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| --- | ||
| title: TiDB Lightning Configuration | ||
| summary: CLI usage and sample configuration | ||
| category: reference | ||
| --- | ||
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| # TiDB Lightning Configuration | ||
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| ## Configuration files | ||
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| TiDB Lightning's global and task configurations have compatible structures. | ||
| Unless [Server mode](/reference/tools/tidb-lightning/web.md) is enabled, the same file is used for both parts of configuration. | ||
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| ### TiDB Lightning (Global) | ||
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| ```toml | ||
| ### tidb-lightning global configuration | ||
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| [lightning] | ||
| # the HTTP port for web interface and Prometheus metrics pulling (0 to disable) | ||
| status-addr = ':8289' | ||
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| # Toggle server mode and use of the web interface. | ||
| # See the corresponding section for details. | ||
| server-mode = false | ||
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| # Logging | ||
| level = "info" | ||
| file = "tidb-lightning.log" | ||
| max-size = 128 # MB | ||
| max-days = 28 | ||
| max-backups = 14 | ||
| ``` | ||
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| ### TiDB Lightning (Task) | ||
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| ```toml | ||
| ### tidb-lightning task configuration | ||
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| [lightning] | ||
| # Checks if the cluster satisfies the minimum requirement before starting. | ||
| #check-requirements = true | ||
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| # 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 | ||
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| # 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 = | ||
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| # 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 | ||
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| [checkpoint] | ||
| # Whether to enable checkpoints. | ||
| # While importing, Lightning records which tables have been imported, so | ||
| # even if Lightning or other component crashed, you could start from a known | ||
| # good state instead of redoing everything. | ||
| 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, 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 | ||
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| [tikv-importer] | ||
| # The listening address of tikv-importer. Change it to the actual address. | ||
| addr = "172.16.31.10:8287" | ||
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| [mydumper] | ||
| # Block size for file reading. Keep it longer than the longest string of | ||
| # the data source. | ||
| read-block-size = 65536 # Byte (default = 64 KB) | ||
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| # Minimum size (in terms of source data file) of each batch of import. | ||
| # TiDB Lightning splits a large table into multiple data engine files according to this size. | ||
| batch-size = 107_374_182_400 # Byte (default = 100 GB) | ||
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| # 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, 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 GB. | ||
| # 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 | ||
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| # mydumper local source data directory | ||
| data-source-dir = "/data/my_database" | ||
| # If no-schema is set to true, tidb-lightning assumes that the table skeletons | ||
| # already exist on the target TiDB cluster, and will not execute the `CREATE | ||
| # TABLE` statements | ||
| no-schema = false | ||
| # 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 Lightning | ||
| # will emit errors | ||
| # - gb18030: the schema files must be encoded as GB-18030, otherwise | ||
| # Lightning will emit errors | ||
| # - 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 | ||
| # note that the *data* files are always parsed as binary regardless of | ||
| # schema encoding. | ||
| character-set = "auto" | ||
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| # Configure how CSV files are parsed. | ||
| [mydumper.csv] | ||
| # Separator between fields, should be an ASCII character. | ||
| separator = ',' | ||
| # Quoting delimiter, can either be an ASCII character or empty string. | ||
| delimiter = '"' | ||
| # 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 (i.e. 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 | ||
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| [tidb] | ||
| # Configuration of any TiDB server from the cluster | ||
| host = "172.16.31.1" | ||
| port = 4000 | ||
| user = "root" | ||
| 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" | ||
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| # 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 | ||
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| # The default SQL mode used to parse and execute the SQL statements | ||
| #sql-mode = "STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION" | ||
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| # 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] | ||
