4 Copyright (C) Ronnie Sahlberg 2009
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, see <http://www.gnu.org/licenses/>.
21 #include "lib/tevent/tevent.h"
22 #include "lib/tdb/include/tdb.h"
23 #include "system/network.h"
24 #include "system/filesys.h"
25 #include "system/dir.h"
26 #include "../include/ctdb_private.h"
28 #include "lib/util/dlinklist.h"
29 #include "lib/tevent/tevent.h"
30 #include "../include/ctdb_private.h"
31 #include "../common/rb_tree.h"
33 #define TIMELIMIT() timeval_current_ofs(10, 0)
34 #define TUNINGDBNAME "vactune.tdb"
36 enum vacuum_child_status { VACUUM_RUNNING, VACUUM_OK, VACUUM_ERROR, VACUUM_TIMEOUT};
38 struct ctdb_vacuum_child_context {
39 struct ctdb_vacuum_child_context *next, *prev;
40 struct ctdb_vacuum_handle *vacuum_handle;
41 /* fd child writes status to */
44 enum vacuum_child_status status;
45 struct timeval start_time;
48 struct ctdb_vacuum_handle {
49 struct ctdb_db_context *ctdb_db;
50 struct ctdb_vacuum_child_context *child_ctx;
54 /* a list of records to possibly delete */
56 uint32_t vacuum_limit;
57 uint32_t repack_limit;
58 struct ctdb_context *ctdb;
59 struct ctdb_db_context *ctdb_db;
60 struct tdb_context *dest_db;
61 trbt_tree_t *delete_tree;
62 uint32_t delete_count;
63 struct ctdb_marshall_buffer **list;
72 /* tuning information stored for every db */
73 struct vacuum_tuning_data {
74 uint32_t last_num_repack;
75 uint32_t last_num_empty;
76 uint32_t last_interval;
77 uint32_t new_interval;
78 struct timeval last_start;
82 /* this structure contains the information for one record to be deleted */
83 struct delete_record_data {
84 struct ctdb_context *ctdb;
85 struct ctdb_db_context *ctdb_db;
86 struct ctdb_ltdb_header hdr;
90 struct delete_records_list {
91 struct ctdb_marshall_buffer *records;
95 static int add_record_to_delete_tree(struct vacuum_data *vdata, TDB_DATA key,
96 struct ctdb_ltdb_header *hdr)
98 struct ctdb_context *ctdb = vdata->ctdb;
99 struct ctdb_db_context *ctdb_db = vdata->ctdb_db;
101 struct delete_record_data *dd;
103 hash = ctdb_hash(&key);
105 if (trbt_lookup32(vdata->delete_tree, hash)) {
106 DEBUG(DEBUG_DEBUG, (__location__ " Hash collission when vacuuming, skipping this record.\n"));
110 /* store key and header indexed by the key hash */
111 dd = talloc_zero(vdata->delete_tree, struct delete_record_data);
113 DEBUG(DEBUG_ERR,(__location__ " Out of memory\n"));
117 dd->ctdb_db = ctdb_db;
118 dd->key.dsize = key.dsize;
119 dd->key.dptr = talloc_memdup(dd, key.dptr, key.dsize);
120 if (dd->key.dptr == NULL) {
121 DEBUG(DEBUG_ERR,(__location__ " Out of memory\n"));
127 trbt_insert32(vdata->delete_tree, hash, dd);
129 vdata->delete_count++;
135 * Add a record to the list of records to be sent
136 * to their lmaster with VACUUM_FETCH.
138 static int add_record_to_vacuum_fetch_list(struct vacuum_data *vdata,
141 struct ctdb_context *ctdb = vdata->ctdb;
142 struct ctdb_rec_data *rec;
146 lmaster = ctdb_lmaster(ctdb, &key);
148 rec = ctdb_marshall_record(vdata->list[lmaster], ctdb->pnn, key, NULL, tdb_null);
150 DEBUG(DEBUG_ERR,(__location__ " Out of memory\n"));
151 vdata->traverse_error = true;
155 old_size = talloc_get_size(vdata->list[lmaster]);
156 vdata->list[lmaster] = talloc_realloc_size(NULL, vdata->list[lmaster],
157 old_size + rec->length);
158 if (vdata->list[lmaster] == NULL) {
159 DEBUG(DEBUG_ERR,(__location__ " Failed to expand\n"));
160 vdata->traverse_error = true;
164 vdata->list[lmaster]->count++;
165 memcpy(old_size+(uint8_t *)vdata->list[lmaster], rec, rec->length);
174 static void ctdb_vacuum_event(struct event_context *ev, struct timed_event *te,
175 struct timeval t, void *private_data);
179 * traverse function for gathering the records that can be deleted
181 static int vacuum_traverse(struct tdb_context *tdb, TDB_DATA key, TDB_DATA data, void *private)
183 struct vacuum_data *vdata = talloc_get_type(private, struct vacuum_data);
184 struct ctdb_context *ctdb = vdata->ctdb;
186 struct ctdb_ltdb_header *hdr;
189 lmaster = ctdb_lmaster(ctdb, &key);
190 if (lmaster >= ctdb->num_nodes) {
191 DEBUG(DEBUG_CRIT, (__location__
192 " lmaster[%u] >= ctdb->num_nodes[%u] for key"
195 (unsigned)ctdb->num_nodes,
196 (unsigned)ctdb_hash(&key)));
200 if (data.dsize != sizeof(struct ctdb_ltdb_header)) {
201 /* its not a deleted record */
205 hdr = (struct ctdb_ltdb_header *)data.dptr;
207 if (hdr->dmaster != ctdb->pnn) {
211 if (lmaster == ctdb->pnn) {
213 * We are both lmaster and dmaster, and the record * is empty.
