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Allow to get the latest sequence number when creating the backup #1987
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Original file line number | Diff line number | Diff line change |
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/* | ||
* Licensed to the Apache Software Foundation (ASF) under one | ||
* or more contributor license agreements. See the NOTICE file | ||
* distributed with this work for additional information | ||
* regarding copyright ownership. The ASF licenses this file | ||
* to you 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. | ||
* | ||
*/ | ||
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#include <config/config.h> | ||
#include <gtest/gtest.h> | ||
#include <status.h> | ||
#include <storage/storage.h> | ||
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#include <filesystem> | ||
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TEST(Storage, CreateBackup) { | ||
std::error_code ec; | ||
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Config config; | ||
config.db_dir = "test_backup_dir"; | ||
config.slot_id_encoded = false; | ||
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std::filesystem::remove_all(config.db_dir, ec); | ||
ASSERT_TRUE(!ec); | ||
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auto storage = std::make_unique<engine::Storage>(&config); | ||
auto s = storage->Open(); | ||
ASSERT_TRUE(s.IsOK()); | ||
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constexpr int cnt = 10; | ||
for (int i = 0; i < cnt; i++) { | ||
rocksdb::WriteBatch batch; | ||
batch.Put("k", "v"); | ||
ASSERT_TRUE(storage->Write(rocksdb::WriteOptions(), &batch).ok()); | ||
} | ||
uint64_t sequence_number = 0; | ||
s = storage->CreateBackup(&sequence_number); | ||
ASSERT_TRUE(s.IsOK()); | ||
ASSERT_EQ(cnt, sequence_number); | ||
// check if backup success without caring about the sequence number | ||
s = storage->CreateBackup(); | ||
ASSERT_TRUE(s.IsOK()); | ||
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std::filesystem::remove_all(config.db_dir, ec); | ||
ASSERT_TRUE(!ec); | ||
} |
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Just a question:
From rocksdb, seems this might a bit less than backup? Or I misunderstanding this?
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Maybe, I didn't investigate when it would be less than the DB.
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It was introduced here: facebook/rocksdb@3ffb3ba
Maybe we should notice user to pay-attention to that, replaying kv might not harm
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@mapleFU I have updated the comment to address this, please take a look again.
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I have confirmed the implementation, it is the latest sequence number while starting to create the checkpoint, so it should be less the current backup DB if has any writes during this process.
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Yeah I guess maybe it's not atomic between: