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TiDB LightningConfiguration / コンフィグレーション

このドキュメントでは、 TiDB Lightningのグローバル構成、タスク構成、およびTiKVインポーター構成のサンプルを提供し、コマンドラインパラメーターの使用法について説明します。

Configuration / コンフィグレーションファイル

TiDB Lightningには、「グローバル」と「タスク」の2つの構成クラスがあり、互換性のある構造があります。それらの区別は、 サーバーモードが有効になっている場合にのみ発生します。サーバーモードが無効(デフォルト)の場合、 TiDB Lightningは1つのタスクのみを実行し、グローバル構成とタスク構成の両方に同じ構成ファイルが使用されます。

TiDB Lightning (グローバル)

### tidb-lightning global configuration

[lightning]
# The HTTP port for displaying the web interface, pulling Prometheus metrics, exposing debug data, and submitting import tasks (in server mode). Setting it to 0 disables the port.
status-addr = ':8289'

# Server mode. Defaults to false, which means an import task starts immediately after you execute the command.
# If this value is set to true, after you execute the command, TiDB Lightning waits until you submit an import task in the web interface.
# See the "TiDB Lightning Web Interface" section for details.
server-mode = false

# Logging
level = "info"
file = "tidb-lightning.log"
max-size = 128 # MB
max-days = 28
max-backups = 14

TiDB Lightning (タスク)

### tidb-lightning task configuration

[lightning]
# Checks whether the cluster satisfies the minimum requirement before starting.
#check-requirements = true

# The maximum number of engines to be opened concurrently.
# Each table is split into one "index engine" to store indices, and multiple
# "data engines" to store row data. These settings control the maximum
# concurrent number for each type of engines.
# These values affect the memory and disk usage of tikv-importer.
# The sum of these two values must not exceed the max-open-engines setting
# for tikv-importer.
index-concurrency = 2
table-concurrency = 6

# The concurrency number of data. It is set to the number of logical CPU
# cores by default. When deploying together with other components, you can
# set it to 75% of the size of logical CPU cores to limit the CPU usage.
#region-concurrency =

# The maximum I/O concurrency. Excessive I/O concurrency causes an increase in
# I/O latency because the disk's internal buffer is frequently refreshed,
# which causes the cache miss and slows down the read speed. Depending on the storage
# medium, this value might need to be adjusted for optimal performance.
io-concurrency = 5

# The maximum number of non-fatal errors to tolerate before stopping TiDB Lightning.
# Non-fatal errors are localized to a few rows, and ignoring those rows allows the import process to continue.
# Setting this to N means that TiDB Lightning will stop as soon as possible when the (N+1)-th error is encountered.
# The skipped rows will be inserted into tables inside the "task info" schema on the target TiDB, which can be configured below.
max-error = 0
# task-info-schema-name is the name of the schema or database that stores TiDB Lightning execution results.
# To disable error recording, set this to an empty string.
# task-info-schema-name = 'lightning_task_info'

# In parallel import mode, the schema name that stores the meta information for each TiDB Lightning instance in the target cluster. By default, the value is "lightning_metadata".
# Configure this parameter only if parallel import is enabled.
# **Note:**
# - The value set for this parameter must be the same for each TiDB Lightning instance that participates in the same parallel import; otherwise, the correctness of the imported data cannot be ensured.
# - If parallel import mode is enabled, make sure that the user used for import (for the tidb.user configuration) has permissions to create and access the databases corresponding to this configuration.
# - TiDB Lightning removes this schema after the import is completed. So do not use any existing schema name to configure this parameter.
meta-schema-name = "lightning_metadata"

[security]
# Specifies certificates and keys for TLS connections within the cluster.
# Public certificate of the CA. Leave empty to disable TLS.
# ca-path = "/path/to/ca.pem"
# Public certificate of this service.
# cert-path = "/path/to/lightning.pem"
# Private key of this service.
# key-path = "/path/to/lightning.key"

[checkpoint]
# Whether to enable checkpoints.
# While importing data, TiDB Lightning records which tables have been imported, so
# even if TiDB Lightning or another component crashes, you can start from a known
# good state instead of restarting from scratch.
enable = true
# The schema name (database name) to store the checkpoints.
schema = "tidb_lightning_checkpoint"
# Where to store the checkpoints.
#  - file:  store as a local file.
#  - mysql: store into a remote MySQL-compatible database
driver = "file"
# The data source name (DSN) indicating the location of the checkpoint storage.
# For the "file" driver, the DSN is a path. If the path is not specified, TiDB Lightning would
# default to "/tmp/CHECKPOINT_SCHEMA.pb".
# For the "mysql" driver, the DSN is a URL in the form of "USER:PASS@tcp(HOST:PORT)/".
# If the URL is not specified, the TiDB server from the [tidb] section is used to
# store the checkpoints. You should specify a different MySQL-compatible
# database server to reduce the load of the target TiDB cluster.
# dsn = "/tmp/tidb_lightning_checkpoint.pb"
# Whether to keep the checkpoints after all data are imported. If false, the
# checkpoints will be deleted. Keeping the checkpoints can aid debugging but
# will leak metadata about the data source.
# keep-after-success = false

