rszper commented on code in PR #30783:
URL: https://github.com/apache/beam/pull/30783#discussion_r1543219708


##########
examples/notebooks/beam-ml/bigtable_enrichment_transform.ipynb:
##########
@@ -509,15 +509,48 @@
         "id": "K41xhvmA5yQk"
       },
       "source": [
-        "To establish a client for the Bigtable enrichment handler, replace 
`<PROJECT_ID>`, `<INSTANCE_ID>`, and `<TABLE_ID>` with the appropriate values 
for those fields. The `row_key` variable is the field name from the input row 
that contains the row key to use when querying Bigtable.\n",
+        "Configure the `BigTableEnrichmentHandler` handler with the following 
required parameters:\n",
+        "\n",
+        "* `project_id`: the Google Cloud project ID for the Bigtable 
instance\n",
+        "* `instance_id`: the instance name of the Bigtable cluster\n",
+        "* `table_id`: the table ID of table containing relevant data\n",
+        "* `row_key`: The field name from the input row that contains the row 
key to use when querying Bigtable.\n",
         "\n",
-        "To convert a `string` type to a `byte` type or a `byte` type to a 
`string` type from Bigtable, you can configure additional options, such as 
[`app_profile_id`](https://cloud.google.com/bigtable/docs/app-profiles), 
[`row_filter`](https://cloud.google.com/python/docs/reference/bigtable/latest/row-filters),
 and 
[`encoding`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.bigtable.html#apache_beam.transforms.enrichment_handlers.bigtable.BigTableEnrichmentHandler:~:text=for%20more%20details.-,encoding,-(str)%20%E2%80%93%20encoding)
 type.\n",
+        "Optionally, to provide additional configuration to the 
`BigTableEnrichmentHandler` handler, see [module 
docs](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.bigtable.html#module-apache_beam.transforms.enrichment_handlers.bigtable)."

Review Comment:
   ```suggestion
           "Optionally, you can use parameters to further configure the 
`BigTableEnrichmentHandler` handler. For more information about the available 
parameters, see [enrichment handler module 
documentation](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.bigtable.html#module-apache_beam.transforms.enrichment_handlers.bigtable)."
   ```



##########
examples/notebooks/beam-ml/bigtable_enrichment_transform.ipynb:
##########
@@ -509,15 +509,48 @@
         "id": "K41xhvmA5yQk"
       },
       "source": [
-        "To establish a client for the Bigtable enrichment handler, replace 
`<PROJECT_ID>`, `<INSTANCE_ID>`, and `<TABLE_ID>` with the appropriate values 
for those fields. The `row_key` variable is the field name from the input row 
that contains the row key to use when querying Bigtable.\n",
+        "Configure the `BigTableEnrichmentHandler` handler with the following 
required parameters:\n",
+        "\n",
+        "* `project_id`: the Google Cloud project ID for the Bigtable 
instance\n",
+        "* `instance_id`: the instance name of the Bigtable cluster\n",
+        "* `table_id`: the table ID of table containing relevant data\n",
+        "* `row_key`: The field name from the input row that contains the row 
key to use when querying Bigtable.\n",
         "\n",
-        "To convert a `string` type to a `byte` type or a `byte` type to a 
`string` type from Bigtable, you can configure additional options, such as 
[`app_profile_id`](https://cloud.google.com/bigtable/docs/app-profiles), 
[`row_filter`](https://cloud.google.com/python/docs/reference/bigtable/latest/row-filters),
 and 
[`encoding`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.bigtable.html#apache_beam.transforms.enrichment_handlers.bigtable.BigTableEnrichmentHandler:~:text=for%20more%20details.-,encoding,-(str)%20%E2%80%93%20encoding)
 type.\n",
+        "Optionally, to provide additional configuration to the 
`BigTableEnrichmentHandler` handler, see [module 
docs](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.bigtable.html#module-apache_beam.transforms.enrichment_handlers.bigtable)."
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "id": "yFMcaf8i7TbI"
+      },
+      "source": [
+        "**Note:** When exceptions occur, by default, the logging severity is 
set to warning 
([`ExceptionLevel.WARN`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.WARN)).
  To configure the severity to raise exceptions, set `exception_level` to 
[`ExceptionLevel.RAISE`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.RAISE).
 To ignore exceptions, set `exception_level` to 
[`ExceptionLevel.QUIET`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.QUIET).\n",
         "\n",
-        "The default `encoding` type is `utf-8`.\n",
+        "The following example demonstrates how to set exception level in 
`BigTableEnrichmentHandler`:\n",

