szehon-ho commented on code in PR #12115:
URL: https://github.com/apache/iceberg/pull/12115#discussion_r1956628329
##########
docs/docs/spark-procedures.md:
##########
@@ -972,4 +972,100 @@ CALL catalog_name.system.compute_table_stats(table =>
'my_table', snapshot_id =>
Collect statistics of the snapshot with id `snap1` of table `my_table` for
columns `col1` and `col2`
```sql
CALL catalog_name.system.compute_table_stats(table => 'my_table', snapshot_id
=> 'snap1', columns => array('col1', 'col2'));
-```
\ No newline at end of file
+```
+
+## Table Replication
+
+The `rewrite-table-path` procedure prepares an Iceberg table for moving or
copying to another location.
+
+### `rewrite-table-path`
+
+Stages a copy of the Iceberg table's metadata files where every absolute path
source prefix is replaced by the specified target prefix.
+This can be the starting point to fully or incrementally copy an Iceberg table
under a
+source prefix to another under the target prefix.
+
+!!! info
+ This procedure only prepares metadata or/and data files for an existing
Iceberg table for copying or moving to a new location.
+ Copying/Moving metadata and data files to the new location is not part of
this procedure.
+
+
+| Argument Name | Required? | default
| Type | Description
|
+|--------------------|-----------|------------------------------------------------|--------|-------------------------------------------------------------------------|
+| `table` | ✔️ |
| string | Name of the table
|
+| `source_prefix` | ✔️ |
| string | The existing prefix to be replaced
|
+| `target_prefix` | ✔️ |
| string | The replacement prefix for `source_prefix`
|
+| `start_version` | | first metadata.json in table's metadata log
| string | The name or path to the chronologically first metadata.json to
rewrite |
+| `end_version` | | latest metadata.json
| string | The name or path to the chronologically last metadata.json to
rewrite |
+| `staging_location` | | new directory under table's metadata
directory | string | The output location for newly modified metadata files
|
+
+
+#### Modes of operation:
+
+- Full Rewrite:
+
+By default, the procedure operates in full rewrite mode, rewriting all
reachable metadata files. This includes metadata.json, manifest lists,
manifests, and position delete files.
+
+- Incremental Rewrite:
+
+If `start_version` is provided, the procedure will only rewrite metadata files
created between `start_version` and `end_version`. `end_version` defaults to
the latest metadata.json of the table.
+
+#### Output
+
+| Output Name | Type | Description
|
+|----------------------|--------|-------------------------------------------------------------------|
+| `latest_version` | string | Name of the latest metadata file rewritten
by this procedure |
+| `file_list_location` | string | Path to a csv file containing a mapping of
source to target paths |
+
+##### File List Copy Plan
+The file list contains the copy plan for all files added to the table between
`startVersion` and `endVersion`.
+For each file, it specifies
+
+- Source Path:
+The original file path in the table, or the staging location if the file has
been rewritten.
+
+- Target Path:
+The path with the replacement prefix.
+
+The following example shows a copy plan for three files:
+
+```csv
+sourcepath/datafile1.parquet,targetpath/datafile1.parquet
+sourcepath/datafile2.parquet,targetpath/datafile2.parquet
+stagingpath/manifest.avro,targetpath/manifest.avro
+```
+
+#### Examples
+
+Full rewrite of a table's path from source location in HDFS to a target
location in S3 bucket of table `my_table`.
+This produces a new set of metadata using the s3a prefix in the default
staging location under table's metadata directory.
+
+```sql
+CALL catalog_name.system.rewrite_table_path(
+ table => 'db.my_table',
+ source_prefix => "hdfs://nn:8020/path/to/source_table",
+ target_prefix => "s3a://bucket/prefix/db.db/my_table"
+);
+```
+
+Incremental rewrite of a table's path from a source location to a target
location between metadata versions
+`v2.metadata.json` and `v20.metadata.json`, with files written to an explicit
staging location.
