161 88 bool const result = Traverse(root_catalog_hash, type);
162 88 effective_history_depth_ = this->default_history_depth_;
163 88 effective_timestamp_threshold_ = this->default_timestamp_threshold_;
164 88 return result;
165 }
166
167 protected:
168 73935690 static uint32_t hasher(const shash::Any &key) {
169 // Don't start with the first bytes, because == is using them as well
170 return static_cast<uint32_t>(
171 73935690 *(reinterpret_cast<const uint32_t *>(key.digest) + 1));
172 }
173
174 1954 bool DoTraverse() {
175 // Optimal number of threads is yet to be determined. The main event loop
176 // contains a spin-lock, so it should not be more than number of cores.
177 1954 threads_process_ = reinterpret_cast<pthread_t *>(
178 1954 smalloc(sizeof(pthread_t) * num_threads_));
179
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 4524 for (unsigned int i = 0; i < num_threads_; ++i) {
180 2570 int const retval = pthread_create(&threads_process_[i], NULL, MainProcessQueue,
181 this);
182
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 2570 if (retval != 0)
183 ✗ PANIC(kLogStderr, "failed to create thread");
184 }
185
186
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 4524 for (unsigned int i = 0; i < num_threads_; ++i) {
187 2570 int const retval = pthread_join(threads_process_[i], NULL);
188
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 2570 assert(retval == 0);
189 }
190 1954 free(threads_process_);
191
192
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 1954 if (atomic_read32(&num_errors_))
193 44 return false;
194
195
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 1910 assert(catalogs_processing_.size() == 0);
196
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 1910 assert(pre_job_queue_.IsEmpty());
197
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 1910 assert(post_job_queue_.IsEmpty());
198 1910 return true;
199 }
200
201 2570 static void *MainProcessQueue(void *data) {
202 2570 CatalogTraversalParallel<ObjectFetcherT> *traversal = reinterpret_cast<
203 CatalogTraversalParallel<ObjectFetcherT> *>(data);
204 CatalogJob *current_job;
205 while (true) {
206 17684913 current_job = traversal->post_job_queue_.TryPopFront();
207
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 17690281 if (current_job != NULL) {
208 1494101 traversal->ProcessJobPost(current_job);
209 } else {
210 16196180 current_job = traversal->pre_job_queue_.PopFront();
211 // NULL means the master thread tells us to finish
212
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 16197148 if (current_job->hash.IsNull()) {
213
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 2570 delete current_job;
214 2570 break;
215 }
216 16194182 traversal->ProcessJobPre(current_job);
217 }
218 }
219 2570 return NULL;
220 }
221
222 1954 void NotifyFinished() {
223
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 1954 shash::Any null_hash;
224 1954 null_hash.SetNull();
225
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 4524 for (unsigned i = 0; i < num_threads_; ++i) {
226
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 2570 CatalogJob *job = new CatalogJob("", null_hash, 0, 0);
227
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 2570 pre_job_queue_.EnqueueFront(job);
228 }
229 1954 }
230
231 1559 void PushJob(CatalogJob *job) {
232 1559 MutexLockGuard const m(&catalogs_lock_);
233
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 1559 PushJobUnlocked(job);
234 1559 }
235
236 16195106 void PushJobUnlocked(CatalogJob *job) {
237 16195106 catalogs_processing_.Insert(job->hash, job);
238 16195106 pre_job_queue_.EnqueueFront(job);
239 16195106 }
240
241 16193654 void ProcessJobPre(CatalogJob *job) {
242
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 16193654 if (!this->PrepareCatalog(job)) {
243 44 atomic_inc32(&num_errors_);
244
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 44 NotifyFinished();
245 14695065 return;
246 }
247
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 16185734 if (job->ignore) {
248
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 141 FinalizeJob(job);
249 141 return;
250 }
251
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 16185593 NestedCatalogList const catalog_list = job->catalog->ListOwnNestedCatalogs();
252 unsigned int num_children;
253 // Ensure that pushed children won't call ProcessJobPost on this job
254 // before this function finishes
255 {
256 16147445 MutexLockGuard const m(&catalogs_lock_);
257
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 16194877 if (effective_traversal_type_ == Base::kBreadthFirst) {
258
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 8114695 num_children = PushPreviousRevision(job)
259
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 8114695 + PushNestedCatalogs(job, catalog_list);
260 } else {
261
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 8080182 num_children = PushNestedCatalogs(job, catalog_list)
262
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 8080182 + PushPreviousRevision(job);
263 8080182 atomic_write32(&job->children_unprocessed, num_children);
264 }
265
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 16194877 if (!this->CloseCatalog(false, job)) {
266 ✗ atomic_inc32(&num_errors_);
267 ✗ NotifyFinished();
268 }
269 16194877 }
270
271 // breadth-first: can post-process immediately
272 // depth-first: no children -> can post-process immediately
273
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 16194261 if (effective_traversal_type_ == Base::kBreadthFirst || num_children == 0) {
274
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 14700160 ProcessJobPost(job);
275 14692724 return;
276 }
277
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 16186825 }
278
279 16194877 unsigned int PushNestedCatalogs(CatalogJob *job,
280 const NestedCatalogList &catalog_list) {
281 16194877 typename NestedCatalogList::const_iterator i = catalog_list.begin();
282 16194877 typename NestedCatalogList::const_iterator const iend = catalog_list.end();
283 16194877 unsigned int num_children = 0;
284
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 32387851 for (; i != iend; ++i) {
285
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 16192974 if (this->no_repeat_history_ && catalogs_done_.Contains(i->hash)) {
286 2456 continue;
287 }
288
289 CatalogJob *child;
290 32381036 if (!this->no_repeat_history_
291
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 16190518 || !catalogs_processing_.Lookup(i->hash, &child)) {
292
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 16190166 CatalogTN *parent = (this->no_close_) ? job->catalog : NULL;
293
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 32380332 child = new CatalogJob(i->mountpoint.ToString(),
294
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 16190166 i->hash,
295 16190166 job->tree_level + 1,
296
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 16190166 job->history_depth,
297 parent);
298
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 16190166 PushJobUnlocked(child);
299 }
300
301
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 16190518 if (effective_traversal_type_ == Base::kDepthFirst) {
302
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 8079318 child->RegisterListener(&CatalogTraversalParallel::OnChildFinished,
303 this, job);
304 }
305 16190518 ++num_children;
306 }
307 16194877 return num_children;
308 }
309
310 /**
311 * Pushes the previous revision of a root catalog.
