|NO.Z.00067|——————————|^^ 重要 ^^|——|Hadoop&Spark.V05|——|Spark.v05|Spark Streaming|与kafka整合|Redis管理Offse|
一、Redis管理的Offset
### --- 要想将Offset保存到外部存储中,关键要实现以下几个功能:
~~~ Streaming程序启动时,从外部存储获取保存的Offsets(执行一次)
~~~ 在foreachRDD中,每个批次数据处理之后,更新外部存储的offsets(多次执行)
### --- 在pom.xml文件引入依赖
<!-- jedis -->
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.9.0</version>
</dependency>
二、编程实现:自定义offsets:使用自定义的offsets,从kafka读数据;处理完数据后打印offsets
### --- Redis管理的Offsets:
~~~ 数据结构选择:Hash;key、field、value
~~~ 从 Redis 中获取保存的offsets
~~~ 消费数据后将offsets保存到redis
Key:kafka:topic:TopicName:groupid
Field:partition
Value:offset
### --- 编程实现:
package cn.yanqi.kafka
import org.apache.kafka.clients.consumer.{ConsumerConfig, ConsumerRecord}
import org.apache.kafka.common.TopicPartition
import org.apache.kafka.common.serialization.StringDeserializer
import org.apache.log4j.{Level, Logger}
import org.apache.spark.{SparkConf, TaskContext}
import org.apache.spark.streaming.dstream.InputDStream
import org.apache.spark.streaming.kafka010.{ConsumerStrategies, HasOffsetRanges, KafkaUtils, LocationStrategies, OffsetRange}
import org.apache.spark.streaming.{Seconds, StreamingContext}
object KafkaDStream2 {
def main(args: Array[String]): Unit = {
// 初始化
Logger.getLogger("org").setLevel(Level.ERROR)
val conf = new SparkConf().setAppName("FileDStream").setMaster("local[*]")
val ssc = new StreamingContext(conf, Seconds(5))
// 定义kafka相关参数
val groupId: String = "mygroup01"
val topics: Array[String] = Array("topicB")
val kafkaParams: Map[String, Object] = getKafkaConsumerParameters(groupId)
val offsets: Map[TopicPartition, Long] = Map(
new TopicPartition("topicB", 0) -> 1000,
new TopicPartition("topicB", 1) -> 1000,
new TopicPartition("topicB", 2) -> 1000
)
// 创建DStream
val dstream: InputDStream[ConsumerRecord[String, String]] = KafkaUtils.createDirectStream(
ssc,
LocationStrategies.PreferConsistent,
ConsumerStrategies.Subscribe[String, String](topics, kafkaParams, offsets)
)
// DStream转换&输出
dstream.foreachRDD{ (rdd, time) =>
// 处理消息
println(s"*********** rdd.count = ${rdd.count()}; time = $time *************")
// 显示offsets的信息
val offsetRanges: Array[OffsetRange] = rdd.asInstanceOf[HasOffsetRanges].offsetRanges
rdd.foreachPartition{ iter =>
val range: OffsetRange = offsetRanges(TaskContext.get.partitionId)
println(s"${range.topic} ${range.partition} ${range.fromOffset} ${range.untilOffset} ")
}
}
// 启动作业
ssc.start()
ssc.awaitTermination()
}
def getKafkaConsumerParameters(groupid: String): Map[String, Object] = {
Map[String, Object](
ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG -> "hadoop01:9092,hadoop02:9092,hadoop03:9092",
ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG -> classOf[StringDeserializer],
ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG -> classOf[StringDeserializer],
ConsumerConfig.GROUP_ID_CONFIG -> groupid,
ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG -> (false: java.lang.Boolean)
// ConsumerConfig.AUTO_OFFSET_RESET_CONFIG -> "earliest"
)
}
}
### --- 编译打印
D:\JAVA\jdk1.8.0_231\bin\java.exe "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=53242:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath 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rmat\2.4.0\parquet-format-2.4.0.jar;C:\Users\Administrator\.m2\repository\org\apache\parquet\parquet-jackson\1.10.1\parquet-jackson-1.10.1.jar;C:\Users\Administrator\.m2\repository\org\apache\arrow\arrow-vector\0.10.0\arrow-vector-0.10.0.jar;C:\Users\Administrator\.m2\repository\org\apache\arrow\arrow-format\0.10.0\arrow-format-0.10.0.jar;C:\Users\Administrator\.m2\repository\org\apache\arrow\arrow-memory\0.10.0\arrow-memory-0.10.0.jar;C:\Users\Administrator\.m2\repository\com\carrotsearch\hppc\0.7.2\hppc-0.7.2