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| <h2 title="Interface WALStreamReader" class="title">Interface WALStreamReader</h2> |
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| <dt>All Superinterfaces:</dt> |
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| <dd><a href="../../../../../org/apache/hadoop/hbase/regionserver/wal/ProtobufWALStreamReader.html" title="class in org.apache.hadoop.hbase.regionserver.wal">ProtobufWALStreamReader</a></dd> |
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| <pre>@InterfaceAudience.Private |
| public interface <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALStreamReader.html#line.33">WALStreamReader</a> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></pre> |
| <div class="block">A one way WAL reader, without reset and seek support. |
| <p/> |
| In most cases you should use this interface to read WAL file, as the implementation is simple and |
| robust. For replication, where we want to tail the WAL file which is currently being written, you |
| should use <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.html" title="interface in org.apache.hadoop.hbase.wal"><code>WALTailingReader</code></a> instead.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.html" title="interface in org.apache.hadoop.hbase.wal"><code>WALTailingReader</code></a></dd> |
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| <h3>Method Summary</h3> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALStreamReader.html#close--">close</a></span>()</code> |
| <div class="block">Override to remove the 'throws IOException' as we are just a reader.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALStreamReader.html#getPosition--">getPosition</a></span>()</code> |
| <div class="block">Get the current reading position.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>default <a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALStreamReader.html#next--">next</a></span>()</code> |
| <div class="block">Read the next entry in WAL.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALStreamReader.html#next-org.apache.hadoop.hbase.wal.WAL.Entry-">next</a></span>(<a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a> reuse)</code> |
| <div class="block">Read the next entry in WAL, use the given <a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal"><code>WAL.Entry</code></a> if not <code>null</code> to hold the |
| data.</div> |
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| <h4>next</h4> |
| <pre>default <a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALStreamReader.html#line.41">next</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">Read the next entry in WAL. |
| <p/> |
| In most cases you should just use this method, especially when reading a closed wal file for |
| splitting or printing.</div> |
| <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> |
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| <!-- --> |
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| <h4>next</h4> |
| <pre><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALStreamReader.html#line.52">next</a>(<a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a> reuse) |
| 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">Read the next entry in WAL, use the given <a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal"><code>WAL.Entry</code></a> if not <code>null</code> to hold the |
| data. |
| <p/> |
| Mainly used in MR.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>reuse</code> - the entry to be used for reading, can be <code>null</code></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></dd> |
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| <a name="getPosition--"> |
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| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getPosition</h4> |
| <pre>long <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALStreamReader.html#line.57">getPosition</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">Get the current reading position.</div> |
| <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="close--"> |
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| <h4>close</h4> |
| <pre>void <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALStreamReader.html#line.63">close</a>()</pre> |
| <div class="block">Override to remove the 'throws IOException' as we are just a reader.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true#close--" title="class or interface in java.lang">close</a></code> in interface <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/AutoCloseable.html?is-external=true" title="class or interface in java.lang">AutoCloseable</a></code></dd> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true#close--" title="class or interface in java.io">close</a></code> in interface <code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/Closeable.html?is-external=true" title="class or interface in java.io">Closeable</a></code></dd> |
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