Table of Contents
Store #
The thanos store command (also known as Store Gateway) 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 bucket.yml:
type: GCS
config:
bucket: ""
service_account: ""
use_grpc: false
grpc_conn_pool_size: 0
http_config:
idle_conn_timeout: 0s
response_header_timeout: 0s
insecure_skip_verify: false
tls_handshake_timeout: 0s
expect_continue_timeout: 0s
max_idle_conns: 0
max_idle_conns_per_host: 0
max_conns_per_host: 0
tls_config:
ca_file: ""
cert_file: ""
key_file: ""
server_name: ""
insecure_skip_verify: false
disable_compression: false
chunk_size_bytes: 0
max_retries: 0
prefix: ""
In general, an average of 6 MB of local disk space is required per TSDB block stored in the object storage bucket, but for high cardinality blocks with large label set it can even go up to 30MB and more. It is for the pre-computed index, which includes symbols and postings offsets as well as metadata JSON.
Flags #
usage: thanos store [<flags>]
Store node giving access to blocks in a bucket provider. Now supported GCS, S3,
Azure, Swift, Tencent COS and Aliyun OSS.
Flags:
--auto-gomemlimit.ratio=0.9
The ratio of reserved GOMEMLIMIT memory to the
detected maximum container or system memory.
--block-discovery-strategy="concurrent"
One of concurrent, recursive. When set to
concurrent, stores will concurrently issue
one call per directory to discover active
blocks in the bucket. The recursive strategy
iterates through all objects in the bucket,
recursively traversing into each directory.
This avoids N+1 calls at the expense of having
slower bucket iterations.
--block-meta-fetch-concurrency=32
Number of goroutines to use when fetching block
metadata from object storage.
--block-sync-concurrency=20
Number of goroutines to use when constructing
index-cache.json blocks from object storage.
Must be equal or greater than 1.
--bucket-web-label=BUCKET-WEB-LABEL
External block label to use as group title in
the bucket web UI
--cache-index-header Cache TSDB index-headers on disk to reduce
startup time. When set to true, Thanos Store
will download index headers from remote object
storage on startup and create a header file on
disk. Use --data-dir to set the directory in
which index headers will be downloaded.
--chunk-pool-size=2GB Maximum size of concurrently allocatable
bytes reserved strictly to reuse for chunks in
memory.
--consistency-delay=0s Minimum age of all blocks before they are
being read. Set it to safe value (e.g 30m) if
your object storage is eventually consistent.
GCS and S3 are (roughly) strongly consistent.
--data-dir="./data" Local data directory used for caching
purposes (index-header, in-mem cache items and
meta.jsons). If removed, no data will be lost,
just store will have to rebuild the cache.
NOTE: Putting raw blocks here will not
cause the store to read them. For such use
cases use Prometheus + sidecar. Ignored if
--no-cache-index-header option is specified.
--enable-auto-gomemlimit Enable go runtime to automatically limit memory
consumption.
--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-max-connection-age=60m
The grpc server max connection age. This
controls how often to re-establish connections
and redo TLS handshakes.
--grpc-server-tls-cert="" TLS Certificate for 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)
--grpc-server-tls-key="" TLS Key for the gRPC server, leave blank to
disable TLS
--grpc-server-tls-min-version="1.3"
TLS supported minimum version for gRPC server.
If no version is specified, it'll default to
1.3. Allowed values: ["1.0", "1.1", "1.2",
"1.3"]
-h, --help Show context-sensitive help (also try
--help-long and --help-man).
--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.
--http.config="" [EXPERIMENTAL] Path to the configuration file
that can enable TLS or authentication for all
HTTP endpoints.
--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.
--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=<content>
Alternative to 'index-cache.config-file'
flag (mutually exclusive). Content of
YAML file that contains index cache
configuration. See format details:
https://thanos.io/tip/components/store.md/#index-cache
--index-cache.config-file=<file-path>
Path to YAML file that contains index
cache configuration. See format details:
https://thanos.io/tip/components/store.md/#index-cache
--log.format=logfmt Log format to use. Possible options: logfmt or
json.
--log.level=info Log filtering level.
--max-time=9999-12-31T23:59:59Z
End of time range limit to serve. Thanos Store
will serve only blocks, which happened earlier
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.
--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.
