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| <div class="subTitle">org.apache.hadoop.hbase.util</div> |
| <h2 title="Class RotateFile" class="title">Class RotateFile</h2> |
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| <ul class="inheritance"> |
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| <li>org.apache.hadoop.hbase.util.RotateFile</li> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RotateFile.html#line.42">RotateFile</a> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">A file storage which supports atomic update through two files, i.e, rotating. The implementation |
| does not require atomic rename.</div> |
| </li> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private org.apache.hadoop.fs.Path[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RotateFile.html#files">files</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private org.apache.hadoop.fs.FileSystem</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RotateFile.html#fs">fs</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static org.slf4j.Logger</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RotateFile.html#LOG">LOG</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RotateFile.html#maxFileSize">maxFileSize</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RotateFile.html#nextFile">nextFile</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RotateFile.html#prevTimestamp">prevTimestamp</a></span></code> </td> |
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| <h3>Constructor Summary</h3> |
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| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RotateFile.html#RotateFile-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.fs.Path-java.lang.String-long-">RotateFile</a></span>(org.apache.hadoop.fs.FileSystem fs, |
| org.apache.hadoop.fs.Path dir, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name, |
| long maxFileSize)</code> |
| <div class="block">Constructs a new RotateFile object with the given parameters.</div> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RotateFile.html#delete--">delete</a></span>()</code> |
| <div class="block">Deletes the two files used for rotating data.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>byte[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RotateFile.html#read--">read</a></span>()</code> |
| <div class="block">Reads the content of the rotate file by selecting the winner file based on the timestamp of the |
| data inside the files.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>private org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RotateFileData</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RotateFile.html#read-org.apache.hadoop.fs.Path-">read</a></span>(org.apache.hadoop.fs.Path path)</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>private int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RotateFile.html#select-org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RotateFileData:A-">select</a></span>(org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RotateFileData[] datas)</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RotateFile.html#write-byte:A-">write</a></span>(byte[] data)</code> |
| <div class="block">Writes the given data to the next file in the rotation, with a timestamp calculated based on |
| the previous timestamp and the current time to make sure it is greater than the previous |
| timestamp.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>(package private) static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RotateFile.html#write-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.fs.Path-long-byte:A-">write</a></span>(org.apache.hadoop.fs.FileSystem fs, |
| org.apache.hadoop.fs.Path file, |
| long timestamp, |
| byte[] data)</code> </td> |
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| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
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| <pre>private static final org.slf4j.Logger <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RotateFile.html#line.44">LOG</a></pre> |
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| <h4>fs</h4> |
| <pre>private final org.apache.hadoop.fs.FileSystem <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RotateFile.html#line.46">fs</a></pre> |
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| <h4>nextFile</h4> |
| <pre>private int <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RotateFile.html#line.55">nextFile</a></pre> |
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| <h3>Constructor Detail</h3> |
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| <h4>RotateFile</h4> |
| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RotateFile.html#line.64">RotateFile</a>(org.apache.hadoop.fs.FileSystem fs, |
| org.apache.hadoop.fs.Path dir, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name, |
| long maxFileSize)</pre> |
| <div class="block">Constructs a new RotateFile object with the given parameters.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>fs</code> - the file system to use.</dd> |
| <dd><code>dir</code> - the directory where the files will be created.</dd> |
| <dd><code>name</code> - the base name for the files.</dd> |
| <dd><code>maxFileSize</code> - the maximum size of each file.</dd> |
| </dl> |
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| <h4>read</h4> |
| <pre>private org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RotateFileData <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RotateFile.html#line.71">read</a>(org.apache.hadoop.fs.Path path) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| </dl> |
| </li> |
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| <a name="select-org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RotateFileData:A-"> |
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| <pre>private int <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RotateFile.html#line.94">select</a>(org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos.RotateFileData[] datas)</pre> |
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| <h4>read</h4> |
| <pre>public byte[] <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RotateFile.html#line.114">read</a>() |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Reads the content of the rotate file by selecting the winner file based on the timestamp of the |
| data inside the files. It reads the content of both files and selects the one with the latest |
| timestamp as the winner. If a file is incomplete or does not exist, it logs the error and moves |
| on to the next file. It returns the content of the winner file as a byte array. If none of the |
| files have valid data, it returns null.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a byte array containing the data from the winner file, or null if no valid data is |
| found.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if an error occurs while reading the files.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="write-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.fs.Path-long-byte:A-"> |
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| <h4>write</h4> |
| <pre>static void <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RotateFile.html#line.137">write</a>(org.apache.hadoop.fs.FileSystem fs, |
| org.apache.hadoop.fs.Path file, |
| long timestamp, |
| byte[] data) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| </dl> |
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| <h4>write</h4> |
| <pre>public void <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RotateFile.html#line.162">write</a>(byte[] data) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Writes the given data to the next file in the rotation, with a timestamp calculated based on |
| the previous timestamp and the current time to make sure it is greater than the previous |
| timestamp. The method also deletes the previous file, which is no longer needed. |
| <p/> |
| Notice that, for a newly created <a href="../../../../../org/apache/hadoop/hbase/util/RotateFile.html" title="class in org.apache.hadoop.hbase.util"><code>RotateFile</code></a> instance, you need to call <a href="../../../../../org/apache/hadoop/hbase/util/RotateFile.html#read--"><code>read()</code></a> |
| first to initialize the nextFile index, before calling this method.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>data</code> - the data to be written to the file</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if an I/O error occurs while writing the data to the file</dd> |
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| <h4>delete</h4> |
| <pre>public void <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RotateFile.html#line.185">delete</a>() |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Deletes the two files used for rotating data. If any of the files cannot be deleted, an |
| IOException is thrown.</div> |
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| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if there is an error deleting either file</dd> |
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