.jar;C:\Users\Administrator\.m2\repository\com\vlkan\flatbuffers\1.2.0-3f79e055\flatbuffers-1.2.0-3f79e055.jar;C:\Users\Administrator\.m2\repository\joda-time\joda-time\2.9.7\joda-time-2.9.7.jar;C:\Users\Administrator\.m2\repository\mysql\mysql-connector-java\5.1.44\mysql-connector-java-5.1.44.jar;C:\Users\Administrator\.m2\repository\org\apache\spark\spark-hive_2.12\2.4.5\spark-hive_2.12-2.4.5.jar;C:\Users\Administrator\.m2\repository\com\twitter\parquet-hadoop-bundle\1.6.0\parquet-hadoop-bundle-1.6.0.jar;C:\Users\Administrator\.m2\repository\org\spark-project\hive\hive-exec\1.2.1.spark2\hive-exec-1.2.1.spark2.jar;C:\Users\Administrator\.m2\repository\commons-io\commons-io\2.4\commons-io-2.4.jar;C:\Users\Administrator\.m2\repository\javolution\javolution\5.5.1\javolution-5.5.1.jar;C:\Users\Administrator\.m2\repository\log4j\apache-log4j-extras\1.2.17\apache-log4j-extras-1.2.17.jar;C:\Users\Administrator\.m2\repository\org\antlr\antlr-runtime\3.4\antlr-runtime-3.4.jar;C:\Users\Administrator\.m2\repository\org\antlr\stringtemplate\3.2.1\stringtemplate-3.2.1.jar;C:\Users\Administrator\.m2\repository\antlr\antlr\2.7.7\antlr-2.7.7.jar;C:\Users\Administrator\.m2\repository\org\antlr\ST4\4.0.4\ST4-4.0.4.jar;C:\Users\Administrator\.m2\repository\com\googlecode\javaewah\JavaEWAH\0.3.2\JavaEWAH-0.3.2.jar;C:\Users\Administrator\.m2\repository\org\iq80\snappy\snappy\0.2\snappy-0.2.jar;C:\Users\Administrator\.m2\repository\stax\stax-api\1.0.1\stax-api-1.0.1.jar;C:\Users\Administrator\.m2\repository\net\sf\opencsv\opencsv\2.3\opencsv-2.3.jar;C:\Users\Administrator\.m2\repository\org\spark-project\hive\hive-metastore\1.2.1.spark2\hive-metastore-1.2.1.spark2.jar;C:\Users\Administrator\.m2\repository\com\jolbox\bonecp\0.8.0.RELEASE\bonecp-0.8.0.RELEASE.jar;C:\Users\Administrator\.m2\repository\commons-cli\commons-cli\1.2\commons-cli-1.2.jar;C:\Users\Administrator\.m2\repository\commons-logging\commons-logging\1.1.3\commons-logging-1.1.3.jar;C:\Users\Administrator\.m2\repository\org\datanucleus\datanucleus-api-jdo\3.2.6\datanucleus-api-jdo-3.2.6.jar;C:\Users\Administrator\.m2\repository\org\datanucleus\datanucleus-rdbms\3.2.9\datanucleus-rdbms-3.2.9.jar;C:\Users\Administrator\.m2\repository\commons-pool\commons-pool\1.5.4\commons-pool-1.5.4.jar;C:\Users\Administrator\.m2\repository\commons-dbcp\commons-dbcp\1.4\commons-dbcp-1.4.jar;C:\Users\Administrator\.m2\repository\javax\jdo\jdo-api\3.0.1\jdo-api-3.0.1.jar;C:\Users\Administrator\.m2\repository\javax\transaction\jta\1.1\jta-1.1.jar;C:\Users\Administrator\.m2\repository\commons-httpclient\commons-httpclient\3.1\commons-httpclient-3.1.jar;C:\Users\Administrator\.m2\repository\org\apache\calcite\calcite-avatica\1.2.0-incubating\calcite-avatica-1.2.0-incubating.jar;C:\Users\Administrator\.m2\repository\org\apache\calcite\calcite-core\1.2.0-incubating\calcite-core-1.2.0-incubating.jar;C:\Users\Administrator\.m2\repository\org\apache\calcite\calcite-linq4j\1.2.0-incubating\calcite-linq4j-1.2.0-incubating.jar;C:\Users\Administrator\.m2\repository\net\hydromatic\eigenbase-properties\1.1.5\eigenbase-properties-1.1.5.jar;C:\Users\Administrator\.m2\repository\org\apache\httpcomponents\httpclient\4.5.6\httpclient-4.5.6.jar;C:\Users\Administrator\.m2\repository\org\apache\httpcomponents\httpcore\4.4.10\httpcore-4.4.10.jar;C:\Users\Administrator\.m2\repository\org\codehaus\jackson\jackson-mapper-asl\1.9.13\jackson-mapper-asl-1.9.13.jar;C:\Users\Administrator\.m2\repository\commons-codec\commons-codec\1.10\commons-codec-1.10.jar;C:\Users\Administrator\.m2\repository\org\jodd\jodd-core\3.5.2\jodd-core-3.5.2.jar;C:\Users\Administrator\.m2\repository\org\datanucleus\datanucleus-core\3.2.10\datanucleus-core-3.2.10.jar;C:\Users\Administrator\