* Run a function on a given set of partitions in an RDD and return the results as an array. * * @param rdd target RDD to run tasks on * @param func a function to run on each partition of the RDD * @param partitions set of partitions to run on; some jobs may not want to comp...
class HashPartitioner(partitions: Int) extends Partitioner { require(partitions >= 0, s"Number of partitions ($partitions) cannot be negative.") //分区的总数,可以利用构造函数从外部传入 def numPartitions: Int = partitions //依据key进行分区的划分,就是划分每个key属于哪个分区 def getPartition(key: ...
require(partitions >= 0, s"Number of partitions ($partitions) cannot be negative.") def numPartitions: Int = partitions // 通过key计算其HashCode,并根据分区数取模。如果结果小于0,直接加上分区数。 def getPartition(key: Any): Int = key match { case null => 0 case _ => Utils.nonNegative...
require(partitions >= 0, s"Number of partitions ($partitions) cannot be negative.") //包含的分区个数 def numPartitions: Int = partitions //获得Key对应的partitionId def getPartition(key: Any): Int = key match { case null => 0 case _ => Utils.nonNegativeMod(key.hashCode, numPartitions...
classHashPartitioner(partitions:Int)extendsPartitioner{ require(partitions >=0,s"Number of partitions ($partitions) cannot be negative.")defnumPartitions:Int= partitionsdefgetPartition(key:Any):Int= keymatch{casenull=>0case_ =>Utils.nonNegativeMod(key.hashCode, numPartitions) ...
require(partitions >=0,s"Number of partitions ($partitions) cannot be negative.")defnumPartitions:Int= partitions// 通过key计算其HashCode,并根据分区数取模。如果结果小于0,直接加上分区数。defgetPartition(key:Any):Int= keymatch{casenull=>0case_ =>Utils.nonNegativeMod(key.hashCode, numPartitions)...
* @param numSlices number of partitions to divide the collection into * @return RDD representing distributed collection */defmakeRDD[T:ClassTag](seq:Seq[T],numSlices:Int=defaultParallelism):RDD[T]=withScope{parallelize(seq,numSlices)} 我们可以看到makeRDD中需要两个参数,一个是序列Seq,表示的数据,另...
套件: Microsoft.Spark v1.0.0 設定單字句子的分割區數目。 C# 複製 public Microsoft.Spark.ML.Feature.Word2Vec SetNumPartitions (int value); 參數 value Int32 單字句子的分割區數目,預設值為 1。 傳回 Word2Vec Word2Vec 適用於 產品版本 Microsoft.Spark latest 在此文章 定義 適用於 中文...
partitioner.options.max.number.of.partitions 要创建的分区数量。 默认:64 SinglePartitionPartitioner配置 SinglePartitionPartitioner配置创建单个分区。 要使用此配置,请将partitioner配置选项设置为com.mongodb.spark.sql.connector.read.partitioner.SinglePartitionPartitioner。
()varhbaseNumberOfPartitionsForTopic=0//Set the number of partitions discovered for a topic in HBase to 0if(result!=null){//If the result from hbase scanner is not null, set number of partitions from hbase to the number of cellshbaseNumberOfPartitionsForTopic=result.listCells().size()...