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<div class="subTitle">org.apache.hawq.pxf.plugins.hdfs</div>
<h2 title="Class HdfsSplittableDataAccessor" class="title">Class HdfsSplittableDataAccessor</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li><a href="../../../../../../org/apache/hawq/pxf/api/utilities/Plugin.html" title="class in org.apache.hawq.pxf.api.utilities">org.apache.hawq.pxf.api.utilities.Plugin</a></li>
<li>
<ul class="inheritance">
<li>org.apache.hawq.pxf.plugins.hdfs.HdfsSplittableDataAccessor</li>
</ul>
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<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../../../org/apache/hawq/pxf/api/ReadAccessor.html" title="interface in org.apache.hawq.pxf.api">ReadAccessor</a></dd>
</dl>
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/AvroFileAccessor.html" title="class in org.apache.hawq.pxf.plugins.hdfs">AvroFileAccessor</a>, <a href="../../../../../../org/apache/hawq/pxf/plugins/hive/HiveAccessor.html" title="class in org.apache.hawq.pxf.plugins.hive">HiveAccessor</a>, <a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/LineBreakAccessor.html" title="class in org.apache.hawq.pxf.plugins.hdfs">LineBreakAccessor</a>, <a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/SequenceFileAccessor.html" title="class in org.apache.hawq.pxf.plugins.hdfs">SequenceFileAccessor</a></dd>
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<pre>public abstract class <span class="typeNameLabel">HdfsSplittableDataAccessor</span>
extends <a href="../../../../../../org/apache/hawq/pxf/api/utilities/Plugin.html" title="class in org.apache.hawq.pxf.api.utilities">Plugin</a>
implements <a href="../../../../../../org/apache/hawq/pxf/api/ReadAccessor.html" title="interface in org.apache.hawq.pxf.api">ReadAccessor</a></pre>
<div class="block">Accessor for accessing a splittable HDFS data sources. HDFS will divide the
file into splits based on an internal decision (by default, the block size is
also the split size).
Accessors that require such base functionality should extend this class.</div>
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<h3>Field Summary</h3>
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<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<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>protected org.apache.hadoop.conf.Configuration</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/HdfsSplittableDataAccessor.html#conf">conf</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/HdfsSplittableDataAccessor.html#data">data</a></span></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected org.apache.hadoop.mapred.InputFormat&lt;?,?&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/HdfsSplittableDataAccessor.html#inputFormat">inputFormat</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected java.util.ListIterator&lt;org.apache.hadoop.mapred.InputSplit&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/HdfsSplittableDataAccessor.html#iter">iter</a></span></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected org.apache.hadoop.mapred.JobConf</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/HdfsSplittableDataAccessor.html#jobConf">jobConf</a></span></code>&nbsp;</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/HdfsSplittableDataAccessor.html#key">key</a></span></code>&nbsp;</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected org.apache.hadoop.mapred.RecordReader&lt;java.lang.Object,java.lang.Object&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/HdfsSplittableDataAccessor.html#reader">reader</a></span></code>&nbsp;</td>
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<h3>Fields inherited from class&nbsp;org.apache.hawq.pxf.api.utilities.<a href="../../../../../../org/apache/hawq/pxf/api/utilities/Plugin.html" title="class in org.apache.hawq.pxf.api.utilities">Plugin</a></h3>
<code><a href="../../../../../../org/apache/hawq/pxf/api/utilities/Plugin.html#inputData">inputData</a></code></li>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/HdfsSplittableDataAccessor.html#HdfsSplittableDataAccessor-org.apache.hawq.pxf.api.utilities.InputData-org.apache.hadoop.mapred.InputFormat-">HdfsSplittableDataAccessor</a></span>(<a href="../../../../../../org/apache/hawq/pxf/api/utilities/InputData.html" title="class in org.apache.hawq.pxf.api.utilities">InputData</a>&nbsp;input,
org.apache.hadoop.mapred.InputFormat&lt;?,?&gt;&nbsp;inFormat)</code>
<div class="block">Constructs an HdfsSplittableDataAccessor</div>
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<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/hawq/pxf/plugins/hdfs/HdfsSplittableDataAccessor.html#closeForRead--">closeForRead</a></span>()</code>
<div class="block">When user finished reading the file, it closes the RecordReader</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>protected boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/HdfsSplittableDataAccessor.html#getNextSplit--">getNextSplit</a></span>()</code>
<div class="block">Sets the current split and initializes a RecordReader who feeds from the
split</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>protected abstract java.lang.Object</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/HdfsSplittableDataAccessor.html#getReader-org.apache.hadoop.mapred.JobConf-org.apache.hadoop.mapred.InputSplit-">getReader</a></span>(org.apache.hadoop.mapred.JobConf&nbsp;jobConf,
org.apache.hadoop.mapred.InputSplit&nbsp;split)</code>
<div class="block">Specialized accessors will override this method and implement their own
recordReader.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/HdfsSplittableDataAccessor.html#isThreadSafe--">isThreadSafe</a></span>()</code>
<div class="block">Checks if the plugin is thread safe or not, based on inputData.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/HdfsSplittableDataAccessor.html#openForRead--">openForRead</a></span>()</code>
<div class="block">Fetches the requested fragment (file split) for the current client
request, and sets a record reader for the job.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../org/apache/hawq/pxf/api/OneRow.html" title="class in org.apache.hawq.pxf.api">OneRow</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hawq/pxf/plugins/hdfs/HdfsSplittableDataAccessor.html#readNextObject--">readNextObject</a></span>()</code>
<div class="block">Fetches one record from the file.</div>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h3>Field Detail</h3>
<a name="conf">
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<h4>conf</h4>
<pre>protected&nbsp;org.apache.hadoop.conf.Configuration conf</pre>
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<a name="reader">
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<h4>reader</h4>
