--- /dev/null
+/*
+ ctdb control tool - database vacuum
+
+ Copyright (C) Andrew Tridgell 2008
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "lib/events/events.h"
+#include "system/filesys.h"
+#include "system/network.h"
+#include "../include/ctdb.h"
+#include "../include/ctdb_private.h"
+#include "db_wrap.h"
+
+/* should be tunable */
+#define TIMELIMIT() timeval_current_ofs(10, 0)
+
+struct async_data {
+ uint32_t count;
+ uint32_t fail_count;
+};
+
+static void async_callback(struct ctdb_client_control_state *state)
+{
+ struct async_data *data = talloc_get_type(state->async.private_data, struct async_data);
+ int ret;
+ int32_t res;
+
+ /* one more node has responded with recmode data */
+ data->count--;
+
+ /* if we failed to push the db, then return an error and let
+ the main loop try again.
+ */
+ if (state->state != CTDB_CONTROL_DONE) {
+ data->fail_count++;
+ return;
+ }
+
+ state->async.fn = NULL;
+
+ ret = ctdb_control_recv(state->ctdb, state, data, NULL, &res, NULL);
+ if ((ret != 0) || (res != 0)) {
+ data->fail_count++;
+ }
+}
+
+static void async_add(struct async_data *data, struct ctdb_client_control_state *state)
+{
+ /* set up the callback functions */
+ state->async.fn = async_callback;
+ state->async.private_data = data;
+
+ /* one more control to wait for to complete */
+ data->count++;
+}
+
+
+/* wait for up to the maximum number of seconds allowed
+ or until all nodes we expect a response from has replied
+*/
+static int async_wait(struct ctdb_context *ctdb, struct async_data *data)
+{
+ while (data->count > 0) {
+ event_loop_once(ctdb->ev);
+ }
+ if (data->fail_count != 0) {
+ DEBUG(0,("Async wait failed - fail_count=%u\n", data->fail_count));
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ perform a simple control on nodes in the vnn map except ourselves.
+ The control cannot return data
+ */
+static int async_control_on_vnnmap(struct ctdb_context *ctdb, enum ctdb_controls opcode,
+ TDB_DATA data)
+{
+ struct async_data *async_data;
+ struct ctdb_client_control_state *state;
+ int j;
+ struct timeval timeout = TIMELIMIT();
+
+ async_data = talloc_zero(ctdb, struct async_data);
+ CTDB_NO_MEMORY_FATAL(ctdb, async_data);
+
+ /* loop over all active nodes and send an async control to each of them */
+ for (j=0; j<ctdb->vnn_map->size; j++) {
+ uint32_t pnn = ctdb->vnn_map->map[j];
+ if (pnn == ctdb->pnn) {
+ continue;
+ }
+ state = ctdb_control_send(ctdb, pnn, 0, opcode,
+ 0, data, async_data, NULL, &timeout, NULL);
+ if (state == NULL) {
+ DEBUG(0,(__location__ " Failed to call async control %u\n", (unsigned)opcode));
+ talloc_free(async_data);
+ return -1;
+ }
+
+ async_add(async_data, state);
+ }
+
+ if (async_wait(ctdb, async_data) != 0) {
+ talloc_free(async_data);
+ return -1;
+ }
+
+ talloc_free(async_data);
+ return 0;
+}
+
+
+/*
+ vacuum one record
+ */
+static int ctdb_vacuum_one(struct ctdb_context *ctdb, TDB_DATA key, struct ctdb_db_context *ctdb_db)
+{
+ TDB_DATA data;