Review Comment:
   ```suggestion
           "The following example demonstrates how to set the exception level 
in the `BigTableEnrichmentHandler` handler:\n",
   ```



##########
examples/notebooks/beam-ml/bigtable_enrichment_transform.ipynb:
##########
@@ -509,15 +509,48 @@
         "id": "K41xhvmA5yQk"
       },
       "source": [
-        "To establish a client for the Bigtable enrichment handler, replace 
`<PROJECT_ID>`, `<INSTANCE_ID>`, and `<TABLE_ID>` with the appropriate values 
for those fields. The `row_key` variable is the field name from the input row 
that contains the row key to use when querying Bigtable.\n",
+        "Configure the `BigTableEnrichmentHandler` handler with the following 
required parameters:\n",
+        "\n",
+        "* `project_id`: the Google Cloud project ID for the Bigtable 
instance\n",
+        "* `instance_id`: the instance name of the Bigtable cluster\n",
+        "* `table_id`: the table ID of table containing relevant data\n",
+        "* `row_key`: The field name from the input row that contains the row 
key to use when querying Bigtable.\n",
         "\n",
-        "To convert a `string` type to a `byte` type or a `byte` type to a 
`string` type from Bigtable, you can configure additional options, such as 
[`app_profile_id`](https://cloud.google.com/bigtable/docs/app-profiles), 
[`row_filter`](https://cloud.google.com/python/docs/reference/bigtable/latest/row-filters),
 and 
[`encoding`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.bigtable.html#apache_beam.transforms.enrichment_handlers.bigtable.BigTableEnrichmentHandler:~:text=for%20more%20details.-,encoding,-(str)%20%E2%80%93%20encoding)
 type.\n",
+        "Optionally, to provide additional configuration to the 
`BigTableEnrichmentHandler` handler, see [module 
docs](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.bigtable.html#module-apache_beam.transforms.enrichment_handlers.bigtable)."
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "id": "yFMcaf8i7TbI"
+      },
+      "source": [
+        "**Note:** When exceptions occur, by default, the logging severity is 
set to warning 
([`ExceptionLevel.WARN`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.WARN)).
  To configure the severity to raise exceptions, set `exception_level` to 
[`ExceptionLevel.RAISE`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.RAISE).
 To ignore exceptions, set `exception_level` to 
[`ExceptionLevel.QUIET`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.QUIET).\n",
         "\n",
-        "The default `encoding` type is `utf-8`.\n",
+        "The following example demonstrates how to set exception level in 
`BigTableEnrichmentHandler`:\n",
         "\n",
-        "\n"
+        "```\n",
+        "bigtable_handler = 
BigTableEnrichmentHandler(project_id=PROJECT_ID,\n",
+        "                                             
instance_id=INSTANCE_ID,\n",
+        "                                             table_id=TABLE_ID,\n",
+        "                                             row_key=row_key,\n",
+        "                                             
exception_level=ExceptionLevel.RAISE)\n",
+        "```"
       ]
     },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "The key component of the Bigtable handler is the `row_key` parameter. 
The `row_key` represent the field in input schema (`beam.Row`) that contains 
the row key for a row in the table.\n",

Review Comment:
   ```suggestion
           "The `row_key` parameter represents the field in input schema 
(`beam.Row`) that contains the row key for a row in the table.\n",
   ```



##########
examples/notebooks/beam-ml/bigtable_enrichment_transform.ipynb:
##########
@@ -624,6 +640,44 @@
         "  return beam.Row(**enriched)"
       ]
     },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "The following example demonstrates the code needed to provide a 
lambda function for a custom join to the enrichment transform:\n",
+        "\n",
+        "```\n",
+        "with beam.Pipeline() as p:\n",
+        "  output = (p\n",
+        "            ...\n",
+        "            | \"Enrich with BigTable\" >> 
Enrichment(bigtable_handler, join_fn=custom_join)\n",
+        "            | \"RunInference\" >> RunInference(model_handler)\n",
+        "            ...\n",
+        "            )\n",
+        "```"
+      ],
+      "metadata": {
+        "id": "fe3bIclV1jZ5"
+      }
+    },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "Since the enrichment transform make API calls to the remote service, 
specify a timeout duration of 10 seconds using the timeout param:\n",

Review Comment:
   ```suggestion
           "Because the enrichment transform make API calls to the remote 
service, use the `timeout` parameter to specify a timeout duration of 10 
seconds:\n",
   ```



