[05/51] [partial] hbase-site git commit: Published site at 82d554e3783372cc6b05489452c815b57c06f6cd.

[git-site-role]

http://git-wip-us.apache.org/repos/asf/hbase-site/blob/6b4bae59/devapidocs/src-html/org/apache/hadoop/hbase/io/FileLink.FileLinkInputStream.html
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diff --git 
a/devapidocs/src-html/org/apache/hadoop/hbase/io/FileLink.FileLinkInputStream.html
 
b/devapidocs/src-html/org/apache/hadoop/hbase/io/FileLink.FileLinkInputStream.html
index a12d44c..6ee4990 100644
--- 
a/devapidocs/src-html/org/apache/hadoop/hbase/io/FileLink.FileLinkInputStream.html
+++ 
b/devapidocs/src-html/org/apache/hadoop/hbase/io/FileLink.FileLinkInputStream.html
@@ -37,472 +37,484 @@
 <span class="sourceLineNo">029</span>import org.apache.commons.logging.Log;<a 
name="line.29"></a>
 <span class="sourceLineNo">030</span>import 
org.apache.commons.logging.LogFactory;<a name="line.30"></a>
 <span class="sourceLineNo">031</span>import 
org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.31"></a>
-<span class="sourceLineNo">032</span>import 
org.apache.hadoop.fs.FSDataInputStream;<a name="line.32"></a>
-<span class="sourceLineNo">033</span>import org.apache.hadoop.fs.FileSystem;<a 
name="line.33"></a>
-<span class="sourceLineNo">034</span>import org.apache.hadoop.fs.FileStatus;<a 
name="line.34"></a>
-<span class="sourceLineNo">035</span>import org.apache.hadoop.fs.Path;<a 
name="line.35"></a>
-<span class="sourceLineNo">036</span>import 
org.apache.hadoop.fs.PositionedReadable;<a name="line.36"></a>
-<span class="sourceLineNo">037</span>import org.apache.hadoop.fs.Seekable;<a 
name="line.37"></a>
-<span class="sourceLineNo">038</span>import 
org.apache.hadoop.hbase.util.FSUtils;<a name="line.38"></a>
-<span class="sourceLineNo">039</span><a name="line.39"></a>
-<span class="sourceLineNo">040</span>/**<a name="line.40"></a>
-<span class="sourceLineNo">041</span> * The FileLink is a sort of hardlink, 
that allows access to a file given a set of locations.<a name="line.41"></a>
-<span class="sourceLineNo">042</span> *<a name="line.42"></a>
-<span class="sourceLineNo">043</span> * &lt;p&gt;&lt;b&gt;The 
Problem:&lt;/b&gt;<a name="line.43"></a>
-<span class="sourceLineNo">044</span> * &lt;ul&gt;<a name="line.44"></a>
-<span class="sourceLineNo">045</span> *  &lt;li&gt;<a name="line.45"></a>
-<span class="sourceLineNo">046</span> *    HDFS doesn't have support for 
hardlinks, and this make impossible to referencing<a name="line.46"></a>
-<span class="sourceLineNo">047</span> *    the same data blocks using 
different names.<a name="line.47"></a>
-<span class="sourceLineNo">048</span> *  &lt;/li&gt;<a name="line.48"></a>
-<span class="sourceLineNo">049</span> *  &lt;li&gt;<a name="line.49"></a>
-<span class="sourceLineNo">050</span> *    HBase store files in one location 
(e.g. table/region/family/) and when the file is not<a name="line.50"></a>
-<span class="sourceLineNo">051</span> *    needed anymore (e.g. compaction, 
region deletion, ...) moves it to an archive directory.<a name="line.51"></a>
-<span class="sourceLineNo">052</span> *  &lt;/li&gt;<a name="line.52"></a>
-<span class="sourceLineNo">053</span> * &lt;/ul&gt;<a name="line.53"></a>
-<span class="sourceLineNo">054</span> * If we want to create a reference to a 
file, we need to remember that it can be in its<a name="line.54"></a>
-<span class="sourceLineNo">055</span> * original location or in the archive 
folder.<a name="line.55"></a>
-<span class="sourceLineNo">056</span> * The FileLink class tries to abstract 
this concept and given a set of locations<a name="line.56"></a>
-<span class="sourceLineNo">057</span> * it is able to switch between them 
making this operation transparent for the user.<a name="line.57"></a>
-<span class="sourceLineNo">058</span> * {@link HFileLink} is a more concrete 
implementation of the {@code FileLink}.<a name="line.58"></a>
-<span class="sourceLineNo">059</span> *<a name="line.59"></a>
-<span class="sourceLineNo">060</span> * 
&lt;p&gt;&lt;b&gt;Back-references:&lt;/b&gt;<a name="line.60"></a>
-<span class="sourceLineNo">061</span> * To help the {@link 
org.apache.hadoop.hbase.master.cleaner.CleanerChore} to keep track of<a 
name="line.61"></a>
-<span class="sourceLineNo">062</span> * the links to a particular file, during 
the {@code FileLink} creation, a new file is placed<a name="line.62"></a>
-<span class="sourceLineNo">063</span> * inside a back-reference directory. 
