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| 82 | <H2> |
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| 83 | Package org.apache.hadoop.fs.kfs |
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| 84 | </H2> |
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| 85 | A client for the Kosmos filesystem (KFS) |
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| 86 | <P> |
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| 87 | <B>See:</B> |
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| 88 | <BR> |
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| 89 | <A HREF="#package_description"><B>Description</B></A> |
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| 98 | <TD WIDTH="15%"><B><A HREF="../../../../../org/apache/hadoop/fs/kfs/KosmosFileSystem.html" title="class in org.apache.hadoop.fs.kfs">KosmosFileSystem</A></B></TD> |
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| 99 | <TD>A FileSystem backed by KFS.</TD> |
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| 102 | |
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| 105 | <A NAME="package_description"><!-- --></A><H2> |
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| 106 | Package org.apache.hadoop.fs.kfs Description |
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| 107 | </H2> |
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| 108 | |
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| 109 | <P> |
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| 110 | <h1>A client for the Kosmos filesystem (KFS)</h1> |
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| 111 | |
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| 112 | <h3>Introduction</h3> |
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| 113 | |
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| 114 | This pages describes how to use Kosmos Filesystem |
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| 115 | (<a href="http://kosmosfs.sourceforge.net"> KFS </a>) as a backing |
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| 116 | store with Hadoop. This page assumes that you have downloaded the |
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| 117 | KFS software and installed necessary binaries as outlined in the KFS |
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| 118 | documentation. |
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| 119 | |
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| 120 | <h3>Steps</h3> |
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| 121 | |
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| 122 | <ul> |
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| 123 | <li>In the Hadoop conf directory edit core-site.xml, |
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| 124 | add the following: |
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| 125 | <pre> |
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| 126 | <property> |
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| 127 | <name>fs.kfs.impl</name> |
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| 128 | <value>org.apache.hadoop.fs.kfs.KosmosFileSystem</value> |
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| 129 | <description>The FileSystem for kfs: uris.</description> |
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| 130 | </property> |
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| 131 | </pre> |
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| 132 | |
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| 133 | <li>In the Hadoop conf directory edit core-site.xml, |
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| 134 | adding the following (with appropriate values for |
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| 135 | <server> and <port>): |
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| 136 | <pre> |
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| 137 | <property> |
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| 138 | <name>fs.default.name</name> |
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| 139 | <value>kfs://<server:port></value> |
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| 140 | </property> |
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| 141 | |
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| 142 | <property> |
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| 143 | <name>fs.kfs.metaServerHost</name> |
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| 144 | <value><server></value> |
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| 145 | <description>The location of the KFS meta server.</description> |
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| 146 | </property> |
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| 147 | |
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| 148 | <property> |
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| 149 | <name>fs.kfs.metaServerPort</name> |
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| 150 | <value><port></value> |
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| 151 | <description>The location of the meta server's port.</description> |
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| 152 | </property> |
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| 153 | |
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| 154 | </pre> |
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| 155 | </li> |
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| 156 | |
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| 157 | <li>Copy KFS's <i> kfs-0.1.jar </i> to Hadoop's lib directory. This step |
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| 158 | enables Hadoop's to load the KFS specific modules. Note |
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| 159 | that, kfs-0.1.jar was built when you compiled KFS source |
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| 160 | code. This jar file contains code that calls KFS's client |
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| 161 | library code via JNI; the native code is in KFS's <i> |
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| 162 | libkfsClient.so </i> library. |
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| 163 | </li> |
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| 164 | |
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| 165 | <li> When the Hadoop map/reduce trackers start up, those |
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| 166 | processes (on local as well as remote nodes) will now need to load |
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| 167 | KFS's <i> libkfsClient.so </i> library. To simplify this process, it is advisable to |
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| 168 | store libkfsClient.so in an NFS accessible directory (similar to where |
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| 169 | Hadoop binaries/scripts are stored); then, modify Hadoop's |
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| 170 | conf/hadoop-env.sh adding the following line and providing suitable |
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| 171 | value for <path>: |
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| 172 | <pre> |
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| 173 | export LD_LIBRARY_PATH=<path> |
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| 174 | </pre> |
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| 175 | |
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| 176 | |
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| 177 | <li>Start only the map/reduce trackers |
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| 178 | <br /> |
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| 179 | example: execute Hadoop's bin/start-mapred.sh</li> |
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| 180 | </ul> |
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| 181 | <br/> |
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| 182 | |
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| 183 | If the map/reduce job trackers start up, all file-I/O is done to KFS. |
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| 184 | <P> |
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