--objstore.config=<content>
Alternative to 'objstore.config-file'
flag (mutually exclusive). Content of
YAML file that contains object store
configuration. See format details:
https://thanos.io/tip/thanos/storage.md/#configuration
--objstore.config-file=<file-path>
Path to YAML file that contains object
store configuration. See format details:
https://thanos.io/tip/thanos/storage.md/#configuration
--request.logging-config=<content>
Alternative to 'request.logging-config-file'
flag (mutually exclusive). Content
of YAML file with request logging
configuration. See format details:
https://thanos.io/tip/thanos/logging.md/#configuration
--request.logging-config-file=<file-path>
Path to YAML file with request logging
configuration. See format details:
https://thanos.io/tip/thanos/logging.md/#configuration
--selector.relabel-config=<content>
Alternative to 'selector.relabel-config-file'
flag (mutually exclusive). Content of YAML
file with relabeling configuration that allows
selecting blocks to act on based on their
external labels. It follows thanos sharding
relabel-config syntax. For format details see:
https://thanos.io/tip/thanos/sharding.md/#relabelling
--selector.relabel-config-file=<file-path>
Path to YAML file with relabeling
configuration that allows selecting blocks
to act on based on their external labels.
It follows thanos sharding relabel-config
syntax. For format details see:
https://thanos.io/tip/thanos/sharding.md/#relabelling
--store.enable-index-header-lazy-reader
If true, Store Gateway will lazy memory map
index-header only once the block is required by
a query.
--store.enable-lazy-expanded-postings
If true, Store Gateway will estimate postings
size and try to lazily expand postings if
it downloads less data than expanding all
postings.
--store.grpc.downloaded-bytes-limit=0
Maximum amount of downloaded (either
fetched or touched) bytes in a single
Series/LabelNames/LabelValues call. The Series
call fails if this limit is exceeded. 0 means
no limit.
--store.grpc.series-max-concurrency=20
Maximum number of concurrent Series calls.
--store.grpc.series-sample-limit=0
DEPRECATED: use store.limits.request-samples.
--store.grpc.touched-series-limit=0
DEPRECATED: use store.limits.request-series.
--store.index-header-lazy-download-strategy=eager
Strategy of how to download index headers
lazily. Supported values: eager, lazy.
If eager, always download index header during
initial load. If lazy, download index header
during query time.
--store.limits.request-samples=0
The maximum samples allowed for a single
Series request, The Series call fails if
this limit is exceeded. 0 means no limit.
NOTE: For efficiency the limit is internally
implemented as 'chunks limit' considering each
chunk contains a maximum of 120 samples.
--store.limits.request-series=0
The maximum series allowed for a single Series
request. The Series call fails if this limit is
exceeded. 0 means no limit.
--sync-block-duration=15m Repeat interval for syncing the blocks between
local and remote view.
--tracing.config=<content>
Alternative to 'tracing.config-file' flag
(mutually exclusive). Content of YAML file
with tracing configuration. See format details:
https://thanos.io/tip/thanos/tracing.md/#configuration
--tracing.config-file=<file-path>
Path to YAML file with tracing
configuration. See format details:
https://thanos.io/tip/thanos/tracing.md/#configuration
--version Show application version.
--web.disable Disable Block Viewer UI.
--web.disable-cors Whether to disable CORS headers to be set by
Thanos. By default Thanos sets CORS headers to
be allowed by all.
--web.external-prefix="" Static prefix for all HTML links and redirect
URLs in the bucket web UI interface.
Actual endpoints are still served on / or the
web.route-prefix. This allows thanos bucket
web UI to be served behind a reverse proxy that
strips a URL sub-path.
--web.prefix-header="" Name of HTTP request header used for dynamic
prefixing of UI links and redirects.
This option is ignored if web.external-prefix
argument is set. Security risk: enable
this option only if a reverse proxy in
front of thanos is resetting the header.
The --web.prefix-header=X-Forwarded-Prefix
option can be useful, for example, if Thanos
UI is served via Traefik reverse proxy with
PathPrefixStrip option enabled, which sends the
stripped prefix value in X-Forwarded-Prefix
header. This allows thanos UI to be served on a
sub-path.
Time based partitioning #
By default Thanos Store Gateway looks at all the data in Object Store and returns it based on query’s time range.
Thanos Store --min-time, --max-time flags allows you to shard Thanos Store based on constant time or time duration relative to current time.
For example setting: --min-time=-6w & --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 --min-time=2018-01-01T00:00:00Z, --max-time=2019-01-01T23:59:59Z.
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 --min-time & --max-time.
External Label Partitioning (Sharding) #
Check more here.