There's one back-reference directory for each file that<a name="line.63"></a>
-<span class="sourceLineNo">064</span> * has links, and in the directory 
there's one file per link.<a name="line.64"></a>
-<span class="sourceLineNo">065</span> *<a name="line.65"></a>
-<span class="sourceLineNo">066</span> * &lt;p&gt;HFileLink Example<a 
name="line.66"></a>
-<span class="sourceLineNo">067</span> * &lt;ul&gt;<a name="line.67"></a>
-<span class="sourceLineNo">068</span> *  &lt;li&gt;<a name="line.68"></a>
-<span class="sourceLineNo">069</span> *      /hbase/table/region-x/cf/file-k<a 
name="line.69"></a>
-<span class="sourceLineNo">070</span> *      (Original File)<a 
name="line.70"></a>
-<span class="sourceLineNo">071</span> *  &lt;/li&gt;<a name="line.71"></a>
-<span class="sourceLineNo">072</span> *  &lt;li&gt;<a name="line.72"></a>
-<span class="sourceLineNo">073</span> *      
/hbase/table-cloned/region-y/cf/file-k.region-x.table<a name="line.73"></a>
-<span class="sourceLineNo">074</span> *     (HFileLink to the original file)<a 
name="line.74"></a>
-<span class="sourceLineNo">075</span> *  &lt;/li&gt;<a name="line.75"></a>
-<span class="sourceLineNo">076</span> *  &lt;li&gt;<a name="line.76"></a>
-<span class="sourceLineNo">077</span> *      
/hbase/table-2nd-cloned/region-z/cf/file-k.region-x.table<a name="line.77"></a>
-<span class="sourceLineNo">078</span> *      (HFileLink to the original 
file)<a name="line.78"></a>
-<span class="sourceLineNo">079</span> *  &lt;/li&gt;<a name="line.79"></a>
-<span class="sourceLineNo">080</span> *  &lt;li&gt;<a name="line.80"></a>
-<span class="sourceLineNo">081</span> *      
/hbase/.archive/table/region-x/.links-file-k/region-y.table-cloned<a 
name="line.81"></a>
-<span class="sourceLineNo">082</span> *      (Back-reference to the link in 
table-cloned)<a name="line.82"></a>
-<span class="sourceLineNo">083</span> *  &lt;/li&gt;<a name="line.83"></a>
-<span class="sourceLineNo">084</span> *  &lt;li&gt;<a name="line.84"></a>
-<span class="sourceLineNo">085</span> *      
/hbase/.archive/table/region-x/.links-file-k/region-z.table-2nd-cloned<a 
name="line.85"></a>
-<span class="sourceLineNo">086</span> *      (Back-reference to the link in 
table-2nd-cloned)<a name="line.86"></a>
-<span class="sourceLineNo">087</span> *  &lt;/li&gt;<a name="line.87"></a>
-<span class="sourceLineNo">088</span> * &lt;/ul&gt;<a name="line.88"></a>
-<span class="sourceLineNo">089</span> */<a name="line.89"></a>
-<span class="sourceLineNo">090</span>@InterfaceAudience.Private<a 
name="line.90"></a>
-<span class="sourceLineNo">091</span>public class FileLink {<a 
name="line.91"></a>
-<span class="sourceLineNo">092</span>  private static final Log LOG = 
LogFactory.getLog(FileLink.class);<a name="line.92"></a>
-<span class="sourceLineNo">093</span><a name="line.93"></a>
-<span class="sourceLineNo">094</span>  /** Define the Back-reference directory 
name prefix: .links-&amp;lt;hfile&amp;gt;/ */<a name="line.94"></a>
-<span class="sourceLineNo">095</span>  public static final String 
BACK_REFERENCES_DIRECTORY_PREFIX = ".links-";<a name="line.95"></a>
-<span class="sourceLineNo">096</span><a name="line.96"></a>
-<span class="sourceLineNo">097</span>  /**<a name="line.97"></a>
-<span class="sourceLineNo">098</span>   * FileLink InputStream that handles 
the switch between the original path<a name="line.98"></a>