+ struct ctdb_ltdb_header *hdr;
+ struct ctdb_rec_data *rec;
+ uint64_t rsn;
+
+ if (tdb_chainlock_nonblock(ctdb_db->ltdb->tdb, key) != 0) {
+ /* the chain is busy - come back later */
+ return 0;
+ }
+
+ data = tdb_fetch(ctdb_db->ltdb->tdb, key);
+ tdb_chainunlock(ctdb_db->ltdb->tdb, key);
+ if (data.dptr == NULL) {
+ return 0;
+ }
+ if (data.dsize != sizeof(struct ctdb_ltdb_header)) {
+ free(data.dptr);
+ return 0;
+ }
+
+
+ hdr = (struct ctdb_ltdb_header *)data.dptr;
+ rsn = hdr->rsn;
+
+ /* if we are not the lmaster and the dmaster then skip the record */
+ if (hdr->dmaster != ctdb->pnn ||
+ ctdb_lmaster(ctdb, &key) != ctdb->pnn) {
+ free(data.dptr);
+ return 0;
+ }
+
+ rec = ctdb_marshall_record(ctdb, ctdb_db->db_id, key, hdr, tdb_null);
+ free(data.dptr);
+ if (rec == NULL) {
+ /* try it again later */
+ return 0;
+ }
+
+ data.dptr = (void *)rec;
+ data.dsize = rec->length;
+
+ if (async_control_on_vnnmap(ctdb, CTDB_CONTROL_DELETE_RECORD, data) != 0) {
+ /* one or more nodes failed to delete a record - no problem! */
+ talloc_free(rec);
+ return 0;
+ }
+
+ talloc_free(rec);
+
+ /* its deleted on all other nodes - refetch, check and delete */
+ if (tdb_chainlock_nonblock(ctdb_db->ltdb->tdb, key) != 0) {
+ /* the chain is busy - come back later */
+ return 0;
+ }
+
+ data = tdb_fetch(ctdb_db->ltdb->tdb, key);
+ if (data.dptr == NULL) {
+ tdb_chainunlock(ctdb_db->ltdb->tdb, key);
+ return 0;
+ }
+ if (data.dsize != sizeof(struct ctdb_ltdb_header)) {
+ free(data.dptr);
+ tdb_chainunlock(ctdb_db->ltdb->tdb, key);
+ return 0;
+ }
+
+ hdr = (struct ctdb_ltdb_header *)data.dptr;
+
+ /* if we are not the lmaster and the dmaster then skip the record */
+ if (hdr->dmaster != ctdb->pnn ||
+ ctdb_lmaster(ctdb, &key) != ctdb->pnn ||
+ rsn != hdr->rsn) {
+ tdb_chainunlock(ctdb_db->ltdb->tdb, key);
+ free(data.dptr);
+ return 0;
+ }
+
+ tdb_delete(ctdb_db->ltdb->tdb, key);
+ tdb_chainunlock(ctdb_db->ltdb->tdb, key);
+ free(data.dptr);
+
+ return 0;
+}
+
+
+/*
+ vacuum records for which we are the lmaster
+ */
+static int ctdb_vacuum_local(struct ctdb_context *ctdb, struct ctdb_control_pulldb_reply *list,
+ struct ctdb_db_context *ctdb_db)
+{
+ struct ctdb_rec_data *r;
+ int i;
+
+ r = (struct ctdb_rec_data *)&list->data[0];
+
+ for (i=0;
+ i<list->count;
+ r = (struct ctdb_rec_data *)(r->length + (uint8_t *)r), i++) {
+ TDB_DATA key;
+ key.dptr = &r->data[0];
+ key.dsize = r->keylen;
+ if (ctdb_vacuum_one(ctdb, key, ctdb_db) != 0) {
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ a list of records to possibly delete
+ */
+struct vacuum_data {
+ uint32_t vacuum_limit;
+ struct ctdb_context *ctdb;
+ struct ctdb_control_pulldb_reply **list;
+ bool traverse_error;
+ uint32_t total;
+};
+
+/*
+ traverse function for vacuuming
+ */
+static int vacuum_traverse(struct tdb_context *tdb, TDB_DATA key, TDB_DATA data, void *private)
+{
+ struct vacuum_data *vdata = talloc_get_type(private, struct vacuum_data);
+ uint32_t lmaster;
+ struct ctdb_ltdb_header *hdr;
