mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-10-26 18:30:48 +00:00
84 lines
3.2 KiB
Markdown
84 lines
3.2 KiB
Markdown
|
## Test stand for multiple disks feature
|
||
|
|
|
||
|
|
Currently for namual tests, can be easily scripted to be the part of inntergration tests.
|
||
|
|
|
||
|
|
To run you need to have docker & docker-compose.
|
||
|
|
|
||
|
|
```
|
||
|
|
(Check makefile)
|
||
|
|
make run
|
||
|
|
make ch1_shell
|
||
|
|
> clickhouse-client
|
||
|
|
|
||
|
|
make logs # Ctrl+C
|
||
|
|
make cleup
|
||
|
|
```
|
||
|
|
|
||
|
|
### basic
|
||
|
|
|
||
|
|
* allows to configure multiple disks & folumes & shemas
|
||
|
|
* clickhouse check that all disks are write-accessible
|
||
|
|
* clickhouse can create a table with provided schema
|
||
|
|
|
||
|
|
### one volume-one disk custom schema
|
||
|
|
|
||
|
|
* clickhouse puts data to correct folder when schema is used
|
||
|
|
* clickhouse can do merges / detach / attach / freeze on that folder
|
||
|
|
|
||
|
|
### one volume-multiple disks schema (JBOD scenario)
|
||
|
|
|
||
|
|
* clickhouse uses round-robin to place new parts
|
||
|
|
* clickhouse can do merges / detach / attach / freeze on that folder
|
||
|
|
|
||
|
|
### two volumes-one disk per volume (fast expensive / slow cheap storage)
|
||
|
|
|
||
|
|
* clickhouse uses round-robin to place new parts
|
||
|
|
* clickhouse can do merges / detach / attach / freeze on that folder
|
||
|
|
* clickhouse put parts to different volumes depending on part size
|
||
|
|
|
||
|
|
### use 'default' schema for tables created without schema provided.
|
||
|
|
|
||
|
|
|
||
|
|
# ReplicatedMergeTree
|
||
|
|
|
||
|
|
....
|
||
|
|
|
||
|
|
For all above:
|
||
|
|
clickhouse respect free space limitation setting.
|
||
|
|
ClickHouse writes important disk-related information to logs.
|
||
|
|
|
||
|
|
## Queries
|
||
|
|
|
||
|
|
```
|
||
|
|
CREATE TABLE schema_default (id UInt64) Engine=MergeTree() ORDER BY (id);
|
||
|
|
|
||
|
|
INSERT INTO schema_default SELECT * FROM numbers(1);
|
||
|
|
CREATE TABLE schema_default_explicit (id UInt64) Engine=MergeTree() ORDER BY (id) SETTINGS storage_schema_name='default';
|
||
|
|
CREATE TABLE schema_default_disk_with_external (id UInt64) Engine=MergeTree() ORDER BY (id) SETTINGS storage_schema_name='default_disk_with_external';
|
||
|
|
CREATE TABLE schema_jbod_with_external (id UInt64) Engine=MergeTree() ORDER BY (id) SETTINGS storage_schema_name='jbod_with_external';
|
||
|
|
|
||
|
|
CREATE TABLE replicated_schema_default (id UInt64) Engine=ReplicatedMergeTree('/clickhouse/tables/{database}/{table}', '{replica}') ORDER BY (id);
|
||
|
|
CREATE TABLE replicated_schema_default_explicit (id UInt64) Engine=ReplicatedMergeTree('/clickhouse/tables/{database}/{table}', '{replica}') ORDER BY (id) SETTINGS storage_schema_name='default';
|
||
|
|
CREATE TABLE replicated_schema_default_disk_with_external (id UInt64) Engine=ReplicatedMergeTree('/clickhouse/tables/{database}/{table}', '{replica}') ORDER BY (id) SETTINGS storage_schema_name='default_disk_with_external';
|
||
|
|
CREATE TABLE replicated_schema_jbod_with_external (id UInt64) Engine=ReplicatedMergeTree('/clickhouse/tables/{database}/{table}', '{replica}') ORDER BY (id) SETTINGS storage_schema_name='jbod_with_external';
|
||
|
|
```
|
||
|
|
|
||
|
|
|
||
|
|
## Extra acceptance criterias
|
||
|
|
|
||
|
|
* hardlinks problems. Thouse stetements should be able to work properly (or give a proper feedback) on multidisk scenarios
|
||
|
|
* ALTER TABLE ... UPDATE
|
||
|
|
* ALTER TABLE ... TABLE
|
||
|
|
* ALTER TABLE ... MODIFY COLUMN ...
|
||
|
|
* ALTER TABLE ... CLEAR COLUMN
|
||
|
|
* ALTER TABLE ... REPLACE PARTITION ...
|
||
|
|
* Maintainance - system tables show proper values:
|
||
|
|
* system.parts
|
||
|
|
* system.tables
|
||
|
|
* system.part_log (target disk?)
|
||
|
|
* New system table
|
||
|
|
* system.volumes
|
||
|
|
* system.disks
|
||
|
|
* system.schemas
|
||
|
|
* chown / create needed disk folders in docker
|