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VictoriaMetrics/docs/Single-server-VictoriaMetrics.md
Aliaksandr Valialkin 7d8d921db9 docs: add references to Remote Write Storage Wars 
Also mention than VictoriaMetrics uses less RAM than Thanos Store Gateway - see https://github.com/thanos-io/thanos/issues/448 for details.
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VictoriaMetrics

VictoriaMetrics is fast, cost-effective and scalable time-series database. It can be used as long-term remote storage for Prometheus. It is available in binary releases, docker images and in source code. Just download VictoriaMetrics and see how to start it.

Cluster version is available here.

Case studies

Prominent features

Operation

Table of contents

How to start VictoriaMetrics

Just start VictoriaMetrics executable or docker image with the desired command-line flags.

The following command-line flags are used the most:

  • -storageDataPath - path to data directory. VictoriaMetrics stores all the data in this directory. Default path is victoria-metrics-data in current working directory.
  • -retentionPeriod - retention period in months for the data. Older data is automatically deleted. Default period is 1 month.
  • -httpListenAddr - TCP address to listen to for http requests. By default, it listens port 8428 on all the network interfaces.
  • -graphiteListenAddr - TCP and UDP address to listen to for Graphite data. By default, it is disabled.
  • -opentsdbListenAddr - TCP and UDP address to listen to for OpenTSDB data over telnet protocol. By default, it is disabled.
  • -opentsdbHTTPListenAddr - TCP address to listen to for HTTP OpenTSDB data over /api/put. By default, it is disabled.

Pass -help to see all the available flags with description and default values.

It is recommended setting up monitoring for VictoriaMetrics.

Prometheus setup

Add the following lines to Prometheus config file (it is usually located at /etc/prometheus/prometheus.yml):

remote_write:
  - url: http://<victoriametrics-addr>:8428/api/v1/write
    queue_config:
      max_samples_per_send: 10000
      max_shards: 30

Substitute <victoriametrics-addr> with the hostname or IP address of VictoriaMetrics. Then apply the new config via the following command:

kill -HUP `pidof prometheus`

Prometheus writes incoming data to local storage and replicates it to remote storage in parallel. This means the data remains available in local storage for --storage.tsdb.retention.time duration even if remote storage is unavailable.

If you plan to send data to VictoriaMetrics from multiple Prometheus instances, then add the following lines into global section of Prometheus config:

global:
  external_labels:
    datacenter: dc-123

This instructs Prometheus to add datacenter=dc-123 label to each time series sent to remote storage. The label name may be arbitrary - datacenter is just an example. The label value must be unique across Prometheus instances, so those time series may be filtered and grouped by this label.

It is recommended upgrading Prometheus to v2.12.0 or newer, since the previous versions may have issues with remote_write.

Grafana setup

Create Prometheus datasource in Grafana with the following Url:

http://<victoriametrics-addr>:8428

Substitute <victoriametrics-addr> with the hostname or IP address of VictoriaMetrics.

Then build graphs with the created datasource using Prometheus query language. VictoriaMetrics supports native PromQL and extends it with useful features.

How to upgrade VictoriaMetrics?

It is safe upgrading VictoriaMetrics to new versions unless release notes say otherwise. It is recommended performing regular upgrades to the latest version, since it may contain important bug fixes, performance optimizations or new features.

Follow the following steps during the upgrade:

  1. Send SIGINT signal to VictoriaMetrics process in order to gracefully stop it.
  2. Wait until the process stops. This can take a few seconds.
  3. Start the upgraded VictoriaMetrics.

Prometheus doesn't drop data during VictoriaMetrics restart. See this article for details.

How to apply new config to VictoriaMetrics?

VictoriaMetrics must be restarted for applying new config:

  1. Send SIGINT signal to VictoriaMetrics process in order to gracefully stop it.
  2. Wait until the process stops. This can take a few seconds.
  3. Start VictoriaMetrics with the new config.

Prometheus doesn't drop data during VictoriaMetrics restart. See this article for details.

How to send data from InfluxDB-compatible agents such as Telegraf?

Just use http://<victoriametric-addr>:8428 url instead of InfluxDB url in agents' configs. For instance, put the following lines into Telegraf config, so it sends data to VictoriaMetrics instead of InfluxDB:

[[outputs.influxdb]]
  urls = ["http://<victoriametrics-addr>:8428"]

Do not forget substituting <victoriametrics-addr> with the real address where VictoriaMetrics runs.

