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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.sysds.runtime.io</a></div> |
| <h2 title="Class ReaderTextCellParallel" class="title">Class ReaderTextCellParallel</h2> |
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| <li><a href="MatrixReader.html" title="class in org.apache.sysds.runtime.io">org.apache.sysds.runtime.io.MatrixReader</a></li> |
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| <li><a href="ReaderTextCell.html" title="class in org.apache.sysds.runtime.io">org.apache.sysds.runtime.io.ReaderTextCell</a></li> |
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| <li>org.apache.sysds.runtime.io.ReaderTextCellParallel</li> |
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| <pre>public class <span class="typeNameLabel">ReaderTextCellParallel</span> |
| extends <a href="ReaderTextCell.html" title="class in org.apache.sysds.runtime.io">ReaderTextCell</a></pre> |
| <div class="block">Parallel version of ReaderTextCell.java. To summarize, we create read tasks per split |
| and use a fixed-size thread pool, to executed these tasks. If the target matrix is dense, |
| the inserts are done lock-free. If the matrix is sparse, we use a buffer to collect |
| unordered input cells, lock the the target sparse matrix once, and append all buffered values. |
| |
| Note MatrixMarket: |
| 1) For matrix market files each read task probes for comments until it finds data because |
| for very small tasks or large comments, any split might encounter % or %%. Hence, |
| the parallel reader does not do the validity check for. |
| 2) In extreme scenarios, the last comment might be in one split, and the following meta data |
| in the subsequent split. This would create incorrect results or errors. However, this |
| scenario is extremely unlikely (num threads > num lines if 1 comment line) and hence ignored |
| similar to our parallel MR setting (but there we have a 128MB guarantee). |
| 3) However, we use MIN_FILESIZE_MM (8KB) to give guarantees for the common case of small headers |
| in order the issue described in (2).</div> |
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| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ReaderTextCellParallel.CellBuffer.html" title="class in org.apache.sysds.runtime.io">ReaderTextCellParallel.CellBuffer</a></span></code></th> |
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| <div class="block">Useful class for buffering unordered cells before locking target onces and |
| appending all buffered cells.</div> |
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| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ReaderTextCellParallel.CountNnzTask.html" title="class in org.apache.sysds.runtime.io">ReaderTextCellParallel.CountNnzTask</a></span></code></th> |
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| <td class="colFirst"><code>static class </code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="ReaderTextCellParallel.ReadTask.html" title="class in org.apache.sysds.runtime.io">ReaderTextCellParallel.ReadTask</a></span></code></th> |
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| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(org.apache.sysds.common.Types.FileFormat)">ReaderTextCellParallel</a></span>​(<a href="../../common/Types.FileFormat.html" title="enum in org.apache.sysds.common">Types.FileFormat</a> fmt)</code></th> |
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| <code><a href="ReaderTextCell.html#readMatrixFromHDFS(java.lang.String,long,long,int,long)">readMatrixFromHDFS</a>, <a href="ReaderTextCell.html#readMatrixFromInputStream(java.io.InputStream,long,long,int,long)">readMatrixFromInputStream</a></code></li> |
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| <h4>ReaderTextCellParallel</h4> |
| <pre>public ReaderTextCellParallel​(<a href="../../common/Types.FileFormat.html" title="enum in org.apache.sysds.common">Types.FileFormat</a> fmt)</pre> |
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