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TiDB-Lightning Monitoring
Learn about the monitor configuration and monitoring metrics of TiDB-Lightning.
reference
/docs/tools/lightning/monitor/

TiDB-Lightning Monitoring

Both tidb-lightning and tikv-importer supports metrics collection via Prometheus. This document introduces the monitor configuration and monitoring metrics of TiDB-Lightning.

Monitor configuration

  • If TiDB-Lightning is installed using TiDB-Ansible, simply add the servers to the [monitored_servers] section in the inventory.ini. Then the Prometheus server can collect their metrics.
  • If TiDB-Lightning is manually installed, follow the instructions below.

tikv-importer

tikv-importer v2.1 uses Pushgateway to deliver metrics. Configure tikv-importer.toml to recognize the Pushgateway with the following settings:

[metric]

# The Prometheus client push job name.
job = "tikv-importer"

# The Prometheus client push interval.
interval = "15s"

# The Prometheus Pushgateway address.
address = ""

tidb-lightning

The metrics of tidb-lightning can be gathered directly by Prometheus as long as it is discovered. You can set the metrics port in tidb-lightning.toml:

[lightning]
# HTTP port for debugging and Prometheus metrics pulling (0 to disable)
pprof-port = 8289

...

You need to configure Prometheus to make it discover the tidb-lightning server. For instance, you can directly add the server address to the scrape_configs section:

...
scrape_configs:
  - job_name: 'tidb-lightning'
    static_configs:
      - targets: ['192.168.20.10:8289']

Monitoring metrics

This section explains the monitoring metrics of tikv-importer and tidb-lightning.

tikv-importer

Metrics provided by tikv-importer are listed under the namespace tikv_import_*.

  • tikv_import_rpc_duration (Histogram)

    Bucketed histogram for the duration of an RPC action. Labels:

    • request: switch_mode/open_engine/write_engine/close_engine/import_engine/cleanup_engine/compact_cluster/upload/ingest/compact
    • result: ok/error

  • tikv_import_write_chunk_bytes (Histogram)

    Bucketed histogram for the uncompressed size of a block of KV pairs received from Lightning.

  • tikv_import_write_chunk_duration (Histogram)

    Bucketed histogram for the time needed to receive a block of KV pairs from Lightning.

  • tikv_import_upload_chunk_bytes (Histogram)

    Bucketed histogram for the compressed size of a chunk of SST file uploaded to TiKV.

  • tikv_import_upload_chunk_duration (Histogram)

    Bucketed histogram for the time needed to upload a chunk of SST file to TiKV.

  • tikv_import_range_delivery_duration (Histogram)

    Bucketed histogram for the time needed to deliver a range of KV pairs into a dispatch-job.

  • tikv_import_split_sst_duration (Histogram)

    Bucketed histogram for the time needed to split off a range from the engine file into a single SST file.

  • tikv_import_sst_delivery_duration (Histogram)

    Bucketed histogram for the time needed to deliver an SST file from a dispatch-job to an ImportSSTJob.

  • tikv_import_sst_recv_duration (Histogram)

    Bucketed histogram for the time needed to receive an SST file from a dispatch-job in an ImportSSTJob.

  • tikv_import_sst_upload_duration (Histogram)

    Bucketed histogram for the time needed to upload an SST file from an ImportSSTJob to a TiKV node.

  • tikv_import_sst_chunk_bytes (Histogram)

    Bucketed histogram for the compressed size of the SST file uploaded to a TiKV node.

  • tikv_import_sst_ingest_duration (Histogram)

    Bucketed histogram for the time needed to ingest an SST file into TiKV.

  • tikv_import_each_phase (Gauge)

    Indicates the running phase. Possible values are 1, meaning running inside the phase, and 0, meaning outside the phase. Labels:

    • phase: prepare/import

  • tikv_import_wait_store_available_count (Counter)

    Counts the number of times a TiKV node is found to have insufficient space when uploading SST files. Labels:

    • store_id: The TiKV store ID.

tidb-lightning

Metrics provided by tidb-lightning are listed under the namespace lightning_*.

  • lightning_importer_engine (Counter)

    Counts open and closed engine files. Labels:

    • type: open/closed

  • lightning_idle_workers (Gauge)

    Counts idle workers. Values should be less than the *-concurrency settings and are typically zero. Labels:

    • name: table/index/region/io/closed-engine

  • lightning_kv_encoder (Counter)

    Counts open and closed KV encoders. KV encoders are in-memory TiDB instances that convert SQL INSERT statements into KV pairs. The net values need to be bounded in a healthy situation. Labels:

    • type: open/closed

  • lightning_tables (Counter)

    Counts number of tables processed and their status. Labels:

    • state: pending/written/closed/imported/altered_auto_inc/checksum/analyzed/completed
    • result: success/failure

  • lightning_engines (Counter)

    Counts number of engine files processed and their status. Labels:

    • state: pending/written/closed/imported/completed
    • result: success/failure

  • lightning_chunks (Counter)

    Counts number of chunks processed and their status. Labels:

    • state: estimated/pending/running/finished/failed

  • lightning_import_seconds (Histogram)

    Bucketed histogram for the time needed to import a table.

  • lightning_row_read_bytes (Histogram)

    Bucketed histogram for the size of a single SQL row.

  • lightning_row_encode_seconds (Histogram)

    Bucketed histogram for the time needed to encode a single SQL row into KV pairs.

  • lightning_row_kv_deliver_seconds (Histogram)

    Bucketed histogram for the time needed to deliver a set of KV pairs corresponding to one single SQL row.

  • lightning_block_deliver_seconds (Histogram)

    Bucketed histogram for the time needed to deliver a block of KV pairs to Importer.

  • lightning_block_deliver_bytes (Histogram)

    Bucketed histogram for the uncompressed size of a block of KV pairs delivered to Importer.

  • lightning_chunk_parser_read_block_seconds (Histogram)

    Bucketed histogram for the time needed by the data file parser to read a block.

  • lightning_checksum_seconds (Histogram)

    Bucketed histogram for the time needed to compute the checksum of a table.

  • lightning_apply_worker_seconds (Histogram)

    Bucketed histogram for the time needed to acquire an idle worker. Labels:

    • name: table/index/region/io/closed-engine