Probes #
- Thanos Store exposes two endpoints for probing.
/-/healthystarts as soon as initial setup is 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
/-/readypath.
Index cache #
Thanos Store Gateway supports an index cache to speed up postings and series lookups from TSDB blocks indexes. Three types of caches are supported:
in-memory(default)memcachedredis
In-memory index cache #
The in-memory index cache is enabled by default and its max size can be configured through the flag --index-cache-size.
Alternatively, the in-memory index cache can also be configured using --index-cache.config-file to reference the configuration file or --index-cache.config to put yaml config directly:
type: IN-MEMORY
config:
max_size: 0
max_item_size: 0
enabled_items: []
ttl: 0s
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.250MB).max_item_size: maximum size of single item, in bytes. The value should be specified with a bytes unit (ie.125MB).enabled_items: selectively choose what types of items to cache. Supported values arePostings,SeriesandExpandedPostings. By default, all items are cached.ttl: this field doesn’t do anything for inmemory cache.
Memcached index cache #
The memcached index cache allows to use Memcached as cache backend. This cache type is configured using --index-cache.config-file to reference 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_get_multi_concurrency: 0
max_item_size: 0
max_get_multi_batch_size: 0
dns_provider_update_interval: 0s
auto_discovery: false
set_async_circuit_breaker_config:
enabled: false
half_open_max_requests: 0
open_duration: 0s
min_requests: 0
consecutive_failures: 0
failure_percent: 0
enabled_items: []
ttl: 0s
The required settings are:
addresses: list of memcached addresses, that will get resolved with the DNS service discovery provider. If your cluster supports auto-discovery, you should use the flagauto_discoveryinstead and only point to one of the memcached servers. This typically means that there should be only one address specified that resolves to any of the alive memcached servers. Use this for Amazon ElastiCache and other similar services.
NOTE: The Memcached client uses a jump hash algorithm to shard cached entries across a cluster of Memcached servers. For this reason, you should make sure memcached servers are not behind any kind of load balancer and their address is configured so that servers are added/removed to the end of the list whenever a scale up/down occurs. For example, if you’re running Memcached in Kubernetes, you may:
- Deploy your Memcached cluster using a StatefulSet
- Create a headless service for Memcached StatefulSet
- Configure the Thanos’s memcached
addressesusing thednssrvnoa+DNS service discovery
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 to0, 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 split into multiple batches and fetched concurrently, honoringmax_get_multi_concurrency. If set to0, 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 to0, the item size is unlimited.dns_provider_update_interval: the DNS discovery update interval.auto_discovery: whether to use the auto-discovery mechanism for memcached.set_async_circuit_breaker_config: the configuration for the circuit breaker for asynchronous set operations.enabled:trueto enable circuite breaker for asynchronous operations. The circuit breaker consists of three states: closed, half-open, and open. It begins in the closed state. When the total requests exceedmin_requests, and either consecutive failures occur or the failure percentage is excessively high according to the configured values, the circuit breaker transitions to the open state. This results in the rejection of all asynchronous operations. Afteropen_duration, the circuit breaker transitions to the half-open state, where it allowshalf_open_max_requestsasynchronous operations to be processed in order to test if the conditions have improved. If they have not, the state transitions back to open; if they have, it transitions to the closed state. Following each 10 seconds interval in the closed state, the circuit breaker resets its metrics and repeats this cycle.half_open_max_requests: maximum number of requests allowed to pass through when the circuit breaker is half-open. If set to 0, the circuit breaker allows only 1 request.open_duration: the period of the open state after which the state of the circuit breaker becomes half-open. If set to 0, the circuit breaker utilizes the default value of 60 seconds.min_requests: minimal requests to trigger the circuit breaker, 0 signifies no requirements.consecutive_failures: consecutive failures based onmin_requeststo determine if the circuit breaker should open.failure_percent: the failure percentage, which is based onmin_requests, to determine if the circuit breaker should open.
enabled_items: selectively choose what types of items to cache. Supported values arePostings,SeriesandExpandedPostings. By default, all items are cached.ttl: ttl to store index cache items in memcached.