-<span class="sourceLineNo">099</span>   * and the alternative locations, when 
the file is moved.<a name="line.99"></a>
-<span class="sourceLineNo">100</span>   */<a name="line.100"></a>
-<span class="sourceLineNo">101</span>  private static class 
FileLinkInputStream extends InputStream<a name="line.101"></a>
-<span class="sourceLineNo">102</span>      implements Seekable, 
PositionedReadable {<a name="line.102"></a>
-<span class="sourceLineNo">103</span>    private FSDataInputStream in = 
null;<a name="line.103"></a>
-<span class="sourceLineNo">104</span>    private Path currentPath = null;<a 
name="line.104"></a>
-<span class="sourceLineNo">105</span>    private long pos = 0;<a 
name="line.105"></a>
-<span class="sourceLineNo">106</span><a name="line.106"></a>
-<span class="sourceLineNo">107</span>    private final FileLink fileLink;<a 
name="line.107"></a>
-<span class="sourceLineNo">108</span>    private final int bufferSize;<a 
name="line.108"></a>
-<span class="sourceLineNo">109</span>    private final FileSystem fs;<a 
name="line.109"></a>
-<span class="sourceLineNo">110</span><a name="line.110"></a>
-<span class="sourceLineNo">111</span>    public FileLinkInputStream(final 
FileSystem fs, final FileLink fileLink)<a name="line.111"></a>
-<span class="sourceLineNo">112</span>        throws IOException {<a 
name="line.112"></a>
-<span class="sourceLineNo">113</span>      this(fs, fileLink, 
FSUtils.getDefaultBufferSize(fs));<a name="line.113"></a>
-<span class="sourceLineNo">114</span>    }<a name="line.114"></a>
-<span class="sourceLineNo">115</span><a name="line.115"></a>
-<span class="sourceLineNo">116</span>    public FileLinkInputStream(final 
FileSystem fs, final FileLink fileLink, int bufferSize)<a name="line.116"></a>
-<span class="sourceLineNo">117</span>        throws IOException {<a 
name="line.117"></a>
-<span class="sourceLineNo">118</span>      this.bufferSize = bufferSize;<a 
name="line.118"></a>
-<span class="sourceLineNo">119</span>      this.fileLink = fileLink;<a 
name="line.119"></a>
-<span class="sourceLineNo">120</span>      this.fs = fs;<a name="line.120"></a>
-<span class="sourceLineNo">121</span><a name="line.121"></a>
-<span class="sourceLineNo">122</span>      this.in = tryOpen();<a 
name="line.122"></a>
-<span class="sourceLineNo">123</span>    }<a name="line.123"></a>
-<span class="sourceLineNo">124</span><a name="line.124"></a>
-<span class="sourceLineNo">125</span>    @Override<a name="line.125"></a>
-<span class="sourceLineNo">126</span>    public int read() throws IOException 
{<a name="line.126"></a>
-<span class="sourceLineNo">127</span>      int res;<a name="line.127"></a>
-<span class="sourceLineNo">128</span>      try {<a name="line.128"></a>
-<span class="sourceLineNo">129</span>        res = in.read();<a 
name="line.129"></a>
-<span class="sourceLineNo">130</span>      } catch (FileNotFoundException e) 
{<a name="line.130"></a>
-<span class="sourceLineNo">131</span>        res = tryOpen().read();<a 
name="line.131"></a>
-<span class="sourceLineNo">132</span>      } catch (NullPointerException e) { 
// HDFS 1.x - DFSInputStream.getBlockAt()<a name="line.132"></a>
+<span class="sourceLineNo">032</span>import 
org.apache.hadoop.fs.CanSetDropBehind;<a name="line.32"></a>
+<span class="sourceLineNo">033</span>import 
org.apache.hadoop.fs.CanSetReadahead;<a name="line.33"></a>
+<span class="sourceLineNo">034</span>import 
