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ctdb-client: During transaction commit fetch seqnum locally
This avoids extra controls to the server. Signed-off-by: Amitay Isaacs <amitay@gmail.com> Reviewed-by: Martin Schwenke <martin@meltin.net>
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da03f5883e
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@ -1968,6 +1968,42 @@ int ctdb_transaction_delete_record(struct ctdb_transaction_handle *h,
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return ctdb_transaction_store_record(h, key, tdb_null);
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}
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static int ctdb_transaction_fetch_db_seqnum(struct ctdb_transaction_handle *h,
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uint64_t *seqnum)
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{
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const char *keyname = CTDB_DB_SEQNUM_KEY;
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TDB_DATA key, data;
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struct ctdb_ltdb_header header;
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int ret;
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key.dptr = discard_const(keyname);
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key.dsize = strlen(keyname) + 1;
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ret = ctdb_ltdb_fetch(h->db, key, &header, h, &data);
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if (ret != 0) {
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DEBUG(DEBUG_ERR,
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("transaction_commit: %s seqnum fetch failed, ret=%d\n",
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h->db->db_name, ret));
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return ret;
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}
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if (data.dsize == 0) {
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/* initial data */
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*seqnum = 0;
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return 0;
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}
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if (data.dsize != sizeof(uint64_t)) {
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talloc_free(data.dptr);
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return EINVAL;
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}
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*seqnum = *(uint64_t *)data.dptr;
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talloc_free(data.dptr);
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return 0;
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}
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static int ctdb_transaction_store_db_seqnum(struct ctdb_transaction_handle *h,
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uint64_t seqnum)
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{
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@ -1989,10 +2025,8 @@ struct ctdb_transaction_commit_state {
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uint64_t seqnum;
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};
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static void ctdb_transaction_commit_seqnum_done(struct tevent_req *subreq);
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static void ctdb_transaction_commit_try(struct tevent_req *subreq);
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static void ctdb_transaction_commit_done(struct tevent_req *subreq);
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static void ctdb_transaction_commit_seqnum2_done(struct tevent_req *subreq);
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struct tevent_req *ctdb_transaction_commit_send(
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TALLOC_CTX *mem_ctx,
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@ -2001,7 +2035,7 @@ struct tevent_req *ctdb_transaction_commit_send(
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{
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struct tevent_req *req, *subreq;
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struct ctdb_transaction_commit_state *state;
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struct ctdb_req_control request;
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int ret;
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req = tevent_req_create(mem_ctx, &state,
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struct ctdb_transaction_commit_state);
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@ -2012,55 +2046,27 @@ struct tevent_req *ctdb_transaction_commit_send(
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state->ev = ev;
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state->h = h;
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ctdb_req_control_get_db_seqnum(&request, h->db->db_id);
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subreq = ctdb_client_control_send(state, ev, h->client,
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h->client->pnn,
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tevent_timeval_zero(), &request);
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ret = ctdb_transaction_fetch_db_seqnum(h, &state->seqnum);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return tevent_req_post(req, ev);
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}
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ret = ctdb_transaction_store_db_seqnum(h, state->seqnum+1);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return tevent_req_post(req, ev);
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}
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subreq = ctdb_recovery_wait_send(state, ev, h->client);
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if (tevent_req_nomem(subreq, req)) {
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return tevent_req_post(req, ev);
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}
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tevent_req_set_callback(subreq, ctdb_transaction_commit_seqnum_done,
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req);
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tevent_req_set_callback(subreq, ctdb_transaction_commit_try, req);
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return req;
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}
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static void ctdb_transaction_commit_seqnum_done(struct tevent_req *subreq)
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{
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struct tevent_req *req = tevent_req_callback_data(
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subreq, struct tevent_req);
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struct ctdb_transaction_commit_state *state = tevent_req_data(
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req, struct ctdb_transaction_commit_state);
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struct ctdb_reply_control *reply;
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int ret;
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bool status;
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status = ctdb_client_control_recv(subreq, &ret, state, &reply);
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TALLOC_FREE(subreq);
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if (! status) {
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tevent_req_error(req, ret);
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return;
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}
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ret = ctdb_reply_control_get_db_seqnum(reply, &state->seqnum);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return;
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}
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ret = ctdb_transaction_store_db_seqnum(state->h, state->seqnum+1);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return;
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}
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subreq = ctdb_recovery_wait_send(state, state->ev, state->h->client);
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if (tevent_req_nomem(subreq, req)) {
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return;
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}
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tevent_req_set_callback(subreq, ctdb_transaction_commit_try, req);
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}
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static void ctdb_transaction_commit_try(struct tevent_req *subreq)
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{
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struct tevent_req *req = tevent_req_callback_data(
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@ -2094,8 +2100,9 @@ static void ctdb_transaction_commit_done(struct tevent_req *subreq)
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subreq, struct tevent_req);
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struct ctdb_transaction_commit_state *state = tevent_req_data(
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req, struct ctdb_transaction_commit_state);
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struct ctdb_transaction_handle *h = state->h;
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struct ctdb_reply_control *reply;
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struct ctdb_req_control request;
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uint64_t seqnum;
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int ret;
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bool status;
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@ -2109,8 +2116,7 @@ static void ctdb_transaction_commit_done(struct tevent_req *subreq)
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ret = ctdb_reply_control_trans3_commit(reply);
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if (ret < 0) {
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/* Control failed due to recovery */
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subreq = ctdb_recovery_wait_send(state, state->ev,
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state->h->client);
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subreq = ctdb_recovery_wait_send(state, state->ev, h->client);
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if (tevent_req_nomem(subreq, req)) {
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return;
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}
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@ -2119,44 +2125,15 @@ static void ctdb_transaction_commit_done(struct tevent_req *subreq)
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return;
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}
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ctdb_req_control_get_db_seqnum(&request, state->h->db->db_id);
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subreq = ctdb_client_control_send(state, state->ev, state->h->client,
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state->h->client->pnn,
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tevent_timeval_zero(), &request);
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if (tevent_req_nomem(subreq, req)) {
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return;
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}
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tevent_req_set_callback(subreq, ctdb_transaction_commit_seqnum2_done,
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req);
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}
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static void ctdb_transaction_commit_seqnum2_done(struct tevent_req *subreq)
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{
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struct tevent_req *req = tevent_req_callback_data(
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subreq, struct tevent_req);
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struct ctdb_transaction_commit_state *state = tevent_req_data(
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req, struct ctdb_transaction_commit_state);
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struct ctdb_reply_control *reply;
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uint64_t seqnum;
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int ret;
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bool status;
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status = ctdb_client_control_recv(subreq, &ret, state, &reply);
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TALLOC_FREE(subreq);
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if (! status) {
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tevent_req_error(req, ret);
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return;
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}
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ret = ctdb_reply_control_get_db_seqnum(reply, &seqnum);
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ret = ctdb_transaction_fetch_db_seqnum(h, &seqnum);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return;
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}
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if (seqnum == state->seqnum) {
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subreq = ctdb_recovery_wait_send(state, state->ev,
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state->h->client);
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/* try again */
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subreq = ctdb_recovery_wait_send(state, state->ev, h->client);
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if (tevent_req_nomem(subreq, req)) {
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return;
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}
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