##########
examples/notebooks/beam-ml/bigtable_enrichment_transform.ipynb:
##########
@@ -509,15 +509,48 @@
         "id": "K41xhvmA5yQk"
       },
       "source": [
-        "To establish a client for the Bigtable enrichment handler, replace 
`<PROJECT_ID>`, `<INSTANCE_ID>`, and `<TABLE_ID>` with the appropriate values 
for those fields. The `row_key` variable is the field name from the input row 
that contains the row key to use when querying Bigtable.\n",
+        "Configure the `BigTableEnrichmentHandler` handler with the following 
required parameters:\n",
+        "\n",
+        "* `project_id`: the Google Cloud project ID for the Bigtable 
instance\n",
+        "* `instance_id`: the instance name of the Bigtable cluster\n",
+        "* `table_id`: the table ID of table containing relevant data\n",
+        "* `row_key`: The field name from the input row that contains the row 
key to use when querying Bigtable.\n",
         "\n",
-        "To convert a `string` type to a `byte` type or a `byte` type to a 
`string` type from Bigtable, you can configure additional options, such as 
[`app_profile_id`](https://cloud.google.com/bigtable/docs/app-profiles), 
[`row_filter`](https://cloud.google.com/python/docs/reference/bigtable/latest/row-filters),
 and 
[`encoding`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.bigtable.html#apache_beam.transforms.enrichment_handlers.bigtable.BigTableEnrichmentHandler:~:text=for%20more%20details.-,encoding,-(str)%20%E2%80%93%20encoding)
 type.\n",
+        "Optionally, to provide additional configuration to the 
`BigTableEnrichmentHandler` handler, see [module 
docs](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.bigtable.html#module-apache_beam.transforms.enrichment_handlers.bigtable)."
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "id": "yFMcaf8i7TbI"
+      },
+      "source": [
+        "**Note:** When exceptions occur, by default, the logging severity is 
set to warning 
([`ExceptionLevel.WARN`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.WARN)).
  To configure the severity to raise exceptions, set `exception_level` to 
[`ExceptionLevel.RAISE`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.RAISE).
 To ignore exceptions, set `exception_level` to 
[`ExceptionLevel.QUIET`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.QUIET).\n",
         "\n",
-        "The default `encoding` type is `utf-8`.\n",
+        "The following example demonstrates how to set exception level in 
`BigTableEnrichmentHandler`:\n",
         "\n",
-        "\n"
+        "```\n",
+        "bigtable_handler = 
BigTableEnrichmentHandler(project_id=PROJECT_ID,\n",
+        "                                             
instance_id=INSTANCE_ID,\n",
+        "                                             table_id=TABLE_ID,\n",
+        "                                             row_key=row_key,\n",
+        "                                             
exception_level=ExceptionLevel.RAISE)\n",
+        "```"
       ]
     },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "The key component of the Bigtable handler is the `row_key` parameter. 
The `row_key` represent the field in input schema (`beam.Row`) that contains 
the row key for a row in the table.\n",
+        "\n",
+        "As of Apache Beam version 2.54.0, if the table uses composite row 
keys, then you can:\n",
+        "* modify the input schema to contain the row key in the format 
required by Bigtable.\n",
+        "* use a custom enrichment handler ([example handler with composite 
row key 
support](https://gist.github.com/riteshghorse/21f4480c1c545ea01166e6bdf4c183e1))."

Review Comment:
   ```suggestion
           "* Use a custom enrichment handler. For more information, see the 
[example handler with composite row key 
support](https://gist.github.com/riteshghorse/21f4480c1c545ea01166e6bdf4c183e1)."
   ```