Redis index cache #
The redis index cache allows to use Redis as cache backend. This cache type is configured using --index-cache.config-file to reference the configuration file or --index-cache.config to put yaml config directly:
type: REDIS
config:
addr: ""
username: ""
password: ""
db: 0
dial_timeout: 5s
read_timeout: 3s
write_timeout: 3s
max_get_multi_concurrency: 100
get_multi_batch_size: 100
max_set_multi_concurrency: 100
set_multi_batch_size: 100
tls_enabled: false
tls_config:
ca_file: ""
cert_file: ""
key_file: ""
server_name: ""
insecure_skip_verify: false
cache_size: 0
master_name: ""
max_async_buffer_size: 10000
max_async_concurrency: 20
set_async_circuit_breaker_config:
enabled: false
half_open_max_requests: 10
open_duration: 5s
min_requests: 50
consecutive_failures: 5
failure_percent: 0.05
enabled_items: []
ttl: 0s
The required settings are:
addr: redis server address.
While the remaining settings are optional:
username: the username to connect to redis, only redis 6.0 and grater need this field.password: the password to connect to redis.db: the database to be selected after connecting to the server.dial_timeout: the redis dial timeout.read_timeout: the redis read timeout.write_timeout: the redis write timeout.cache_sizesize of the in-memory cache used for client-side caching. Client-side caching is enabled when this value is not zero. See official documentation for more. It is highly recommended to enable this so that Thanos Store would not need to continuously retrieve data from Redis for repeated requests of the same key(-s).enabled_items: selectively choose what types of items to cache. Supported values arePostings,SeriesandExpandedPostings. By default, all items are cached.ttl: ttl to store index cache items in redis.
Here is an example of what effect client-side caching could have:
pool_size: maximum number of socket connections.min_idle_conns: specifies the minimum number of idle connections which is useful when establishing new connection is slow.idle_timeout: amount of time after which client closes idle connections. Should be less than server’s timeout.max_conn_age: connection age at which client retires (closes) the connection.max_get_multi_concurrency: specifies the maximum number of concurrent GetMulti() operations.get_multi_batch_size: specifies the maximum size per batch for mget.max_set_multi_concurrency: specifies the maximum number of concurrent SetMulti() operations.set_multi_batch_size: specifies the maximum size per batch for pipeline set.tls_enabled: enables the use of TLS to connect to redistls_config: TLS connection configuration:ca_file: path to Root CA certificate file to usecert_file: path to Client Certificate file to usekey_file: path to the Key file for cert_file (NOTE: Both this andcert_filemust be set if used)servername: Override the server name used to validate the server certificateinsecure_skip_verify: Disable certificate verification
Caching Bucket #
Thanos Store Gateway supports a “caching bucket” with chunks and metadata caching to speed up loading of chunks from TSDB blocks. To configure caching, one needs to use --store.caching-bucket.config=<yaml content> or --store.caching-bucket.config-file=<file.yaml>.
memcached/in-memory/redis cache “backend"s are supported:
type: MEMCACHED # Case-insensitive
config:
addresses: []
timeout: 500ms
max_idle_connections: 100
max_async_concurrency: 20
max_async_buffer_size: 10000
max_item_size: 1MiB
max_get_multi_concurrency: 100
max_get_multi_batch_size: 0
dns_provider_update_interval: 10s
chunk_subrange_size: 16000
max_chunks_get_range_requests: 3
chunk_object_attrs_ttl: 24h
chunk_subrange_ttl: 24h
blocks_iter_ttl: 5m
metafile_exists_ttl: 2h
metafile_doesnt_exist_ttl: 15m
metafile_content_ttl: 24h
metafile_max_size: 1MiB
configfield for memcached supports all the same configuration as memcached for index cache.addressesin the config field is a required settingconfigfield for redis supports all the same configuration as redis for index cache.
Additional options to configure various aspects of chunks cache are available:
chunk_subrange_size: size of segment of chunks object that is stored to the cache. This is the smallest unit that chunks cache is working with.max_chunks_get_range_requests: how many “get range” sub-requests may cache perform to fetch missing subranges.chunk_object_attrs_ttl: how long to keep information about chunk file attributes (e.g. size) in the cache.chunk_subrange_ttl: how long to keep individual subranges in the cache.
Following options are used for metadata caching (meta.json files, deletion mark files, iteration result):
blocks_iter_ttl: how long to cache result of iterating blocks.metafile_exists_ttl: how long to cache information about whether meta.json or deletion mark file exists.metafile_doesnt_exist_ttl: how long to cache information about whether meta.json or deletion mark file doesn’t exist.metafile_content_ttl: how long to cache content of meta.json and deletion mark files.metafile_max_size: maximum size of cached meta.json and deletion mark file. Larger files are not cached.