214 * So we should be able to delete it.
216 res = add_record_to_delete_tree(vdata, key, hdr);
219 * We are not lmaster.
220 * Add the record to the blob ready to send to the nodes.
222 res = add_record_to_vacuum_fetch_list(vdata, key);
229 * traverse the tree of records to delete and marshall them into
232 static void delete_traverse(void *param, void *data)
234 struct delete_record_data *dd = talloc_get_type(data, struct delete_record_data);
235 struct delete_records_list *recs = talloc_get_type(param, struct delete_records_list);
236 struct ctdb_rec_data *rec;
239 rec = ctdb_marshall_record(dd, recs->records->db_id, dd->key, &dd->hdr, tdb_null);
241 DEBUG(DEBUG_ERR, (__location__ " failed to marshall record\n"));
245 old_size = talloc_get_size(recs->records);
246 recs->records = talloc_realloc_size(NULL, recs->records, old_size + rec->length);
247 if (recs->records == NULL) {
248 DEBUG(DEBUG_ERR,(__location__ " Failed to expand\n"));
251 recs->records->count++;
252 memcpy(old_size+(uint8_t *)(recs->records), rec, rec->length);
256 * traverse function for the traversal of the delete_queue,
257 * the fast-path vacuuming list.
259 * - If the record has been migrated off the node
260 * or has been revived (filled with data) on the node,
261 * then skip the record.
263 * - If the current node is the record's lmaster and it is
264 * a record that has never been migrated with data, then
265 * delete the record from the local tdb.
267 * - If the current node is the record's lmaster and it has
268 * been migrated with data, then schedule it for the normal
269 * vacuuming procedure (i.e. add it to the delete_list).
271 * - If the current node is NOT the record's lmaster then
272 * add it to the list of records that are to be sent to
273 * the lmaster with the VACUUM_FETCH message.
275 static void delete_queue_traverse(void *param, void *data)
277 struct delete_record_data *dd =
278 talloc_get_type(data, struct delete_record_data);
279 struct vacuum_data *vdata = talloc_get_type(param, struct vacuum_data);
280 struct ctdb_db_context *ctdb_db = dd->ctdb_db;
281 struct ctdb_context *ctdb = ctdb_db->ctdb; /* or dd->ctdb ??? */
283 struct ctdb_ltdb_header *header;
287 res = tdb_chainlock(ctdb_db->ltdb->tdb, dd->key);
289 DEBUG(DEBUG_ERR, (__location__ " Error getting chainlock.\n"));
293 tdb_data = tdb_fetch(ctdb_db->ltdb->tdb, dd->key);
294 if (tdb_data.dsize < sizeof(struct ctdb_ltdb_header)) {
295 /* Does not exist or not a ctdb record. Skip. */
299 if (tdb_data.dsize > sizeof(struct ctdb_ltdb_header)) {
300 /* The record has been recycled (filled with data). Skip. */
304 header = (struct ctdb_ltdb_header *)tdb_data.dptr;
306 if (header->dmaster != ctdb->pnn) {
307 /* The record has been migrated off the node. Skip. */
312 if (header->rsn != dd->hdr.rsn) {
314 * The record has been migrated off the node and back again.
315 * But not requeued for deletion. Skip it.
321 * We are dmaster, and the record has no data, and it has
322 * not been migrated after it has been queued for deletion.