VictoriaMetrics maps Influx data using the following rules:

  • db query arg is mapped into db label value unless db tag exists in the Influx line.
  • Field names are mapped to time series names prefixed with {measurement}{separator} value, where {separator} equals to _ by default. It can be changed with -influxMeasurementFieldSeparator command-line flag. See also -influxSkipSingleField command-line flag. If {measurement} is empty, then time series names correspond to field names.
  • Field values are mapped to time series values.
  • Tags are mapped to Prometheus labels as-is.

For example, the following Influx line:

foo,tag1=value1,tag2=value2 field1=12,field2=40

is converted into the following Prometheus data points:

foo_field1{tag1="value1", tag2="value2"} 12
foo_field2{tag1="value1", tag2="value2"} 40

Example for writing data with Influx line protocol to local VictoriaMetrics using curl:

curl -d 'measurement,tag1=value1,tag2=value2 field1=123,field2=1.23' -X POST 'http://localhost:8428/write'

An arbitrary number of lines delimited by '\n' may be sent in a single request. After that the data may be read via /api/v1/export endpoint:

curl -G 'http://localhost:8428/api/v1/export' -d 'match={__name__=~"measurement_.*"}'

The /api/v1/export endpoint should return the following response:

{"metric":{"__name__":"measurement_field1","tag1":"value1","tag2":"value2"},"values":[123],"timestamps":[1560272508147]}
{"metric":{"__name__":"measurement_field2","tag1":"value1","tag2":"value2"},"values":[1.23],"timestamps":[1560272508147]}

Note that Influx line protocol expects timestamps in nanoseconds by default, while VictoriaMetrics stores them with milliseconds precision.

How to send data from Graphite-compatible agents such as StatsD?

  1. Enable Graphite receiver in VictoriaMetrics by setting -graphiteListenAddr command line flag. For instance, the following command will enable Graphite receiver in VictoriaMetrics on TCP and UDP port 2003:
/path/to/victoria-metrics-prod -graphiteListenAddr=:2003
  1. Use the configured address in Graphite-compatible agents. For instance, set graphiteHost to the VictoriaMetrics host in StatsD configs.

Example for writing data with Graphite plaintext protocol to local VictoriaMetrics using nc:

echo "foo.bar.baz;tag1=value1;tag2=value2 123 `date +%s`" | nc -N localhost 2003

VictoriaMetrics sets the current time if the timestamp is omitted. An arbitrary number of lines delimited by \n may be sent in one go. After that the data may be read via /api/v1/export endpoint:

curl -G 'http://localhost:8428/api/v1/export' -d 'match=foo.bar.baz'

The /api/v1/export endpoint should return the following response:

{"metric":{"__name__":"foo.bar.baz","tag1":"value1","tag2":"value2"},"values":[123],"timestamps":[1560277406000]}

Querying Graphite data

Data sent to VictoriaMetrics via Graphite plaintext protocol may be read either via Prometheus querying API or via go-graphite/carbonapi.

How to send data from OpenTSDB-compatible agents?

VictoriaMetrics supports telnet put protocol and HTTP /api/put requests for ingesting OpenTSDB data.

Sending data via telnet put protocol

  1. Enable OpenTSDB receiver in VictoriaMetrics by setting -opentsdbListenAddr command line flag. For instance, the following command enables OpenTSDB receiver in VictoriaMetrics on TCP and UDP port 4242:
/path/to/victoria-metrics-prod -opentsdbListenAddr=:4242
  1. Send data to the given address from OpenTSDB-compatible agents.

Example for writing data with OpenTSDB protocol to local VictoriaMetrics using nc:

echo "put foo.bar.baz `date +%s` 123 tag1=value1 tag2=value2" | nc -N localhost 4242

An arbitrary number of lines delimited by \n may be sent in one go. After that the data may be read via /api/v1/export endpoint:

curl -G 'http://localhost:8428/api/v1/export' -d 'match=foo.bar.baz'

The /api/v1/export endpoint should return the following response:

{"metric":{"__name__":"foo.bar.baz","tag1":"value1","tag2":"value2"},"values":[123],"timestamps":[1560277292000]}

Sending OpenTSDB data via HTTP /api/put requests

  1. Enable HTTP server for OpenTSDB /api/put requests by setting -opentsdbHTTPListenAddr command line flag. For instance, the following command enables OpenTSDB HTTP server on port 4242:
/path/to/victoria-metrics-prod -opentsdbHTTPListenAddr=:4242
  1. Send data to the given address from OpenTSDB-compatible agents.