org.apache.hadoop.fs.FSDataInputStream;<a name="line.34"></a>
+<span class="sourceLineNo">035</span>import org.apache.hadoop.fs.FileSystem;<a 
name="line.35"></a>
+<span class="sourceLineNo">036</span>import org.apache.hadoop.fs.FileStatus;<a 
name="line.36"></a>
+<span class="sourceLineNo">037</span>import org.apache.hadoop.fs.Path;<a 
name="line.37"></a>
+<span class="sourceLineNo">038</span>import 
org.apache.hadoop.fs.PositionedReadable;<a name="line.38"></a>
+<span class="sourceLineNo">039</span>import org.apache.hadoop.fs.Seekable;<a 
name="line.39"></a>
+<span class="sourceLineNo">040</span>import 
org.apache.hadoop.hbase.util.FSUtils;<a name="line.40"></a>
+<span class="sourceLineNo">041</span><a name="line.41"></a>
+<span class="sourceLineNo">042</span>/**<a name="line.42"></a>
+<span class="sourceLineNo">043</span> * The FileLink is a sort of hardlink, 
that allows access to a file given a set of locations.<a name="line.43"></a>
+<span class="sourceLineNo">044</span> *<a name="line.44"></a>
+<span class="sourceLineNo">045</span> * &lt;p&gt;&lt;b&gt;The 
Problem:&lt;/b&gt;<a name="line.45"></a>
+<span class="sourceLineNo">046</span> * &lt;ul&gt;<a name="line.46"></a>
+<span class="sourceLineNo">047</span> *  &lt;li&gt;<a name="line.47"></a>
+<span class="sourceLineNo">048</span> *    HDFS doesn't have support for 
hardlinks, and this make impossible to referencing<a name="line.48"></a>
+<span class="sourceLineNo">049</span> *    the same data blocks using 
different names.<a name="line.49"></a>
+<span class="sourceLineNo">050</span> *  &lt;/li&gt;<a name="line.50"></a>
+<span class="sourceLineNo">051</span> *  &lt;li&gt;<a name="line.51"></a>
+<span class="sourceLineNo">052</span> *    HBase store files in one location 
(e.g. table/region/family/) and when the file is not<a name="line.52"></a>
+<span class="sourceLineNo">053</span> *    needed anymore (e.g. compaction, 
region deletion, ...) moves it to an archive directory.<a name="line.53"></a>
+<span class="sourceLineNo">054</span> *  &lt;/li&gt;<a name="line.54"></a>
+<span class="sourceLineNo">055</span> * &lt;/ul&gt;<a name="line.55"></a>
+<span class="sourceLineNo">056</span> * If we want to create a reference to a 
file, we need to remember that it can be in its<a name="line.56"></a>
+<span class="sourceLineNo">057</span> * original location or in the archive 
folder.<a name="line.57"></a>
+<span class="sourceLineNo">058</span> * The FileLink class tries to abstract 
this concept and given a set of locations<a name="line.58"></a>
+<span class="sourceLineNo">059</span> * it is able to switch between them 
making this operation transparent for the user.<a name="line.59"></a>
+<span class="sourceLineNo">060</span> * {@link HFileLink} is a more concrete 
implementation of the {@code FileLink}.<a name="line.60"></a>
+<span class="sourceLineNo">061</span> *<a name="line.61"></a>
+<span class="sourceLineNo">062</span> * 
&lt;p&gt;&lt;b&gt;Back-references:&lt;/b&gt;<a name="line.62"></a>
+<span class="sourceLineNo">063</span> * To help the {@link 
org.apache.hadoop.hbase.master.cleaner.CleanerChore} to keep track of<a 
name="line.63"></a>
+<span class="sourceLineNo">064</span> * the links to a particular file, during 
the {@code FileLink} creation, a new file is placed<a name="line.64"></a>
+<span class="sourceLineNo">065</span> * inside a back-reference directory. 