| # Performs `ADMIN CHECKSUM TABLE <table>` for each table to verify data integrity. | ||
| checksum = true | ||
| # 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 | ||
| # Performs `ANALYZE TABLE <table>` for each table. | ||
| analyze = true | ||
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| # Configures the background periodic actions | ||
| # Supported units: h (hour), m (minute), s (second). | ||
| [cron] | ||
| # Duration between which 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" | ||
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| # Table filter options. See the corresponding section for details. | ||
| #[black-white-list] | ||
| # ... | ||
| ``` | ||
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| ### TiKV Importer | ||
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| ```toml | ||
| # TiKV Importer configuration file template | ||
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| # Log file | ||
| log-file = "tikv-importer.log" | ||
| # Log level: trace, debug, info, warn, error, off. | ||
| log-level = "info" | ||
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| [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 | ||
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| [metric] | ||
| # The Prometheus client push job name. | ||
| job = "tikv-importer" | ||
| # The Prometheus client push interval. | ||
| interval = "15s" | ||
| # The Prometheus Pushgateway address. | ||
| address = "" | ||
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| [rocksdb] | ||
| # The maximum number of concurrent background jobs. | ||
| max-background-jobs = 32 | ||
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| [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 | ||
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| # 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"] | ||
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| [rocksdb.writecf] | ||
| # (same as above) | ||
| compression-per-level = ["lz4", "no", "no", "no", "no", "no", "lz4"] | ||
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| [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 | ||
| ``` | ||
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| ## Command line parameters | ||
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| ### Usage of `tidb-lightning` | ||
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| | Parameter | Explanation | Overrides setting | | ||
| |----|----|----| | ||
| | --config *file* | Reads global configuration from *file*. If not specified, the default configuration would be used. | | | ||
| | -V | Prints program version | | | ||
| | -d *directory* | Directory of the data dump to read from | `mydumper.data-source-dir` | | ||
| | -L *level* | Log level: debug, info, warn, error, fatal (default = info) | `lightning.log-level` | | ||
| | --log-file *file* | Log file path | `lightning.log-file` | | ||
| | --status-addr *ip:port* | Listening address of the TiDB Lightning server | `lightning.status-port` | | ||
| | --importer *host:port* | Address of TiKV Importer | `tikv-importer.addr` | | ||
| | --pd-urls *host:port* | PD endpoint address | `tidb.pd-addr` | | ||
| | --tidb-host *host* | TiDB server host | `tidb.host` | | ||
| | --tidb-port *port* | TiDB server port (default = 4000) | `tidb.port` | | ||
| | --tidb-status *port* | TiDB status port (default = 10080) | `tidb.status-port` | | ||
| | --tidb-user *user* | User name to connect to TiDB | `tidb.user` | | ||
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| ## Usage of `tidb-lightning-ctl` | ||
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| All parameters of `tidb-lightning` can be used in `tidb-lightning-ctl`. | ||
| Additionally, the following parameter should be supplied to execute the command. | ||
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| | Parameter | Explanation | | ||
| |----|----| | ||
| | --compact | Performs a full compaction | | ||
| | --switch-mode *mode* | Switches every TiKV store to the given mode: normal, import | | ||
| | --import-engine *uuid* | Imports the closed engine file from TiKV Importer into the TiKV cluster | | ||
| | --cleanup-engine *uuid* | Deletes the engine file from TiKV Importer | | ||
| | --checkpoint-dump *folder* | Dumps current checkpoint as CSVs into the folder | | ||
| | --checkpoint-error-destroy *tablename* | Removes the checkpoint and drops the table if it caused error | | ||
| | --checkpoint-error-ignore *tablename* | Ignores any error recorded in the checkpoint involving the given table | | ||
| | --checkpoint-remove *tablename* | Unconditionally removes the checkpoint of the table | | ||
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| ## Usage of `tikv-importer` | ||
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| | | Parameter | Explanation | Overrides setting | | ||
| |----|----|----|----| | ||
| | -C | --config *file* | Reads configuration from *file*. If not specified, the default configuration would be used. | | | ||
| | -V | --version | Prints program version | | | ||
| | -A | --addr *ip:port* | Listening address of the TiKV Importer server | `server.addr` | | ||
| | | --import-dir *dir* | Stores engine files in this directory | `import.import-dir` | | ||
| | | --log-level *level* | Log level: trace, debug, info, warn, error, off | `log-level` | | ||
| | | --log-file *file* | Log file path | `log-file` | |
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