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azure-kusto-spark

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Apache Spark Connector for Azure Kusto

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- build.yml
- release.yml
- - bug_report.md
  - feature_request.md
- - build.yml
  - release.yml
- pull_request_template.md
- - readme.md
- pom.xml
- scalastyle_config.xml
- stripDependencyReducedPom.xsl
- Authentication.md
- KustoSink.md
- KustoSource.md
- SKILL.md
- Spark-Kusto DataTypes mapping.md
- Troubleshooting-Flowchart.html
- Troubleshooting.md
- pom.xml
.gitignore
.scalafix.conf
.scalafmt.conf
CHANGELOG.md
kusto_spark.png
LICENSE
pom.xml
README.md
SECURITY.md
SKILL.md

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# Azure Data Explorer Connector for Apache Spark
  
master: [![Build](https://github.com/Azure/azure-kusto-spark/actions/workflows/build.yml/badge.svg?branch=master)](https://github.com/Azure/azure-kusto-spark/actions/workflows/build.yml)

This library contains the source code for Azure Data Explorer Data Source and Data Sink Connector for Apache Spark.

Azure Data Explorer (A.K.A. [Kusto](https://azure.microsoft.com/services/data-explorer/)) is a lightning-fast indexing and querying service.

[Spark](https://spark.apache.org/) is a unified analytics engine for large-scale data processing.

Making Azure Data Explorer and Spark work together enables building fast and scalable applications, targeting a variety of Machine Learning, Extract-Transform-Load, Log Analytics and other data-driven scenarios.

This connector works with the following spark environments:
[Azure Databricks](https://azure.microsoft.com/products/databricks),
[Azure Synapse Data Explorer](https://docs.microsoft.com/azure/synapse-analytics/data-explorer/data-explorer-overview) and
[Real time analytics in Fabric](https://learn.microsoft.com/fabric/real-time-analytics/overview)

## Changelog

**Breaking changes in versions 5.2.x** - From these versions, the published packages are shaded and packaged as a self contained jar. This is to avoid issues with common OSS libraries, spark runtimes and/or application dependencies.

For major changes from previous releases, please refer to [Releases](https://github.com/Azure/azure-kusto-spark/releases).
For known or new issues, please refer to the [issues](https://github.com/Azure/azure-kusto-spark/issues) section.
> Note: Use the 4.x series only if you are using JDK 11. Versions 3.x and 5.x will work with JDK8 and all versions up
From versions 5.2.0 and up, the connector is packaged as an uber jar to avoid conflicts with other jars that are added as part of the spark job definitions.

## Usage

### Linking

Starting version 2.3.0, we introduce new artifact Ids: `kusto-spark_3.x_2.12` targeting Spark 3.x and Scala 2.12 
and `kusto-spark_2.4_2.11` targeting Spark 2.4.x and scala 2.11. The latter is built from branch "2.4".
For Scala/Java applications using Maven project definitions, 
link your application with the artifact below to use the Azure Data Explorer Connector for Spark. 
> Note: Versions prior to 2.5.1 can no longer ingest to an existing table.

**In Maven**:

The Spark 3.x library is published at the following location [kusto-spark_3.0_2.12](https://mvnrepository.com/artifact/com.microsoft.azure.kusto/kusto-spark_3.0).

Or clone this repository and build it locally to add it to your local maven repository,.
The jar can also be found under the [released package](https://github.com/Azure/azure-kusto-spark/releases)

#### Building Samples Module
Samples are packaged as a separate module with the following artifact

```xml
<artifactId>connector-samples</artifactId>
```

To build the whole project comprised of the connector module and the samples module, 
use the following artifact:

```xml
<artifactId>azure-kusto-spark</artifactId>
```

## Build Prerequisites

To use the connector, you need:

- Java 1.8+ SDK installed
- [Maven 3.x](https://maven.apache.org/download.cgi) installed
- Spark - with the version aligned with the artifact ID (either 2.4 or 3.0)

> Note: when working with Spark version 2.3 or lower, build the jar locally from branch "2.4" and 
simply change the spark version in the pom file.

## Local Run - Build Setup

The newer options in the connector have tests pertaining to Blob storage, providing support for user impersonation based data export and also providing a custom blob storage for ingestion.

