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| <div class="subTitle">org.apache.kudu.client</div> |
| <h2 title="Class AsyncKuduScanner" class="title">Class AsyncKuduScanner</h2> |
| </div> |
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| <ul class="inheritance"> |
| <li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.kudu.client.AsyncKuduScanner</li> |
| </ul> |
| </li> |
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| <div class="description"> |
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| <br> |
| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Unstable |
| public final class <span class="typeNameLabel">AsyncKuduScanner</span> |
| 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">Creates a scanner to read data from Kudu. |
| <p> |
| This class is <strong>not synchronized</strong> as it's expected to be |
| used from a single thread at a time. It's rarely (if ever?) useful to |
| scan concurrently from a shared scanner using multiple threads. If you |
| want to optimize large table scans using extra parallelism, create a few |
| scanners through the <a href="../../../../org/apache/kudu/client/KuduScanToken.html" title="class in org.apache.kudu.client"><code>KuduScanToken</code></a> API. Or use MapReduce. |
| <p> |
| There's no method in this class to explicitly open the scanner. It will open |
| itself automatically when you start scanning by calling <a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#nextRows--"><code>nextRows()</code></a>. |
| Also, the scanner will automatically call <a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#close--"><code>close()</code></a> when it reaches the |
| end key. If, however, you would like to stop scanning <i>before reaching the |
| end key</i>, you <b>must</b> call <a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#close--"><code>close()</code></a> before disposing of the scanner. |
| Note that it's always safe to call <a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#close--"><code>close()</code></a> on a scanner. |
| <p> |
| A <code>AsyncKuduScanner</code> is not re-usable. Should you want to scan the same rows |
| or the same table again, you must create a new one. |
| |
| <h1>A note on passing <code>byte</code> arrays in argument</h1> |
| None of the method that receive a <code>byte[]</code> in argument will copy it. |
| For more info, please refer to the documentation of <code>KuduRpc</code>. |
| <h1>A note on passing <code>String</code>s in argument</h1> |
| All strings are assumed to use the platform's default charset.</div> |
| </li> |
| </ul> |
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| <h3>Nested Class Summary</h3> |
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| <caption><span>Nested Classes</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Class and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.AsyncKuduScannerBuilder.html" title="class in org.apache.kudu.client">AsyncKuduScanner.AsyncKuduScannerBuilder</a></span></code> |
| <div class="block">A Builder class to build <a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html" title="class in org.apache.kudu.client"><code>AsyncKuduScanner</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.ReadMode.html" title="enum in org.apache.kudu.client">AsyncKuduScanner.ReadMode</a></span></code> |
| <div class="block">The possible read modes for scanners.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <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>com.stumbleupon.async.Deferred<<a href="../../../../org/apache/kudu/client/RowResultIterator.html" title="class in org.apache.kudu.client">RowResultIterator</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#close--">close</a></span>()</code> |
| <div class="block">Closes this scanner (don't forget to call this when you're done with it!).</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/kudu/client/AsyncKuduScanner.html#getBatchSizeBytes--">getBatchSizeBytes</a></span>()</code> |
| <div class="block">Returns the maximum number of bytes returned by the scanner, on each batch.</div> |
| </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/kudu/client/AsyncKuduScanner.html#getCacheBlocks--">getCacheBlocks</a></span>()</code> |
| <div class="block">Returns if this scanner was configured to cache data blocks or not.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#getKeepAlivePeriodMs--">getKeepAlivePeriodMs</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#getLimit--">getLimit</a></span>()</code> |
| <div class="block">Returns the maximum number of rows that this scanner was configured to return.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/kudu/Schema.html" title="class in org.apache.kudu">Schema</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#getProjectionSchema--">getProjectionSchema</a></span>()</code> |
| <div class="block">Returns the projection schema of this scanner.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.ReadMode.html" title="enum in org.apache.kudu.client">AsyncKuduScanner.ReadMode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#getReadMode--">getReadMode</a></span>()</code> |
| <div class="block">Returns the ReadMode for this scanner.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/kudu/client/ResourceMetrics.html" title="class in org.apache.kudu.client">ResourceMetrics</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#getResourceMetrics--">getResourceMetrics</a></span>()</code> |
| <div class="block">Returns the <code>ResourceMetrics</code> for this scanner.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#getScanRequestTimeout--">getScanRequestTimeout</a></span>()</code> |