324 * At this stage, the record could still have been revived locally
325 * and last been written with empty data. This can only be
326 * fixed with the addition of an active or delete flag. (TODO)
329 lmaster = ctdb_lmaster(ctdb_db->ctdb, &dd->key);
331 if (lmaster != ctdb->pnn) {
332 res = add_record_to_vacuum_fetch_list(vdata, dd->key);
336 (__location__ " Error adding record to list "
337 "of records to send to lmaster.\n"));
343 /* use header->flags or dd->hdr.flags ?? */
344 if (dd->hdr.flags & CTDB_REC_FLAG_MIGRATED_WITH_DATA) {
345 res = add_record_to_delete_tree(vdata, dd->key, &dd->hdr);
349 (__location__ " Error adding record to list "
350 "of records for deletion on lmaster.\n"));
353 res = tdb_delete(ctdb_db->ltdb->tdb, dd->key);
357 (__location__ " Error deleting record from local "
363 if (tdb_data.dptr != NULL) {
366 tdb_chainunlock(ctdb_db->ltdb->tdb, dd->key);
372 * read-only traverse the database in order to find
373 * records that can be deleted and try to delete these
374 * records on the other nodes
375 * this executes in the child context
377 static int ctdb_vacuum_db(struct ctdb_db_context *ctdb_db, struct vacuum_data *vdata)
379 struct ctdb_context *ctdb = ctdb_db->ctdb;
380 const char *name = ctdb_db->db_name;
383 ret = ctdb_ctrl_getvnnmap(ctdb, TIMELIMIT(), CTDB_CURRENT_NODE, ctdb, &ctdb->vnn_map);
385 DEBUG(DEBUG_ERR, ("Unable to get vnnmap from local node\n"));
389 pnn = ctdb_ctrl_getpnn(ctdb, TIMELIMIT(), CTDB_CURRENT_NODE);
391 DEBUG(DEBUG_ERR, ("Unable to get pnn from local node\n"));
396 /* the list needs to be of length num_nodes */
397 vdata->list = talloc_array(vdata, struct ctdb_marshall_buffer *, ctdb->num_nodes);
398 if (vdata->list == NULL) {
399 DEBUG(DEBUG_ERR,(__location__ " Out of memory\n"));
402 for (i = 0; i < ctdb->num_nodes; i++) {
403 vdata->list[i] = (struct ctdb_marshall_buffer *)
404 talloc_zero_size(vdata->list,
405 offsetof(struct ctdb_marshall_buffer, data));
406 if (vdata->list[i] == NULL) {
407 DEBUG(DEBUG_ERR,(__location__ " Out of memory\n"));
410 vdata->list[i]->db_id = ctdb_db->db_id;
413 /* read-only traverse, looking for records that might be able to be vacuumed */
414 if (tdb_traverse_read(ctdb_db->ltdb->tdb, vacuum_traverse, vdata) == -1 ||
415 vdata->traverse_error) {
416 DEBUG(DEBUG_ERR,(__location__ " Traverse error in vacuuming '%s'\n", name));
421 * For records where we are not the lmaster,
422 * tell the lmaster to fetch the record.
424 for (i = 0; i < ctdb->num_nodes; i++) {
427 if (ctdb->nodes[i]->pnn == ctdb->pnn) {
431 if (vdata->list[i]->count == 0) {
435 DEBUG(DEBUG_INFO, ("Found %u records for lmaster %u in '%s'\n",
436 vdata->list[i]->count, ctdb->nodes[i]->pnn,
439 data.dsize = talloc_get_size(vdata->list[i]);
440 data.dptr = (void *)vdata->list[i];
441 if (ctdb_client_send_message(ctdb, ctdb->nodes[i]->pnn, CTDB_SRVID_VACUUM_FETCH, data) != 0) {
442 DEBUG(DEBUG_ERR, (__location__ " Failed to send vacuum "
443 "fetch message to %u\n",
444 ctdb->nodes[i]->pnn));
449 /* Process all records we can delete (if any) */
450 if (vdata->delete_count > 0) {
451 struct delete_records_list *recs;
452 TDB_DATA indata, outdata;
454 struct ctdb_node_map *nodemap;
455 uint32_t *active_nodes;
456 int num_active_nodes;
458 recs = talloc_zero(vdata, struct delete_records_list);
460 DEBUG(DEBUG_ERR,(__location__ " Out of memory\n"));
463 recs->records = (struct ctdb_marshall_buffer *)
464 talloc_zero_size(vdata,
465 offsetof(struct ctdb_marshall_buffer, data));
466 if (recs->records == NULL) {
467 DEBUG(DEBUG_ERR,(__location__ " Out of memory\n"));
470 recs->records->db_id = ctdb_db->db_id;
473 * traverse the tree of all records we want to delete and
474 * create a blob we can send to the other nodes.
