The store component of Thanos implements the Store API on top of historical data in an object storage bucket. It acts primarily as an API gateway and therefore does not need significant amounts of local disk space. It joins a Thanos cluster on startup and advertises the data it can access. It keeps a small amount of information about all remote blocks on local disk and keeps it in sync with the bucket. This data is generally safe to delete across restarts at the cost of increased startup times.
$ thanos store \ --data-dir "/local/state/data/dir" \ --objstore.config-file "bucket.yml"
The content of
type: GCS config: bucket: example-bucket
In general about 1MB of local disk space is required per TSDB block stored in the object storage bucket.
usage: thanos store [<flags>] store node giving access to blocks in a bucket provider. Now supported GCS, S3, Azure, Swift and Tencent COS. 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. Possible options: logfmt or json. --tracing.config-file=<file-path> Path to YAML file with tracing configuration. See format details: https://thanos.io/tracing.md/#configuration --tracing.config=<content> Alternative to 'tracing.config-file' flag (lower priority). Content of YAML file with tracing configuration. See format details: https://thanos.io/tracing.md/#configuration --http-address="0.0.0.0:10902" Listen host:port for HTTP endpoints. --http-grace-period=2m Time to wait after an interrupt received for HTTP Server. --grpc-address="0.0.0.0:10901" Listen ip:port address for gRPC endpoints (StoreAPI). Make sure this address is routable from other components. --grpc-grace-period=2m Time to wait after an interrupt received for GRPC Server. --grpc-server-tls-cert="" TLS Certificate for gRPC server, leave blank to disable TLS --grpc-server-tls-key="" TLS Key for the gRPC server, leave blank to disable TLS --grpc-server-tls-client-ca="" TLS CA to verify clients against. If no client CA is specified, there is no client verification on server side. (tls.NoClientCert) --data-dir="./data" Data directory in which to cache remote blocks. --index-cache-size=250MB Maximum size of items held in the in-memory index cache. Ignored if --index-cache.config or --index-cache.config-file option is specified. --index-cache.config-file=<file-path> Path to YAML file that contains index cache configuration. See format details: https://thanos.io/components/store.md/#index-cache --index-cache.config=<content> Alternative to 'index-cache.config-file' flag (lower priority). Content of YAML file that contains index cache configuration. See format details: https://thanos.io/components/store.md/#index-cache --chunk-pool-size=2GB Maximum size of concurrently allocatable bytes reserved strictly to reuse for chunks in memory. --store.grpc.series-sample-limit=0 Maximum amount of samples returned via a single Series call. 0 means no limit. NOTE: For efficiency we take 120 as the number of samples in chunk (it cannot be bigger than that), so the actual number of samples might be lower, even though the maximum could be hit. --store.grpc.series-max-concurrency=20 Maximum number of concurrent Series calls. --objstore.config-file=<file-path> Path to YAML file that contains object store configuration. See format details: https://thanos.io/storage.md/#configuration --objstore.config=<content> Alternative to 'objstore.config-file' flag (lower priority). Content of YAML file that contains object store configuration. See format details: https://thanos.io/storage.md/#configuration --sync-block-duration=3m Repeat interval for syncing the blocks between local and remote view. --block-sync-concurrency=20 Number of goroutines to use when constructing index-cache.json blocks from object storage. --min-time=0000-01-01T00:00:00Z Start of time range limit to serve. Thanos Store will serve only metrics, which happened later than this value. Option can be a constant time in RFC3339 format or time duration relative to current time, such as -1d or 2h45m. Valid duration units are ms, s, m, h, d, w, y. --max-time=9999-12-31T23:59:59Z End of time range limit to serve. Thanos Store will serve only blocks, which happened eariler than this value. Option can be a constant time in RFC3339 format or time duration relative to current time, such as -1d or 2h45m. Valid duration units are ms, s, m, h, d, w, y. --selector.relabel-config-file=<file-path> Path to YAML file that contains relabeling configuration that allows selecting blocks. It follows native Prometheus relabel-config syntax. See format details: https://prometheus.io/docs/prometheus/latest/configuration/configuration/#relabel_config --selector.relabel-config=<content> Alternative to 'selector.relabel-config-file' flag (lower priority). Content of YAML file that contains relabeling configuration that allows selecting blocks. It follows native Prometheus relabel-config syntax. See format details: https://prometheus.io/docs/prometheus/latest/configuration/configuration/#relabel_config --consistency-delay=30m Minimum age of all blocks before they are being read. --ignore-deletion-marks-delay=24h Duration after which the blocks marked for deletion will be filtered out while fetching blocks. The idea of ignore-deletion-marks-delay is to ignore blocks that are marked for deletion with some delay. This ensures store can still serve blocks that are meant to be deleted but do not have a replacement yet. If delete-delay duration is provided to compactor or bucket verify component, it will upload deletion-mark.json file to mark after what duration the block should be deleted rather than deleting the block straight away. If delete-delay is non-zero for compactor or bucket verify component, ignore-deletion-marks-delay should be set to (delete-delay)/2 so that blocks marked for deletion are filtered out while fetching blocks before being deleted from bucket. Default is 24h, half of the default value for --delete-delay on compactor.