.m2\repository\org\apache\thrift\libthrift\0.9.3\libthrift-0.9.3.jar;C:\Users\Administrator\.m2\repository\org\apache\thrift\libfb303\0.9.3\libfb303-0.9.3.jar;C:\Users\Administrator\.m2\repository\org\apache\derby\derby\10.12.1.1\derby-10.12.1.1.jar;C:\Users\Administrator\.m2\repository\org\apache\spark\spark-streaming_2.12\2.4.5\spark-streaming_2.12-2.4.5.jar;C:\Users\Administrator\.m2\repository\org\apache\spark\spark-streaming-kafka-0-10_2.12\2.4.5\spark-streaming-kafka-0-10_2.12-2.4.5.jar;C:\Users\Administrator\.m2\repository\org\apache\kafka\kafka-clients\2.0.0\kafka-clients-2.0.0.jar;C:\Users\Administrator\.m2\repository\redis\clients\jedis\2.9.0\jedis-2.9.0.jar;C:\Users\Administrator\.m2\repository\org\apache\commons\commons-pool2\2.4.2\commons-pool2-2.4.2.jar cn.yanqi.kafka.KafkaDStream3
Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
三、编程实现redis工具类
### --- 工具类(Redis读取/保存offsets)
package cn.yanqi.kafka
import java.util
import org.apache.kafka.common.TopicPartition
import org.apache.spark.streaming.kafka010.OffsetRange
import redis.clients.jedis.{Jedis, JedisPool, JedisPoolConfig}
import scala.collection.mutable
object OffsetsWithRedisUtils {
// 定义Redis参数
private val redisHost = "hadoop03"
private val redisPort = 6379
// 获取Redis的连接
private val config = new JedisPoolConfig
// 最大空闲数
config.setMaxIdle(5)
// 最大连接数
config.setMaxTotal(10)
private val pool = new JedisPool(config, redisHost, redisPort, 10000)
private def getRedisConnection: Jedis = pool.getResource
private val topicPrefix = "kafka:topic"
// Key:kafka:topic:TopicName:groupid
private def getKey(topic: String, groupid: String) = s"$topicPrefix:$topic:$groupid"
// 根据 key 获取offsets
def getOffsetsFromRedis(topics: Array[String], groupId: String): Map[TopicPartition, Long] = {
val jedis: Jedis = getRedisConnection
val offsets: Array[mutable.Map[TopicPartition, Long]] = topics.map { topic =>
val key = getKey(topic, groupId)
import scala.collection.JavaConverters._
jedis.hgetAll(key)
.asScala
.map { case (partition, offset) => new TopicPartition(topic, partition.toInt) -> offset.toLong }
}
// 归还资源
jedis.close()
offsets.flatten.toMap
}
// 将offsets保存到Redis中
def saveOffsetsToRedis(offsets: Array[OffsetRange], groupId: String): Unit = {
// 获取连接
val jedis: Jedis = getRedisConnection
// 组织数据
offsets.map{range => (range.topic, (range.partition.toString, range.untilOffset.toString))}
.groupBy(_._1)
.foreach{case (topic, buffer) =>
val key: String = getKey(topic, groupId)
import scala.collection.JavaConverters._
val maps: util.Map[String, String] = buffer.map(_._2).toMap.asJava
// 保存数据
jedis.hmset(key, maps)
}
jedis.close()
}
def main(args: Array[String]): Unit = {
val topics = Array("topicB", "topicC")
val groupid = "group01"
val x: Map[TopicPartition, Long] = getOffsetsFromRedis(topics, groupid)
x.foreach(println)
}
}
// hmset kafka:topic:topicB:group01 0 0 1 100 2 200
// hgetall kafka:topic:topicB:group01
// val groupId: String = "group01"
// val topics: Array[String] = Array("topicB")
// val offsets: Map[TopicPartition, Long] = getOffsetsFromRedis(topics, groupId)
// offsets.foreach(println)
// val groupid = "group01"
// val topic = "topicB"
// val offsets = Array(
// OffsetRange(topic, 0, 0, 600),
// OffsetRange(topic, 1, 100, 1000),
// OffsetRange(topic, 2, 200, 2000)
// )
// saveOffsetsToRedis(offsets, groupid)
// ./redis-server /opt/yanqi/software/redis-5.0.5/redis.conf
### --- 在redis下准备数据
[root@hadoop03 ~]# cd /opt/yanqi/servers/redis/bin/
[root@hadoop03 bin]# ./redis-cli -h 127.0.0.1 -p 6379
127.0.0.1:6379>
~~~ # 在redis下准备数据
127.0.0.1:6379> hmset kafka:topic:topicB:group01 0 0 1 100 2 200
OK
127.0.0.1:6379> hgetall kafka:topic:topicB:group01
1) "0"
2) "0"
3) "1"
4) "100"
5) "2"
6) "200"
