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<!-- Licensed 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. See accompanying LICENSE file. --><div class="section">
<h2>HFTP Guide<a name="HFTP_Guide"></a></h2>
<ul>
<li><a href="#HFTP_Guide">HFTP Guide</a>
<ul>
<li><a href="#Introduction">Introduction</a></li>
<li><a href="#Implementation">Implementation</a></li>
<li><a href="#Configuration_Options">Configuration Options</a></li></ul></li></ul>
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<h3>Introduction<a name="Introduction"></a></h3>
<p>HFTP is a Hadoop filesystem implementation that lets you read data from a remote Hadoop HDFS cluster. The reads are done via HTTP, and data is sourced from DataNodes. HFTP is a read-only filesystem, and will throw exceptions if you try to use it to write data or modify the filesystem state.</p>
<p>HFTP is primarily useful if you have multiple HDFS clusters with different versions and you need to move data from one to another. HFTP is wire-compatible even between different versions of HDFS. For example, you can do things like: <tt>hadoop distcp -i hftp://sourceFS:50070/src hdfs://destFS:50070/dest</tt>. Note that HFTP is read-only so the destination must be an HDFS filesystem. (Also, in this example, the distcp should be run using the configuraton of the new filesystem.)</p>
<p>An extension, HSFTP, uses HTTPS by default. This means that data will be encrypted in transit.</p></div>
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<h3>Implementation<a name="Implementation"></a></h3>
<p>The code for HFTP lives in the Java class <tt>org.apache.hadoop.hdfs.HftpFileSystem</tt>. Likewise, HSFTP is implemented in <tt>org.apache.hadoop.hdfs.HsftpFileSystem</tt>.</p></div>
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<h3>Configuration Options<a name="Configuration_Options"></a></h3>
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<tr class="a">
<td align="right"><b>Name</b></td>
<td align="left"><b>Description</b></td></tr>
<tr class="b">
<td align="right"><tt>dfs.hftp.https.port</tt></td>
<td align="left">the HTTPS port on the remote cluster. If not set, HFTP will fall back on <tt>dfs.https.port</tt>.</td></tr>
<tr class="a">
<td align="right"><tt>hdfs.service.host_ip:port</tt></td>
<td align="left">Specifies the service name (for the security subsystem) associated with the HFTP filesystem running at ip:port.</td></tr></table></div></div>
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