Compact #

The compactor component of Thanos applies the compaction procedure of the Prometheus 2.0 storage engine to block data stored in object storage. It is generally not semantically concurrency safe and must be deployed as a singleton against a bucket.


$ thanos compact --data-dir /tmp/thanos-compact --objstore.config-file=bucket.yml

The content of bucket.yml:

type: GCS
  bucket: example-bucket

The compactor needs local disk space to store intermediate data for its processing. Generally, about 100GB are recommended for it to keep working as the compacted time ranges grow over time. On-disk data is safe to delete between restarts and should be the first attempt to get crash-looping compactors unstuck.

Deployment #

Flags #

usage: thanos compact [<flags>]

continuously compacts blocks in an object store bucket

  -h, --help               Show context-sensitive help (also try --help-long and
      --version            Show application version.
      --log.level=info     Log filtering level.
      --log.format=logfmt  Log format to use.
                           GCP project to send Google Cloud Trace tracings to.
                           If empty, tracing will be disabled.
                           How often we send traces (1/<sample-factor>). If 0 no
                           trace will be sent periodically, unless forced by
                           baggage item. See `pkg/tracing/tracing.go` for
                           Listen host:port for HTTP endpoints.
      --data-dir="./data"  Data directory in which to cache blocks and process
                           Path to YAML file that contains object store
                           Alternative to 'objstore.config-file' flag. Object
                           store configuration in YAML.
      --sync-delay=30m     Minimum age of fresh (non-compacted) blocks before
                           they are being processed.
                           How long to retain raw samples in bucket. 0d -
                           disables this retention
                           How long to retain samples of resolution 1 (5
                           minutes) in bucket. 0d - disables this retention
                           How long to retain samples of resolution 2 (1 hour)
                           in bucket. 0d - disables this retention
  -w, --wait               Do not exit after all compactions have been processed
                           and wait for new work.