这篇文章主要讲解了“如何将数据按指定格式存入zookeeper”,文中的讲解内容简单清晰,易于学习与理解,下面请大家跟着小编的思路慢慢深入,一起来研究和学习“如何将数据按指定格式存入zookeeper”吧!
环境:
scala版本:2.11.8
zookeeper版本:3.4.5-cdh6.7.0
package com.ruozedata.zk import java.util.concurrent.TimeUnit import org.apache.curator.framework.CuratorFrameworkFactory import org.apache.curator.framework.recipes.locks.InterProcessMutex import org.apache.curator.retry.ExponentialBackoffRetry import org.slf4j.LoggerFactory import scala.collection.JavaConversions._ import scala.collection.mutable /** * Created by ganwei on 2018/08/21 * 要求: * 1 通过storeOffsets方法把数据存入zookeeper中。 * 存储格式: * /consumers/G322/offsets/ruoze_offset_topic/partition/0 * /consumers/G322/offsets/ruoze_offset_topic/partition/1 * /consumers/G322/offsets/ruoze_offset_topic/partition/2 * 2 通过obtainOffsets方法把存入的数据读取出来 * 输出格式: * topic:ruoze_offset_topic partition:0 offset:7 * topic:ruoze_offset_topic partition:1 offset:3 * topic:ruoze_offset_topic partition:2 offset:5 */ object ZkConnectApp{ val LOG = LoggerFactory.getLogger(ZkConnectApp.getClass) val client = { val client = CuratorFrameworkFactory .builder .connectString("172.16.100.31:2181") .retryPolicy(new ExponentialBackoffRetry(1000, 3)) .namespace("consumers") .build() client.start() client } def lock(path: String)(body: => Unit) { val lock = new InterProcessMutex(client, path) lock.acquire() try { body } finally { lock.release() } } def tryDo(path: String)(body: => Unit): Boolean = { val lock = new InterProcessMutex(client, path) if (!lock.acquire(10, TimeUnit.SECONDS)) { LOG.info(s"不能获得锁 {$path},已经有任务在运行,本次任务退出") return false } try { LOG.info("获准运行") body true } finally { lock.release() LOG.info(s"释放锁 {$path}") } } //zookeeper创建路径 def ensurePathExists(path: String): Unit = { if (client.checkExists().forPath(path) == null) { client.create().creatingParentsIfNeeded().forPath(path) } } /** * OffsetRange类定义(偏移量对象) * 用于存储偏移量 */ case class OffsetRange( val topic:String, // 主题 val partition:Int, // 分区 val fromOffset:Long, // 起始偏移量 val utilOffset:Long // 终止偏移量 ) /** * zookeeper存储offset的方法 * 写入格式: * /consumers/G322/offsets/ruoze_offset_topic/partition/0 * /consumers/G322/offsets/ruoze_offset_topic/partition/1 * /consumers/G322/offsets/ruoze_offset_topic/partition/2 * @param OffsetsRanges * @param groupName */ def storeOffsets(OffsetsRanges:Array[OffsetRange],groupName:String)={ val offsetRootPath = s"/"+groupName if (client.checkExists().forPath(offsetRootPath) == null) { client.create().creatingParentsIfNeeded().forPath(offsetRootPath) } for(els <- OffsetsRanges ){ val data = String.valueOf(els.utilOffset).getBytes val path = s"$offsetRootPath/offsets/${els.topic}/partition/${els.partition}" // 创建路径 ensurePathExists(path) // 写入数据 client.setData().forPath(path, data) } } /** * TopicAndPartition类定义(偏移量key对象) * 用于提取偏移量 */ case class TopicAndPartition( topic:String, // 主题 partition:Int // 分区 ) /** * zookeeper提取offset的方法 * @param topic * @param groupName * @return */ def obtainOffsets(topic:String,groupName:String):Map[TopicAndPartition,Long]={ // 定义一个空的HashMap val maps = mutable.HashMap[TopicAndPartition,Long]() // offset的路径 val offsetRootPath = s"/"+groupName+"/offsets/"+topic+"/partition" // 判断路径是否存在 val stat = client.checkExists().forPath(s"$offsetRootPath") if (stat == null ){ println(stat) // 路径不存在 就将路径打印在控制台,检查路径 }else{ // 获取 offsetRootPath路径下一级的所有子目录 // 我们这里是获取的所有分区 val children = client.getChildren.forPath(s"$offsetRootPath") // 遍历所有的分区 for ( lines <- children ){ // 获取分区的数据 val data = new String(client.getData().forPath(s"$offsetRootPath/"+lines)).toLong // 将 topic partition 和数据赋值给 maps maps(TopicAndPartition(topic,lines.toInt)) = data } } // 按partition排序后 返回map对象 maps.toList.sortBy(_._1.partition).toMap } def main(args: Array[String]) { //定义初始化数据 val off1 = OffsetRange("ruoze_offset_topic",0,0,7) val off2 = OffsetRange("ruoze_offset_topic",1,0,3) val off3 = OffsetRange("ruoze_offset_topic",2,0,5) val arr = Array(off1,off2,off3) //获取到namespace // println(client.getNamespace) // 创建路径 // val offsetRootPath = "/G322" // if (client.checkExists().forPath(offsetRootPath) == null) { // client.create().creatingParentsIfNeeded().forPath(offsetRootPath) // } //存储值 storeOffsets(arr,"G322") //获取值 /** * 输出格式: * topic:ruoze_offset_topic partition:0 offset:7 * topic:ruoze_offset_topic partition:1 offset:3 * topic:ruoze_offset_topic partition:2 offset:5 */ val result = obtainOffsets("ruoze_offset_topic","G322") for (map <- result){ println("topic:"+map._1.topic+"\t" +"partition:"+map._1.partition+"\t"+"offset:"+map._2) } } }
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