vlink::BagWriter::Config结构体 参考

Recording behaviour, split policy and resource budgets. 更多...

#include <bag_writer.h>

vlink::BagWriter::Config 的协作图:

Public 成员函数
	Config ()

Public 属性
std::string	tag_name
	Optional tag stored in the bag header. 更多...
CompressType	compress {CompressType::kCompressNone}
	Compression codec selector. 更多...
bool	wal_mode {false}
	Enable SQLite WAL for crash resilience. 更多...
bool	enable_limit {false}
	When true, evict oldest rows at the row/byte limit. 更多...
bool	split_name_by_time {false}
	Append a timestamp suffix to split filenames. 更多...
bool	sync_mode {false}
	Disable periodic cache-flush timer for VDB writes. 更多...
bool	optimize_on_exit {false}
	Run VACUUM/OPTIMIZE while closing the file. 更多...
int64_t	max_row_count {5'000'000'000LL}
	SQLite row cap; either evicts or fails new writes. 更多...
int64_t	max_bytes_size {1024LL * 1024LL * 1024LL * 512LL}
	SQLite byte cap; either evicts or fails new writes. 更多...
int64_t	split_by_size {1024LL * 1024LL * 1024LL * 1LL}
	Split threshold in bytes (0 disables). 更多...
int64_t	split_by_time {0}
	Split interval in milliseconds (0 disables). 更多...
int64_t	begin_time {0}
	Anchor (ms) used by time-based splits. 更多...
int64_t	cache_size {1024LL * 1024LL * 4}
	VDB commit chunk / MCAP chunk size in bytes. 更多...
int64_t	compress_start_size {128}
	Minimum payload size eligible for compression. 更多...
int64_t	compress_level {3}
	Codec-specific compression level. 更多...
int64_t	max_task_depth {20000}
	Maximum pending writes in the loop queue. 更多...
int64_t	max_memory_size {1024LL * 1024LL * 1024LL * 2LL}
	Maximum in-memory cache size in bytes. 更多...
int64_t	start_timestamp {0}
	Override for the wall-clock start timestamp (ms). 更多...
std::unordered_set< std::string >	ignore_compress_urls
	URLs whose payloads must never be compressed. 更多...

详细描述

Recording behaviour, split policy and resource budgets.

Sizes are expressed in bytes and durations in milliseconds unless explicitly stated.

构造及析构函数说明

Config()

vlink::BagWriter::Config::Config ( )

inline

类成员变量说明

begin_time

int64_t vlink::BagWriter::Config::begin_time {0}

Anchor (ms) used by time-based splits.

cache_size

int64_t vlink::BagWriter::Config::cache_size {1024LL * 1024LL * 4}

VDB commit chunk / MCAP chunk size in bytes.

compress

CompressType vlink::BagWriter::Config::compress {CompressType::kCompressNone}

Compression codec selector.

compress_level

int64_t vlink::BagWriter::Config::compress_level {3}

Codec-specific compression level.

compress_start_size

int64_t vlink::BagWriter::Config::compress_start_size {128}

Minimum payload size eligible for compression.

enable_limit

bool vlink::BagWriter::Config::enable_limit {false}

When true, evict oldest rows at the row/byte limit.

ignore_compress_urls

std::unordered_set<std::string> vlink::BagWriter::Config::ignore_compress_urls

URLs whose payloads must never be compressed.

max_bytes_size

int64_t vlink::BagWriter::Config::max_bytes_size {1024LL * 1024LL * 1024LL * 512LL}

SQLite byte cap; either evicts or fails new writes.

max_memory_size

int64_t vlink::BagWriter::Config::max_memory_size {1024LL * 1024LL * 1024LL * 2LL}

Maximum in-memory cache size in bytes.

max_row_count

int64_t vlink::BagWriter::Config::max_row_count {5'000'000'000LL}

SQLite row cap; either evicts or fails new writes.

max_task_depth

int64_t vlink::BagWriter::Config::max_task_depth {20000}

Maximum pending writes in the loop queue.

optimize_on_exit

bool vlink::BagWriter::Config::optimize_on_exit {false}

Run VACUUM/OPTIMIZE while closing the file.

split_by_size

int64_t vlink::BagWriter::Config::split_by_size {1024LL * 1024LL * 1024LL * 1LL}

Split threshold in bytes (0 disables).

split_by_time

int64_t vlink::BagWriter::Config::split_by_time {0}

Split interval in milliseconds (0 disables).

split_name_by_time

bool vlink::BagWriter::Config::split_name_by_time {false}

Append a timestamp suffix to split filenames.

start_timestamp

int64_t vlink::BagWriter::Config::start_timestamp {0}

Override for the wall-clock start timestamp (ms).

sync_mode

bool vlink::BagWriter::Config::sync_mode {false}

Disable periodic cache-flush timer for VDB writes.

tag_name

std::string vlink::BagWriter::Config::tag_name

Optional tag stored in the bag header.

wal_mode

bool vlink::BagWriter::Config::wal_mode {false}

Enable SQLite WAL for crash resilience.

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该结构体的文档由以下文件生成:

• include/vlink/extension/bag_writer.h