<pre>protected&nbsp;org.apache.hadoop.mapred.RecordReader&lt;java.lang.Object,java.lang.Object&gt; reader</pre>
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<a name="inputFormat">
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<h4>inputFormat</h4>
<pre>protected&nbsp;org.apache.hadoop.mapred.InputFormat&lt;?,?&gt; inputFormat</pre>
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<a name="iter">
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<h4>iter</h4>
<pre>protected&nbsp;java.util.ListIterator&lt;org.apache.hadoop.mapred.InputSplit&gt; iter</pre>
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<a name="jobConf">
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<h4>jobConf</h4>
<pre>protected&nbsp;org.apache.hadoop.mapred.JobConf jobConf</pre>
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<a name="key">
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<h4>key</h4>
<pre>protected&nbsp;java.lang.Object key</pre>
</li>
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<h4>data</h4>
<pre>protected&nbsp;java.lang.Object data</pre>
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<ul class="blockList">
<li class="blockList"><a name="constructor.detail">
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<h3>Constructor Detail</h3>
<a name="HdfsSplittableDataAccessor-org.apache.hawq.pxf.api.utilities.InputData-org.apache.hadoop.mapred.InputFormat-">
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<h4>HdfsSplittableDataAccessor</h4>
<pre>public&nbsp;HdfsSplittableDataAccessor(<a href="../../../../../../org/apache/hawq/pxf/api/utilities/InputData.html" title="class in org.apache.hawq.pxf.api.utilities">InputData</a>&nbsp;input,
org.apache.hadoop.mapred.InputFormat&lt;?,?&gt;&nbsp;inFormat)</pre>
<div class="block">Constructs an HdfsSplittableDataAccessor</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>input</code> - all input parameters coming from the client request</dd>
<dd><code>inFormat</code> - the HDFS <code>InputFormat</code> the caller wants to use</dd>
</dl>
</li>
</ul>
</li>
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<h3>Method Detail</h3>
<a name="openForRead--">
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<h4>openForRead</h4>
<pre>public&nbsp;boolean&nbsp;openForRead()
throws java.lang.Exception</pre>
<div class="block">Fetches the requested fragment (file split) for the current client
request, and sets a record reader for the job.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hawq/pxf/api/ReadAccessor.html#openForRead--">openForRead</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hawq/pxf/api/ReadAccessor.html" title="interface in org.apache.hawq.pxf.api">ReadAccessor</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if succeeded, false if no more splits to be read</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.Exception</code> - if opening the resource failed</dd>
</dl>
</li>
</ul>
<a name="getReader-org.apache.hadoop.mapred.JobConf-org.apache.hadoop.mapred.InputSplit-">
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<h4>getReader</h4>
<pre>protected abstract&nbsp;java.lang.Object&nbsp;getReader(org.apache.hadoop.mapred.JobConf&nbsp;jobConf,
org.apache.hadoop.mapred.InputSplit&nbsp;split)
throws java.io.IOException</pre>
<div class="block">Specialized accessors will override this method and implement their own
recordReader. For example, a plain delimited text accessor may want to
return a LineRecordReader.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>jobConf</code> - the hadoop jobconf to use for the selected InputFormat</dd>
<dd><code>split</code> - the input split to be read by the accessor</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a recordreader to be used for reading the data records of the
split</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code> - if recordreader could not be created</dd>
</dl>
</li>
</ul>
<a name="getNextSplit--">
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<ul class="blockList">
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<h4>getNextSplit</h4>
<pre>protected&nbsp;boolean&nbsp;getNextSplit()
throws java.io.IOException</pre>
<div class="block">Sets the current split and initializes a RecordReader who feeds from the
split</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if there is a split to read</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code> - if record reader could not be created</dd>
</dl>
</li>
</ul>
<a name="readNextObject--">
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<h4>readNextObject</h4>
<pre>public&nbsp;<a href="../../../../../../org/apache/hawq/pxf/api/OneRow.html" title="class in org.apache.hawq.pxf.api">OneRow</a>&nbsp;readNextObject()
throws java.io.IOException</pre>
<div class="block">Fetches one record from the file. The record is returned as a Java
object.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hawq/pxf/api/ReadAccessor.html#readNextObject--">readNextObject</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hawq/pxf/api/ReadAccessor.html" title="interface in org.apache.hawq.pxf.api">ReadAccessor</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the object which was read</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.io.IOException</code></dd>
</dl>
</li>
</ul>
<a name="closeForRead--">
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</a>
<ul class="blockList">
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<h4>closeForRead</h4>
<pre>public&nbsp;void&nbsp;closeForRead()
throws java.lang.Exception</pre>
<div class="block">When user finished reading the file, it closes the RecordReader</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../../org/apache/hawq/pxf/api/ReadAccessor.html#closeForRead--">closeForRead</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../../org/apache/hawq/pxf/api/ReadAccessor.html" title="interface in org.apache.hawq.pxf.api">ReadAccessor</a></code></dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.Exception</code> - if closing the resource failed</dd>
</dl>
</li>
</ul>
<a name="isThreadSafe--">
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<h4>isThreadSafe</h4>
<pre>public&nbsp;boolean&nbsp;isThreadSafe()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../../org/apache/hawq/pxf/api/utilities/Plugin.html#isThreadSafe--">Plugin</a></code></span></div>
<div class="block">Checks if the plugin is thread safe or not, based on inputData.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../../org/apache/hawq/pxf/api/utilities/Plugin.html#isThreadSafe--">isThreadSafe</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../../org/apache/hawq/pxf/api/utilities/Plugin.html" title="class in org.apache.hawq.pxf.api.utilities">Plugin</a></code></dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if plugin is thread safe</dd>
</dl>
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