There's one back-reference directory for each file that<a name="line.65"></a>
+<span class="sourceLineNo">066</span> * has links, and in the directory 
there's one file per link.<a name="line.66"></a>
+<span class="sourceLineNo">067</span> *<a name="line.67"></a>
+<span class="sourceLineNo">068</span> * &lt;p&gt;HFileLink Example<a 
name="line.68"></a>
+<span class="sourceLineNo">069</span> * &lt;ul&gt;<a name="line.69"></a>
+<span class="sourceLineNo">070</span> *  &lt;li&gt;<a name="line.70"></a>
+<span class="sourceLineNo">071</span> *      /hbase/table/region-x/cf/file-k<a 
name="line.71"></a>
+<span class="sourceLineNo">072</span> *      (Original File)<a 
name="line.72"></a>
+<span class="sourceLineNo">073</span> *  &lt;/li&gt;<a name="line.73"></a>
+<span class="sourceLineNo">074</span> *  &lt;li&gt;<a name="line.74"></a>
+<span class="sourceLineNo">075</span> *      
/hbase/table-cloned/region-y/cf/file-k.region-x.table<a name="line.75"></a>
+<span class="sourceLineNo">076</span> *     (HFileLink to the original file)<a 
name="line.76"></a>
+<span class="sourceLineNo">077</span> *  &lt;/li&gt;<a name="line.77"></a>
+<span class="sourceLineNo">078</span> *  &lt;li&gt;<a name="line.78"></a>
+<span class="sourceLineNo">079</span> *      
/hbase/table-2nd-cloned/region-z/cf/file-k.region-x.table<a name="line.79"></a>
+<span class="sourceLineNo">080</span> *      (HFileLink to the original 
file)<a name="line.80"></a>
+<span class="sourceLineNo">081</span> *  &lt;/li&gt;<a name="line.81"></a>
+<span class="sourceLineNo">082</span> *  &lt;li&gt;<a name="line.82"></a>
+<span class="sourceLineNo">083</span> *      
/hbase/.archive/table/region-x/.links-file-k/region-y.table-cloned<a 
name="line.83"></a>
+<span class="sourceLineNo">084</span> *      (Back-reference to the link in 
table-cloned)<a name="line.84"></a>
+<span class="sourceLineNo">085</span> *  &lt;/li&gt;<a name="line.85"></a>
+<span class="sourceLineNo">086</span> *  &lt;li&gt;<a name="line.86"></a>
+<span class="sourceLineNo">087</span> *      
/hbase/.archive/table/region-x/.links-file-k/region-z.table-2nd-cloned<a 
name="line.87"></a>
+<span class="sourceLineNo">088</span> *      (Back-reference to the link in 
table-2nd-cloned)<a name="line.88"></a>
+<span class="sourceLineNo">089</span> *  &lt;/li&gt;<a name="line.89"></a>
+<span class="sourceLineNo">090</span> * &lt;/ul&gt;<a name="line.90"></a>
+<span class="sourceLineNo">091</span> */<a name="line.91"></a>
+<span class="sourceLineNo">092</span>@InterfaceAudience.Private<a 
name="line.92"></a>
+<span class="sourceLineNo">093</span>public class FileLink {<a 
name="line.93"></a>
+<span class="sourceLineNo">094</span>  private static final Log LOG = 
LogFactory.getLog(FileLink.class);<a name="line.94"></a>
+<span class="sourceLineNo">095</span><a name="line.95"></a>
+<span class="sourceLineNo">096</span>  /** Define the Back-reference directory 
name prefix: .links-&amp;lt;hfile&amp;gt;/ */<a name="line.96"></a>
+<span class="sourceLineNo">097</span>  public static final String 
BACK_REFERENCES_DIRECTORY_PREFIX = ".links-";<a name="line.97"></a>
+<span class="sourceLineNo">098</span><a name="line.98"></a>
+<span class="sourceLineNo">099</span>  /**<a name="line.99"></a>
+<span class="sourceLineNo">100</span>   * FileLink InputStream that handles 
the switch between the original path<a name="line.100"></a>
+<span class="sourceLineNo">101</span>   * and the alternative locations, when 
the file is moved.<a name="line.101"></a>
+<span class="sourceLineNo">102</span>   */<a name="line.102"></a>
+<span class="sourceLineNo">103</span>  private static class 