| <div class="block">Returns the scan request timeout for this scanner.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#hasMoreRows--">hasMoreRows</a></span>()</code> |
| <div class="block">Tells if the last rpc returned that there might be more rows to scan.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#isClosed--">isClosed</a></span>()</code> </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>com.stumbleupon.async.Deferred<<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Void.html?is-external=true" title="class or interface in java.lang">Void</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#keepAlive--">keepAlive</a></span>()</code> |
| <div class="block">Keep the current remote scanner alive.</div> |
| </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>com.stumbleupon.async.Deferred<<a href="../../../../org/apache/kudu/client/RowResultIterator.html" title="class in org.apache.kudu.client">RowResultIterator</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#nextRows--">nextRows</a></span>()</code> |
| <div class="block">Scans a number of rows.</div> |
| </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#setReuseRowResult-boolean-">setReuseRowResult</a></span>(boolean reuseRowResult)</code> |
| <div class="block">If set to true, the <a href="../../../../org/apache/kudu/client/RowResult.html" title="class in org.apache.kudu.client"><code>RowResult</code></a> object returned by the <a href="../../../../org/apache/kudu/client/RowResultIterator.html" title="class in org.apache.kudu.client"><code>RowResultIterator</code></a> |
| will be reused with each call to <a href="../../../../org/apache/kudu/client/RowResultIterator.html#next--"><code>RowResultIterator.next()</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i14" class="altColor"> |
| <td class="colFirst"><code><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></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/client/AsyncKuduScanner.html#toString--">toString</a></span>()</code> </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.<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></h3> |
| <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#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> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
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| <li class="blockList"><a name="method.detail"> |
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| <h3>Method Detail</h3> |
| <a name="getLimit--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getLimit</h4> |
| <pre>public long getLimit()</pre> |
| <div class="block">Returns the maximum number of rows that this scanner was configured to return.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a long representing the maximum number of rows that can be returned</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="hasMoreRows--"> |
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| <li class="blockList"> |
| <h4>hasMoreRows</h4> |
| <pre>public boolean hasMoreRows()</pre> |
| <div class="block">Tells if the last rpc returned that there might be more rows to scan.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if there might be more data to scan, else false</dd> |
| </dl> |
| </li> |
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| <a name="getCacheBlocks--"> |
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| <li class="blockList"> |
| <h4>getCacheBlocks</h4> |
| <pre>public boolean getCacheBlocks()</pre> |
| <div class="block">Returns if this scanner was configured to cache data blocks or not.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if this scanner will cache blocks, else else.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getBatchSizeBytes--"> |
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| <li class="blockList"> |
| <h4>getBatchSizeBytes</h4> |
| <pre>public long getBatchSizeBytes()</pre> |
| <div class="block">Returns the maximum number of bytes returned by the scanner, on each batch.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a long representing the maximum number of bytes that a scanner can receive at once |
| from a tablet server</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getReadMode--"> |
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| </a> |
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| <h4>getReadMode</h4> |
| <pre>public <a href="../../../../org/apache/kudu/client/AsyncKuduScanner.ReadMode.html" title="enum in org.apache.kudu.client">AsyncKuduScanner.ReadMode</a> getReadMode()</pre> |
| <div class="block">Returns the ReadMode for this scanner.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the configured read mode for this scanner</dd> |
| </dl> |
| </li> |
| </ul> |
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| <li class="blockList"> |
| <h4>getScanRequestTimeout</h4> |
| <pre>public long getScanRequestTimeout()</pre> |
| <div class="block">Returns the scan request timeout for this scanner.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the scan request timeout, in milliseconds</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getProjectionSchema--"> |
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| </a> |
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| <h4>getProjectionSchema</h4> |
| <pre>public <a href="../../../../org/apache/kudu/Schema.html" title="class in org.apache.kudu">Schema</a> getProjectionSchema()</pre> |
| <div class="block">Returns the projection schema of this scanner. If specific columns were |
