DOCSUP-4162: Document the system.replicated_fetches system table

docs/en/operations/system-tables/replicated_fetches.md

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+# system.replicated_fetches {#system_tables-replicated_fetches}
+
+Contains information about currently running background fetches.
+
+Columns:
+
+-   `database` ([String](../../sql-reference/data-types/string.md)) — Name of the database.
+
+-   `table` ([String](../../sql-reference/data-types/string.md)) — Name of the table.
+
+-   `elapsed` ([Float64](../../sql-reference/data-types/float.md)) — The time elapsed (in seconds) since showing currently running background fetches started.
+
+-   `progress` ([Float64](../../sql-reference/data-types/float.md)) — The percentage of completed work from 0 to 1.
+
+-   `result_part_name` ([String](../../sql-reference/data-types/string.md)) — The name of the part that will be formed as the result of showing currently running background fetches.
+
+-   `result_part_path` ([String](../../sql-reference/data-types/string.md)) — Absolute path to the part that will be formed as the result of showing currently running background fetches.
+
+-   `partition_id` ([String](../../sql-reference/data-types/string.md)) — ID of the partition.
+
+-   `total_size_bytes_compressed` ([UInt64](../../sql-reference/data-types/int-uint.md)) — The total size (in bytes) of the compressed data in the result part.
+
+-   `bytes_read_compressed` ([UInt64](../../sql-reference/data-types/int-uint.md)) — The number of compressed bytes read from the result part.
+
+-   `source_replica_path` ([String](../../sql-reference/data-types/string.md)) — Absolute path to the source replica.
+
+-   `source_replica_hostname` ([String](../../sql-reference/data-types/string.md)) — Hostname of the source replica.
+
+-   `source_replica_port` ([UInt16](../../sql-reference/data-types/int-uint.md)) — Port number of the source replica.
+
+-   `interserver_scheme` ([String](../../sql-reference/data-types/string.md)) — Name of the interserver scheme.
+
+-   `URI` ([String](../../sql-reference/data-types/string.md)) — Uniform resource identifier.
+
+-   `to_detached` ([UInt8](../../sql-reference/data-types/int-uint.md)) — The flag indicates whether the currently running background fetch is being performed using the `TO DETACHED` expression.
+
+-   `thread_id` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Thread identifier.
+
+**Example**
+
+``` sql
+SELECT * FROM system.replicated_fetches LIMIT 1 FORMAT Vertical;
+```
+
+``` text
+Row 1:
+──────
+database:                    default
+table:                       t
+elapsed:                     7.243039876
+progress:                    0.41832135995612835
+result_part_name:            all_0_0_0
+result_part_path:            /var/lib/clickhouse/store/700/70080a04-b2de-4adf-9fa5-9ea210e81766/all_0_0_0/
+partition_id:                all
+total_size_bytes_compressed: 1052783726
+bytes_read_compressed:       440401920
+source_replica_path:         /clickhouse/test/t/replicas/1
+source_replica_hostname:     node1
+source_replica_port:         9009
+interserver_scheme:          http
+URI:                         http://node1:9009/?endpoint=DataPartsExchange%3A%2Fclickhouse%2Ftest%2Ft%2Freplicas%2F1&part=all_0_0_0&client_protocol_version=4&compress=false
+to_detached:                 0
+thread_id:                   54
+```
+
+**See Also**
+
+-   [Managing ReplicatedMergeTree Tables](../../sql-reference/statements/system/#query-language-system-replicated)
+
+[Original article](https://clickhouse.tech/docs/en/operations/system_tables/replicated_fetches) <!--hide-->

docs/ru/operations/system-tables/replicated_fetches.md

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+# system.replicated_fetches {#system_tables-replicated_fetches}
+
+Содержит информацию о выполняемых в данный момент фоновых операциях скачивания кусков данных с других реплик.
+
+Столбцы:
+
+-   `database` ([String](../../sql-reference/data-types/string.md)) — имя базы данных.
+
+-   `table` ([String](../../sql-reference/data-types/string.md)) — имя таблицы.
+
+-   `elapsed` ([Float64](../../sql-reference/data-types/float.md)) — время, прошедшее от момента начала скачивания куска, в секундах.
+
+-   `progress` ([Float64](../../sql-reference/data-types/float.md)) — доля выполненной работы от 0 до 1.
+
+-   `result_part_name` ([String](../../sql-reference/data-types/string.md)) — имя скачиваемого куска.
+
+-   `result_part_path` ([String](../../sql-reference/data-types/string.md)) — абсолютный путь к скачиваемому куску.
+
+-   `partition_id` ([String](../../sql-reference/data-types/string.md)) — идентификатор партиции.
+
+-   `total_size_bytes_compressed` ([UInt64](../../sql-reference/data-types/int-uint.md)) — общий размер сжатой информации в скачиваемом куске в байтах.
+
+-   `bytes_read_compressed` ([UInt64](../../sql-reference/data-types/int-uint.md)) — размер сжатой информации, считанной из скачиваемого куска, в байтах.
+
+-   `source_replica_path` ([String](../../sql-reference/data-types/string.md)) — абсолютный путь к исходной реплике.
+
+-   `source_replica_hostname` ([String](../../sql-reference/data-types/string.md)) — имя хоста исходной реплики.
+
+-   `source_replica_port` ([UInt16](../../sql-reference/data-types/int-uint.md)) — номер порта исходной реплики.
+
+-   `interserver_scheme` ([String](../../sql-reference/data-types/string.md)) — имя межсерверной схемы.
+
+-   `URI` ([String](../../sql-reference/data-types/string.md)) — универсальный идентификатор ресурса.
+
+-   `to_detached` ([UInt8](../../sql-reference/data-types/int-uint.md)) — флаг, указывающий на использование выражения `TO DETACHED` в текущих фоновых операциях.
+
+-   `thread_id` ([UInt64](../../sql-reference/data-types/int-uint.md)) — идентификатор потока.
+
+**Пример**
+
+``` sql
+SELECT * FROM system.replicated_fetches LIMIT 1 FORMAT Vertical;
+```
+
+``` text
+Row 1:
+──────
+database:                    default
+table:                       t
+elapsed:                     7.243039876
+progress:                    0.41832135995612835
+result_part_name:            all_0_0_0
+result_part_path:            /var/lib/clickhouse/store/700/70080a04-b2de-4adf-9fa5-9ea210e81766/all_0_0_0/
+partition_id:                all
+total_size_bytes_compressed: 1052783726
+bytes_read_compressed:       440401920
+source_replica_path:         /clickhouse/test/t/replicas/1
+source_replica_hostname:     node1
+source_replica_port:         9009
+interserver_scheme:          http
+URI:                         http://node1:9009/?endpoint=DataPartsExchange%3A%2Fclickhouse%2Ftest%2Ft%2Freplicas%2F1&part=all_0_0_0&client_protocol_version=4&compress=false
+to_detached:                 0
+thread_id:                   54
+```
+
+**Смотрите также**
+
+-   [Управление таблицами ReplicatedMergeTree](../../sql-reference/statements/system/#query-language-system-replicated)
+
+[Оригинальная статья](https://clickhouse.tech/docs/en/operations/system_tables/replicated_fetches) <!--hide-->