##########
examples/notebooks/beam-ml/bigtable_enrichment_transform.ipynb:
##########
@@ -509,15 +509,48 @@
         "id": "K41xhvmA5yQk"
       },
       "source": [
-        "To establish a client for the Bigtable enrichment handler, replace 
`<PROJECT_ID>`, `<INSTANCE_ID>`, and `<TABLE_ID>` with the appropriate values 
for those fields. The `row_key` variable is the field name from the input row 
that contains the row key to use when querying Bigtable.\n",
+        "Configure the `BigTableEnrichmentHandler` handler with the following 
required parameters:\n",
+        "\n",
+        "* `project_id`: the Google Cloud project ID for the Bigtable 
instance\n",
+        "* `instance_id`: the instance name of the Bigtable cluster\n",
+        "* `table_id`: the table ID of table containing relevant data\n",
+        "* `row_key`: The field name from the input row that contains the row 
key to use when querying Bigtable.\n",
         "\n",
-        "To convert a `string` type to a `byte` type or a `byte` type to a 
`string` type from Bigtable, you can configure additional options, such as 
[`app_profile_id`](https://cloud.google.com/bigtable/docs/app-profiles), 
[`row_filter`](https://cloud.google.com/python/docs/reference/bigtable/latest/row-filters),
 and 
[`encoding`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.bigtable.html#apache_beam.transforms.enrichment_handlers.bigtable.BigTableEnrichmentHandler:~:text=for%20more%20details.-,encoding,-(str)%20%E2%80%93%20encoding)
 type.\n",
+        "Optionally, to provide additional configuration to the 
`BigTableEnrichmentHandler` handler, see [module 
docs](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.bigtable.html#module-apache_beam.transforms.enrichment_handlers.bigtable)."
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "id": "yFMcaf8i7TbI"
+      },
+      "source": [
+        "**Note:** When exceptions occur, by default, the logging severity is 
set to warning 
([`ExceptionLevel.WARN`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.WARN)).
  To configure the severity to raise exceptions, set `exception_level` to 
[`ExceptionLevel.RAISE`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.RAISE).
 To ignore exceptions, set `exception_level` to 
[`ExceptionLevel.QUIET`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.QUIET).\n",
         "\n",
-        "The default `encoding` type is `utf-8`.\n",
+        "The following example demonstrates how to set exception level in 
`BigTableEnrichmentHandler`:\n",
         "\n",
-        "\n"
+        "```\n",
+        "bigtable_handler = 
BigTableEnrichmentHandler(project_id=PROJECT_ID,\n",
+        "                                             
instance_id=INSTANCE_ID,\n",
+        "                                             table_id=TABLE_ID,\n",
+        "                                             row_key=row_key,\n",
+        "                                             
exception_level=ExceptionLevel.RAISE)\n",
+        "```"
       ]
     },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "The key component of the Bigtable handler is the `row_key` parameter. 
The `row_key` represent the field in input schema (`beam.Row`) that contains 
the row key for a row in the table.\n",
+        "\n",
+        "As of Apache Beam version 2.54.0, if the table uses composite row 
keys, then you can:\n",

Review Comment:
   ```suggestion
           "Starting in Apache Beam version 2.54.0, if the table uses composite 
row keys, then you can do the following tasks:\n",
   ```



##########
examples/notebooks/beam-ml/bigtable_enrichment_transform.ipynb:
##########
@@ -562,13 +584,7 @@
       "source": [
         "## Use the enrichment transform\n",
         "\n",
-        "To use the [enrichment 
transform](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment.html#apache_beam.transforms.enrichment.Enrichment),
 the 
[`EnrichmentHandler`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment.html#apache_beam.transforms.enrichment.EnrichmentSourceHandler)
 parameter is required. You can also use a configuration parameter to specify a 
`lambda` for a join function, a timeout, a throttler, and a repeater (retry 
strategy).\n",
-        "\n",
-        "\n",
-        "*   `join_fn`: A lambda function that takes dictionaries as input and 
returns an enriched row (`Callable[[Dict[str, Any], Dict[str, Any]], 
beam.Row]`). The enriched row specifies how to join the data fetched from the 
API. Defaults to a 
[cross-join](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment.html#apache_beam.transforms.enrichment.cross_join).\n",
-        "*   `timeout`: The number of seconds to wait for the request to be 
completed by the API before timing out. Defaults to 30 seconds.\n",
-        "*   `throttler`: Specifies the throttling mechanism. The only 
supported option is default client-side adaptive throttling.\n",
-        "*   `repeater`: Specifies the retry strategy when errors like 
`TooManyRequests` and `TimeoutException` occur. Defaults to 
[`ExponentialBackOffRepeater`](https://beam.apache.org/releases/pydoc/current/apache_beam.io.requestresponse.html#apache_beam.io.requestresponse.ExponentialBackOffRepeater).\n"
+        "To use the [enrichment 
transform](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment.html#apache_beam.transforms.enrichment.Enrichment),
 only the enrichment handler parameter is required."

