所以我想编写一个代码来从Hadoop HBase读取记录,然后将其存储到Spark RDD(弹性分布式数据集)中;然后读取一条RDD记录,然后写入HBase。我对这两者中的任何一个都有零知识,我需要使用AWS云或Hadoop虚拟机。有人请指导我从头开始。
答案 0 :(得分:2)
请使用Scala中的基本代码,我们使用Scala在HBase中读取数据。同样,您可以编写表创建来将数据写入HBase
import org.apache.hadoop.hbase.client.{HBaseAdmin, Result}
import org.apache.hadoop.hbase.{ HBaseConfiguration, HTableDescriptor }
import org.apache.hadoop.hbase.mapreduce.TableInputFormat
import org.apache.hadoop.hbase.io.ImmutableBytesWritable
import org.apache.spark._
object HBaseApp {
def main(args: Array[String]) {
val sparkConf = new SparkConf().setAppName("HBaseApp").setMaster("local[2]")
val sc = new SparkContext(sparkConf)
val conf = HBaseConfiguration.create()
val tableName = "table1"
System.setProperty("user.name", "hdfs")
System.setProperty("HADOOP_USER_NAME", "hdfs")
conf.set("hbase.master", "localhost:60000")
conf.setInt("timeout", 100000)
conf.set("hbase.zookeeper.quorum", "localhost")
conf.set("zookeeper.znode.parent", "/hbase-unsecure")
conf.set(TableInputFormat.INPUT_TABLE, tableName)
val admin = new HBaseAdmin(conf)
if (!admin.isTableAvailable(tableName)) {
val tableDesc = new HTableDescriptor(tableName)
admin.createTable(tableDesc)
}
val hBaseRDD = sc.newAPIHadoopRDD(conf, classOf[TableInputFormat], classOf[ImmutableBytesWritable], classOf[Result])
println("Number of Records found : " + hBaseRDD.count())
sc.stop()
}
}