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Merge pull request #129 from Altinity/sphoorti
SEO updates
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content/en/altinity-kb-setup-and-maintenance/altinity-kb-data-migration/distributed-table-cluster.md

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---
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title: "Distributed table to Cluster"
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title: "Distributed table to ClickHouse® Cluster"
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linkTitle: "Distributed table to cluster"
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description: >
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Distributed table to cluster
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Shifting INSERTs to a standby cluster
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keywords:
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- clickhouse distributed table
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- clickhouse distributed
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---
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In order to shift INSERTS to a standby cluster (for example increase zone availability or disaster recovery) some ClickHouse® features can be used.

content/en/altinity-kb-setup-and-maintenance/altinity-kb-who-ate-my-memory.md

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title: "Who ate my memory"
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linkTitle: "Who ate my memory"
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title: "Who ate my ClickHouse® memory?"
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linkTitle: "Who ate my memory?"
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description: >
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Who ate my memory
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*"It was here a few minutes ago..."*
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keywords:
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- clickhouse memory
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- clickhouse memory usage
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---
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```sql
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SELECT *, formatReadableSize(value)
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FROM system.asynchronous_metrics

content/en/altinity-kb-setup-and-maintenance/altinity-kb-zookeeper/clickhouse-keeper.md

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title: "clickhouse-keeper"
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linkTitle: "clickhouse-keeper"
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title: "Using clickhouse-keeper"
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linkTitle: "Using clickhouse-keeper"
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description: >
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clickhouse-keeper
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Moving to the ClickHouse® alternative to Zookeeper
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keywords:
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- clickhouse keeper
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- clickhouse-keeper
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---
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## clickhouse-keeper
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Since 2021 the development of built-in alternative for Zookeeper is happening, which goal is to address several design pitfalls, and get rid of extra dependency.
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Since 2021 the development of built-in ClickHouse® alternative for Zookeeper is happening, whose goal is to address several design pitfalls, and get rid of extra dependency.
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See slides: https://presentations.clickhouse.com/meetup54/keeper.pdf and video https://youtu.be/IfgtdU1Mrm0?t=2682
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## Current status (last updated: July 2023)
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Since version 23.3 we recommend using clickhouse-keeper for new installations.
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Even better if you will use the latest version of clickhouse-keeper (currently it's 23.7), and it's not necessary to use the same version of clickhouse-keeper as ClickHouse® itself.
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Even better if you will use the latest version of clickhouse-keeper (currently it's 23.7), and it's not necessary to use the same version of clickhouse-keeper as ClickHouse itself.
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For existing systems that currently use Apache Zookeeper, you can consider upgrading to clickhouse-keeper especially if you will upgrade clickhouse also.
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For existing systems that currently use Apache Zookeeper, you can consider upgrading to clickhouse-keeper especially if you will [upgrade ClickHouse](https://altinity.com/clickhouse-upgrade-overview/) also.
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But please remember that on very loaded systems the change can give no performance benefits or can sometimes lead to a worse performance.
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The development pace of keeper code is [still high](https://github.com/ClickHouse/ClickHouse/pulls?q=is%3Apr+keeper)
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so every new version should bring improvements / cover the issues, and stability/maturity grows from version to version, so
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if you want to play with clickhouse-keeper in some environment - please use the most recent ClickHouse releases! And of course: share your feedback :)
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if you want to play with clickhouse-keeper in some environment - please use [the most recent ClickHouse releases](https://altinity.com/altinity-stable/)! And of course: share your feedback :)
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# How does it work
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## How does clickhouse-keeper work?
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Official docs: https://clickhouse.com/docs/en/guides/sre/keeper/clickhouse-keeper/
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ClickHouse-keeper still need to be started additionally on few nodes (similar to 'normal' zookeeper) and speaks normal zookeeper protocol - needed to simplify A/B tests with real zookeeper.
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To test that you need to run 3 instances of clickhouse-server (which will mimic zookeeper) with an extra config like that:
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---
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type: redirect
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target: https://docs.altinity.com/altinitykubernetesoperator/kubernetesinstallguide/minikubeonlinux/
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alias: altinitykubernetesoperator/kubernetesinstallguide
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---

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