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| <pre>protected static class <a href="../../../../../src-html/org/apache/hadoop/hbase/master/RegionPlacementMaintainer.html#line.506">RegionPlacementMaintainer.RandomizedMatrix</a> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">Some algorithms for solving the assignment problem may traverse workers or |
| jobs in linear order which may result in skewing the assignments of the |
| first jobs in the matrix toward the last workers in the matrix if the |
| costs are uniform. To avoid this kind of clumping, we can randomize the |
| rows and columns of the cost matrix in a reversible way, such that the |
| solution to the assignment problem can be interpreted in terms of the |
| original untransformed cost matrix. Rows and columns are transformed |
| independently such that the elements contained in any row of the input |
| matrix are the same as the elements in the corresponding output matrix, |
| and each row has its elements transformed in the same way. Similarly for |
| columns.</div> |
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| <td class="colFirst"><code>private int[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/RegionPlacementMaintainer.RandomizedMatrix.html#colInverse">colInverse</a></span></code> </td> |
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| <td class="colFirst"><code>private int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/RegionPlacementMaintainer.RandomizedMatrix.html#cols">cols</a></span></code> </td> |
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| <td class="colFirst"><code>private int[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/RegionPlacementMaintainer.RandomizedMatrix.html#colTransform">colTransform</a></span></code> </td> |
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| <td class="colFirst"><code>private int[]</code></td> |
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| <td class="colFirst"><code>private int</code></td> |
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| <td class="colFirst"><code>private int[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/RegionPlacementMaintainer.RandomizedMatrix.html#rowTransform">rowTransform</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/RegionPlacementMaintainer.RandomizedMatrix.html#RandomizedMatrix-int-int-">RandomizedMatrix</a></span>(int rows, |
| int cols)</code> |
| <div class="block">Create a randomization scheme for a matrix of a given size.</div> |
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| <td class="colFirst"><code>float[][]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/RegionPlacementMaintainer.RandomizedMatrix.html#invert-float:A:A-">invert</a></span>(float[][] matrix)</code> |
| <div class="block">Copy a given matrix into a new matrix, transforming each row index and |
| each column index according to the inverse of the randomization scheme |
| that was created at construction time.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>int[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/RegionPlacementMaintainer.RandomizedMatrix.html#invertIndices-int:A-">invertIndices</a></span>(int[] indices)</code> |
| <div class="block">Given an array where each element <code>indices[i]</code> represents the |
| randomized column index corresponding to randomized row index <code>i</code>, |
| create a new array with the corresponding inverted indices.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>float[][]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/master/RegionPlacementMaintainer.RandomizedMatrix.html#transform-float:A:A-">transform</a></span>(float[][] matrix)</code> |
| <div class="block">Copy a given matrix into a new matrix, transforming each row index and |
| each column index according to the randomization scheme that was created |
| at construction time.</div> |
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| <pre>private final int <a href="../../../../../src-html/org/apache/hadoop/hbase/master/RegionPlacementMaintainer.RandomizedMatrix.html#line.507">rows</a></pre> |
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| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/master/RegionPlacementMaintainer.RandomizedMatrix.html#line.519">RandomizedMatrix</a>(int rows, |
| int cols)</pre> |
| <div class="block">Create a randomization scheme for a matrix of a given size.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>rows</code> - the number of rows in the matrix</dd> |
| <dd><code>cols</code> - the number of columns in the matrix</dd> |
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| <pre>public float[][] <a href="../../../../../src-html/org/apache/hadoop/hbase/master/RegionPlacementMaintainer.RandomizedMatrix.html#line.565">transform</a>(float[][] matrix)</pre> |
| <div class="block">Copy a given matrix into a new matrix, transforming each row index and |
| each column index according to the randomization scheme that was created |
| at construction time.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>matrix</code> - the cost matrix to transform</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a new matrix with row and column indices transformed</dd> |
| </dl> |
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| <pre>public float[][] <a href="../../../../../src-html/org/apache/hadoop/hbase/master/RegionPlacementMaintainer.RandomizedMatrix.html#line.582">invert</a>(float[][] matrix)</pre> |
| <div class="block">Copy a given matrix into a new matrix, transforming each row index and |
| each column index according to the inverse of the randomization scheme |
| that was created at construction time.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>matrix</code> - the cost matrix to be inverted</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a new matrix with row and column indices inverted</dd> |
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| <pre>public int[] <a href="../../../../../src-html/org/apache/hadoop/hbase/master/RegionPlacementMaintainer.RandomizedMatrix.html#line.599">invertIndices</a>(int[] indices)</pre> |
| <div class="block">Given an array where each element <code>indices[i]</code> represents the |
| randomized column index corresponding to randomized row index <code>i</code>, |
| create a new array with the corresponding inverted indices.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>indices</code> - an array of transformed indices to be inverted</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an array of inverted indices</dd> |
| </dl> |
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