[tikv-importer]
# "local": The default mode. It applies to large dataset import, for example, greater than 1 TiB. However, during the import, downstream TiDB is not available to provide services.
# "tidb": You can use this mode for small dataset import, for example, smaller than 1 TiB. During the import, downstream TiDB is available to provide services.
# backend = "local"
# Whether to allow importing data to tables with data. The default value is `false`.
# When you use parallel import mode, you must set it to `true`, because multiple TiDB Lightning instances are importing the same table at the same time.
# incremental-import = false

# The listening address of tikv-importer when backend is "importer". Change it to the actual address.
addr = "172.16.31.10:8287"
# Action to do when trying to insert a duplicated entry in the "tidb" backend.
#  - replace: use new entry to replace the existing entry
#  - ignore: keep the existing entry, and ignore the new entry
#  - error: report error and quit the program
# on-duplicate = "replace"
# Whether to detect and resolve duplicate records (unique key conflict) when the backend is 'local'.
# The following resolution algorithms are supported:
#  - record: only records duplicate records to the `lightning_task_info.conflict_error_v1` table on the target TiDB. Note that the
#    required version of the target TiKV is no earlier than v5.2.0; otherwise it falls back to 'none'.
#  - none: does not detect duplicate records, which has the best performance of the three algorithms, but might lead to
#    inconsistent data in the target TiDB.
#  - remove: records all duplicate records to the lightning_task_info database, like the 'record' algorithm. But it removes all duplicate records from the target table to ensure a consistent
#    state in the target TiDB.
# duplicate-resolution = 'none'
# The number of KV pairs sent in one request in the "local" backend.
# send-kv-pairs = 32768
# The directory of local KV sorting in the "local" backend. If the disk
# performance is low (such as in HDD), it is recommended to set the directory
# on a different disk from `data-source-dir` to improve import speed.
# sorted-kv-dir = ""
# The concurrency that TiKV writes KV data in the "local" backend.
# When the network transmission speed between TiDB Lightning and TiKV
# exceeds 10 Gigabit, you can increase this value accordingly.
# range-concurrency = 16

[mydumper]
# Block size for file reading. Keep it longer than the longest string of the data source.
read-block-size = "64KiB" # default value

# The engine file needs to be imported sequentially. Due to parallel processing,
# multiple data engines will be imported at nearly the same time, and this
# creates a queue and wastes resources. Therefore, TiDB Lightning slightly
# increases the size of the first few batches to properly distribute
# resources. The scale up factor is controlled by this parameter, which
# expresses the ratio of duration between the "import" and "write" steps
# with full concurrency. This can be calculated by using the ratio
# (import duration/write duration) of a single table of size around 1 GiB.
# The exact timing can be found in the log. If "import" is faster, the batch
# size variance is smaller, and a ratio of zero means a uniform batch size.
# This value should be in the range (0 <= batch-import-ratio < 1).
batch-import-ratio = 0.75

# Local source data directory or the URL of the external storage.
data-source-dir = "/data/my_database"

# The character set of the schema files, containing CREATE TABLE statements;
# only supports one of:
#  - utf8mb4: the schema files must be encoded as UTF-8; otherwise, an error is reported.
#  - gb18030: the schema files must be encoded as GB-18030; otherwise,
#             an error is reported
#  - auto:    (default) automatically detects whether the schema is UTF-8 or
#             GB-18030. An error is reported if the encoding is neither.
#  - binary:  do not try to decode the schema files
character-set = "auto"