476 trbt_traversearray32(vdata->delete_tree, 1, delete_traverse, recs);
478 indata.dsize = talloc_get_size(recs->records);
479 indata.dptr = (void *)recs->records;
482 * now tell all the active nodes to delete all these records
486 ret = ctdb_ctrl_getnodemap(ctdb, TIMELIMIT(),
488 recs, /* talloc context */
491 DEBUG(DEBUG_ERR,(__location__ " unable to get node map\n"));
495 active_nodes = list_of_active_nodes(ctdb, nodemap,
496 nodemap, /* talloc context */
497 false /* include self */);
499 num_active_nodes = talloc_get_size(active_nodes)/sizeof(*active_nodes);
501 for (i = 0; i < num_active_nodes; i++) {
502 struct ctdb_marshall_buffer *records;
503 struct ctdb_rec_data *rec;
505 ret = ctdb_control(ctdb, active_nodes[i], 0,
506 CTDB_CONTROL_TRY_DELETE_RECORDS, 0,
507 indata, recs, &outdata, &res,
509 if (ret != 0 || res != 0) {
510 DEBUG(DEBUG_ERR, ("Failed to delete records on "
511 "node %u: ret[%d] res[%d]\n",
512 active_nodes[i], ret, res));
517 * outdata countains the list of records coming back
518 * from the node which the node could not delete
520 records = (struct ctdb_marshall_buffer *)outdata.dptr;
521 rec = (struct ctdb_rec_data *)&records->data[0];
522 while (records->count-- > 1) {
523 TDB_DATA reckey, recdata;
524 struct ctdb_ltdb_header *rechdr;
526 reckey.dptr = &rec->data[0];
527 reckey.dsize = rec->keylen;
528 recdata.dptr = &rec->data[reckey.dsize];
529 recdata.dsize = rec->datalen;
531 if (recdata.dsize < sizeof(struct ctdb_ltdb_header)) {
532 DEBUG(DEBUG_CRIT,(__location__ " bad ltdb record\n"));
535 rechdr = (struct ctdb_ltdb_header *)recdata.dptr;
536 recdata.dptr += sizeof(*rechdr);
537 recdata.dsize -= sizeof(*rechdr);
540 * that other node couldnt delete the record
541 * so we should delete it and thereby remove it from the tree
543 talloc_free(trbt_lookup32(vdata->delete_tree, ctdb_hash(&reckey)));
545 rec = (struct ctdb_rec_data *)(rec->length + (uint8_t *)rec);
549 /* free nodemap and active_nodes */
550 talloc_free(nodemap);
553 * The only records remaining in the tree would be those
554 * records where all other nodes could successfully
555 * delete them, so we can safely delete them on the
556 * lmaster as well. Deletion implictely happens while
557 * we repack the database. The repack algorithm revisits
558 * the tree in order to find the records that don't need
559 * to be copied / repacked.
563 /* this ensures we run our event queue */
564 ctdb_ctrl_getpnn(ctdb, TIMELIMIT(), CTDB_CURRENT_NODE);
571 * traverse function for repacking
573 static int repack_traverse(struct tdb_context *tdb, TDB_DATA key, TDB_DATA data, void *private)
575 struct vacuum_data *vdata = (struct vacuum_data *)private;
578 uint32_t hash = ctdb_hash(&key);
579 struct delete_record_data *kd;
581 * check if we can ignore this record because it's in the delete_tree
583 kd = (struct delete_record_data *)trbt_lookup32(vdata->delete_tree, hash);
585 * there might be hash collisions so we have to compare the keys here to be sure
587 if (kd && kd->key.dsize == key.dsize && memcmp(kd->key.dptr, key.dptr, key.dsize) == 0) {
588 struct ctdb_ltdb_header *hdr = (struct ctdb_ltdb_header *)data.dptr;
590 * we have to check if the record hasn't changed in the meantime in order to
591 * savely remove it from the database
593 if (data.dsize == sizeof(struct ctdb_ltdb_header) &&
594 hdr->dmaster == kd->ctdb->pnn &&
595 ctdb_lmaster(kd->ctdb, &(kd->key)) == kd->ctdb->pnn &&
596 kd->hdr.rsn == hdr->rsn) {
602 if (tdb_store(vdata->dest_db, key, data, TDB_INSERT) != 0) {
603 vdata->traverse_error = true;