+ struct ctdb_rec_data *rec;
+ size_t old_size;
+
+ lmaster = ctdb_lmaster(vdata->ctdb, &key);
+ if (lmaster >= vdata->ctdb->vnn_map->size) {
+ return 0;
+ }
+
+ if (data.dsize != sizeof(struct ctdb_ltdb_header)) {
+ /* its not a deleted record */
+ return 0;
+ }
+
+ hdr = (struct ctdb_ltdb_header *)data.dptr;
+
+ if (hdr->dmaster != vdata->ctdb->pnn) {
+ return 0;
+ }
+
+
+ /* add the record to the blob ready to send to the nodes */
+ rec = ctdb_marshall_record(vdata->list[lmaster], 0, key, NULL, tdb_null);
+ if (rec == NULL) {
+ DEBUG(0,(__location__ " Out of memory\n"));
+ vdata->traverse_error = true;
+ return -1;
+ }
+ old_size = talloc_get_size(vdata->list[lmaster]);
+ vdata->list[lmaster] = talloc_realloc_size(NULL, vdata->list[lmaster],
+ old_size + rec->length);
+ if (vdata->list[lmaster] == NULL) {
+ DEBUG(0,(__location__ " Failed to expand\n"));
+ vdata->traverse_error = true;
+ return -1;
+ }
+ vdata->list[lmaster]->count++;
+ memcpy(old_size+(uint8_t *)vdata->list[lmaster], rec, rec->length);
+ talloc_free(rec);
+
+ vdata->total++;
+
+ /* don't gather too many records */
+ if (vdata->vacuum_limit != 0 &&
+ vdata->total == vdata->vacuum_limit) {
+ return -1;
+ }
+
+ return 0;
+}
+
+
+/* vacuum one database */
+static int ctdb_vacuum_db(struct ctdb_context *ctdb, uint32_t db_id, struct ctdb_node_map *map,
+ bool persistent, uint32_t vacuum_limit)
+{
+ struct ctdb_db_context *ctdb_db;
+ const char *name;
+ struct vacuum_data *vdata;
+ int i;
+
+ vdata = talloc_zero(ctdb, struct vacuum_data);
+ if (vdata == NULL) {
+ DEBUG(0,(__location__ " Out of memory\n"));
+ return -1;
+ }
+
+ vdata->ctdb = ctdb;
+ vdata->vacuum_limit = vacuum_limit;
+
+ if (ctdb_ctrl_getdbname(ctdb, TIMELIMIT(), CTDB_CURRENT_NODE, db_id, vdata, &name) != 0) {
+ DEBUG(0,(__location__ " Failed to get name of db 0x%x\n", db_id));
+ talloc_free(vdata);
+ return -1;
+ }
+
+ ctdb_db = ctdb_attach(ctdb, name, persistent);
+ if (ctdb_db == NULL) {
+ DEBUG(0,(__location__ " Failed to attach to database '%s'\n", name));
+ talloc_free(vdata);
+ return -1;
+ }
+
+ /* the list needs to be of length num_nodes */
+ vdata->list = talloc_array(vdata, struct ctdb_control_pulldb_reply *, ctdb->vnn_map->size);
+ if (vdata->list == NULL) {
+ DEBUG(0,(__location__ " Out of memory\n"));
+ talloc_free(vdata);
+ return -1;
+ }
+ for (i=0;i<ctdb->vnn_map->size;i++) {
+ vdata->list[i] = (struct ctdb_control_pulldb_reply *)
+ talloc_zero_size(vdata->list,
+ offsetof(struct ctdb_control_pulldb_reply, data));
+ if (vdata->list[i] == NULL) {
+ DEBUG(0,(__location__ " Out of memory\n"));
+ talloc_free(vdata);
+ return -1;
+ }
+ vdata->list[i]->db_id = db_id;
+ }
+
+ /* traverse, looking for records that might be able to be vacuumed */
+ if (tdb_traverse_read(ctdb_db->ltdb->tdb, vacuum_traverse, vdata) == -1 ||
+ vdata->traverse_error) {
+ DEBUG(0,(__location__ " Traverse error in vacuuming '%s'\n", name));
+ talloc_free(vdata);
+ return -1;
+ }
+
+
+ for (i=0;i<ctdb->vnn_map->size;i++) {
