mirror of
https://gitee.com/milvus-io/milvus.git
synced 2024-12-01 11:29:48 +08:00
131 lines
3.8 KiB
Go
131 lines
3.8 KiB
Go
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under the License.
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package storage
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"strconv"
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"github.com/milvus-io/milvus/internal/kv"
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)
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// GetBinlogSize get size of a binlog file.
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// normal binlog file, error = nil;
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// key not exist, size = 0, error = nil;
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// key not in binlog format, size = (a not accurate number), error != nil;
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// failed to read event reader, size = (a not accurate number), error != nil;
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func GetBinlogSize(kv kv.DataKV, key string) (int64, error) {
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total := int64(0)
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header := &baseEventHeader{}
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headerSize := binary.Size(header)
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startPos := binary.Size(MagicNumber)
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endPos := startPos + headerSize
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for {
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headerContent, err := kv.LoadPartial(key, int64(startPos), int64(endPos))
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if err != nil {
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// case 1: key not exist, total = 0;
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// case 2: all events have been read, total = (length of all events);
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// whatever the case is, the return value is reasonable.
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return total, nil
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}
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buffer := bytes.NewBuffer(headerContent)
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header, err := readEventHeader(buffer)
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if err != nil {
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// FIXME(dragondriver): should we return 0 here?
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return total, fmt.Errorf("failed to read event reader: %v", err)
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}
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if header.EventLength <= 0 || header.NextPosition < int32(endPos) {
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// key not in binlog format
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// FIXME(dragondriver): should we return 0 here?
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return total, fmt.Errorf("key not in binlog format")
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}
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total += int64(header.EventLength)
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// startPos = startPos + int(header.EventLength)
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// ||
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// \/
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startPos = int(header.NextPosition)
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endPos = startPos + headerSize
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}
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}
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// EstimateMemorySize get approximate memory size of a binlog file.
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// 1, key not exist, size = 0, error != nil;
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// 2, failed to read event header, size = 0, error != nil;
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// 3, invalid event length, size = 0, error != nil;
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// 4, failed to read descriptor event, size = 0, error != nil;
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// 5, original_size not in extra, size = 0, error != nil;
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// 6, original_size not in int format, size = 0, error != nil;
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// 7, normal binlog with original_size, return original_size, error = nil;
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func EstimateMemorySize(kv kv.DataKV, key string) (int64, error) {
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total := int64(0)
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header := &eventHeader{}
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headerSize := binary.Size(header)
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startPos := binary.Size(MagicNumber)
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endPos := startPos + headerSize
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// get header
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headerContent, err := kv.LoadPartial(key, int64(startPos), int64(endPos))
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if err != nil {
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return total, err
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}
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buffer := bytes.NewBuffer(headerContent)
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header, err = readEventHeader(buffer)
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if err != nil {
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return total, err
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}
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if header.EventLength <= 0 {
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return total, fmt.Errorf("key %v not in binlog format", key)
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}
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desc := &descriptorEvent{}
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endPos = startPos + int(header.EventLength)
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descContent, err := kv.LoadPartial(key, int64(startPos), int64(endPos))
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if err != nil {
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return total, err
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}
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buffer = bytes.NewBuffer(descContent)
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desc, err = ReadDescriptorEvent(buffer)
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if err != nil {
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return total, err
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}
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sizeStr, ok := desc.Extras[originalSizeKey]
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if !ok {
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return total, fmt.Errorf("key %v not in extra information", originalSizeKey)
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}
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size, err := strconv.Atoi(fmt.Sprintf("%v", sizeStr))
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if err != nil {
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return total, fmt.Errorf("%v not in valid format, value: %v", originalSizeKey, sizeStr)
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}
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total = int64(size)
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return total, nil
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}
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