613 static int ctdb_repack_tdb(struct tdb_context *tdb, TALLOC_CTX *mem_ctx, struct vacuum_data *vdata)
615 struct tdb_context *tmp_db;
617 if (tdb_transaction_start(tdb) != 0) {
618 DEBUG(DEBUG_ERR,(__location__ " Failed to start transaction\n"));
622 tmp_db = tdb_open("tmpdb", tdb_hash_size(tdb),
623 TDB_INTERNAL|TDB_DISALLOW_NESTING,
625 if (tmp_db == NULL) {
626 DEBUG(DEBUG_ERR,(__location__ " Failed to create tmp_db\n"));
627 tdb_transaction_cancel(tdb);
631 vdata->traverse_error = false;
632 vdata->dest_db = tmp_db;
633 vdata->vacuum = true;
638 * repack and vacuum on-the-fly by not writing the records that are
641 if (tdb_traverse_read(tdb, repack_traverse, vdata) == -1) {
642 DEBUG(DEBUG_ERR,(__location__ " Failed to traverse copying out\n"));
643 tdb_transaction_cancel(tdb);
648 DEBUG(DEBUG_INFO,(__location__ " %u records vacuumed\n", vdata->vacuumed));
650 if (vdata->traverse_error) {
651 DEBUG(DEBUG_ERR,(__location__ " Error during traversal\n"));
652 tdb_transaction_cancel(tdb);
657 if (tdb_wipe_all(tdb) != 0) {
658 DEBUG(DEBUG_ERR,(__location__ " Failed to wipe database\n"));
659 tdb_transaction_cancel(tdb);
664 vdata->traverse_error = false;
665 vdata->dest_db = tdb;
666 vdata->vacuum = false;
669 if (tdb_traverse_read(tmp_db, repack_traverse, vdata) == -1) {
670 DEBUG(DEBUG_ERR,(__location__ " Failed to traverse copying back\n"));
671 tdb_transaction_cancel(tdb);
676 if (vdata->traverse_error) {
677 DEBUG(DEBUG_ERR,(__location__ " Error during second traversal\n"));
678 tdb_transaction_cancel(tdb);
686 if (tdb_transaction_commit(tdb) != 0) {
687 DEBUG(DEBUG_ERR,(__location__ " Failed to commit\n"));
690 DEBUG(DEBUG_INFO,(__location__ " %u records copied\n", vdata->copied));
695 static int update_tuning_db(struct ctdb_db_context *ctdb_db, struct vacuum_data *vdata, uint32_t freelist)
697 TALLOC_CTX *tmp_ctx = talloc_new(NULL);
698 TDB_CONTEXT *tune_tdb;
700 struct vacuum_tuning_data tdata;
701 struct vacuum_tuning_data *tptr;
705 vac_dbname = talloc_asprintf(tmp_ctx, "%s/%s.%u",
706 ctdb_db->ctdb->db_directory_state,
707 TUNINGDBNAME, ctdb_db->ctdb->pnn);
708 if (vac_dbname == NULL) {
709 DEBUG(DEBUG_CRIT,(__location__ " Out of memory error while allocating '%s'\n", vac_dbname));
710 talloc_free(tmp_ctx);
714 flags = ctdb_db->ctdb->valgrinding ? TDB_NOMMAP : 0;
715 flags |= TDB_DISALLOW_NESTING;
716 tune_tdb = tdb_open(vac_dbname, 0,
718 O_RDWR|O_CREAT, 0600);
719 if (tune_tdb == NULL) {
720 DEBUG(DEBUG_ERR,(__location__ " Failed to create/open %s\n", TUNINGDBNAME));
721 talloc_free(tmp_ctx);
725 if (tdb_transaction_start(tune_tdb) != 0) {
726 DEBUG(DEBUG_ERR,(__location__ " Failed to start transaction\n"));
730 key.dptr = discard_const(ctdb_db->db_name);
731 key.dsize = strlen(ctdb_db->db_name);
732 value = tdb_fetch(tune_tdb, key);
734 if (value.dptr != NULL && value.dsize == sizeof(struct vacuum_tuning_data)) {
735 tptr = (struct vacuum_tuning_data *)value.dptr;
739 * re-calc new vacuum interval:
740 * in case no limit was reached we continously increase the interval
741 * until vacuum_max_interval is reached
742 * in case a limit was reached we divide the current interval by 2
743 * unless vacuum_min_interval is reached
745 if (freelist < vdata->repack_limit &&
746 vdata->delete_count < vdata->vacuum_limit) {
747 if (tdata.last_interval < ctdb_db->ctdb->tunable.vacuum_max_interval) {
748 tdata.new_interval = tdata.last_interval * 110 / 100;
749 DEBUG(DEBUG_INFO,("Increasing vacuum interval %u -> %u for %s\n",
750 tdata.last_interval, tdata.new_interval, ctdb_db->db_name));
753 tdata.new_interval = tdata.last_interval / 2;
754 if (tdata.new_interval < ctdb_db->ctdb->tunable.vacuum_min_interval ||
755 tdata.new_interval > ctdb_db->ctdb->tunable.vacuum_max_interval) {
756 tdata.new_interval = ctdb_db->ctdb->tunable.vacuum_min_interval;
758 DEBUG(DEBUG_INFO,("Decreasing vacuum interval %u -> %u for %s\n",
759 tdata.last_interval, tdata.new_interval, ctdb_db->db_name));
761 tdata.last_interval = tdata.new_interval;
763 DEBUG(DEBUG_DEBUG,(__location__ " Cannot find tunedb record for %s. Using default interval\n", ctdb_db->db_name));
764 tdata.last_num_repack = freelist;
765 tdata.last_num_empty = vdata->delete_count;
766 tdata.last_interval = ctdb_db->ctdb->tunable.vacuum_default_interval;
769 if (value.dptr != NULL) {
773 tdata.last_start = vdata->start;
774 tdata.last_duration = timeval_elapsed(&vdata->start);
776 value.dptr = (unsigned char *)&tdata;
777 value.dsize = sizeof(tdata);
779 if (tdb_store(tune_tdb, key, value, 0) != 0) {
780 DEBUG(DEBUG_ERR,(__location__ " Unable to store tundb record for %s\n", ctdb_db->db_name));
781 tdb_transaction_cancel(tune_tdb);
783 talloc_free(tmp_ctx);
786 tdb_transaction_commit(tune_tdb);
788 talloc_free(tmp_ctx);
794 * repack and vaccum a db
795 * called from the child context
797 static int ctdb_vacuum_and_repack_db(struct ctdb_db_context *ctdb_db,
800 uint32_t repack_limit = ctdb_db->ctdb->tunable.repack_limit;
801 uint32_t vacuum_limit = ctdb_db->ctdb->tunable.vacuum_limit;
802 const char *name = ctdb_db->db_name;
804 struct vacuum_data *vdata;
806 size = tdb_freelist_size(ctdb_db->ltdb->tdb);
808 DEBUG(DEBUG_ERR,(__location__ " Failed to get freelist size for '%s'\n", name));
812 vdata = talloc_zero(mem_ctx, struct vacuum_data);
814 DEBUG(DEBUG_ERR,(__location__ " Out of memory\n"));
818 vdata->ctdb = ctdb_db->ctdb;
819 vdata->vacuum_limit = vacuum_limit;
820 vdata->repack_limit = repack_limit;
821 vdata->delete_tree = trbt_create(vdata, 0);
822 vdata->ctdb_db = ctdb_db;
823 if (vdata->delete_tree == NULL) {
824 DEBUG(DEBUG_ERR,(__location__ " Out of memory\n"));
829 vdata->start = timeval_current();
832 * gather all records that can be deleted in vdata
834 if (ctdb_vacuum_db(ctdb_db, vdata) != 0) {
835 DEBUG(DEBUG_ERR,(__location__ " Failed to vacuum '%s'\n", name));
839 * decide if a repack is necessary
841 if (size < repack_limit && vdata->delete_count < vacuum_limit) {
842 update_tuning_db(ctdb_db, vdata, size);
847 DEBUG(DEBUG_INFO,("Repacking %s with %u freelist entries and %u records to delete\n",
848 name, size, vdata->delete_count));
851 * repack and implicitely get rid of the records we can delete
853 if (ctdb_repack_tdb(ctdb_db->ltdb->tdb, mem_ctx, vdata) != 0) {
854 DEBUG(DEBUG_ERR,(__location__ " Failed to repack '%s'\n", name));
855 update_tuning_db(ctdb_db, vdata, size);
859 update_tuning_db(ctdb_db, vdata, size);
865 static int get_vacuum_interval(struct ctdb_db_context *ctdb_db)
867 TALLOC_CTX *tmp_ctx = talloc_new(NULL);
871 uint interval = ctdb_db->ctdb->tunable.vacuum_default_interval;
872 struct ctdb_context *ctdb = ctdb_db->ctdb;
875 vac_dbname = talloc_asprintf(tmp_ctx, "%s/%s.%u", ctdb->db_directory, TUNINGDBNAME, ctdb->pnn);
876 if (vac_dbname == NULL) {
877 DEBUG(DEBUG_CRIT,(__location__ " Out of memory error while allocating '%s'\n", vac_dbname));
878 talloc_free(tmp_ctx);
882 flags = ctdb_db->ctdb->valgrinding ? TDB_NOMMAP : 0;
883 flags |= TDB_DISALLOW_NESTING;
884 tdb = tdb_open(vac_dbname, 0,
886 O_RDWR|O_CREAT, 0600);
888 DEBUG(DEBUG_ERR,("Unable to open/create database %s using default interval. Errno : %s (%d)\n", vac_dbname, strerror(errno), errno));