312 * @return the number of catalogs pushed on the processing stack
313 */
314 16194877 unsigned int PushPreviousRevision(CatalogJob *job) {
315 // only root catalogs are used for entering a previous revision (graph)
316
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 16194877 if (!job->catalog->IsRoot()) {
317 16190075 return 0;
318 }
319
320
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 4802 const shash::Any previous_revision = job->catalog->GetPreviousRevision();
321
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 4802 if (previous_revision.IsNull()) {
322 344 return 0;
323 }
324
325 // check if the next deeper history level is actually requested
326
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 4458 if (this->IsBelowPruningThresholds(*job, effective_history_depth_,
327 effective_timestamp_threshold_)) {
328 2136 return 0;
329 }
330
331 4644 if (this->no_repeat_history_
332
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 2322 && catalogs_done_.Contains(previous_revision)) {
333 ✗ return 0;
334 }
335
336 CatalogJob *prev_job;
337 4644 if (!this->no_repeat_history_
338
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 2322 || !catalogs_processing_.Lookup(previous_revision, &prev_job)) {
339
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 4644 prev_job = new CatalogJob("", previous_revision, 0,
340
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 2322 job->history_depth + 1);
341
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 2322 PushJobUnlocked(prev_job);
342 }
343
344
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 2322 if (effective_traversal_type_ == Base::kDepthFirst) {
345
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 660 prev_job->RegisterListener(&CatalogTraversalParallel::OnChildFinished,
346 this, job);
347 }
348 2322 return 1;
349 }
350
351 16193337 void ProcessJobPost(CatalogJob *job) {
352 // Save time by keeping catalog open when suitable
353
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 16193337 if (job->catalog == NULL) {
354
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 16193293 if (!this->ReopenCatalog(job)) {
355 4356 atomic_inc32(&num_errors_);
356 ✗ NotifyFinished();
357 ✗ return;
358 }
359 }
360
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 16140097 if (serialize_callbacks_) {
361 16140097 MutexLockGuard const m(&catalog_callback_lock_);
362
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 16194877 this->NotifyListeners(job->GetCallbackData());
363 16194877 } else {
364 ✗ this->NotifyListeners(job->GetCallbackData());
365 }
366
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 16194877 if (!this->no_close_) {
367
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 62629 if (!this->CloseCatalog(true, job)) {
368 ✗ atomic_inc32(&num_errors_);
369 ✗ NotifyFinished();
370 ✗ return;
371 }
372 }
373 16194877 FinalizeJob(job);
374 }
375
376 16194842 void FinalizeJob(CatalogJob *job) {
377 {
378 16194842 MutexLockGuard const m(&catalogs_lock_);
379
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 16195018 catalogs_processing_.Erase(job->hash);
380
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 16195018 catalogs_done_.Insert(job->hash, true);
381 // No more catalogs to process -> finish
382
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 16196928 if (catalogs_processing_.size() == 0 && pre_job_queue_.IsEmpty()
383
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 16196928 && post_job_queue_.IsEmpty()) {
384
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 1910 NotifyFinished();
385 }
386 16195018 }
387
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 16194930 if (effective_traversal_type_ == Base::kDepthFirst) {
388 8080100 job->WakeParents();
389 }
390
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 16193434 delete job;
391 16189694 }
392
393 8078878 void OnChildFinished(const int &a, CatalogJob *job) {
394 // atomic_xadd32 returns value before subtraction -> needs to equal 1
395
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 8078878 if (atomic_xadd32(&job->children_unprocessed, -1) == 1) {
396 1494101 post_job_queue_.EnqueueFront(job);
397 }
398 8079582 }
399
400 unsigned int num_threads_;
401 bool serialize_callbacks_;
402
403 uint64_t effective_history_depth_;
404 time_t effective_timestamp_threshold_;
405 TraversalType effective_traversal_type_;
406
407 pthread_t *threads_process_;
408 atomic_int32 num_errors_;
409
410 Tube<CatalogJob> pre_job_queue_;
411 Tube<CatalogJob> post_job_queue_;
412 SmallHashDynamic<shash::Any, CatalogJob *> catalogs_processing_;
413 SmallHashDynamic<shash::Any, bool> catalogs_done_;
414 pthread_mutex_t catalogs_lock_;
415
416 pthread_mutex_t catalog_callback_lock_;
417 };
418
419 } // namespace swissknife
420
421 #endif // CVMFS_CATALOG_TRAVERSAL_PARALLEL_H_
422