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-# lakefs-iceberg-catalog
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+<img src="https://docs.lakefs.io/assets/logo.svg" alt="lakeFS logo" width=300/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<img src="https://www.apache.org/logos/res/iceberg/iceberg.png" alt="Apache Iceberg logo" width=300/>
+
+## lakeFS Iceberg Catalog
+
+lakeFS enriches your Iceberg tables with Git capabilities: create a branch and make your changes in isolation, without affecting other team members.
+
+See the instructions below on build, configuration and usage
+
+## Build
+
+From the repository root run the following maven command
+
+```sh
+mvn clean install -U -DskipTests
+```
+
+Under the `target` directory you will find the jar:
+
+`lakefs-iceberg-catalog-<version>.jar`
+
+Load this jar into your environment.
+
+## Configuration
+
+lakeFS Catalog is using lakeFS HadoopFileSystem under the hood to interact with lakeFS.
+In addition, for better performance we configure the S3A FS to interact directly with the underlying storage:
+
+```scala
+conf.set("spark.hadoop.fs.lakefs.impl", "io.lakefs.LakeFSFileSystem")
+conf.set("spark.hadoop.fs.lakefs.access.key", "AKIAIOSFDNN7EXAMPLEQ")
+conf.set("spark.hadoop.fs.lakefs.secret.key", "wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY")
+conf.set("spark.hadoop.fs.lakefs.endpoint", "http://localhost:8000/api/v1")
+conf.set("spark.hadoop.fs.s3a.access.key", "<your-aws-access-key>")
+conf.set("spark.hadoop.fs.s3a.secret.key", "<your-aws-secret-key>")
+```
+
+In the catalog configuration pass the lakefs FS scheme configured previously as the warehouse location
+
+```scala
+conf.set("spark.sql.catalog.lakefs", "org.apache.iceberg.spark.SparkCatalog")
+conf.set("spark.sql.catalog.lakefs.catalog-impl", "io.lakefs.iceberg.LakeFSCatalog")
+conf.set("spark.sql.catalog.lakefs.warehouse", "lakefs://")
+```
+
+## Usage
+
+For our examples, assume lakeFS repository called `myrepo`.
+
+### Create a table
+
+Let's create a table called `table1` under `main` branch and namespace `name.space.`
+To create the table, use the following syntax:
+
+```sql
+CREATE TABLE lakefs.myrepo.main.name.space.table1 (id int, data string);
+```
+
+### Create a branch
+
+We will create a new branch `dev` from `main`, but first lets commit the creation of the table to the main branch:
+
+```
+lakectl commit lakefs://myrepo/main -m "my first iceberg commit"
+```
+
+To create a new branch:
+
+```
+lakectl branch create lakefs://myrepo/dev -s lakefs://myrepo/main
+```
+
+### Make changes on the branch
+
+We can now make changes on `dev` branch:
+
+```sql
+INSERT INTO lakefs.myrepo.dev.name.space.table1 VALUES (3, 'data3');
+```
+
+### Query the table
+
+If we query the table on the `dev` branch, we will see the data we inserted:
+
+```sql
+SELECT * FROM lakefs.myrepo.dev.name.space.table1;
+```
+
+Results in:
+```
++----+------+
+| id | data |
++----+------+
+| 1  | data1|
+| 2  | data2|
+| 3  | data3|
++----+------+
+```
+
+However, data on the `main` branch remains unaffected:
+
+```sql
+SELECT * FROM lakefs.myrepo.main.name.space.table1;
+```
+
+Results in:
+```
++----+------+
+| id | data |
++----+------+
+| 1  | data1|
+| 2  | data2|
++----+------+
+```