889 talloc_free(tmp_ctx);
893 key.dptr = discard_const(ctdb_db->db_name);
894 key.dsize = strlen(ctdb_db->db_name);
896 value = tdb_fetch(tdb, key);
898 if (value.dptr != NULL) {
899 if (value.dsize == sizeof(struct vacuum_tuning_data)) {
900 struct vacuum_tuning_data *tptr = (struct vacuum_tuning_data *)value.dptr;
902 interval = tptr->new_interval;
904 if (interval < ctdb->tunable.vacuum_min_interval) {
905 interval = ctdb->tunable.vacuum_min_interval;
907 if (interval > ctdb->tunable.vacuum_max_interval) {
908 interval = ctdb->tunable.vacuum_max_interval;
915 talloc_free(tmp_ctx);
920 static int vacuum_child_destructor(struct ctdb_vacuum_child_context *child_ctx)
922 double l = timeval_elapsed(&child_ctx->start_time);
923 struct ctdb_db_context *ctdb_db = child_ctx->vacuum_handle->ctdb_db;
924 struct ctdb_context *ctdb = ctdb_db->ctdb;
926 DEBUG(DEBUG_INFO,("Vacuuming took %.3f seconds for database %s\n", l, ctdb_db->db_name));
928 if (child_ctx->child_pid != -1) {
929 kill(child_ctx->child_pid, SIGKILL);
932 DLIST_REMOVE(ctdb->vacuumers, child_ctx);
934 event_add_timed(ctdb->ev, child_ctx->vacuum_handle,
935 timeval_current_ofs(get_vacuum_interval(ctdb_db), 0),
936 ctdb_vacuum_event, child_ctx->vacuum_handle);
942 * this event is generated when a vacuum child process times out
944 static void vacuum_child_timeout(struct event_context *ev, struct timed_event *te,
945 struct timeval t, void *private_data)
947 struct ctdb_vacuum_child_context *child_ctx = talloc_get_type(private_data, struct ctdb_vacuum_child_context);
949 DEBUG(DEBUG_ERR,("Vacuuming child process timed out for db %s\n", child_ctx->vacuum_handle->ctdb_db->db_name));
951 child_ctx->status = VACUUM_TIMEOUT;
953 talloc_free(child_ctx);
958 * this event is generated when a vacuum child process has completed
960 static void vacuum_child_handler(struct event_context *ev, struct fd_event *fde,
961 uint16_t flags, void *private_data)
963 struct ctdb_vacuum_child_context *child_ctx = talloc_get_type(private_data, struct ctdb_vacuum_child_context);
967 DEBUG(DEBUG_INFO,("Vacuuming child process %d finished for db %s\n", child_ctx->child_pid, child_ctx->vacuum_handle->ctdb_db->db_name));
968 child_ctx->child_pid = -1;
970 ret = read(child_ctx->fd[0], &c, 1);
971 if (ret != 1 || c != 0) {
972 child_ctx->status = VACUUM_ERROR;
973 DEBUG(DEBUG_ERR, ("A vacuum child process failed with an error for database %s. ret=%d c=%d\n", child_ctx->vacuum_handle->ctdb_db->db_name, ret, c));
975 child_ctx->status = VACUUM_OK;
978 talloc_free(child_ctx);
982 * this event is called every time we need to start a new vacuum process
985 ctdb_vacuum_event(struct event_context *ev, struct timed_event *te,
986 struct timeval t, void *private_data)
988 struct ctdb_vacuum_handle *vacuum_handle = talloc_get_type(private_data, struct ctdb_vacuum_handle);
989 struct ctdb_db_context *ctdb_db = vacuum_handle->ctdb_db;
990 struct ctdb_context *ctdb = ctdb_db->ctdb;
991 struct ctdb_vacuum_child_context *child_ctx;
992 struct tevent_fd *fde;
995 /* we dont vacuum if we are in recovery mode, or db frozen */
996 if (ctdb->recovery_mode == CTDB_RECOVERY_ACTIVE ||
997 ctdb->freeze_mode[ctdb_db->priority] != CTDB_FREEZE_NONE) {
998 DEBUG(DEBUG_INFO, ("Not vacuuming %s (%s)\n", ctdb_db->db_name,
999 ctdb->recovery_mode == CTDB_RECOVERY_ACTIVE ? "in recovery"
1000 : ctdb->freeze_mode[ctdb_db->priority] == CTDB_FREEZE_PENDING
1003 event_add_timed(ctdb->ev, vacuum_handle, timeval_current_ofs(ctdb->tunable.vacuum_default_interval, 0), ctdb_vacuum_event, vacuum_handle);
