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| <h2 title="Enum WALTailingReader.State" class="title">Enum WALTailingReader.State</h2> |
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| <dd><a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.html" title="interface in org.apache.hadoop.hbase.wal">WALTailingReader</a></dd> |
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| <pre>public static enum <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALTailingReader.html#line.32">WALTailingReader.State</a> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</a><<a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html" title="enum in org.apache.hadoop.hbase.wal">WALTailingReader.State</a>></pre> |
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| <!-- =========== ENUM CONSTANT SUMMARY =========== --> |
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| <h3>Enum Constant Summary</h3> |
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| <caption><span>Enum Constants</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Enum Constant and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#EOF_AND_RESET">EOF_AND_RESET</a></span></code> |
| <div class="block">This means we reach the EOF and the upper layer need to reset to see if there is more data.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#EOF_AND_RESET_COMPRESSION">EOF_AND_RESET_COMPRESSION</a></span></code> |
| <div class="block">Mostly the same with the above <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#EOF_AND_RESET"><code>EOF_AND_RESET</code></a>, the difference is that here we also |
| mess up the compression dictionary when reading data, so the upper layer should also clear |
| the compression context when reseting, which means when calling resetTo method, we need to |
| skip to the position instead of just seek to, which will impact performance.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#EOF_WITH_TRAILER">EOF_WITH_TRAILER</a></span></code> |
| <div class="block">This means the WAL file has a trailer and we have reached it, which means we have finished |
| reading this file normally</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#ERROR_AND_RESET">ERROR_AND_RESET</a></span></code> |
| <div class="block">This means we meet an error so the upper layer need to reset to read again</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#ERROR_AND_RESET_COMPRESSION">ERROR_AND_RESET_COMPRESSION</a></span></code> |
| <div class="block">Mostly the same with the above <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#ERROR_AND_RESET"><code>ERROR_AND_RESET</code></a>, the difference is that here we also |
| mess up the compression dictionary when reading data, so the upper layer should also clear |
| the compression context when reseting, which means when calling resetTo method, we need to |
| skip to the position instead of just seek to, which will impact performance.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#NORMAL">NORMAL</a></span></code> |
| <div class="block">This means we read an Entry without any error</div> |
| </td> |
| </tr> |
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| </li> |
| </ul> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
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| <td class="colFirst"><code>private <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.Result.html" title="class in org.apache.hadoop.hbase.wal">WALTailingReader.Result</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#result">result</a></span></code> |
| <div class="block">A dummy result for returning, as except <code>NORMAL</code>, for other state we do not need to |
| provide fields other than state in the returned <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.Result.html" title="class in org.apache.hadoop.hbase.wal"><code>WALTailingReader.Result</code></a>.</div> |
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| <th class="colLast" scope="col">Method and Description</th> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#eof--">eof</a></span>()</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.Result.html" title="class in org.apache.hadoop.hbase.wal">WALTailingReader.Result</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#getResult--">getResult</a></span>()</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#resetCompression--">resetCompression</a></span>()</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html" title="enum in org.apache.hadoop.hbase.wal">WALTailingReader.State</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#valueOf-java.lang.String-">valueOf</a></span>(<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)</code> |
| <div class="block">Returns the enum constant of this type with the specified name.</div> |
| </td> |
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| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html" title="enum in org.apache.hadoop.hbase.wal">WALTailingReader.State</a>[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#values--">values</a></span>()</code> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
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| <a name="NORMAL"> |
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| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>NORMAL</h4> |
| <pre>public static final <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html" title="enum in org.apache.hadoop.hbase.wal">WALTailingReader.State</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALTailingReader.State.html#line.34">NORMAL</a></pre> |
| <div class="block">This means we read an Entry without any error</div> |
| </li> |
| </ul> |
| <a name="EOF_WITH_TRAILER"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>EOF_WITH_TRAILER</h4> |
| <pre>public static final <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html" title="enum in org.apache.hadoop.hbase.wal">WALTailingReader.State</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALTailingReader.State.html#line.39">EOF_WITH_TRAILER</a></pre> |
| <div class="block">This means the WAL file has a trailer and we have reached it, which means we have finished |
| reading this file normally</div> |
| </li> |
| </ul> |
| <a name="ERROR_AND_RESET"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>ERROR_AND_RESET</h4> |
