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| <h2 title="Interface IgfsRecordResolver" class="title">Interface IgfsRecordResolver</h2> |
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| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../../org/apache/ignite/igfs/mapreduce/records/IgfsByteDelimiterRecordResolver.html" title="class in org.apache.ignite.igfs.mapreduce.records">IgfsByteDelimiterRecordResolver</a>, <a href="../../../../../org/apache/ignite/igfs/mapreduce/records/IgfsFixedLengthRecordResolver.html" title="class in org.apache.ignite.igfs.mapreduce.records">IgfsFixedLengthRecordResolver</a>, <a href="../../../../../org/apache/ignite/igfs/mapreduce/records/IgfsNewLineRecordResolver.html" title="class in org.apache.ignite.igfs.mapreduce.records">IgfsNewLineRecordResolver</a>, <a href="../../../../../org/apache/ignite/igfs/mapreduce/records/IgfsStringDelimiterRecordResolver.html" title="class in org.apache.ignite.igfs.mapreduce.records">IgfsStringDelimiterRecordResolver</a></dd> |
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| <pre>public interface <span class="typeNameLabel">IgfsRecordResolver</span> |
| extends <a href="http://docs.oracle.com/javase/8/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a></pre> |
| <div class="block">IGFS record resolver. When <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsTask.html" title="class in org.apache.ignite.igfs.mapreduce"><code>IgfsTask</code></a> is split into <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsJob.html" title="interface in org.apache.ignite.igfs.mapreduce"><code>IgfsJob</code></a>s each produced job will obtain |
| <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsFileRange.html" title="class in org.apache.ignite.igfs.mapreduce"><code>IgfsFileRange</code></a> based on file data location. Record resolver is invoked in each job before actual |
| execution in order to adjust record boundaries in a way consistent with user data. |
| <p> |
| E.g., you may want to split your task into jobs so that each job process zero, one or several lines from that file. |
| But file is split into ranges based on block locations, not new line boundaries. Using convenient record resolver |
| you can adjust job range so that it covers the whole line(s). |
| <p> |
| The following record resolvers are available out of the box: |
| <ul> |
| <li><a href="../../../../../org/apache/ignite/igfs/mapreduce/records/IgfsFixedLengthRecordResolver.html" title="class in org.apache.ignite.igfs.mapreduce.records"><code>IgfsFixedLengthRecordResolver</code></a></li> |
| <li><a href="../../../../../org/apache/ignite/igfs/mapreduce/records/IgfsByteDelimiterRecordResolver.html" title="class in org.apache.ignite.igfs.mapreduce.records"><code>IgfsByteDelimiterRecordResolver</code></a></li> |
| <li><a href="../../../../../org/apache/ignite/igfs/mapreduce/records/IgfsStringDelimiterRecordResolver.html" title="class in org.apache.ignite.igfs.mapreduce.records"><code>IgfsStringDelimiterRecordResolver</code></a></li> |
| <li><a href="../../../../../org/apache/ignite/igfs/mapreduce/records/IgfsNewLineRecordResolver.html" title="class in org.apache.ignite.igfs.mapreduce.records"><code>IgfsNewLineRecordResolver</code></a></li> |
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| <td class="colFirst"><code>@Nullable <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsFileRange.html" title="class in org.apache.ignite.igfs.mapreduce">IgfsFileRange</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsRecordResolver.html#resolveRecords-org.apache.ignite.IgniteFileSystem-org.apache.ignite.igfs.IgfsInputStream-org.apache.ignite.igfs.mapreduce.IgfsFileRange-">resolveRecords</a></span>(<a href="../../../../../org/apache/ignite/IgniteFileSystem.html" title="interface in org.apache.ignite">IgniteFileSystem</a> fs, |
| <a href="../../../../../org/apache/ignite/igfs/IgfsInputStream.html" title="class in org.apache.ignite.igfs">IgfsInputStream</a> stream, |
| <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsFileRange.html" title="class in org.apache.ignite.igfs.mapreduce">IgfsFileRange</a> suggestedRecord)</code> |
| <div class="block">Adjusts record start offset and length.</div> |
| </td> |
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| <h4>resolveRecords</h4> |
| <pre>@Nullable |
| @Nullable <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsFileRange.html" title="class in org.apache.ignite.igfs.mapreduce">IgfsFileRange</a> resolveRecords(<a href="../../../../../org/apache/ignite/IgniteFileSystem.html" title="interface in org.apache.ignite">IgniteFileSystem</a> fs, |
| <a href="../../../../../org/apache/ignite/igfs/IgfsInputStream.html" title="class in org.apache.ignite.igfs">IgfsInputStream</a> stream, |
| <a href="../../../../../org/apache/ignite/igfs/mapreduce/IgfsFileRange.html" title="class in org.apache.ignite.igfs.mapreduce">IgfsFileRange</a> suggestedRecord) |
| throws <a href="../../../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a>, |
| <a href="http://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Adjusts record start offset and length.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>fs</code> - IGFS instance to use.</dd> |
| <dd><code>stream</code> - Input stream for split file.</dd> |
| <dd><code>suggestedRecord</code> - Suggested file system record.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>New adjusted record. If this method returns <code>null</code>, original record is ignored.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="../../../../../org/apache/ignite/IgniteException.html" title="class in org.apache.ignite">IgniteException</a></code> - If resolve failed.</dd> |
| <dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - If resolve failed.</dd> |
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| <p class="legalCopy"><small><table width="100%" border="0" cellspacing=0 cellpadding=0 style="padding: 5px"> <tr> <td> <table style="padding-left: 0; margin: 0"> <tbody style="padding: 0; margin: 0"> <tr style="padding: 0; margin: 0"> <td> <a target=_blank href="https://ignite.apache.org"><nobr>2020 Copyright © Apache Software Foundation</nobr></a> </td> </tr> </tbody> </table> </td> <td width="100%" align="right" valign="center"> <a href="https://twitter.com/ApacheIgnite" class="twitter-follow-button" data-show-count="false" data-size="large">Follow @ApacheIgnite</a> </td> </tr> <tr> <td colspan="2" valign="top" align="left"> <table style="padding-left: 0; margin: 0"> <tbody style="padding: 0; margin: 0"> <tr style="padding: 0; margin: 0"> <td> <b>Ignite Database and Caching Platform</b> </td> <td>: ver. <strong>2.8.0</strong> </td> </tr> <tr style="padding: 0; margin: 0"> <td> <b>Release Date</b> </td> <td>: February 27 2020 </td> </tr> </tbody> </table> </td> </tr> </table></small></p> |
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