Review Comment:
   ```suggestion
           "To use the [enrichment 
transform](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment.html#apache_beam.transforms.enrichment.Enrichment),
 the enrichment handler parameter is the only required parameter."
   ```



##########
examples/notebooks/beam-ml/bigtable_enrichment_transform.ipynb:
##########
@@ -509,15 +509,48 @@
         "id": "K41xhvmA5yQk"
       },
       "source": [
-        "To establish a client for the Bigtable enrichment handler, replace 
`<PROJECT_ID>`, `<INSTANCE_ID>`, and `<TABLE_ID>` with the appropriate values 
for those fields. The `row_key` variable is the field name from the input row 
that contains the row key to use when querying Bigtable.\n",
+        "Configure the `BigTableEnrichmentHandler` handler with the following 
required parameters:\n",
+        "\n",
+        "* `project_id`: the Google Cloud project ID for the Bigtable 
instance\n",
+        "* `instance_id`: the instance name of the Bigtable cluster\n",
+        "* `table_id`: the table ID of table containing relevant data\n",
+        "* `row_key`: The field name from the input row that contains the row 
key to use when querying Bigtable.\n",
         "\n",
-        "To convert a `string` type to a `byte` type or a `byte` type to a 
`string` type from Bigtable, you can configure additional options, such as 
[`app_profile_id`](https://cloud.google.com/bigtable/docs/app-profiles), 
[`row_filter`](https://cloud.google.com/python/docs/reference/bigtable/latest/row-filters),
 and 
[`encoding`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.bigtable.html#apache_beam.transforms.enrichment_handlers.bigtable.BigTableEnrichmentHandler:~:text=for%20more%20details.-,encoding,-(str)%20%E2%80%93%20encoding)
 type.\n",
+        "Optionally, to provide additional configuration to the 
`BigTableEnrichmentHandler` handler, see [module 
docs](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.bigtable.html#module-apache_beam.transforms.enrichment_handlers.bigtable)."
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "id": "yFMcaf8i7TbI"
+      },
+      "source": [
+        "**Note:** When exceptions occur, by default, the logging severity is 
set to warning 
([`ExceptionLevel.WARN`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.WARN)).
  To configure the severity to raise exceptions, set `exception_level` to 
[`ExceptionLevel.RAISE`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.RAISE).
 To ignore exceptions, set `exception_level` to 
[`ExceptionLevel.QUIET`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.QUIET).\n",
         "\n",
-        "The default `encoding` type is `utf-8`.\n",
+        "The following example demonstrates how to set exception level in 
`BigTableEnrichmentHandler`:\n",
         "\n",
-        "\n"
+        "```\n",
+        "bigtable_handler = 
BigTableEnrichmentHandler(project_id=PROJECT_ID,\n",
+        "                                             
instance_id=INSTANCE_ID,\n",
+        "                                             table_id=TABLE_ID,\n",
+        "                                             row_key=row_key,\n",
+        "                                             
exception_level=ExceptionLevel.RAISE)\n",
+        "```"
       ]
     },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "The key component of the Bigtable handler is the `row_key` parameter. 
The `row_key` represent the field in input schema (`beam.Row`) that contains 
the row key for a row in the table.\n",
+        "\n",
+        "As of Apache Beam version 2.54.0, if the table uses composite row 
keys, then you can:\n",
+        "* modify the input schema to contain the row key in the format 
required by Bigtable.\n",

Review Comment:
   ```suggestion
           "* Modify the input schema to contain the row key in the format 
required by Bigtable.\n",
   ```



##########
examples/notebooks/beam-ml/bigtable_enrichment_transform.ipynb:
##########
@@ -624,6 +640,44 @@
         "  return beam.Row(**enriched)"
       ]
     },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "The following example demonstrates the code needed to provide a 
lambda function for a custom join to the enrichment transform:\n",

Review Comment:
   ```suggestion
           "To provide a `lambda` function for using a custom join with the 
enrichment transform, see the following example.\n",
   ```