### --- 编译打印
D:\JAVA\jdk1.8.0_231\bin\java.exe "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=50491:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath 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mons-pool2-2.4.2.jar cn.yanqi.kafka.OffsetsWithRedisUtils
四、编程实现:key从Redis 获取offsets根据该offsets从kafka读数据处理完数据后将offsets保存到 Redis
### --- 根据key从redis获取offsets
~~~ # 数据结构选择:Hash;key、field、value
~~~ # 从 Redis 中获取保存的offsets
~~~ # 消费数据后将offsets保存到redis
Key:kafka:topic:TopicName:groupid
Field:partition
Value:offset
### --- 编程实现:主程序(从kafka获取数据,使用 Redis 保存offsets)
package cn.yanqi.kafka
import org.apache.kafka.clients.consumer.{ConsumerConfig, ConsumerRecord}
import org.apache.kafka.common.TopicPartition
import org.apache.kafka.common.serialization.StringDeserializer
import org.apache.log4j.{Level, Logger}
import org.apache.spark.streaming.dstream.InputDStream
import org.apache.spark.streaming.kafka010._
import org.apache.spark.streaming.{Seconds, StreamingContext}
import org.apache.spark.{SparkConf, TaskContext}
object KafkaDStream3 {
def main(args: Array[String]): Unit = {
// 初始化
Logger.getLogger("org").setLevel(Level.ERROR)
val conf = new SparkConf().setAppName(this.getClass.getCanonicalName).setMaster("local[*]")
val ssc = new StreamingContext(conf, Seconds(5))
// 定义kafka相关参数
val groupId: String = "yanqi_group01"
val topics: Array[String] = Array("yanqi_topic01", "yanqi_topic02")
val kafkaParams: Map[String, Object] = getKafkaConsumerParameters(groupId)
// 从 Redis中获取offsets
val offsets: Map[TopicPartition, Long] = OffsetsWithRedisUtils.getOffsetsFromRedis(topics, groupId)
offsets.foreach(println)
// 创建DStream
val dstream: InputDStream[ConsumerRecord[String, String]] = KafkaUtils.createDirectStream(
ssc,
LocationStrategies.PreferConsistent,
ConsumerStrategies.Subscribe[String, String](topics, kafkaParams, offsets)
)
// DStream转换&输出
dstream.foreachRDD{ (rdd, time) =>
if (! rdd.isEmpty()) {
// 处理消息
println(s"*********** rdd.count = ${rdd.count()}; time = $time *************")
// 将offsets信息打印到控制台
val offsetRanges: Array[OffsetRange] = rdd.asInstanceOf[HasOffsetRanges].offsetRanges
rdd.foreachPartition{ iter =>
val range: OffsetRange = offsetRanges(TaskContext.get.partitionId)
println(s"${range.topic} ${range.partition} ${range.fromOffset} ${range.untilOffset} ")
}
// 将offsets保存到Redis
OffsetsWithRedisUtils.saveOffsetsToRedis(offsetRanges, groupId)
}
}
// 启动作业
ssc.start()
ssc.awaitTermination()
}
def getKafkaConsumerParameters(groupid: String): Map[String, Object] = {
Map[String, Object](
ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG -> "hadoop01:9092,hadoop02:9092,hadoop03:9092",
ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG -> classOf[StringDeserializer],
ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG -> classOf[StringDeserializer],
ConsumerConfig.GROUP_ID_CONFIG -> groupid,
ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG -> (false: java.lang.Boolean)
// ConsumerConfig.AUTO_OFFSET_RESET_CONFIG -> "earliest"
)
}
}
// kafka-topics.sh --zookeeper hadoop01:2181,hadoop02:2181,hadoop03:2181 --create --topic yanqi_topic01 --replication-factor 2 --partitions 3
// kafka-topics.sh --zookeeper hadoop01:2181,hadoop02:2181,hadoop03:2181 --create --topic yanqi_topic02 --replication-factor 2 --partitions 2
### --- 编译打印
D:\JAVA\jdk1.8.0_231\bin\java.exe "-javaagent:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\lib\idea_rt.jar=50491:D:\IntelliJIDEA\IntelliJ IDEA 2019.3.3\bin" -Dfile.encoding=UTF-8 -classpath 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cn.yanqi.kafka.OffsetsWithRedisUtils
Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart
——W.S.Landor
分类:
bdv017-spark.v02
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