+ if (vdata->list[i]->count == 0) {
+ continue;
+ }
+
+ printf("Found %u records for lmaster %u\n", vdata->list[i]->count, i);
+
+ /* for records where we are not the lmaster, tell the lmaster to fetch the record */
+ if (ctdb->vnn_map->map[i] != ctdb->pnn) {
+ TDB_DATA data;
+ data.dsize = talloc_get_size(vdata->list[i]);
+ data.dptr = (void *)vdata->list[i];
+ if (ctdb_send_message(ctdb, ctdb->vnn_map->map[i], CTDB_SRVID_VACUUM_FETCH, data) != 0) {
+ DEBUG(0,(__location__ " Failed to send vacuum fetch message to %u\n",
+ ctdb->vnn_map->map[i]));
+ talloc_free(vdata);
+ return -1;
+ }
+ continue;
+ }
+
+ /* for records where we are the lmaster, we can try to delete them */
+ if (ctdb_vacuum_local(ctdb, vdata->list[i], ctdb_db) != 0) {
+ DEBUG(0,(__location__ " Deletion error in vacuuming '%s'\n", name));
+ talloc_free(vdata);
+ return -1;
+ }
+ }
+
+ /* this ensures we run our event queue */
+ ctdb_ctrl_getpnn(ctdb, TIMELIMIT(), CTDB_CURRENT_NODE);
+
+ talloc_free(vdata);
+
+ return 0;
+}
+
+
+/*
+ vacuum all our databases
+ */
+int ctdb_vacuum(struct ctdb_context *ctdb, int argc, const char **argv)
+{
+ struct ctdb_dbid_map *dbmap=NULL;
+ struct ctdb_node_map *nodemap=NULL;
+ int ret, i, pnn;
+ uint32_t vacuum_limit = 100;
+
+ if (argc > 0) {
+ vacuum_limit = atoi(argv[0]);
+ }
+
+ ret = ctdb_ctrl_getdbmap(ctdb, TIMELIMIT(), CTDB_CURRENT_NODE, ctdb, &dbmap);
+ if (ret != 0) {
+ DEBUG(0, ("Unable to get dbids from local node\n"));
+ return ret;
+ }
+
+ ret = ctdb_ctrl_getnodemap(ctdb, TIMELIMIT(), CTDB_CURRENT_NODE, ctdb, &nodemap);
+ if (ret != 0) {
+ DEBUG(0, ("Unable to get nodemap from local node\n"));
+ return ret;
+ }
+
+ ret = ctdb_ctrl_getvnnmap(ctdb, TIMELIMIT(), CTDB_CURRENT_NODE, ctdb, &ctdb->vnn_map);
+ if (ret != 0) {
+ DEBUG(0, ("Unable to get vnnmap from local node\n"));
+ return ret;
+ }
+
+ pnn = ctdb_ctrl_getpnn(ctdb, TIMELIMIT(), CTDB_CURRENT_NODE);
+ if (pnn == -1) {
+ DEBUG(0, ("Unable to get pnn from local node\n"));
+ return -1;
+ }
+ ctdb->pnn = pnn;
+
+ for (i=0;i<dbmap->num;i++) {
+ if (ctdb_vacuum_db(ctdb, dbmap->dbs[i].dbid, nodemap,
+ dbmap->dbs[i].persistent, vacuum_limit) != 0) {
+ DEBUG(0,("Failed to vacuum db 0x%x\n", dbmap->dbs[i].dbid));
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+struct traverse_state {
+ bool error;
+ struct tdb_context *dest_db;
+};
+
+/*
+ traverse function for repacking
+ */
+static int repack_traverse(struct tdb_context *tdb, TDB_DATA key, TDB_DATA data, void *private)
+{
+ struct traverse_state *state = (struct traverse_state *)private;
+ if (tdb_store(state->dest_db, key, data, TDB_INSERT) != 0) {
+ state->error = true;
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ repack a tdb
+ */
+static int ctdb_repack_tdb(struct tdb_context *tdb)
+{
+ struct tdb_context *tmp_db;
+ struct traverse_state state;
+
+ if (tdb_transaction_start(tdb) != 0) {
+ DEBUG(0,(__location__ " Failed to start transaction\n"));
+ return -1;
+ }
+