Example for writing a single data point:

curl -H 'Content-Type: application/json' -d '{"metric":"x.y.z","value":45.34,"tags":{"t1":"v1","t2":"v2"}}' http://localhost:4242/api/put

Example for writing multiple data points in a single request:

curl -H 'Content-Type: application/json' -d '[{"metric":"foo","value":45.34},{"metric":"bar","value":43}]' http://localhost:4242/api/put

After that the data may be read via /api/v1/export endpoint:

curl -G 'http://localhost:8428/api/v1/export' -d 'match[]=x.y.z' -d 'match[]=foo' -d 'match[]=bar'

The /api/v1/export endpoint should return the following response:

{"metric":{"__name__":"foo"},"values":[45.34],"timestamps":[1566464846000]}
{"metric":{"__name__":"bar"},"values":[43],"timestamps":[1566464846000]}
{"metric":{"__name__":"x.y.z","t1":"v1","t2":"v2"},"values":[45.34],"timestamps":[1566464763000]}

Prometheus querying API usage

VictoriaMetrics supports the following handlers from Prometheus querying API:

These handlers can be queried from Prometheus-compatible clients such as Grafana or curl.

VictoriaMetrics accepts additional args for /api/v1/labels and /api/v1/label/.../values handlers. See this feature request for details:

  • Any number time series selectors via match[] query arg.
  • Optional start and end query args for limiting the time range for the selected labels or label values.

Additionally VictoriaMetrics provides the following handlers:

  • /api/v1/series/count - it returns the total number of time series in the database. Note that this handler scans all the inverted index, so it can be slow if the database contains tens of millions of time series.
  • /api/v1/labels/count - it returns a list of label: values_count entries. It can be used for determining labels with the maximum number of values.

How to build from sources

We recommend using either binary releases or docker images instead of building VictoriaMetrics from sources. Building from sources is reasonable when developing additional features specific to your needs.

Development build

  1. Install Go. The minimum supported version is Go 1.12.
  2. Run make victoria-metrics from the root folder of the repository. It builds victoria-metrics binary and puts it into the bin folder.

Production build

  1. Install docker.
  2. Run make victoria-metrics-prod from the root folder of the repository. It builds victoria-metrics-prod binary and puts it into the bin folder.

ARM build

ARM build may run on Raspberry Pi or on energy-efficient ARM servers.

Development ARM build

  1. Install Go. The minimum supported version is Go 1.12.
  2. Run make victoria-metrics-arm or make victoria-metrics-arm64 from the root folder of the repository. It builds victoria-metrics-arm or victoria-metrics-arm64 binary respectively and puts it into the bin folder.

Production ARM build

  1. Install docker.
  2. Run make victoria-metrics-arm-prod or make victoria-metrics-arm64-prod from the root folder of the repository. It builds victoria-metrics-arm-prod or victoria-metrics-arm64-prod binary respectively and puts it into the bin folder.

Pure Go build (CGO_ENABLED=0)

Pure Go mode builds only Go code without cgo dependencies. This is an experimental mode, which may result in a lower compression ratio and slower decompression performance. Use it with caution!

  1. Install Go. The minimum supported version is Go 1.12.
  2. Run make victoria-metrics-pure from the root folder of the repository. It builds victoria-metrics-pure binary and puts it into the bin folder.

Building docker images

Run make package-victoria-metrics. It builds victoriametrics/victoria-metrics:<PKG_TAG> docker image locally. <PKG_TAG> is auto-generated image tag, which depends on source code in the repository. The <PKG_TAG> may be manually set via PKG_TAG=foobar make package-victoria-metrics.

Start with docker-compose

Docker-compose helps to spin up VictoriaMetrics, Prometheus and Grafana with one command. More details may be found here.

Setting up service

Read these instructions on how to set up VictoriaMetrics as a service in your OS.

Third-party contributions

How to work with snapshots?

VictoriaMetrics can create instant snapshots for all the data stored under -storageDataPath directory. Navigate to http://<victoriametrics-addr>:8428/snapshot/create in order to create an instant snapshot. The page will return the following JSON response:

{"status":"ok","snapshot":"<snapshot-name>"}

Snapshots are created under <-storageDataPath>/snapshots directory, where <-storageDataPath> is the command-line flag value. Snapshots can be archived to backup storage at any time with vmbackup.