| <pre>public static final <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html" title="enum in org.apache.hadoop.hbase.wal">WALTailingReader.State</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALTailingReader.State.html#line.43">ERROR_AND_RESET</a></pre> |
| <div class="block">This means we meet an error so the upper layer need to reset to read again</div> |
| </li> |
| </ul> |
| <a name="ERROR_AND_RESET_COMPRESSION"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>ERROR_AND_RESET_COMPRESSION</h4> |
| <pre>public static final <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html" title="enum in org.apache.hadoop.hbase.wal">WALTailingReader.State</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALTailingReader.State.html#line.50">ERROR_AND_RESET_COMPRESSION</a></pre> |
| <div class="block">Mostly the same with the above <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#ERROR_AND_RESET"><code>ERROR_AND_RESET</code></a>, the difference is that here we also |
| mess up the compression dictionary when reading data, so the upper layer should also clear |
| the compression context when reseting, which means when calling resetTo method, we need to |
| skip to the position instead of just seek to, which will impact performance.</div> |
| </li> |
| </ul> |
| <a name="EOF_AND_RESET"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>EOF_AND_RESET</h4> |
| <pre>public static final <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html" title="enum in org.apache.hadoop.hbase.wal">WALTailingReader.State</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALTailingReader.State.html#line.56">EOF_AND_RESET</a></pre> |
| <div class="block">This means we reach the EOF and the upper layer need to reset to see if there is more data. |
| Notice that this does not mean that there is necessarily more data, the upper layer should |
| determine whether they need to reset and read again.</div> |
| </li> |
| </ul> |
| <a name="EOF_AND_RESET_COMPRESSION"> |
| <!-- --> |
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| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>EOF_AND_RESET_COMPRESSION</h4> |
| <pre>public static final <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html" title="enum in org.apache.hadoop.hbase.wal">WALTailingReader.State</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALTailingReader.State.html#line.64">EOF_AND_RESET_COMPRESSION</a></pre> |
| <div class="block">Mostly the same with the above <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html#EOF_AND_RESET"><code>EOF_AND_RESET</code></a>, the difference is that here we also |
| mess up the compression dictionary when reading data, so the upper layer should also clear |
| the compression context when reseting, which means when calling resetTo method, we need to |
| skip to the position instead of just seek to, which will impact performance. The |
| implementation should try its best to not fall into this situation.</div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| <!-- ============ FIELD DETAIL =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="field.detail"> |
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| </a> |
| <h3>Field Detail</h3> |
| <a name="result"> |
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| </a> |
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| <h4>result</h4> |
| <pre>private <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.Result.html" title="class in org.apache.hadoop.hbase.wal">WALTailingReader.Result</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALTailingReader.State.html#line.70">result</a></pre> |
| <div class="block">A dummy result for returning, as except <code>NORMAL</code>, for other state we do not need to |
| provide fields other than state in the returned <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.Result.html" title="class in org.apache.hadoop.hbase.wal"><code>WALTailingReader.Result</code></a>.</div> |
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| <pre>public static <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html" title="enum in org.apache.hadoop.hbase.wal">WALTailingReader.State</a>[] <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALTailingReader.State.html#line.148">values</a>()</pre> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared. This method may be used to iterate |
| over the constants as follows: |
| <pre> |
| for (WALTailingReader.State c : WALTailingReader.State.values()) |
| System.out.println(c); |
| </pre></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an array containing the constants of this enum type, in the order they are declared</dd> |
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| <h4>valueOf</h4> |
| <pre>public static <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.State.html" title="enum in org.apache.hadoop.hbase.wal">WALTailingReader.State</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALTailingReader.State.html#line.148">valueOf</a>(<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)</pre> |
| <div class="block">Returns the enum constant of this type with the specified name. |
| The string must match <i>exactly</i> an identifier used to declare an |
| enum constant in this type. (Extraneous whitespace characters are |
| not permitted.)</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>name</code> - the name of the enum constant to be returned.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the enum constant with the specified name</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if this enum type has no constant with the specified name</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - if the argument is null</dd> |
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| <h4>getResult</h4> |
| <pre>public <a href="../../../../../org/apache/hadoop/hbase/wal/WALTailingReader.Result.html" title="class in org.apache.hadoop.hbase.wal">WALTailingReader.Result</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALTailingReader.State.html#line.72">getResult</a>()</pre> |
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| <h4>resetCompression</h4> |
| <pre>public boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALTailingReader.State.html#line.76">resetCompression</a>()</pre> |
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| <h4>eof</h4> |
| <pre>public boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/wal/WALTailingReader.State.html#line.80">eof</a>()</pre> |
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