These are set up on the CI already. To configure these on local machines, set up is required on the machine. The following are commands to be executed on AzCli, the setup can be done through the Azure portal as well.

```
az login
az ad signed-in-user show --query "id" --output json
```
This will usually output a GUID

```
"10ac405f-8d3f-4f95-a012-201801b257d2"
```
This ID can then be used to grant access to storage as follows

```shell
az role assignment create --assignee 10ac405f-8d3f-4f95-a012-201801b257d2 --role "Storage Blob Delegator" --scope /subscriptions/<sub-id>/resourceGroups/<rg-name>/providers/Microsoft.Storage/storageAccounts/<storageacc>
 
az role assignment create --assignee 10ac405f-8d3f-4f95-a012-201801b257d2 --role "Storage Blob Data Contributor" --scope /subscriptions/<sub-id>/resourceGroups/<rg-name>/providers/Microsoft.Storage/storageAccounts/<storageacc>/containers/<container-name>
```

These commands will set up test storage accounts required for tests.

Once this is set up, you can use the following commands to build and run the tests

## Build Commands
   
```shell
mvn clean package -DkustoCluster='https://cluster.westus2.kusto.windows.net' -DkustoDatabase='spark' -DkustoAadAuthorityID='72f988bf-86f1-41af-91ab-2d7cd011db47'  -DkustoIngestionUri='https://ingest-cluster.westus2.kusto.windows.net' -DingestStorageUrl='https://storageacc.blob.core.windows.net' -DingestStorageContainer='ingestcontainer' -DstorageAccountUrl='https://storageacc.blob.core.windows.net/synapseppe\;impersonate'

# You can pass all the properties as env variables too
export kustoCluster="https://cluster.westus2.kusto.windows.net"

```

## Pre-Compiled Libraries
To facilitate ramp-up from local jar on platforms such as Azure Databricks, pre-compiled libraries
are published under [GitHub Releases](https://github.com/Azure/azure-kusto-spark/releases).
These libraries include:
* Azure Data Explorer connector library
* Version 5.2.0 and up of the library publish uber jars to maven. This is because of conflicts between custom jars that are added as part of the job and the exclude/include process that has to be followed to avoid conflicts.

## Dependencies
Spark Azure Data Explorer connector depends on [Azure Data Explorer Data Client Library](https://mvnrepository.com/artifact/com.microsoft.azure.kusto/kusto-data) 
and [Azure Data Explorer Ingest Client Library](https://mvnrepository.com/artifact/com.microsoft.azure.kusto/kusto-ingest), 
available in maven repository.
When [Key Vault based authentication](./docs/Authentication.md) is used, there is an additional dependency 
on [Microsoft Azure SDK For Key Vault](https://mvnrepository.com/artifact/com.microsoft.azure/azure-keyvault).

> **Note:** When working with JARs, Azure Data Explorer connector requires Azure Data Explorer Java client libraries (and azure key-vault library if used) to be installed.
To find the right version to install, [look in the relevant release's pom](https://github.com/Azure/azure-kusto-spark/releases))

## Documentation

Detailed documentation can be found [here](docs).

## Samples

Usage examples can be found [here](samples/src/main/scala)

# Available Azure Data Explorer client libraries:

Currently available client libraries for Azure Data Explorer:
- [Node](https://github.com/azure/azure-kusto-node)
- [Python](https://github.com/azure/azure-kusto-python)
- [.NET](https://docs.microsoft.com/azure/kusto/api/netfx/about-the-sdk)
- [Java](https://github.com/azure/azure-kusto-java)
- [Go](https://github.com/azure/azure-kusto-go)
   
For the comfort of the user, here is a [Pyspark sample](./samples/src/main/python/pyKusto.py) for the connector.

# Need Support?

- **Have a feature request for SDKs?** Please post it on [User Voice](https://feedback.azure.com/forums/915733-azure-data-explorer) to help us prioritize
- **Have a technical question?** Ask on [Stack Overflow with tag "azure-data-explorer"](https://stackoverflow.com/questions/tagged/azure-data-explorer)
- **Need Support?** Every customer with an active Azure subscription has access to [support](https://docs.microsoft.com/azure/azure-supportability/how-to-create-azure-support-request) with guaranteed response time. Consider submitting a ticket for assistance from the Microsoft support team.
- **Found a bug?** Please help us fix it by thoroughly documenting it and [filing an issue](https://github.com/Azure/azure-kusto-spark/issues/new).

# Contributing

This project welcomes contributions and suggestions. Most contributions require you to agree to a
Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us
the rights to use your contribution. For details, visit https://cla.microsoft.com.

When you submit a pull request, a CLA-bot will automatically determine whether you need to provide
a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the instructions
provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or
contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.

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