The http://<victoriametrics-addr>:8428/snapshot/list page contains the list of available snapshots.

Navigate to http://<victoriametrics-addr>:8428/snapshot/delete?snapshot=<snapshot-name> in order to delete <snapshot-name> snapshot.

Navigate to http://<victoriametrics-addr>:8428/snapshot/delete_all in order to delete all the snapshots.

Steps for restoring from a snapshot:

  1. Stop VictoriaMetrics with kill -INT.
  2. Restore snapshot contents from backup with vmrestore to the directory pointed by -storageDataPath.
  3. Start VictoriaMetrics.

How to delete time series?

Send a request to http://<victoriametrics-addr>:8428/api/v1/admin/tsdb/delete_series?match[]=<timeseries_selector_for_delete>, where <timeseries_selector_for_delete> may contain any time series selector for metrics to delete. After that all the time series matching the given selector are deleted. Storage space for the deleted time series isn't freed instantly - it is freed during subsequent merges of data files.

It is recommended verifying which metrics will be deleted with the call to http://<victoria-metrics-addr>:8428/api/v1/series?match[]=<timeseries_selector_for_delete> before actually deleting the metrics.

How to export time series?

Send a request to http://<victoriametrics-addr>:8428/api/v1/export?match[]=<timeseries_selector_for_export>, where <timeseries_selector_for_export> may contain any time series selector for metrics to export. Use {__name__!=""} selector for fetching all the time series. The response would contain all the data for the selected time series in JSON streaming format. Each JSON line would contain data for a single time series. An example output:

{"metric":{"__name__":"up","job":"node_exporter","instance":"localhost:9100"},"values":[0,0,0],"timestamps":[1549891472010,1549891487724,1549891503438]}
{"metric":{"__name__":"up","job":"prometheus","instance":"localhost:9090"},"values":[1,1,1],"timestamps":[1549891461511,1549891476511,1549891491511]}

Optional start and end args may be added to the request in order to limit the time frame for the exported data. These args may contain either unix timestamp in seconds or RFC3339 values.

Exported data can be imported via POST'ing it to /api/v1/import.

How to import time series data?

Time series data can be imported via any supported ingestion protocol:

The most efficient protocol for importing data into VictoriaMetrics is /api/v1/import. Example for importing data obtained via /api/v1/export:

# Export the data from <source-victoriametrics>:
curl -s 'http://source-victoriametrics:8428/api/v1/export' -d 'match={__name__!=""}' > exported_data.jsonl

# Import the data to <destination-victoriametrics>:
curl -X POST 'http://destination-victoriametrics:8428/api/v1/import' -T exported_data.jsonl

Each request to /api/v1/import can load up to a single vCPU core on VictoriaMetrics. Import speed can be improved by splitting the original file into smaller parts and importing them concurrently. Note that the original file must be split on newlines.

Federation

VictoriaMetrics exports Prometheus-compatible federation data at http://<victoriametrics-addr>:8428/federate?match[]=<timeseries_selector_for_federation>.

Optional start and end args may be added to the request in order to scrape the last point for each selected time series on the [start ... end] interval. start and end may contain either unix timestamp in seconds or RFC3339 values. By default, the last point on the interval [now - max_lookback ... now] is scraped for each time series. The default value for max_lookback is 5m (5 minutes), but it can be overridden. For instance, /federate?match[]=up&max_lookback=1h would return last points on the [now - 1h ... now] interval. This may be useful for time series federation with scrape intervals exceeding 5m.

Capacity planning

A rough estimation of the required resources for ingestion path:

  • RAM size: less than 1KB per active time series. So, ~1GB of RAM is required for 1M active time series. Time series is considered active if new data points have been added to it recently or if it has been recently queried. The number of active time series may be obtained from vm_cache_entries{type="storage/hour_metric_ids"} metric exproted on the /metrics page. VictoriaMetrics stores various caches in RAM. Memory size for these caches may be limited by -memory.allowedPercent flag.

  • CPU cores: a CPU core per 300K inserted data points per second. So, ~4 CPU cores are required for processing the insert stream of 1M data points per second. The ingestion rate may be lower for high cardinality data or for time series with high number of labels. See this article for details. If you see lower numbers per CPU core, then it is likely active time series info doesn't fit caches, so you need more RAM for lowering CPU usage.