# Specifies the character set of the source data file. Lightning converts the source file from the specified character set to UTF-8 encoding when importing.
# Currently, this configuration only specifies the character set of the CSV files with the following options supported:
# - utf8mb4: Indicates that the source data file uses UTF-8 encoding.
# - GB18030: Indicates that the source data file uses the GB-18030 encoding.
# - GBK: The source data file uses GBK encoding (GBK encoding is an extension of the GB-2312 character set, also known as Code Page 936).
# - binary: Indicates that Lightning does not convert the encoding (by default).
# If left blank, the default value "binary" is used, that is to say, Lightning does not convert the encoding.
# Note that Lightning does not predict about the character set of the source data file and only converts the source file and import the data based on this configuration.
# If the value of this configuration is not the same as the actual encoding of the source data file, a failed import, data loss or data disorder might appear.
data-character-set = "binary"
# Specifies the replacement character in case of incompatible characters during the character set conversion of the source data file.
# This configuration must not be duplicated with field separators, quote definers, and line breaks.
# The default value is "\uFFFD", which is the "error" Rune or Unicode replacement character in UTF-8 encoding.
# Changing the default value might result in potential degradation of parsing performance for the source data file.
data-invalid-char-replace = "\uFFFD"

# the input data in a "strict" format speeds up processing.
# "strict-format = true" requires that:
# in CSV, every value cannot contain literal new lines (U+000A and U+000D, or \r and \n) even
# when quoted, which means new lines are strictly used to separate rows.
# "Strict" format allows TiDB Lightning to quickly locate split positions of a large file for parallel processing.
# However, if the input data is not "strict", it may split a valid data in half and
# corrupt the result.
# The default value is false for safety instead of speed.
strict-format = false

# If strict-format is true, TiDB Lightning splits large CSV files into multiple chunks to process in
# parallel. max-region-size is the maximum size of each chunk after splitting.
# max-region-size = "256MiB" # default value

# Only import tables if these wildcard rules are matched. See the corresponding section for details.
filter = ['*.*', '!mysql.*', '!sys.*', '!INFORMATION_SCHEMA.*', '!PERFORMANCE_SCHEMA.*', '!METRICS_SCHEMA.*', '!INSPECTION_SCHEMA.*']

# Configures how CSV files are parsed.
[mydumper.csv]
# Separator between fields. Must not be empty.
separator = ','
# Quoting delimiter. Empty value means no quoting.
delimiter = '"'
# Line terminator. Empty value means both "\n" (LF) and "\r\n" (CRLF) are line terminators.
terminator = ''
# Whether the CSV files contain a header.
# If `header` is true, the first line will be skipped.
header = true
# Whether the CSV contains any NULL value.
# If `not-null` is true, all columns from CSV cannot be NULL.
not-null = false
# When `not-null` is false (that is, CSV can contain NULL),
# fields equal to this value will be treated as NULL.
null = '\N'
# Whether to interpret backslash escapes inside fields.
backslash-escape = true
# If a line ends with a separator, remove it.
trim-last-separator = false

# [[mydumper.files]]
# Expression used for parsing AWS Aurora parquet files
# pattern = '(?i)^(?:[^/]*/)*([a-z0-9_]+)\.([a-z0-9_]+)/(?:[^/]*/)*(?:[a-z0-9\-_.]+\.(parquet))$'
# schema = '$1'
# table = '$2'
# type = '$3'

[tidb]
# Configuration of any TiDB server from the cluster.
host = "172.16.31.1"
port = 4000
user = "root"
# Configure the password to connect to TiDB. The password can either be plaintext or Base64 encoded.
password = ""
# Table schema information is fetched from TiDB via this status-port.
status-port = 10080
# Address of any PD server from the cluster.
pd-addr = "172.16.31.4:2379"
# tidb-lightning imports TiDB as a library and generates some logs itself.
# This setting controls the log level of the TiDB library.
log-level = "error"

# Sets the TiDB session variable to speed up the Checksum and Analyze operations.
# See https://pingcap.com/docs/dev/reference/performance/statistics/#control-analyze-concurrency
# for the meaning of each setting
build-stats-concurrency = 20
distsql-scan-concurrency = 100
index-serial-scan-concurrency = 20
checksum-table-concurrency = 16

# The default SQL mode used to parse and execute the SQL statements.
sql-mode = "ONLY_FULL_GROUP_BY,NO_ENGINE_SUBSTITUTION"
# Sets maximum packet size allowed for SQL connections.
# Set this to 0 to automatically fetch the `max_allowed_packet` variable from server on every connection.
max-allowed-packet = 67_108_864

# Whether to use TLS for SQL connections. Valid values are:
#  * ""            - force TLS (same as "cluster") if [tidb.security] section is populated, otherwise same as "false"
#  * "false"       - disable TLS
#  * "cluster"     - force TLS and verify the server's certificate with the CA specified in the [tidb.security] section
#  * "skip-verify" - force TLS but do not verify the server's certificate (insecure!)
#  * "preferred"   - same as "skip-verify", but if the server does not support TLS, fallback to unencrypted connection
# tls = ""