| not specified during scanner creation, the table schema is returned.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the projection schema for this scanner</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getKeepAlivePeriodMs--"> |
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| <h4>getKeepAlivePeriodMs</h4> |
| <pre>public long getKeepAlivePeriodMs()</pre> |
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| </a> |
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| <h4>getResourceMetrics</h4> |
| <pre>public <a href="../../../../org/apache/kudu/client/ResourceMetrics.html" title="class in org.apache.kudu.client">ResourceMetrics</a> getResourceMetrics()</pre> |
| <div class="block">Returns the <code>ResourceMetrics</code> for this scanner. These metrics are |
| updated with each batch of rows returned from the server.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the resource metrics for this scanner</dd> |
| </dl> |
| </li> |
| </ul> |
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| </a> |
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| <h4>setReuseRowResult</h4> |
| <pre>public void setReuseRowResult(boolean reuseRowResult)</pre> |
| <div class="block">If set to true, the <a href="../../../../org/apache/kudu/client/RowResult.html" title="class in org.apache.kudu.client"><code>RowResult</code></a> object returned by the <a href="../../../../org/apache/kudu/client/RowResultIterator.html" title="class in org.apache.kudu.client"><code>RowResultIterator</code></a> |
| will be reused with each call to <a href="../../../../org/apache/kudu/client/RowResultIterator.html#next--"><code>RowResultIterator.next()</code></a>. |
| This can be a useful optimization to reduce the number of objects created. |
| |
| Note: DO NOT use this if the RowResult is stored between calls to next(). |
| Enabling this optimization means that a call to next() mutates the previously returned |
| RowResult. Accessing the previously returned RowResult after a call to next(), by storing all |
| RowResults in a collection and accessing them later for example, will lead to all of the |
| stored RowResults being mutated as per the data in the last RowResult returned.</div> |
| </li> |
| </ul> |
| <a name="nextRows--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>nextRows</h4> |
| <pre>public com.stumbleupon.async.Deferred<<a href="../../../../org/apache/kudu/client/RowResultIterator.html" title="class in org.apache.kudu.client">RowResultIterator</a>> nextRows()</pre> |
| <div class="block">Scans a number of rows. |
| <p> |
| Once this method returns <code>null</code> once (which indicates that this |
| <code>Scanner</code> is done scanning), calling it again leads to an undefined |
| behavior.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a deferred list of rows.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="isClosed--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isClosed</h4> |
| <pre>public boolean isClosed()</pre> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if the scanner has been closed.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="close--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>close</h4> |
| <pre>public com.stumbleupon.async.Deferred<<a href="../../../../org/apache/kudu/client/RowResultIterator.html" title="class in org.apache.kudu.client">RowResultIterator</a>> close()</pre> |
| <div class="block">Closes this scanner (don't forget to call this when you're done with it!). |
| <p> |
| Closing a scanner already closed has no effect. The deferred returned |
| will be called back immediately.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A deferred object that indicates the completion of the request. |
| The <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang"><code>Object</code></a> can be null, a RowResultIterator if there was data left |
| in the scanner, or an Exception.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="toString--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>toString</h4> |
| <pre>public <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> toString()</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><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></code> in class <code><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></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="keepAlive--"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>keepAlive</h4> |
| <pre>public com.stumbleupon.async.Deferred<<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Void.html?is-external=true" title="class or interface in java.lang">Void</a>> keepAlive()</pre> |
| <div class="block">Keep the current remote scanner alive. |
| <p> |
| Keep the current remote scanner alive on the Tablet server for an |
| additional time-to-live. This is useful if the interval in between |
| nextRows() calls is big enough that the remote scanner might be garbage |
| collected. The scanner time-to-live can be configured on the tablet |
| server via the --scanner_ttl_ms configuration flag and has a default |
| of 60 seconds. |
| <p> |
| This does not invalidate any previously fetched results. |
| <p> |
| Note that an error returned by this method should not be taken as indication |
| that the scan has failed. Subsequent calls to nextRows() might still be successful, |
| particularly if the scanner is configured to be fault tolerant.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>A deferred object that indicates the completion of the request.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if the scanner is already closed.</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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