1007 child_ctx = talloc(vacuum_handle, struct ctdb_vacuum_child_context);
1008 if (child_ctx == NULL) {
1009 DEBUG(DEBUG_CRIT, (__location__ " Failed to allocate child context for vacuuming of %s\n", ctdb_db->db_name));
1010 ctdb_fatal(ctdb, "Out of memory when crating vacuum child context. Shutting down\n");
1014 ret = pipe(child_ctx->fd);
1016 talloc_free(child_ctx);
1017 DEBUG(DEBUG_ERR, ("Failed to create pipe for vacuum child process.\n"));
1018 event_add_timed(ctdb->ev, vacuum_handle, timeval_current_ofs(ctdb->tunable.vacuum_default_interval, 0), ctdb_vacuum_event, vacuum_handle);
1022 child_ctx->child_pid = ctdb_fork(ctdb);
1023 if (child_ctx->child_pid == (pid_t)-1) {
1024 close(child_ctx->fd[0]);
1025 close(child_ctx->fd[1]);
1026 talloc_free(child_ctx);
1027 DEBUG(DEBUG_ERR, ("Failed to fork vacuum child process.\n"));
1028 event_add_timed(ctdb->ev, vacuum_handle, timeval_current_ofs(ctdb->tunable.vacuum_default_interval, 0), ctdb_vacuum_event, vacuum_handle);
1033 if (child_ctx->child_pid == 0) {
1035 close(child_ctx->fd[0]);
1037 DEBUG(DEBUG_INFO,("Vacuuming child process %d for db %s started\n", getpid(), ctdb_db->db_name));
1039 if (switch_from_server_to_client(ctdb, "vacuum-%s", ctdb_db->db_name) != 0) {
1040 DEBUG(DEBUG_CRIT, (__location__ "ERROR: failed to switch vacuum daemon into client mode. Shutting down.\n"));
1047 cc = ctdb_vacuum_and_repack_db(ctdb_db, child_ctx);
1049 write(child_ctx->fd[1], &cc, 1);
1053 set_close_on_exec(child_ctx->fd[0]);
1054 close(child_ctx->fd[1]);
1056 child_ctx->status = VACUUM_RUNNING;
1057 child_ctx->start_time = timeval_current();
1059 DLIST_ADD(ctdb->vacuumers, child_ctx);
1060 talloc_set_destructor(child_ctx, vacuum_child_destructor);
1063 * Clear the fastpath vacuuming list in the parent.
1065 talloc_free(ctdb_db->delete_queue);
1066 ctdb_db->delete_queue = trbt_create(ctdb_db, 0);
1067 if (ctdb_db->delete_queue == NULL) {
1068 /* fatal here? ... */
1069 ctdb_fatal(ctdb, "Out of memory when re-creating vacuum tree "
1070 "in parent context. Shutting down\n");
1073 event_add_timed(ctdb->ev, child_ctx,
1074 timeval_current_ofs(ctdb->tunable.vacuum_max_run_time, 0),
1075 vacuum_child_timeout, child_ctx);
1077 DEBUG(DEBUG_DEBUG, (__location__ " Created PIPE FD:%d to child vacuum process\n", child_ctx->fd[0]));
1079 fde = event_add_fd(ctdb->ev, child_ctx, child_ctx->fd[0],
1080 EVENT_FD_READ, vacuum_child_handler, child_ctx);
1081 tevent_fd_set_auto_close(fde);
1083 vacuum_handle->child_ctx = child_ctx;
1084 child_ctx->vacuum_handle = vacuum_handle;
1087 void ctdb_stop_vacuuming(struct ctdb_context *ctdb)
1089 /* Simply free them all. */
1090 while (ctdb->vacuumers) {
1091 DEBUG(DEBUG_INFO, ("Aborting vacuuming for %s (%i)\n",
1092 ctdb->vacuumers->vacuum_handle->ctdb_db->db_name,
1093 (int)ctdb->vacuumers->child_pid));
1094 /* vacuum_child_destructor kills it, removes from list */
1095 talloc_free(ctdb->vacuumers);
1099 /* this function initializes the vacuuming context for a database
1100 * starts the vacuuming events
1102 int ctdb_vacuum_init(struct ctdb_db_context *ctdb_db)
1104 if (ctdb_db->persistent != 0) {
1105 DEBUG(DEBUG_ERR,("Vacuuming is disabled for persistent database %s\n", ctdb_db->db_name));
1109 ctdb_db->vacuum_handle = talloc(ctdb_db, struct ctdb_vacuum_handle);
1110 CTDB_NO_MEMORY(ctdb_db->ctdb, ctdb_db->vacuum_handle);
1112 ctdb_db->vacuum_handle->ctdb_db = ctdb_db;
1114 event_add_timed(ctdb_db->ctdb->ev, ctdb_db->vacuum_handle,
1115 timeval_current_ofs(get_vacuum_interval(ctdb_db), 0),
1116 ctdb_vacuum_event, ctdb_db->vacuum_handle);