The yml structure for setting the in memory cache configs for caching bucket is the same as the in-memory index cache and all the options to configure Caching Bucket mentioned above can be used.
In addition to the same cache backends memcached/in-memory/redis, caching bucket supports another type of backend.
EXPERIMENTAL Groupcache Caching Bucket Provider #
Groupcache is an experimental cache backend for the caching bucket introduced from version v0.25 of Thanos.
With groupcache, you do not need any external components for the caching layer because the caching layer becomes shared between all of the processes of Thanos Store. Another benefit that it provides is that it is a cache filling library meaning that given enough space in memory, the values will only be loaded once. For example, if the same metric is used in multiple concurrent queries then with groupcache Thanos Store would only load the metric’s data from remote object storage once.
All in all, it should be a superior caching solution to all other currently supported solutions. It just needs some battle-testing. So, help is needed with testing in real life scenarios! Please create an issue if you’ve found any problem. 🤗
Here is how it looks like:
Note that with groupcache enabled, new routes are registered on the HTTP server with the prefix /_groupcache. Using those routes, anyone can access any kind of data in the configured remote object storage. So, if you are exposing your Thanos Store to the Internet then it is highly recommended to use a reverse proxy in front and disable access to /_groupcache/....
Currently TLS is supported but on the client’s side no verification is done of the received certificate. This will be added in the future. HTTP2 over cleartext is also enabled to improve the performance for users that don’t use TLS.
Example configuration that you could provide to the caching bucket configuration flags with the explanation of each configuration key:
type: GROUPCACHE
config:
self_url: http://10.123.22.3:8080
peers:
- http://10.123.22.3:8080
- http://10.123.22.10:8080
- http://10.123.22.100:8080
groupcache_group: test_group
dns_interval: 1s
timeout: 2s
In this case, three Thanos Store nodes are running in the same group meaning that they all point to the same remote object storage.
self_url- our own URL. On each node this will be different. This should be the external IP through which other nodes could access us;groupcache_group- the groupcache group’s name. All nodes using the same remote object storage configuration should use the same name. It is used in the HTTP requests. If it is different then nodes will not be able to load data from each other.dns_internal- how often DNS lookups should be made.
In the peers section it is possible to use the prefix form to automatically look up the peers using DNS. For example, you could use dns+http://store.thanos.consul.svc:8080 to automatically look up healthy nodes from Consul using its DNS interface.
Note that there must be no trailing slash in the peers configuration i.e. one of the strings must be identical to self_url and others should have the same form. Without this, loading data from peers may fail.
If timeout is set to zero then there is no timeout for fetching and fetching’s lifetime is equal to the lifetime to the original request’s lifetime. It is recommended to keep it higher than zero. It is generally preferred to keep this value higher because the fetching operation potentially includes loading of data from remote object storage.
Hedged Requests #
Thanos Store Gateway supports hedged requests to enhance performance and reliability, particularly in high-latency environments. This feature addresses long-tail latency issues that can occur between the Thanos Store Gateway and an external cache, reducing the impact of slower response times on overall performance.
The configuration options for hedged requests allow for tuning based on latency tolerance and cost considerations, as some providers may charge per request.
In the bucket.yml file, you can specify the following fields under hedging_config:
enabled: bool to enable hedged requests.up_to: maximum number of hedged requests allowed for each initial request.- Purpose: controls the redundancy level of hedged requests to improve response times.
- Cost vs. Benefit: increasing up_to can reduce latency but may increase costs, as some providers charge per request. Higher values provide diminishing returns on latency beyond a certain level.
quantile: latency threshold, specified as a quantile (e.g., percentile), which determines when additional hedged requests should be sent.- Purpose: controls when hedged requests are triggered based on response time distribution.
- Cost vs. Benefit: lower quantile (e.g., 0.7) initiates hedged requests sooner, potentially raising costs while lowering latency variance. A higher quantile (e.g., 0.95) will initiate hedged requests later, reducing cost by limiting redundancy.
By default, hedging_config is set as follows:
hedging_config:
enabled: false
up_to: 3
quantile: 0.9
This configuration sends up to three additional requests if the initial request response time exceeds the 90th percentile.
Index Header #
In order to query series inside blocks from object storage, Store Gateway has to know certain initial info from each block index. In order to achieve so, on startup the Gateway builds an index-header for each block and stores it on local disk; such index-header is build by downloading specific pieces of original block’s index, stored on local disk and then mmaped and used by Store Gateway.
For more information, please refer to the Binary index-header operational guide.
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