+ tmp_db = tdb_open("tmpdb", tdb_hash_size(tdb), TDB_INTERNAL, O_RDWR|O_CREAT, 0);
+ if (tmp_db == NULL) {
+ DEBUG(0,(__location__ " Failed to create tmp_db\n"));
+ tdb_transaction_cancel(tdb);
+ return -1;
+ }
+
+ state.error = false;
+ state.dest_db = tmp_db;
+
+ if (tdb_traverse_read(tdb, repack_traverse, &state) == -1) {
+ DEBUG(0,(__location__ " Failed to traverse copying out\n"));
+ tdb_transaction_cancel(tdb);
+ tdb_close(tmp_db);
+ return -1;
+ }
+
+ if (state.error) {
+ DEBUG(0,(__location__ " Error during traversal\n"));
+ tdb_transaction_cancel(tdb);
+ tdb_close(tmp_db);
+ return -1;
+ }
+
+ if (tdb_wipe_all(tdb) != 0) {
+ DEBUG(0,(__location__ " Failed to wipe database\n"));
+ tdb_transaction_cancel(tdb);
+ tdb_close(tmp_db);
+ return -1;
+ }
+
+ state.error = false;
+ state.dest_db = tdb;
+
+ if (tdb_traverse_read(tmp_db, repack_traverse, &state) == -1) {
+ DEBUG(0,(__location__ " Failed to traverse copying back\n"));
+ tdb_transaction_cancel(tdb);
+ tdb_close(tmp_db);
+ return -1;
+ }
+
+ if (state.error) {
+ DEBUG(0,(__location__ " Error during second traversal\n"));
+ tdb_transaction_cancel(tdb);
+ tdb_close(tmp_db);
+ return -1;
+ }
+
+ tdb_close(tmp_db);
+
+ if (tdb_transaction_commit(tdb) != 0) {
+ DEBUG(0,(__location__ " Failed to commit\n"));
+ return -1;
+ }
+
+ return 0;
+}
+
+
+/* repack one database */
+static int ctdb_repack_db(struct ctdb_context *ctdb, uint32_t db_id,
+ bool persistent, uint32_t repack_limit)
+{
+ struct ctdb_db_context *ctdb_db;
+ const char *name;
+ int size;
+
+ if (ctdb_ctrl_getdbname(ctdb, TIMELIMIT(), CTDB_CURRENT_NODE, db_id, ctdb, &name) != 0) {
+ DEBUG(0,(__location__ " Failed to get name of db 0x%x\n", db_id));
+ return -1;
+ }
+
+ ctdb_db = ctdb_attach(ctdb, name, persistent);
+ if (ctdb_db == NULL) {
+ DEBUG(0,(__location__ " Failed to attach to database '%s'\n", name));
+ return -1;
+ }
+
+ size = tdb_freelist_size(ctdb_db->ltdb->tdb);
+ if (size == -1) {
+ DEBUG(0,(__location__ " Failed to get freelist size for '%s'\n", name));
+ return -1;
+ }
+
+ if (size <= repack_limit) {
+ return 0;
+ }
+
+ DEBUG(0,("Repacking %s with %u freelist entries\n", name, size));
+
+ if (ctdb_repack_tdb(ctdb_db->ltdb->tdb) != 0) {
+ DEBUG(0,(__location__ " Failed to repack '%s'\n", name));
+ return -1;
+ }
+
+ return 0;
+}
+
+
+/*
+ repack all our databases
+ */
+int ctdb_repack(struct ctdb_context *ctdb, int argc, const char **argv)
+{
+ struct ctdb_dbid_map *dbmap=NULL;
+ int ret, i;
+ uint32_t repack_limit = 100;
+
+ if (argc > 0) {
+ repack_limit = atoi(argv[0]);
+ }
+
+ ret = ctdb_ctrl_getdbmap(ctdb, TIMELIMIT(), CTDB_CURRENT_NODE, ctdb, &dbmap);
+ if (ret != 0) {
+ DEBUG(0, ("Unable to get dbids from local node\n"));
+ return ret;
+ }
+
+ for (i=0;i<dbmap->num;i++) {
+ if (ctdb_repack_db(ctdb, dbmap->dbs[i].dbid,
+ dbmap->dbs[i].persistent, repack_limit) != 0) {
+ DEBUG(0,("Failed to repack db 0x%x\n", dbmap->dbs[i].dbid));
+ return -1;
+ }
+ }
+
+ return 0;
+}
git.samba.org / metze / ctdb / wip.git / commitdiff