- Spark 1.3+
- This SDK supports interaction with Aliyun's base service, e.g. OSS, ODPS, LogService and ONS, in Spark runtime environment.
git clone https://github.com/aliyun/aliyun-spark-sdk.git
cd aliyun-spark-sdk
mvn clean package -DskipTests
- copy sdk jar to your project
- right click Eclipse project -> Properties -> Java Build Path -> Add JARs
- choose and import the sdk
- you can use the sdk in your Eclipse project
<dependency>
<groupId>com.aliyun.emr</groupId>
<artifactId>emr-maxcompute_2.11</artifactId>
<version>1.7.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.aliyun.emr</groupId>
<artifactId>emr-logservice_2.11</artifactId>
<version>1.7.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.aliyun.emr</groupId>
<artifactId>emr-tablestore</artifactId>
<version>1.7.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.aliyun.emr</groupId>
<artifactId>emr-ons_2.11</artifactId>
<version>1.7.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.aliyun.emr</groupId>
<artifactId>emr-mns_2.11</artifactId>
<version>1.7.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.aliyun.emr</groupId>
<artifactId>emr-oss</artifactId>
<version>1.7.0-SNAPSHOT</version>
</dependency>
In this section, we will demonstrate how to manipulate the Aliyun OSS data in Spark.
A native way to read and write regular files on Aliyun OSS. The advantage of this way is you can access files on OSS that came from other Aliyun base service or other tools. But file in Aliyun OSS has 48.8TB limit.
- oss://bucket/object/path
We can set OSS "AccessKeyId/AccessKeySecret/Endpoint" in Hadoop configuration:
<property>
<name>fs.oss.accessKeyId</name>
<description>Aliyun access key ID</description>
</property>
<property>
<name>fs.oss.accessKeySecret</name>
<description>Aliyun access key secret</description>
</property>
<property>
<name>fs.oss.endpoint</name>
<description>Aliyun OSS endpoint to connect to. An up-to-date list is
provided in the Aliyun OSS Documentation.
</description>
</property>
Specifically, we should add a prefix "spark.hadoop" in Spark, like "spark.hadoop.fs.oss.accessKeyId".
Now, we provide a transparent way to support Aliyun OSS, with no code changes and just few configurations. All you need to do is just to provide two configuations in your project:
conf.set("spark.hadoop.fs.oss.impl", "com.aliyun.fs.oss.nat.NativeOssFileSystem")
Then, you can load OSS data through SparkContext.textFile(...), like:
val conf = new SparkConf()
conf.set("spark.hadoop.fs.oss.impl", "com.aliyun.fs.oss.nat.NativeOssFileSystem")
val sc = new SparkContext(conf)
val path = "oss://bucket/input"
val rdd = sc.textFile(path)
Similarly, you can upload data through RDD.saveAsTextFile(...), like:
val data = sc.parallelize(1 to 10)
data.saveAsTextFile("oss://bucket/output")
In this section, we will demonstrate how to manipulate the Aliyun ODPS data in Spark.
Before read/write ODPS data, we need to initialize an OdpsOps, like:
import com.aliyun.odps.TableSchema
import com.aliyun.odps.data.Record
import org.apache.spark.aliyun.odps.OdpsOps
import org.apache.spark.{SparkContext, SparkConf}
object Sample {
def main(args: Array[String]): Unit = {
// == Step-1 ==
val accessKeyId = "<accessKeyId>"
val accessKeySecret = "<accessKeySecret>"
// intranet endpoints for example
val urls = Seq("http://odps-ext.aliyun-inc.com/api", "http://dt-ext.odps.aliyun-inc.com")
val conf = new SparkConf().setAppName("Spark Odps Sample")
val sc = new SparkContext(conf)
val odpsOps = OdpsOps(sc, accessKeyId, accessKeySecret, urls(0), urls(1))
// == Step-2 ==
...
// == Step-3 ==
...
}
// == Step-2 ==
// function definition
// == Step-3 ==
// function definition
｝
In above codes, the variables accessKeyId and accessKeySecret are assigned to users by system; they are named as ID pair, and used for user identification and signature authentication for OSS access. See Aliyun AccessKeys for more information.
// == Step-2 ==
val project = <odps-project>
val table = <odps-table>
val numPartitions = 2
val inputData = odpsOps.readTable(project, table, read, numPartitions)
inputData.top(10).foreach(println)
// == Step-3 ==
...
In above codes, we need to define a read function to pre-process ODPS data：
def read(record: Record, schema: TableSchema): String = {
record.getString(0)
}
It means to load ODPS table's first column into Spark.
val resultData = inputData.map(e => s"$e has been processed.")
odpsOps.saveToTable(project, table, resultData, write)
In above codes, we need to define a write function to preprocess reslult data before write odps table：
def write(s: String, emptyReord: Record, schema: TableSchema): Unit = {
val r = emptyReord
r.set(0, s)
}
It means to write each line of result RDD into the first column of ODPS table.
In this section, we will demonstrate how to consume ONS message in Spark.
// cId: Aliyun ONS ConsumerID
// topic: Message Topic
// subExpression: Message Tag
val Array(cId, topic, subExpression, parallelism, interval) = args
val accessKeyId = "accessKeyId"
val accessKeySecret = "accessKeySecret"
val numStreams = parallelism.toInt
val batchInterval = Milliseconds(interval.toInt)
val conf = new SparkConf().setAppName("Spark ONS Sample")
val ssc = new StreamingContext(conf, batchInterval)
// define `func` to preprocess each message
def func: Message => Array[Byte] = msg => msg.getBody
val onsStreams = (0 until numStreams).map { i =>
println(s"starting stream $i")
OnsUtils.createStream(
ssc,
cId,
topic,
subExpression,
accessKeyId,
accessKeySecret,
StorageLevel.MEMORY_AND_DISK_2,
func)
}
val unionStreams = ssc.union(onsStreams)
unionStreams.foreachRDD(rdd => {
rdd.map(bytes => new String(bytes)).flatMap(line => line.split(" "))
.map(word => (word, 1))
.reduceByKey(_ + _).collect().foreach(e => println(s"word: ${e._1}, cnt: ${e._2}"))
})
ssc.start()
ssc.awaitTermination()
In this section, we will demonstrate how to consume Loghub data in Spark Streaming.
if (args.length < 8) {
System.err.println(
"""Usage: TestLoghub <sls project> <sls logstore> <loghub group name> <sls endpoint> <access key id>
| <access key secret> <receiver number> <batch interval seconds>
""".stripMargin)
System.exit(1)
}
val logserviceProject = args(0) // The project name in your LogService.
val logStoreName = args(1) // The name of of logstream.
val loghubGroupName = args(2) // Processes with the same loghubGroupName will consume data of logstream together.
val loghubEndpoint = args(3) // API endpoint of LogService
val accessKeyId = args(4) // AccessKeyId
val accessKeySecret = args(5) // AccessKeySecret
val numReceivers = args(6).toInt
val batchInterval = Milliseconds(args(7).toInt * 1000)
val conf = new SparkConf().setAppName("Test Loghub")
val ssc = new StreamingContext(conf, batchInterval)
val loghubStream = LoghubUtils.createStream(
ssc,
loghubProject,
logStream,
loghubGroupName,
endpoint,
numReceivers,
accessKeyId,
accessKeySecret,
StorageLevel.MEMORY_AND_DISK)
loghubStream.foreachRDD(rdd => println(rdd.count()))
ssc.start()
ssc.awaitTermination()
Licensed under the Apache License 2.0
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