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Pablo Marcos 2024-08-20 14:06:39 +00:00
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18
docs/en/operations/named-collections.md
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@ -73,13 +73,21 @@ In the above example the `password_sha256_hex` value is the hexadecimal represen
### Storage for named collections
Named collections can either be stored on local disk or in zookeeper/keeper. By default local storage is used.
Named collections can either be stored on local disk or in ZooKeeper/Keeper. By default local storage is used.
They can also be stored using encryption with the same algorithms used for [disk encryption](storing-data#encrypted-virtual-file-system),
where `aes_128_ctr` is used by default.
To configure named collections storage in keeper and a `type` (equal to either `keeper` or `zookeeper`) and `path` (path in keeper, where named collections will be stored) to `named_collections_storage` section in configuration file:
To configure named collections storage you need to speficy a `type`. This can be either `local` or `keeper`/`zookeeper`. For encrypted storage,
you can use `local_encrypted` or `keeper_encrypted`/`zookeeper_encrypted`.
To use ZooKeeper/Keeper we also need to set up a `path` (path in ZooKeeper/Keeper, where named collections will be stored) to
`named_collections_storage` section in configuration file. The following example uses encryption and ZooKeeper/Keeper:
```
<clickhouse>
<named_collections_storage>
<type>zookeeper</type>
<type>zookeeper_encrypted</type>
<key_hex>bebec0cabebec0cabebec0cabebec0ca</key_hex>
<algorithm>aes_128_ctr</algorithm>
<path>/named_collections_path/</path>
<update_timeout_ms>1000</update_timeout_ms>
</named_collections_storage>
@ -315,7 +323,7 @@ The description of parameters see [postgresql](../sql-reference/table-functions/
Parameter `addresses_expr` is used in a collection instead of `host:port`. The parameter is optional, because there are other optional ones: `host`, `hostname`, `port`. The following pseudo code explains the priority:
```sql
CASE
CASE
WHEN collection['addresses_expr'] != '' THEN collection['addresses_expr']
WHEN collection['host'] != '' THEN collection['host'] || ':' || if(collection['port'] != '', collection['port'], '5432')
WHEN collection['hostname'] != '' THEN collection['hostname'] || ':' || if(collection['port'] != '', collection['port'], '5432')
@ -496,7 +504,7 @@ kafka_topic_list = 'kafka_topic',
kafka_group_name = 'consumer_group',
kafka_format = 'JSONEachRow',
kafka_max_block_size = '1048576';
```
### XML example