FileLinkInputStream extends InputStream<a name="line.103"></a>
+<span class="sourceLineNo">104</span>      implements Seekable, 
PositionedReadable, CanSetDropBehind, CanSetReadahead {<a name="line.104"></a>
+<span class="sourceLineNo">105</span>    private FSDataInputStream in = 
null;<a name="line.105"></a>
+<span class="sourceLineNo">106</span>    private Path currentPath = null;<a 
name="line.106"></a>
+<span class="sourceLineNo">107</span>    private long pos = 0;<a 
name="line.107"></a>
+<span class="sourceLineNo">108</span><a name="line.108"></a>
+<span class="sourceLineNo">109</span>    private final FileLink fileLink;<a 
name="line.109"></a>
+<span class="sourceLineNo">110</span>    private final int bufferSize;<a 
name="line.110"></a>
+<span class="sourceLineNo">111</span>    private final FileSystem fs;<a 
name="line.111"></a>
+<span class="sourceLineNo">112</span><a name="line.112"></a>
+<span class="sourceLineNo">113</span>    public FileLinkInputStream(final 
FileSystem fs, final FileLink fileLink)<a name="line.113"></a>
+<span class="sourceLineNo">114</span>        throws IOException {<a 
name="line.114"></a>
+<span class="sourceLineNo">115</span>      this(fs, fileLink, 
FSUtils.getDefaultBufferSize(fs));<a name="line.115"></a>
+<span class="sourceLineNo">116</span>    }<a name="line.116"></a>
+<span class="sourceLineNo">117</span><a name="line.117"></a>
+<span class="sourceLineNo">118</span>    public FileLinkInputStream(final 
FileSystem fs, final FileLink fileLink, int bufferSize)<a name="line.118"></a>
+<span class="sourceLineNo">119</span>        throws IOException {<a 
name="line.119"></a>
+<span class="sourceLineNo">120</span>      this.bufferSize = bufferSize;<a 
name="line.120"></a>
+<span class="sourceLineNo">121</span>      this.fileLink = fileLink;<a 
name="line.121"></a>
+<span class="sourceLineNo">122</span>      this.fs = fs;<a name="line.122"></a>
+<span class="sourceLineNo">123</span><a name="line.123"></a>
+<span class="sourceLineNo">124</span>      this.in = tryOpen();<a 
name="line.124"></a>
+<span class="sourceLineNo">125</span>    }<a name="line.125"></a>
+<span class="sourceLineNo">126</span><a name="line.126"></a>
+<span class="sourceLineNo">127</span>    @Override<a name="line.127"></a>
+<span class="sourceLineNo">128</span>    public int read() throws IOException 
{<a name="line.128"></a>
+<span class="sourceLineNo">129</span>      int res;<a name="line.129"></a>
+<span class="sourceLineNo">130</span>      try {<a name="line.130"></a>
+<span class="sourceLineNo">131</span>        res = in.read();<a 
name="line.131"></a>
+<span class="sourceLineNo">132</span>      } catch (FileNotFoundException e) 
{<a name="line.132"></a>
 <span class="sourceLineNo">133</span>        res = tryOpen().read();<a 
name="line.133"></a>
-<span class="sourceLineNo">134</span>      } catch (AssertionError e) { // 
assert in HDFS 1.x - DFSInputStream.getBlockAt()<a name="line.134"></a>
+<span class="sourceLineNo">134</span>      } catch (NullPointerException e) { 
// HDFS 1.x - DFSInputStream.getBlockAt()<a name="line.134"></a>
 <span class="sourceLineNo">135</span>        res = tryOpen().read();<a 
name="line.135"></a>
-<span class="sourceLineNo">136</span>      }<a name="line.136"></a>
-<span class="sourceLineNo">137</span>      if (res &gt; 0) pos += 1;<a 
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-<span class="sourceLineNo">138</span>      return res;<a name="line.138"></a>
-<span class="sourceLineNo">139</span>    }<a name="line.139"></a>
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