# Specifies certificates and keys for TLS-enabled MySQL connections.
# Defaults to a copy of the [security] section.
# [tidb.security]
# Public certificate of the CA. Set to empty string to disable TLS for SQL.
# ca-path = "/path/to/ca.pem"
# Public certificate of this service. Default to copy of `security.cert-path`
# cert-path = "/path/to/lightning.pem"
# Private key of this service. Default to copy of `security.key-path`
# key-path = "/path/to/lightning.key"

# When data importing is complete, tidb-lightning can automatically perform
# the Checksum, Compact and Analyze operations. It is recommended to leave
# these as true in the production environment.
# The execution order: Checksum -> Analyze
[post-restore]
# Specifies whether to perform `ADMIN CHECKSUM TABLE <table>` for each table to verify data integrity after importing.
# The following options are available:
# - "required" (default value): Perform admin checksum. If checksum fails, TiDB Lightning will exit with failure.
# - "optional": Perform admin checksum. If checksum fails, TiDB Lightning will report a WARN log but ignore any error.
# - "off": Do not perform checksum.
# Note that since v4.0.8, the default value has changed from "true" to "required".
# For backward compatibility, bool values "true" and "false" are also allowed for this field.
# "true" is equivalent to "required" and "false" is equivalent to "off".
checksum = "required"
# Specifies whether to perform `ANALYZE TABLE <table>` for each table after checksum is done.
# Options available for this field are the same as `checksum`. However, the default value for this field is "optional".
analyze = "optional"

# If the value is set to `true`, a level-1 compaction is performed
# every time a table is imported.
# The default value is `false`.
level-1-compact = false

# If the value is set to `true`, a full compaction on the whole
# TiKV cluster is performed at the end of the import.
# The default value is `false`.
compact = false

# Configures the background periodic actions.
# Supported units: h (hour), m (minute), s (second).
[cron]
# Duration between which TiDB Lightning automatically refreshes the import mode
# status. Should be shorter than the corresponding TiKV setting.
switch-mode = "5m"
# Duration between which an import progress is printed to the log.
log-progress = "5m"

TiKVインポーター

# TiKV Importer configuration file template.

# Log file.
log-file = "tikv-importer.log"
# Log level: trace, debug, info, warn, error, off.
log-level = "info"

# Listening address of the status server. Prometheus can scrape metrics from this address.
status-server-address = "0.0.0.0:8286"

[server]
# The listening address of tikv-importer. tidb-lightning needs to connect to
# this address to write data.
addr = "0.0.0.0:8287"
# Size of the thread pool for the gRPC server.
grpc-concurrency = 16

[metric]
# These settings are relevant when using Prometheus Pushgateway. Normally you should let Prometheus
# to scrape metrics from the status-server-address.
# The Prometheus client push job name.
job = "tikv-importer"
# The Prometheus client push interval.
interval = "15s"
# The Prometheus Pushgateway address.
address = ""

[rocksdb]
# The maximum number of concurrent background jobs.
max-background-jobs = 32

[rocksdb.defaultcf]
# Amount of data to build up in memory before flushing data to the disk.
write-buffer-size = "1GB"
# The maximum number of write buffers that are built up in memory.
max-write-buffer-number = 8

# The compression algorithms used in different levels.
# The algorithm at level-0 is used to compress KV data.
# The algorithm at level-6 is used to compress SST files.
# The algorithms at level-1 to level-5 are unused for now.
compression-per-level = ["lz4", "no", "no", "no", "no", "no", "lz4"]

[rocksdb.writecf]
# (same as above)
compression-per-level = ["lz4", "no", "no", "no", "no", "no", "lz4"]

[security]
# The path for TLS certificates. Empty string means disabling secure connections.
# ca-path = ""
# cert-path = ""
# key-path = ""

[import]
# The directory to store engine files.
import-dir = "/mnt/ssd/data.import/"
# Number of threads to handle RPC requests.
num-threads = 16
# Number of concurrent import jobs.
num-import-jobs = 24
# Maximum duration to prepare Regions.
#max-prepare-duration = "5m"
# Split Regions into this size according to the importing data.
#region-split-size = "512MB"
# Stream channel window size. The stream will be blocked on channel full.
#stream-channel-window = 128
# Maximum number of open engines.
max-open-engines = 8
# Maximum upload speed (bytes per second) from Importer to TiKV.
# upload-speed-limit = "512MB"
# Minimum ratio of available space on the target store: `store_available_space`/`store_capacity`.
# Importer pauses uploading SST if the availability ratio of the target store is less than this
# value, to allow enough time for PD to balance Regions.
min-available-ratio = 0.05

