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193<h1>Hadoop Archives</h1>
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196<li>
197<a href="#%E4%BB%80%E4%B9%88%E6%98%AFHadoop+archives%3F"> ä»€ä¹ˆæ˜¯Hadoop archives? </a>
198</li>
199<li>
200<a href="#%E5%A6%82%E4%BD%95%E5%88%9B%E5%BB%BAarchive%3F"> åŠ‚䜕创建archive? </a>
201</li>
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203<a href="#%E5%A6%82%E4%BD%95%E6%9F%A5%E7%9C%8Barchives%E4%B8%AD%E7%9A%84%E6%96%87%E4%BB%B6%3F"> åŠ‚䜕查看archives䞭的文件? </a>
204</li>
205</ul>
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207       
208<a name="N1000D"></a><a name="%E4%BB%80%E4%B9%88%E6%98%AFHadoop+archives%3F"></a>
209<h2 class="h3"> ä»€ä¹ˆæ˜¯Hadoop archives? </h2>
210<div class="section">
211<p>
212        Hadoop archives是特殊的档案栌匏。䞀䞪Hadoop archive对应䞀䞪文件系统目圕。
213        Hadoop archive的扩展名是*.har。Hadoop archive包含元数据圢匏是_index和_masterindx和数据part-*文件。_index文件包含了档案䞭的文件的文件名和䜍眮信息。
214        </p>
215</div>
216       
217<a name="N10017"></a><a name="%E5%A6%82%E4%BD%95%E5%88%9B%E5%BB%BAarchive%3F"></a>
218<h2 class="h3"> åŠ‚䜕创建archive? </h2>
219<div class="section">
220<p>
221       
222<span class="codefrag">甚法: hadoop archive -archiveName name &lt;src&gt;* &lt;dest&gt;</span>
223       
224</p>
225<p>
226        由-archiveName选项指定䜠芁创建的archive的名字。比劂foo.har。archive的名字的扩展名应该是*.har。蟓入是文件系统的路埄名路埄名的栌匏和平时的衚蟟方匏䞀样。创建的archive䌚保存到目标目圕䞋。泚意创建archives是䞀䞪Map/Reduce job。䜠应该圚map reduce集矀䞊运行这䞪呜什。䞋面是䞀䞪䟋子
227        </p>
228<p>
229       
230<span class="codefrag">hadoop archive -archiveName foo.har /user/hadoop/dir1 /user/hadoop/dir2 /user/zoo/</span>
231       
232</p>
233<p>
234        圚䞊面的䟋子䞭
235        /user/hadoop/dir1 和 /user/hadoop/dir2 䌚被園档到这䞪文件系统目圕䞋
236        -- /user/zoo/foo.har。圓创建archive时源文件䞍䌚被曎改或删陀。
237        </p>
238</div>
239       
240<a name="N1002F"></a><a name="%E5%A6%82%E4%BD%95%E6%9F%A5%E7%9C%8Barchives%E4%B8%AD%E7%9A%84%E6%96%87%E4%BB%B6%3F"></a>
241<h2 class="h3"> åŠ‚䜕查看archives䞭的文件? </h2>
242<div class="section">
243<p>
244        archive䜜䞺文件系统层暎露给倖界。所以所有的fs shell呜什郜胜圚archive䞊运行䜆是芁䜿甚䞍同的URI。
245        及倖archive是䞍可改变的。所以重呜名删陀和创建郜䌚返回错误。Hadoop Archives 的URI是
246        </p>
247<p>
248<span class="codefrag">har://scheme-hostname:port/archivepath/fileinarchive</span>
249</p>
250<p>
251        劂果没提䟛scheme-hostname它䌚䜿甚默讀的文件系统。这种情况䞋URI是这种圢匏
252        </p>
253<p>
254<span class="codefrag">
255        har:///archivepath/fileinarchive</span>
256</p>
257<p>
258        这是䞀䞪archive的䟋子。archive的蟓入是/dir。这䞪dir目圕包含文件fileafileb。
259        把/dir園档到/user/hadoop/foo.bar的呜什是
260        </p>
261<p>
262<span class="codefrag">hadoop archive -archiveName foo.har /dir /user/hadoop</span>
263       
264</p>
265<p>
266        获埗创建的archive䞭的文件列衚䜿甚呜什
267        </p>
268<p>
269<span class="codefrag">hadoop dfs -lsr har:///user/hadoop/foo.har</span>
270</p>
271<p>查看archive侭的filea文件的呜什-
272        </p>
273<p>
274<span class="codefrag">hadoop dfs -cat har:///user/hadoop/foo.har/dir/filea</span>
275</p>
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