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Some improvements for replication.md

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Ivan Blinkov 2018-12-11 14:39:09 +03:00
parent 1458d8f8ad
commit 4b075aa269
2 changed files with 26 additions and 3 deletions
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6
docs/en/operations/table_engines/replication.md
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@ -93,7 +93,7 @@ ORDER BY (CounterID, EventDate, intHash32(UserID))
SAMPLE BY intHash32(UserID)
```
Example in deprecated syntax:
<details><summary>Example in deprecated syntax</summary>
```sql
CREATE TABLE table_name
@ -104,6 +104,8 @@ CREATE TABLE table_name
) ENGINE = ReplicatedMergeTree('/clickhouse/tables/{layer}-{shard}/hits', '{replica}', EventDate, intHash32(UserID), (CounterID, EventDate, intHash32(UserID), EventTime), 8192)
```
</details>
As the example shows, these parameters can contain substitutions in curly brackets. The substituted values are taken from the 'macros' section of the configuration file. Example:
```xml
@ -180,7 +182,7 @@ There is no restriction on network bandwidth during recovery. Keep this in mind
We use the term `MergeTree` to refer to all table engines in the ` MergeTree family`, the same as for `ReplicatedMergeTree`.
If you had a `MergeTree` table that was manually replicated, you can convert it to a replicatable table. You might need to do this if you have already collected a large amount of data in a `MergeTree` table and now you want to enable replication.
If you had a `MergeTree` table that was manually replicated, you can convert it to a replicated table. You might need to do this if you have already collected a large amount of data in a `MergeTree` table and now you want to enable replication.
If the data differs on various replicas, first sync it, or delete this data on all the replicas except one.

23
docs/ru/operations/table_engines/replication.md
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@ -78,10 +78,31 @@
Пример:
```sql
CREATE TABLE table_name
(
EventDate DateTime,
CounterID UInt32,
UserID UInt32
) ENGINE = ReplicatedMergeTree('/clickhouse/tables/{layer}-{shard}/hits', '{replica}')
PARTITION BY toYYYYMM(EventDate)
ORDER BY (CounterID, EventDate, intHash32(UserID))
SAMPLE BY intHash32(UserID)
```
ReplicatedMergeTree('/clickhouse/tables/{layer}-{shard}/hits', '{replica}', EventDate, intHash32(UserID), (CounterID, EventDate, intHash32(UserID), EventTime), 8192)
<details><summary>Пример в устаревшем синтаксисе</summary>
```sql
CREATE TABLE table_name
(
EventDate DateTime,
CounterID UInt32,
UserID UInt32
) ENGINE = ReplicatedMergeTree('/clickhouse/tables/{layer}-{shard}/hits', '{replica}', EventDate, intHash32(UserID), (CounterID, EventDate, intHash32(UserID), EventTime), 8192)
```
</details>
Как видно в примере, эти параметры могут содержать подстановки в фигурных скобках. Подставляемые значения достаются из конфигурационного файла, из секции macros. Пример:
```xml