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41 changes: 41 additions & 0 deletions NOTICE
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Apache Spark
Copyright 2014 and onwards The Apache Software Foundation.

This product includes software developed at
The Apache Software Foundation (http://www.apache.org/).


Export Control Notice
---------------------

This distribution includes cryptographic software. The country in which you currently reside may have
restrictions on the import, possession, use, and/or re-export to another country, of encryption software.
BEFORE using any encryption software, please check your country's laws, regulations and policies concerning
the import, possession, or use, and re-export of encryption software, to see if this is permitted. See
<http://www.wassenaar.org/> for more information.

The U.S. Government Department of Commerce, Bureau of Industry and Security (BIS), has classified this
software as Export Commodity Control Number (ECCN) 5D002.C.1, which includes information security software
using or performing cryptographic functions with asymmetric algorithms. The form and manner of this Apache
Software Foundation distribution makes it eligible for export under the License Exception ENC Technology
Software Unrestricted (TSU) exception (see the BIS Export Administration Regulations, Section 740.13) for
both object code and source code.

The following provides more details on the included cryptographic software:

This software uses Apache Commons Crypto (https://commons.apache.org/proper/commons-crypto/) to
support authentication, and encryption and decryption of data sent across the network between
services.


Metrics
Copyright 2010-2013 Coda Hale and Yammer, Inc.

This product includes software developed by Coda Hale and Yammer, Inc.

This product includes code derived from the JSR-166 project (ThreadLocalRandom, Striped64,
LongAdder), which was released with the following comments:

Written by Doug Lea with assistance from members of JCP JSR-166
Expert Group and released to the public domain, as explained at
http://creativecommons.org/publicdomain/zero/1.0/
105 changes: 105 additions & 0 deletions README.md
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# Shuffle Plugin for Apache Spark and S3 compatible storage services

This plugin allows storing [Apache Spark](https://spark.apache.org/) shuffle data on S3 compatible object storage (e.g. S3A, COS).
It uses the Java Hadoop-Filesystem abstraction for interoperability for COS, S3A and even local file systems.

*Note*: This plugin is based on [Apache Spark Pull Request #34864](https://github.com/apache/spark/pull/34864/files). It has
since been significantly rewritten.

## Known bugs

TeraSort results appear unsorted if the size bigger than 1g and `spark.shuffle.s3.forceBypassMergeSort=false`.

## Building

```bash
mvn -DskipTests clean package
```

## Configuration options

- `spark.shuffle.s3.rootDir`: Root dir for the shuffle files *required*. Examples:
- `s3a://zrlio-tmp/s3-benchmark-shuffle` (Hadoop-AWS + AWS-SDK)
- `cos://zrlio-tmp.resources/s3-benchmark-shuffle` (Hadoop-Cloud + Stocator)

The plugin will create an additional path based on the start time and the Spark app id.
- `spark.shuffle.s3.supportsUnbuffer`: Streams can be unbuffered instead of closed (default: `true`,
if Storage-backend is S3A, `false` otherwise).
- `spark.shuffle.s3.forceBypassMergeSort`: Bypass merge sort (default: `false`)

### Debug options / optimizations

- `spark.shuffle.s3.cleanup`: Cleanup the shuffle files (default: `true`)
- `spark.shuffle.s3.alwaysCreateIndex`: Always create an index file, even if all partitions have empty length (
default: `false`)
- `spark.shuffle.s3.useBlockManager`: Use the Spark block manager to compute blocks (default: `true`). Note: Disabling
this feature might lead to invalid results for some workloads.
- `spark.shuffle.s3.forceBatchFetch`: Force batch fetch for Shuffle Blocks (default: `false`)

