Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/3200#discussion_r20329653
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/BlockMatrix.scala
---
@@ -0,0 +1,331 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.mllib.linalg.distributed
+
+import breeze.linalg.{DenseMatrix => BDM}
+
+import org.apache.spark._
+import org.apache.spark.mllib.linalg.DenseMatrix
+import org.apache.spark.rdd.RDD
+import org.apache.spark.storage.StorageLevel
+import org.apache.spark.util.Utils
+
+/**
+ * Represents a local matrix that makes up one block of a distributed
BlockMatrix
+ *
+ * @param blockIdRow The row index of this block
+ * @param blockIdCol The column index of this block
+ * @param mat The underlying local matrix
+ */
+case class BlockPartition(blockIdRow: Int, blockIdCol: Int, mat:
DenseMatrix) extends Serializable
+
+/**
+ * Information about the BlockMatrix maintained on the driver
+ *
+ * @param partitionId The id of the partition the block is found in
+ * @param blockIdRow The row index of this block
+ * @param blockIdCol The column index of this block
+ * @param startRow The starting row index with respect to the distributed
BlockMatrix
+ * @param numRows The number of rows in this block
+ * @param startCol The starting column index with respect to the
distributed BlockMatrix
+ * @param numCols The number of columns in this block
+ */
+case class BlockPartitionInfo(
+ partitionId: Int,
+ blockIdRow: Int,
+ blockIdCol: Int,
+ startRow: Long,
+ numRows: Int,
+ startCol: Long,
+ numCols: Int) extends Serializable
+
+/**
+ * A partitioner that decides how the matrix is distributed in the cluster
+ *
+ * @param numPartitions Number of partitions
+ * @param rowPerBlock Number of rows that make up each block.
+ * @param colPerBlock Number of columns that make up each block.
+ */
+abstract class BlockMatrixPartitioner(
+ override val numPartitions: Int,
+ val rowPerBlock: Int,
+ val colPerBlock: Int) extends Partitioner {
+ val name: String
+
+ override def getPartition(key: Any): Int = {
--- End diff --
Need doc on the input key.
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