Mobius development is deprecated and has been superseded by a more recent version '.NET for Apache Spark' from Microsoft (Website, GitHub) that runs on Azure HDInsight Spark, Amazon EMR Spark, Azure & AWS Databricks.
Mobius: C# API for Spark
Mobius provides C# language binding to Apache Spark enabling the implementation of Spark driver program and data processing operations in the languages supported in the .NET framework like C# or F#.
For example, the word count sample in Apache Spark can be implemented in C# as follows :
var lines = sparkContext.TextFile(@"hdfs://path/to/input.txt");
var words = lines.FlatMap(s => s.Split(' '));
var wordCounts = words.Map(w => new Tuple<string, int>(w.Trim(), 1))
.ReduceByKey((x, y) => x + y);
var wordCountCollection = wordCounts.Collect();
wordCounts.SaveAsTextFile(@"hdfs://path/to/wordcount.txt");
A simple DataFrame application using TempTable may look like the following:
var reqDataFrame = sqlContext.TextFile(@"hdfs://path/to/requests.csv");
var metricDataFrame = sqlContext.TextFile(@"hdfs://path/to/metrics.csv");
reqDataFrame.RegisterTempTable("requests");
metricDataFrame.RegisterTempTable("metrics");
// C0 - guid in requests DataFrame, C3 - guid in metrics DataFrame
var joinDataFrame = GetSqlContext().Sql(
"SELECT joinedtable.datacenter" +
", MAX(joinedtable.latency) maxlatency" +
", AVG(joinedtable.latency) avglatency " +
"FROM (" +
"SELECT a.C1 as datacenter, b.C6 as latency " +
"FROM requests a JOIN metrics b ON a.C0 = b.C3) joinedtable " +
"GROUP BY datacenter");
joinDataFrame.ShowSchema();
joinDataFrame.Show();
A simple DataFrame application using DataFrame DSL may look like the following:
// C0 - guid, C1 - datacenter
var reqDataFrame = sqlContext.TextFile(@"hdfs://path/to/requests.csv")
.Select("C0", "C1");
// C3 - guid, C6 - latency
var metricDataFrame = sqlContext.TextFile(@"hdfs://path/to/metrics.csv", ",", false, true)
.Select("C3", "C6"); //override delimiter, hasHeader & inferSchema
var joinDataFrame = reqDataFrame.Join(metricDataFrame, reqDataFrame["C0"] == metricDataFrame["C3"])
.GroupBy("C1");
var maxLatencyByDcDataFrame = joinDataFrame.Agg(new Dictionary<string, string> { { "C6", "max" } });
maxLatencyByDcDataFrame.ShowSchema();
maxLatencyByDcDataFrame.Show();
A simple Spark Streaming application that processes messages from Kafka using C# may be implemented using the following code:
StreamingContext sparkStreamingContext = StreamingContext.GetOrCreate(checkpointPath, () =>
{
var ssc = new StreamingContext(sparkContext, slideDurationInMillis);
ssc.Checkpoint(checkpointPath);
var stream = KafkaUtils.CreateDirectStream(ssc, topicList, kafkaParams, perTopicPartitionKafkaOffsets);
//message format: [timestamp],[loglevel],[logmessage]
var countByLogLevelAndTime = stream
.Map(kvp => Encoding.UTF8.GetString(kvp.Value))
.Filter(line => line.Contains(","))
.Map(line => line.Split(','))
.Map(columns => new Tuple<string, int>(
string.Format("{0},{1}", columns[0], columns[1]), 1))
.ReduceByKeyAndWindow((x, y) => x + y, (x, y) => x - y,
windowDurationInSecs, slideDurationInSecs, 3)
.Map(logLevelCountPair => string.Format("{0},{1}",
logLevelCountPair.Key, logLevelCountPair.Value));
countByLogLevelAndTime.ForeachRDD(countByLogLevel =>
{
foreach (var logCount in countByLogLevel.Collect())
Console.WriteLine(logCount);
});
return ssc;
});
sparkStreamingContext.Start();
sparkStreamingContext.AwaitTermination();
For more code samples, refer to Mobius\examples directory or Mobius\csharp\Samples directory.
API Documentation
Refer to Mobius C# API documentation for the list of Spark's data processing operations supported in Mobius.
API Usage
Mobius API usage samples are available at:
-
Examples folder which contains standalone C# and F# projects that can be used as templates to start developing Mobius applications
-
Samples project which uses a comprehensive set of Mobius APIs to implement samples that are also used for functional validation of APIs
-
Mobius performance test scenarios implemented in C# and Scala for side by side comparison of Spark driver code
Documents
Refer to the docs folder for design overview and other info on Mobius
Build Status, Ubuntu 14.04.3 LTS, Windows, Unit test coverage, -------------------, :------:, :-----------------:, 
, 
, 
Getting Started, Windows, Linux, ---, :------, :----, Build & run unit tests, Build in Windows, Build in Linux, Run samples (functional tests) in local mode, Samples in Windows, Samples in Linux, Run examples in local mode, Examples in Windows, Examples in Linux, Run Mobius app, Standalone clusterYARN cluster, Linux clusterAzure HDInsight Spark ClusterAWS EMR Spark Cluster, Run Mobius Shell, LocalYARN, Not supported yet, ### Useful Links
- Configuration parameters in Mobius
- Troubleshoot errors in Mobius
- Debug Mobius apps
- Implementing Spark Apps in F# using Mobius
Supported Spark Versions
Mobius is built and tested with Apache Spark 1.4.1, 1.5.2, 1.6.* and 2.0.
Releases
Mobius releases are available at https://github.com/Microsoft/Mobius/releases. References needed to build C# Spark driver applicaiton using Mobius are also available in NuGet
Refer to mobius-release-info.md for the details on versioning policy and the contents of the release.
License
Mobius is licensed under the MIT license. See LICENSE file for full license information.
Community
-
Mobius project welcomes contributions. To contribute, follow the instructions in CONTRIBUTING.md
-
Options to ask your question to the Mobius community
- create issue on GitHub
- create post with "sparkclr" tag in Stack Overflow
- join chat at Mobius room in Gitter
- tweet @MobiusForSpark
Code of Conduct
This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.