コマンドラインパラメータ

tidb-lightningの使用法

パラメータ説明対応する設定
--configファイルファイルからグローバル構成を読み取ります。指定しない場合、デフォルトの構成が使用されます。
-Vプログラムバージョンを印刷します
-dディレクトリ読み取るディレクトリまたはデータダンプの外部ストレージURLmydumper.data-source-dir
-Lレベルログレベル:デバッグ、情報、警告、エラー、致命的(デフォルト=情報)lightning.log-level
-fルールテーブルフィルタールール (複数回指定可能)mydumper.filter
-バックエンドバックエンド配信バックエンドlocaltidb importertikv-importer.backend
--ログファイルファイルログファイルのパス。デフォルトでは/tmp/lightning.log.{timestamp}です。 '-'に設定すると、ログファイルがstdoutに出力されることを意味します。lightning.log-file
--status-addr ip:portTiDB Lightningサーバーのリスニングアドレスlightning.status-port
--importer host:portTiKVインポーターの住所tikv-importer.addr
--pd-urls host:portPDエンドポイントアドレスtidb.pd-addr
--tidb-ホストホストTiDBサーバーホストtidb.host
--tidb-portポートTiDBサーバーポート(デフォルト= 4000)tidb.port
--tidb-ステータスポートTiDBステータスポート(デフォルト= 10080)tidb.status-port
--tidb-ユーザーユーザーTiDBに接続するためのユーザー名tidb.user
--tidb-パスワードパスワードTiDBに接続するためのパスワード。パスワードは、プレーンテキストまたはBase64エンコードのいずれかです。tidb.password
--enable-checkpoint boolチェックポイントを有効にするかどうか(デフォルト= true)checkpoint.enable
-レベルを分析するインポート後にテーブルを分析します。使用可能な値は、「必須」、「オプション」(デフォルト値)、および「オフ」です。post-restore.analyze
-チェックサムレベルインポート後のチェックサムを比較します。使用可能な値は、「必須」(デフォルト値)、「オプション」、および「オフ」です。post-restore.checksum
--check-requirements bool開始する前にクラスタバージョンの互換性を確認してください(デフォルト= true)lightning.check-requirements
--caファイルTLS接続用のCA証明書パスsecurity.ca-path
--証明書ファイルTLS接続の証明書パスsecurity.cert-path
--キーファイルTLS接続用の秘密鍵パスsecurity.key-path
--サーバーモードサーバーモードでTiDB Lightningを起動しますlightning.server-mode

コマンドラインパラメーターと構成ファイルの対応する設定の両方が指定されている場合は、コマンドラインパラメーターが使用されます。たとえば、 ./tidb-lightning -L debug --config cfg.tomlを実行すると、 cfg.tomlの内容に関係なく、常にログレベルが「デバッグ」に設定されます。

tidb-lightning-ctl使用法

このツールは、次のいずれかのパラメータを指定してさまざまなアクションを実行できます。

パラメータ説明
- コンパクト完全な圧縮を実行します
--スイッチモードモードすべてのTiKVストアを指定されたモードに切り替えます:通常、インポート
--fetch-modeすべてのTiKVストアの現在のモードを出力します
--import-engine uuid閉じたエンジンファイルをTiKVインポーターからTiKVクラスタにインポートします
--cleanup-engine uuidTiKVインポーターからエンジンファイルを削除します
--checkpoint-dumpフォルダー現在のチェックポイントをCSVとしてフォルダにダンプします
--checkpoint-error-destroy tablenameチェックポイントを削除し、エラーが発生した場合はテーブルを削除します
--checkpoint-error-テーブル名を無視します指定されたテーブルに関連するチェックポイントに記録されたエラーを無視します
--チェックポイント-テーブル名を削除しますテーブルのチェックポイントを無条件に削除します

テーブル名は、形式`db`.`tbl`の修飾テーブル名(バッククォートを含む)、またはキーワード「all」のいずれかである必要があります。

さらに、上記のセクションで説明したtidb-lightningのすべてのパラメーターはtidb-lightning-ctlで有効です。

tikv-importer使用法

パラメータ説明対応する設定
-C、-configファイルファイルから構成を読み取ります。指定しない場合、デフォルトの構成が使用されます。
-V、-versionプログラムバージョンを印刷します
-A、-addr ip:portTiKVインポーターサーバーのリスニングアドレスserver.addr
--status-server ip:portステータスサーバーのリスニングアドレスstatus-server-address
--import-dir dirこのディレクトリにエンジンファイルを保存しますimport.import-dir
-ログレベルレベルログレベル:トレース、デバッグ、情報、警告、エラー、オフlog-level
--ログファイルファイルログファイルのパスlog-file