  • Storage space: less than a byte per data point on average. So, ~260GB is required for storing a month-long insert stream of 100K data points per second. The actual storage size heavily depends on data randomness (entropy). Higher randomness means higher storage size requirements. Read this article for details.

  • Network usage: outbound traffic is negligible. Ingress traffic is ~100 bytes per ingested data point via Prometheus remote_write API. The actual ingress bandwidth usage depends on the average number of labels per ingested metric and the average size of label values. The higher number of per-metric labels and longer label values mean the higher ingress bandwidth.

The required resources for query path:

  • RAM size: depends on the number of time series to scan in each query and the step argument passed to /api/v1/query_range. The higher number of scanned time series and lower step argument results in the higher RAM usage.

  • CPU cores: a CPU core per 30 millions of scanned data points per second.

  • Network usage: depends on the frequency and the type of incoming requests. Typical Grafana dashboards usually require negligible network bandwidth.

High availability

  1. Install multiple VictoriaMetrics instances in distinct datacenters (availability zones).
  2. Add addresses of these instances to remote_write section in Prometheus config:
remote_write:
  - url: http://<victoriametrics-addr-1>:8428/api/v1/write
    queue_config:
      max_samples_per_send: 10000
  # ...
  - url: http://<victoriametrics-addr-N>:8428/api/v1/write
    queue_config:
      max_samples_per_send: 10000
  1. Apply the updated config:
kill -HUP `pidof prometheus`
  1. Now Prometheus should write data into all the configured remote_write urls in parallel.
  2. Set up Promxy in front of all the VictoriaMetrics replicas.
  3. Set up Prometheus datasource in Grafana that points to Promxy.

If you have Prometheus HA pairs with replicas r1 and r2 in each pair, then configure each r1 to write data to victoriametrics-addr-1, while each r2 should write data to victoriametrics-addr-2.

Multiple retentions

Just start multiple VictoriaMetrics instances with distinct values for the following flags:

  • -retentionPeriod
  • -storageDataPath, so the data for each retention period is saved in a separate directory
  • -httpListenAddr, so clients may reach VictoriaMetrics instance with proper retention

Downsampling

There is no downsampling support at the moment, but:

  • VictoriaMetrics is optimized for querying big amounts of raw data. See benchmark results for heavy queries in this article.
  • VictoriaMetrics has good compression for on-disk data. See this article for details.

These properties reduce the need in downsampling. We plan to implement downsampling in the future. See this issue for details.

Multi-tenancy

Single-node VictoriaMetrics doesn't support multi-tenancy. Use cluster version instead.

Scalability and cluster version

Though single-node VictoriaMetrics cannot scale to multiple nodes, it is optimized for resource usage - storage size / bandwidth / IOPS, RAM, CPU. This means that a single-node VictoriaMetrics may scale vertically and substitute a moderately sized cluster built with competing solutions such as Thanos, Uber M3, InfluxDB or TimescaleDB. See vertical scalability benchmarks.

So try single-node VictoriaMetrics at first and then switch to cluster version if you still need horizontally scalable long-term remote storage for really large Prometheus deployments. Contact us for paid support.

Alerting

VictoriaMetrics doesn't support rule evaluation and alerting yet, so these actions must be performed either on Prometheus side or on Grafana side.

Security

Do not forget protecting sensitive endpoints in VictoriaMetrics when exposing it to untrusted networks such as the internet. Consider setting the following command-line flags:

Explicitly set internal network interface for TCP and UDP ports for data ingestion with Graphite and OpenTSDB formats. For example, substitute -graphiteListenAddr=:2003 with -graphiteListenAddr=<internal_iface_ip>:2003.

Tuning

  • There is no need in VictoriaMetrics tuning since it uses reasonable defaults for command-line flags, which are automatically adjusted for the available CPU and RAM resources.
  • There is no need in Operating System tuning since VictoriaMetrics is optimized for default OS settings. The only option is increasing the limit on the number of open files in the OS, so Prometheus instances could establish more connections to VictoriaMetrics.
  • The recommended filesystem is ext4, the recommended persistent storage is persistent HDD-based disk on GCP, since it is protected from hardware failures via internal replication and it can be resized on the fly. If you plan storing more than 1TB of data on ext4 partition or plan extending it to more than 16TB, then the following options are recommended to pass to mkfs.ext4:
mkfs.ext4 ... -O 64bit,huge_file,extent -T huge

Monitoring

VictoriaMetrics exports internal metrics in Prometheus format on the /metrics page. Add this page to Prometheus' scrape config in order to collect VictoriaMetrics metrics. There are officials Grafana dashboards for single-node VictoriaMetrics and clustered VictoriaMetrics.

