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update for setting change
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@ -51,10 +51,14 @@ SELECT * FROM hdfs_engine_table LIMIT 2
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## Implementation Details {#implementation-details}
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- Reads and writes can be parallel.
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- [Zero-copy](../../../operations/storing-data.md#zero-copy) replication is supported.
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- Not supported:
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- `ALTER` and `SELECT...SAMPLE` operations.
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- Indexes.
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- [Zero-copy](../../../operations/storing-data.md#zero-copy) replication is possible, but not recommended.
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:::warning Zero-copy replication is not ready for production
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Zero-copy replication is disabled by default in ClickHouse version 22.8 and higher. This feature is not recommended for production use.
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:::
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**Globs in path**
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@ -50,10 +50,14 @@ For more information about virtual columns see [here](../../../engines/table-eng
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## Implementation Details {#implementation-details}
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- Reads and writes can be parallel
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- [Zero-copy](../../../operations/storing-data.md#zero-copy) replication is supported.
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- Not supported:
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- `ALTER` and `SELECT...SAMPLE` operations.
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- Indexes.
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- [Zero-copy](../../../operations/storing-data.md#zero-copy) replication is possible, but not supported.
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:::warning Zero-copy replication is not ready for production
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Zero-copy replication is disabled by default in ClickHouse version 22.8 and higher. This feature is not recommended for production use.
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:::
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## Wildcards In Path {#wildcards-in-path}
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@ -1023,6 +1023,10 @@ Other parameters:
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Examples of working configurations can be found in integration tests directory (see e.g. [test_merge_tree_azure_blob_storage](https://github.com/ClickHouse/ClickHouse/blob/master/tests/integration/test_merge_tree_azure_blob_storage/configs/config.d/storage_conf.xml) or [test_azure_blob_storage_zero_copy_replication](https://github.com/ClickHouse/ClickHouse/blob/master/tests/integration/test_azure_blob_storage_zero_copy_replication/configs/config.d/storage_conf.xml)).
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:::warning Zero-copy replication is not ready for production
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Zero-copy replication is disabled by default in ClickHouse version 22.8 and higher. This feature is not recommended for production use.
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:::
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## Virtual Columns {#virtual-columns}
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- `_part` — Name of a part.
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@ -218,6 +218,10 @@ Default value: 0 (seconds)
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When this setting has a value greater than than zero only a single replica starts the merge immediately if merged part on shared storage and `allow_remote_fs_zero_copy_replication` is enabled.
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:::warning Zero-copy replication is not ready for production
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Zero-copy replication is disabled by default in ClickHouse version 22.8 and higher. This feature is not recommended for production use.
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:::
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Possible values:
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- Any positive integer.
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@ -316,4 +316,8 @@ Use [http_max_single_read_retries](../operations/settings/settings.md#http-max-s
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## Zero-copy Replication (not ready for production) {#zero-copy}
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ClickHouse supports zero-copy replication for `S3` and `HDFS` disks, which means that if the data is stored remotely on several machines and needs to be synchronized, then only the metadata is replicated (paths to the data parts), but not the data itself.
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Zero-copy replication is possible, but not recommended, with `S3` and `HDFS` disks. Zero-copy replication means that if the data is stored remotely on several machines and needs to be synchronized, then only the metadata is replicated (paths to the data parts), but not the data itself.
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:::warning Zero-copy replication is not ready for production
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Zero-copy replication is disabled by default in ClickHouse version 22.8 and higher. This feature is not recommended for production use.
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:::
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