io.questdb.cairo.mig.Mig614 Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of questdb Show documentation
QuestDB is high performance SQL time series database
There is a newer version: 8.2.1
/*******************************************************************************
 *     ___                  _   ____  ____
 *    / _ \ _   _  ___  ___| |_|  _ \| __ )
 *   | | | | | | |/ _ \/ __| __| | | |  _ \
 *   | |_| | |_| |  __/\__ \ |_| |_| | |_) |
 *    \__\_\\__,_|\___||___/\__|____/|____/
 *
 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 QuestDB
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/

package io.questdb.cairo.mig;

import io.questdb.cairo.CairoException;
import io.questdb.cairo.vm.api.MemoryMARW;
import io.questdb.log.Log;
import io.questdb.log.LogFactory;
import io.questdb.std.FilesFacade;
import io.questdb.std.MemoryTag;
import io.questdb.std.str.Path;

import static io.questdb.cairo.TableUtils.META_FILE_NAME;
import static io.questdb.cairo.TableUtils.TXN_FILE_NAME;

final class Mig614 {
    private static final Log LOG = LogFactory.getLog(EngineMigration.class);
    private static final long META_OFFSET_STRUCTURE_VERSION = 32;
    private static final long TX_OFFSET_STRUCT_VERSION = 40;

    private static void openFileSafe(MemoryMARW metaMem, FilesFacade ff, Path path, long readOffset) {
        long fileLen = ff.length(path.$());

        if (fileLen < 0) {
            throw CairoException.critical(ff.errno()).put("cannot read file length: ").put(path);
        }

        if (fileLen < readOffset + Long.BYTES) {
            throw CairoException.critical(0).put("File length ").put(fileLen).put(" is too small at ").put(path);
        }

        metaMem.of(
                ff,
                path.$(),
                ff.getPageSize(),
                fileLen,
                MemoryTag.NATIVE_MIG_MMAP
        );
    }

    static void migrate(MigrationContext migrationContext) {
        final FilesFacade ff = migrationContext.getFf();
        final Path path = migrationContext.getTablePath();
        final Path path2 = migrationContext.getTablePath2();

        try (MemoryMARW rwMemory = migrationContext.getRwMemory()) {
            path2.concat(TXN_FILE_NAME).$();
            openFileSafe(rwMemory, ff, path2, TX_OFFSET_STRUCT_VERSION);

            // Copy structure version from txn to meta.
            long structureVersion = rwMemory.getLong(TX_OFFSET_STRUCT_VERSION);
            path.concat(META_FILE_NAME).$();
            openFileSafe(rwMemory, ff, path, META_OFFSET_STRUCTURE_VERSION);

            LOG.advisory().$("copying structure version [version=").$(structureVersion)
                    .$(", migration=614, metadata=").$(path)
                    .I$();

            rwMemory.putLong(META_OFFSET_STRUCTURE_VERSION, structureVersion);
        }
    }
}