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| <h1 title="Package" class="title">Package org.apache.hadoop.hdfs</h1> |
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| <div class="block">A distributed implementation of <code>FileSystem</code>.</div> |
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| <td class="colFirst"><a href="../../../../org/apache/hadoop/hdfs/DFSUtil.ConfiguredNNAddress.html" title="class in org.apache.hadoop.hdfs">DFSUtil.ConfiguredNNAddress</a></td> |
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| <div class="block">Represent one of the NameNodes configured in the cluster.</div> |
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| <td class="colFirst"><a href="../../../../org/apache/hadoop/hdfs/DFSUtil.ServiceComparator.html" title="class in org.apache.hadoop.hdfs">DFSUtil.ServiceComparator</a></td> |
| <td class="colLast"> |
| <div class="block">Comparator for sorting DataNodeInfo[] based on |
| decommissioned and entering_maintenance states.</div> |
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| <td class="colFirst"><a href="../../../../org/apache/hadoop/hdfs/HdfsDtFetcher.html" title="class in org.apache.hadoop.hdfs">HdfsDtFetcher</a></td> |
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| <div class="block">DtFetcher is an interface which permits the abstraction and separation of |
| delegation token fetch implementaions across different packages and |
| compilation units.</div> |
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| <td class="colFirst"><a href="../../../../org/apache/hadoop/hdfs/SWebHdfsDtFetcher.html" title="class in org.apache.hadoop.hdfs">SWebHdfsDtFetcher</a></td> |
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| <div class="block">DtFetcher for SWebHdfsFileSystem using the base class HdfsDtFetcher impl.</div> |
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| <td class="colFirst"><a href="../../../../org/apache/hadoop/hdfs/WebHdfsDtFetcher.html" title="class in org.apache.hadoop.hdfs">WebHdfsDtFetcher</a></td> |
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| <div class="block">DtFetcher for WebHdfsFileSystem using the base class HdfsDtFetcher impl.</div> |
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| <h2 title="Package org.apache.hadoop.hdfs Description">Package org.apache.hadoop.hdfs Description</h2> |
| <div class="block"><p>A distributed implementation of <code>FileSystem</code>. This is loosely modelled after |
| Google's <a href="http://research.google.com/archive/gfs.html">GFS</a>.</p> |
| |
| <p>The most important difference is that unlike GFS, Hadoop DFS files |
| have strictly one writer at any one time. Bytes are always appended |
| to the end of the writer's stream. There is no notion of "record appends" |
| or "mutations" that are then checked or reordered. Writers simply emit |
| a byte stream. That byte stream is guaranteed to be stored in the |
| order written.</p></div> |
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