## Testing

The tests requires the following environment variables to be set:
- `AWS_ACCESS_KEY_ID`: Access key to use for the S3 Shuffle service.
- `AWS_SECRET_ACCESS_KEY`: Secret key to use for the S3 Shuffle service.
- `S3_ENDPOINT_URL`: Endpoint URL of the S3 Service (e.g. `http://10.40.0.29:9000` or
`https://s3.direct.us-south.cloud-object-storage.appdomain.cloud`).
- `S3_ENDPOINT_USE_SSL`: Whether the endpoint supports SSL or not.
- `S3_SHUFFLE_ROOT`: The shuffle root (e.g `s3a://zrlio-tmp/S3ShuffleManagerTests`)

## Usage

Copy one of the following files to your spark path:

- `spark-s3-shuffle_2.12-1.0-SNAPSHOT-jar-with-dependencies.jar`
- `spark-s3-shuffle_2.12-1.0-SNAPSHOT.jar`

### With S3 Plugin

Add the following lines to your Spark configuration:

- `S3A_ACCESS_KEY`: S3 access key.
- `S3A_SECRET_KEY`: S3 secret key.
- `S3A_ENDPOINT`: The S3 endpoint e.g. `http://10.40.0.29:9000`
- `SHUFFLE_ROOT`: The Shuffle root for the shuffle plugin e.g. `s3a://zrlio-tmp/s3-benchmark-shuffle`.

```
--conf spark.hadoop.fs.s3a.access.key=S3A_ACCESS_KEY
--conf spark.hadoop.fs.s3a.secret.key=S3A_SECRET_KEY
--conf spark.hadoop.fs.s3a.connection.ssl.enabled=false # Optional if https is not enabled.
--conf spark.hadoop.fs.s3a.endpoint=S3A_ENDPOINT
--conf spark.hadoop.fs.s3a.path.style.access=true
--conf spark.hadoop.fs.s3a.fast.upload=true
--conf spark.shuffle.manager="org.apache.spark.shuffle.sort.S3ShuffleManager"
--conf spark.hadoop.fs.s3a.impl="org.apache.hadoop.fs.s3a.S3AFileSystem"
--conf spark.shuffle.s3.rootDir=SHUFFLE_ROOT
```

**Optional**: Manually add the AWS SDK if you want to use `spark-s3-shuffle_2.12-1.0-SNAPSHOT.jar`:

```
--conf spark.driver.extraClassPath='/opt/spark/jars/aws-java-sdk-bundle-1.11.375.jar,/opt/spark/jars/hadoop-aws-3.2.0.jar'
--conf spark.executor.extraClassPath='/opt/spark/jars/aws-java-sdk-bundle-1.11.375.jar,/opt/spark/jars/hadoop-aws-3.2.0.jar'
```

### With COS/Stocator Plugin

- `COS_ACCESS_KEY`: The key to access COS.
- `COS_SECRET_KEY`: The secret key to COS.
- `COS_ENDPOINT`: The COS endpoint e.g. `https://s3.direct.us-south.cloud-object-storage.appdomain.cloud`
- `SHUFFLE_ROOT`: The root dir for shuffle `cos://zrlio-tmp/s3-benchmark-shuffle`

```
--conf spark.hadoop.fs.s3a.fast.upload=true
--conf spark.hadoop.fs.cos.flat.list=false
--conf spark.hadoop.fs.stocator.scheme.list=cos
--conf spark.hadoop.fs.stocator.cos.scheme=cos
--conf spark.hadoop.fs.stocator.cos.impl=com.ibm.stocator.fs.cos.COSAPIClient
--conf spark.hadoop.fs.cos.impl=com.ibm.stocator.fs.ObjectStoreFileSystem
--conf spark.hadoop.fs.cos.resources.access.key=COS_ACCESS_KEY
--conf spark.hadoop.fs.cos.resources.endpoint=COS_ENDPOINT
--conf spark.hadoop.fs.cos.resources.secret.key=COS_SECRET_KEY
--conf spark.shuffle.manager="org.apache.spark.shuffle.sort.S3ShuffleManager"
--conf spark.shuffle.s3.rootDir=SHUFFLE_ROOT
```

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