By default Thanos Store Gateway looks at all the data in Object Store and returns it based on query’s time range.
--max-time flags allows you to shard Thanos Store based on constant time or time duration relative to current time.
For example setting:
--max-time==-2w will make Thanos Store Gateway return metrics that fall within
now - 6 weeks up to
now - 2 weeks time range.
Constant time needs to be set in RFC3339 format. For example
Thanos Store Gateway might not get new blocks immediately, as Time partitioning is partly done in asynchronous block synchronization job, which is by default done every 3 minutes. Additionally some of the Object Store implementations provide eventual read-after-write consistency, which means that Thanos Store might not immediately get newly created & uploaded blocks anyway.
We recommend having overlapping time ranges with Thanos Sidecar and other Thanos Store gateways as this will improve your resiliency to failures.
Thanos Querier deals with overlapping time series by merging them together.
Filtering is done on a Chunk level, so Thanos Store might still return Samples which are outside of
/-/healthystarts as soon as initial setup completed.
/-/readystarts after all the bootstrapping completed (e.g initial index building) and ready to serve traffic.
NOTE: Metric endpoint starts immediately so, make sure you set up readiness probe on designated HTTP
Thanos Store Gateway supports an index cache to speed up postings and series lookups from TSDB blocks indexes. Two types of caches are supported:
in-memory index cache is enabled by default and its max size can be configured through the flag
in-memory index cache can also by configured using
--index-cache.config-file to reference to the configuration file or
--index-cache.config to put yaml config directly:
type: IN-MEMORY config: max_size: 0 max_item_size: 0
All the settings are optional:
max_size: overall maximum number of bytes cache can contain. The value should be specified with a bytes unit (ie.
max_item_size: maximum size of single item, in bytes. The value should be specified with a bytes unit (ie.
memcached index cache allows to use Memcached as cache backend. This cache type is configured using
--index-cache.config-file to reference to the configuration file or
--index-cache.config to put yaml config directly:
type: MEMCACHED config: addresses:  timeout: 0s max_idle_connections: 0 max_async_concurrency: 0 max_async_buffer_size: 0 max_item_size: 1MiB max_get_multi_concurrency: 0 max_get_multi_batch_size: 0 dns_provider_update_interval: 0s
The required settings are:
addresses: list of memcached addresses, that will get resolved with the DNS service discovery provider.
While the remaining settings are optional:
timeout: the socket read/write timeout.
max_idle_connections: maximum number of idle connections that will be maintained per address.
max_async_concurrency: maximum number of concurrent asynchronous operations can occur.
max_async_buffer_size: maximum number of enqueued asynchronous operations allowed.
max_get_multi_concurrency: maximum number of concurrent connections when fetching keys. If set to
0, the concurrency is unlimited.
max_get_multi_batch_size: maximum number of keys a single underlying operation should fetch. If more keys are specified, internally keys are splitted into multiple batches and fetched concurrently, honoring
max_get_multi_concurrency. If set to
0, the batch size is unlimited.
max_item_size: maximum size of an item to be stored in memcached. This option should be set to the same value of memcached
-Iflag (defaults to 1MB) in order to avoid wasting network round trips to store items larger than the max item size allowed in memcached. If set to
0, the item size is unlimited.
dns_provider_update_interval: the DNS discovery update interval.
In order to query series inside blocks from object storage, Store Gateway has to know certain initial info about each block such as:
In order to achieve so, on startup for each block
index-header is built from pieces of original block’s index and stored on disk.
index-header file is then mmaped and used by Store Gateway.
The following describes the format of the
index-header file found in each block store gateway local directory.
It is terminated by a table of contents which serves as an entry point into the index.
┌─────────────────────────────┬───────────────────────────────┐ │ magic(0xBAAAD792) <4b> │ version(1) <1 byte> │ ├─────────────────────────────┬───────────────────────────────┤ │ index version(2) <1 byte> │ index PostingOffsetTable <8b> │ ├─────────────────────────────┴───────────────────────────────┤ │ ┌─────────────────────────────────────────────────────────┐ │ │ │ Symbol Table (exact copy from original index) │ │ │ ├─────────────────────────────────────────────────────────┤ │ │ │ Posting Offset Table (exact copy from index) │ │ │ ├─────────────────────────────────────────────────────────┤ │ │ │ TOC │ │ │ └─────────────────────────────────────────────────────────┘ │ └─────────────────────────────────────────────────────────────┘
When the index is written, an arbitrary number of padding bytes may be added between the lined out main sections above. When sequentially scanning through the file, any zero bytes after a section’s specified length must be skipped.
Most of the sections described below start with a
len field. It always specifies the number of bytes just before the trailing CRC32 checksum. The checksum is always calculated over those
The table of contents serves as an entry point to the entire index and points to various sections in the file. If a reference is zero, it indicates the respective section does not exist and empty results should be returned upon lookup.
┌─────────────────────────────────────────┐ │ ref(symbols) <8b> │ ├─────────────────────────────────────────┤ │ ref(postings offset table) <8b> │ ├─────────────────────────────────────────┤ │ CRC32 <4b> │ └─────────────────────────────────────────┘