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https://github.com/scylladb/scylladb.git
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5b69d99bf8
When migrating schema tables from v2 to v3, mutations underlying table schema will change, and so will their digest. However, we want the digest to be the same on new nodes as on the old nodes, because schema exchange is not possible between the two nodes, so they must to request schema definitions from each other. The solution is to make the digest persistable, so that it sticks to given table schema, surviving both migration and node restarts. On migration from v2, the digest will be calculated from v2 mutations, so it will be the same on new and old nodes.
103 lines
3.9 KiB
C++
103 lines
3.9 KiB
C++
/*
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* Copyright 2015 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "schema_mutations.hh"
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#include "canonical_mutation.hh"
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#include "db/schema_tables.hh"
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#include "md5_hasher.hh"
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schema_mutations::schema_mutations(canonical_mutation columnfamilies,
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canonical_mutation columns,
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bool is_view,
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stdx::optional<canonical_mutation> indices,
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stdx::optional<canonical_mutation> dropped_columns,
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stdx::optional<canonical_mutation> scylla_tables)
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: _columnfamilies(columnfamilies.to_mutation(is_view ? db::schema_tables::views() : db::schema_tables::tables()))
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, _columns(columns.to_mutation(db::schema_tables::columns()))
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, _indices(indices ? stdx::optional<mutation>{indices.value().to_mutation(db::schema_tables::indexes())} : stdx::nullopt)
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, _dropped_columns(dropped_columns ? stdx::optional<mutation>{dropped_columns.value().to_mutation(db::schema_tables::dropped_columns())} : stdx::nullopt)
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, _scylla_tables(scylla_tables ? stdx::optional<mutation>{scylla_tables.value().to_mutation(db::schema_tables::scylla_tables())} : stdx::nullopt)
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{}
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void schema_mutations::copy_to(std::vector<mutation>& dst) const {
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dst.push_back(_columnfamilies);
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dst.push_back(_columns);
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if (_indices) {
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dst.push_back(_indices.value());
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}
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if (_dropped_columns) {
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dst.push_back(_dropped_columns.value());
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}
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if (_scylla_tables) {
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dst.push_back(_scylla_tables.value());
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}
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}
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table_schema_version schema_mutations::digest() const {
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if (_scylla_tables) {
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auto rs = query::result_set(*_scylla_tables);
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if (!rs.empty()) {
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auto&& row = rs.row(0);
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if (row.has("version")) {
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auto val = row.get<utils::UUID>("version");
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if (val) {
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return *val;
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}
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}
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}
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}
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md5_hasher h;
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db::schema_tables::feed_hash_for_schema_digest(h, _columnfamilies);
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db::schema_tables::feed_hash_for_schema_digest(h, _columns);
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if (_indices && !_indices.value().partition().empty()) {
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db::schema_tables::feed_hash_for_schema_digest(h, _indices.value());
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}
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if (_dropped_columns && !_dropped_columns.value().partition().empty()) {
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db::schema_tables::feed_hash_for_schema_digest(h, _dropped_columns.value());
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}
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if (_scylla_tables) {
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db::schema_tables::feed_hash_for_schema_digest(h, _scylla_tables.value());
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}
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return utils::UUID_gen::get_name_UUID(h.finalize());
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}
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bool schema_mutations::operator==(const schema_mutations& other) const {
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return _columnfamilies == other._columnfamilies
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&& _columns == other._columns
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&& _indices == other._indices
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&& _dropped_columns == other._dropped_columns
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&& _scylla_tables == other._scylla_tables
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;
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}
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bool schema_mutations::operator!=(const schema_mutations& other) const {
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return !(*this == other);
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}
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bool schema_mutations::live() const {
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return _columnfamilies.live_row_count() > 0 || _columns.live_row_count() > 0;
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}
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bool schema_mutations::is_view() const {
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return _columnfamilies.schema() == db::schema_tables::views();
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}
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