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
type: GCS config: 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.
usage: thanos compact [<flags>] continuously compacts blocks in an object store bucket Flags: -h, --help Show context-sensitive help (also try --help-long and --help-man). --version Show application version. --log.level=info Log filtering level. --log.format=logfmt Log format to use. --tracing.config-file=<tracing.config-yaml-path> Path to YAML file that contains tracing configuration. --tracing.config=<tracing.config-yaml> Alternative to 'tracing.config-file' flag. Tracing configuration in YAML. --http-address="0.0.0.0:10902" Listen host:port for HTTP endpoints. --data-dir="./data" Data directory in which to cache blocks and process compactions. --objstore.config-file=<bucket.config-yaml-path> Path to YAML file that contains object store configuration. --objstore.config=<bucket.config-yaml> Alternative to 'objstore.config-file' flag. Object store configuration in YAML. --consistency-delay=30m Minimum age of fresh (non-compacted) blocks before they are being processed. Malformed blocks older than the maximum of consistency-delay and 30m0s will be removed. --retention.resolution-raw=0d How long to retain raw samples in bucket. 0d - disables this retention --retention.resolution-5m=0d How long to retain samples of resolution 1 (5 minutes) in bucket. 0d - disables this retention --retention.resolution-1h=0d 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. --block-sync-concurrency=20 Number of goroutines to use when syncing block metadata from object storage. --compact.concurrency=1 Number of goroutines to use when compacting groups.