##########
examples/notebooks/beam-ml/bigtable_enrichment_transform.ipynb:
##########
@@ -509,15 +509,48 @@
         "id": "K41xhvmA5yQk"
       },
       "source": [
-        "To establish a client for the Bigtable enrichment handler, replace 
`<PROJECT_ID>`, `<INSTANCE_ID>`, and `<TABLE_ID>` with the appropriate values 
for those fields. The `row_key` variable is the field name from the input row 
that contains the row key to use when querying Bigtable.\n",
+        "Configure the `BigTableEnrichmentHandler` handler with the following 
required parameters:\n",
+        "\n",
+        "* `project_id`: the Google Cloud project ID for the Bigtable 
instance\n",
+        "* `instance_id`: the instance name of the Bigtable cluster\n",
+        "* `table_id`: the table ID of table containing relevant data\n",
+        "* `row_key`: The field name from the input row that contains the row 
key to use when querying Bigtable.\n",
         "\n",
-        "To convert a `string` type to a `byte` type or a `byte` type to a 
`string` type from Bigtable, you can configure additional options, such as 
[`app_profile_id`](https://cloud.google.com/bigtable/docs/app-profiles), 
[`row_filter`](https://cloud.google.com/python/docs/reference/bigtable/latest/row-filters),
 and 
[`encoding`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.bigtable.html#apache_beam.transforms.enrichment_handlers.bigtable.BigTableEnrichmentHandler:~:text=for%20more%20details.-,encoding,-(str)%20%E2%80%93%20encoding)
 type.\n",
+        "Optionally, to provide additional configuration to the 
`BigTableEnrichmentHandler` handler, see [module 
docs](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.bigtable.html#module-apache_beam.transforms.enrichment_handlers.bigtable)."
+      ]
+    },
+    {
+      "cell_type": "markdown",
+      "metadata": {
+        "id": "yFMcaf8i7TbI"
+      },
+      "source": [
+        "**Note:** When exceptions occur, by default, the logging severity is 
set to warning 
([`ExceptionLevel.WARN`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.WARN)).
  To configure the severity to raise exceptions, set `exception_level` to 
[`ExceptionLevel.RAISE`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.RAISE).
 To ignore exceptions, set `exception_level` to 
[`ExceptionLevel.QUIET`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment_handlers.utils.html#apache_beam.transforms.enrichment_handlers.utils.ExceptionLevel.QUIET).\n",
         "\n",
-        "The default `encoding` type is `utf-8`.\n",
+        "The following example demonstrates how to set exception level in 
`BigTableEnrichmentHandler`:\n",
         "\n",
-        "\n"
+        "```\n",
+        "bigtable_handler = 
BigTableEnrichmentHandler(project_id=PROJECT_ID,\n",
+        "                                             
instance_id=INSTANCE_ID,\n",
+        "                                             table_id=TABLE_ID,\n",
+        "                                             row_key=row_key,\n",
+        "                                             
exception_level=ExceptionLevel.RAISE)\n",
+        "```"
       ]
     },
+    {
+      "cell_type": "markdown",
+      "source": [
+        "The key component of the Bigtable handler is the `row_key` parameter. 
The `row_key` represent the field in input schema (`beam.Row`) that contains 
the row key for a row in the table.\n",
+        "\n",
+        "As of Apache Beam version 2.54.0, if the table uses composite row 
keys, then you can:\n",
+        "* modify the input schema to contain the row key in the format 
required by Bigtable.\n",
+        "* use a custom enrichment handler ([example handler with composite 
row key 
support](https://gist.github.com/riteshghorse/21f4480c1c545ea01166e6bdf4c183e1))."

Review Comment:
   Should this link be pointing to your repo?



##########
examples/notebooks/beam-ml/bigtable_enrichment_transform.ipynb:
##########
@@ -601,9 +617,9 @@
         "id": "F-xjiP_pHWZr"
       },
       "source": [
-        "To make a prediction, use the following fields: `product_id`, 
`quantity`, `price`, `customer_id`, and `customer_location`. Retrieve the value 
of the `customer_location` field from Bigtable.\n",
+        "The enrichment transform performs a 
[`cross_join`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment.html#apache_beam.transforms.enrichment.cross_join)
 by default. To override this behavior, the transform accepts a `join_fn` 
lambda function. The lambda function takes two dictionaries as input and 
returns an enriched row.\n",
         "\n",
-        "Because the enrichment transform performs a 
[`cross_join`](https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.enrichment.html#apache_beam.transforms.enrichment.cross_join)
 by default, design the custom join to enrich the input data. This design 
ensures that the join includes only the specified fields."
+        "For our ecommerce use case, to make a prediction, it needs the 
following fields: `product_id`, `quantity`, `price`, `customer_id`, and 
`customer_location`. Design the custom join to enrich the input data such that 
the enriched row has these fields."

Review Comment:
   ```suggestion
           "For the ecommerce use case, to make a prediction, provide the 
following fields: `product_id`, `quantity`, `price`, `customer_id`, and 
`customer_location`. When you design the custom join to enrich the input data, 
the enriched row must include these fields."
   ```



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