The most interesting metrics are:

  • vm_cache_entries{type="storage/hour_metric_ids"} - the number of time series with new data points during the last hour aka active time series.
  • rate(vm_new_timeseries_created_total[5m]) - time series churn rate.
  • vm_rows{type="indexdb"} - the number of rows in inverted index. High value for this number usually mean high churn rate for time series.
  • Sum of vm_rows{type="storage/big"} and vm_rows{type="storage/small"} - total number of (timestamp, value) data points in the database.
  • Sum of all the vm_cache_size_bytes metrics - the total size of all the caches in the database.
  • vm_allowed_memory_bytes - the maximum allowed size for caches in the database. It is calculated as system_memory * <-memory.allowedPercent> / 100, where system_memory is the amount of system memory and -memory.allowedPercent is the corresponding flag value.
  • vm_rows_inserted_total - the total number of inserted rows since VictoriaMetrics start.

Troubleshooting

  • It is recommended to use default command-line flag values (i.e. don't set them explicitly) until the need in tweaking these flag values arises.

  • If VictoriaMetrics works slowly and eats more than a CPU core per 100K ingested data points per second, then it is likely you have too many active time series for the current amount of RAM. It is recommended increasing the amount of RAM on the node with VictoriaMetrics in order to improve ingestion performance. Another option is to increase -memory.allowedPercent command-line flag value. Be careful with this option, since too big value for -memory.allowedPercent may result in high I/O usage.

  • VictoriaMetrics requires free disk space for merging data files to bigger ones. It may slow down when there is no enough free space left. So make sure -storageDataPath directory has at least 20% of free space comparing to disk size.

  • If VictoriaMetrics doesn't work because of certain parts are corrupted due to disk errors, then just remove directoreis with broken parts. This will recover VictoriaMetrics at the cost of data loss stored in the broken parts. In the future, vmrecover tool will be created for automatic recovering from such errors.

Backfilling

Make sure that configured -retentionPeriod covers timestamps for the backfilled data.

It is recommended disabling query cache with -search.disableCache command-line flag when writing historical data with timestamps from the past, since the cache assumes that the data is written with the current timestamps. Query cache can be enabled after the backfilling is complete.

Profiling

VictoriaMetrics provides handlers for collecting the following Go profiles:

  • Memory profile. It can be collected with the following command:
curl -s http://<victoria-metrics-host>:8428/debug/pprof/heap > mem.pprof
  • CPU profile. It can be collected with the following command:
curl -s http://<victoria-metrics-host>:8428/debug/pprof/profile > cpu.pprof

The command for collecting CPU profile waits for 30 seconds before returning.

The collected profiles may be analyzed with go tool pprof.

Integrations

Roadmap

  • Replication #118
  • Support of Object Storages (GCS, S3, Azure Storage) #38
  • Data downsampling #36
  • Alert Manager Integration #119
  • CLI tool for data migration, re-balancing and adding/removing nodes #103

The discussion happens here. Feel free to comment any item or add own one.

Contacts

Contact us with any questions regarding VictoriaMetrics at info@victoriametrics.com.

Community and contributions

Feel free asking any questions regarding VictoriaMetrics:

If you like VictoriaMetrics and want to contribute, then we need the following:

  • Filing issues and feature requests here.
  • Spreading a word about VictoriaMetrics: conference talks, articles, comments, experience sharing with colleagues.
  • Updating documentation.

We are open to third-party pull requests provided they follow KISS design principle:

  • Prefer simple code and architecture.
  • Avoid complex abstractions.
  • Avoid magic code and fancy algorithms.
  • Avoid big external dependencies.
  • Minimize the number of moving parts in the distributed system.
  • Avoid automated decisions, which may hurt cluster availability, consistency or performance.

Adhering KISS principle simplifies the resulting code and architecture, so it can be reviewed, understood and verified by many people.

Reporting bugs

Report bugs and propose new features here.

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