+
+```sql
+CALL catalog_name.system.rewrite_table_path(
+ table => 'db.my_table',
+ source_prefix => "s3a://bucketOne/prefix/db.db/my_table",
+ target_prefix => "s3a://bucketTwo/prefix/db.db/my_table",
+ start_version => "v2.metadata.json",
+ end_version => "v20.metadata.json",
+ staging_location => "s3a://bucketStaging/my_table"
+);
+```
+
+Once the rewrite is completed, third-party tools (
+eg.
[Distcp](https://hadoop.apache.org/docs/current/hadoop-distcp/DistCp.html)) can
be used to copy the newly created
+metadata files and data files to the target location.
+
+Lastly, [register_table](#register_table) procedure can be used to register
copied table in the target location with catalog.
Review Comment:
Nit: missing articles: 'register the copied table' and 'a catalog' ?
##########
docs/docs/spark-procedures.md:
##########
@@ -972,4 +972,100 @@ CALL catalog_name.system.compute_table_stats(table =>
'my_table', snapshot_id =>
Collect statistics of the snapshot with id `snap1` of table `my_table` for
columns `col1` and `col2`
```sql
CALL catalog_name.system.compute_table_stats(table => 'my_table', snapshot_id
=> 'snap1', columns => array('col1', 'col2'));
-```
\ No newline at end of file
+```
+
+## Table Replication
+
+The `rewrite-table-path` procedure prepares an Iceberg table for moving or
copying to another location.
+
+### `rewrite-table-path`
+
+Stages a copy of the Iceberg table's metadata files where every absolute path
source prefix is replaced by the specified target prefix.
+This can be the starting point to fully or incrementally copy an Iceberg table
located under an absolute path under a
+source prefix to another under the target prefix.
Review Comment:
Now 'another' seems like 'another Iceberg table'. How about, just:
```
This can be the starting point to fully or incrementally move or copy an
Iceberg table to a new location.
```
?
##########
docs/docs/spark-procedures.md:
##########
@@ -972,4 +972,100 @@ CALL catalog_name.system.compute_table_stats(table =>
'my_table', snapshot_id =>
Collect statistics of the snapshot with id `snap1` of table `my_table` for
columns `col1` and `col2`
```sql
CALL catalog_name.system.compute_table_stats(table => 'my_table', snapshot_id
=> 'snap1', columns => array('col1', 'col2'));
-```
\ No newline at end of file
+```
+
+## Table Replication
+
+The `rewrite-table-path` procedure prepares an Iceberg table for moving or
copying to another location.
+
+### `rewrite-table-path`
+
+Stages a copy of the Iceberg table's metadata files where every absolute path
source prefix is replaced by the specified target prefix.
+This can be the starting point to fully or incrementally copy an Iceberg table
located under an absolute path under a
+source prefix to another under the target prefix.
+
+!!! info
+ This procedure only prepares metadata or/and data files for an existing
Iceberg table for copying or moving to a new location.
Review Comment:
Adding copy + move everywhere in the doc is a bit awkward, I think it is not
a common case to 'mv' the file as it destroys the original table. Even if so,
I think the user will get it and we dont have to make the doc awkward for that?
##########
docs/docs/spark-procedures.md:
##########
@@ -972,4 +972,100 @@ CALL catalog_name.system.compute_table_stats(table =>
'my_table', snapshot_id =>
Collect statistics of the snapshot with id `snap1` of table `my_table` for
columns `col1` and `col2`
```sql
CALL catalog_name.system.compute_table_stats(table => 'my_table', snapshot_id
=> 'snap1', columns => array('col1', 'col2'));
-```
\ No newline at end of file
+```
+
+## Table Replication
+
+The `rewrite-table-path` procedure prepares an Iceberg table for moving or
copying to another location.
+
+### `rewrite-table-path`
+
+Stages a copy of the Iceberg table's metadata files where every absolute path
source prefix is replaced by the specified target prefix.
+This can be the starting point to fully or incrementally copy an Iceberg table
located under an absolute path under a
+source prefix to another under the target prefix.
+
+!!! info
+ This procedure only prepares metadata or/and data files for an existing
Iceberg table for copying or moving to a new location.
Review Comment:
How about:
`` This procedure only stages rewritten metadata files and prepares a list
of files to copy. The actual file copy is not part of this procedure.```
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