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<article class="content wrap" id="_content" data-uid="Lucene.Net.Index.ParallelCompositeReader">
<h1 id="Lucene_Net_Index_ParallelCompositeReader" data-uid="Lucene.Net.Index.ParallelCompositeReader" class="text-break">Class ParallelCompositeReader
</h1>
<div class="markdown level0 summary"><p>A <a class="xref" href="Lucene.Net.Index.CompositeReader.html">CompositeReader</a> which reads multiple, parallel indexes. Each index added
must have the same number of documents, and exactly the same hierarchical subreader structure,
but typically each contains different fields. Deletions are taken from the first reader.
Each document contains the union of the fields of all
documents with the same document number. When searching, matches for a
query term are from the first index added that has the field.</p>
<p><p>This is useful, e.g., with collections that have large fields which
change rarely and small fields that change more frequently. The smaller
fields may be re-indexed in a new index and both indexes may be searched
together.</p>
<p><p><strong>Warning:</strong> It is up to you to make sure all indexes
are created and modified the same way. For example, if you add
documents to one index, you need to add the same documents in the
same order to the other indexes. <em>Failure to do so will result in
undefined behavior</em>.
A good strategy to create suitable indexes with <a class="xref" href="Lucene.Net.Index.IndexWriter.html">IndexWriter</a> is to use
<a class="xref" href="Lucene.Net.Index.LogDocMergePolicy.html">LogDocMergePolicy</a>, as this one does not reorder documents
during merging (like <a class="xref" href="Lucene.Net.Index.TieredMergePolicy.html">TieredMergePolicy</a>) and triggers merges
by number of documents per segment. If you use different <a class="xref" href="Lucene.Net.Index.MergePolicy.html">MergePolicy</a>s
it might happen that the segment structure of your index is no longer predictable.</p>
</div>
<div class="markdown level0 conceptual"></div>
<div class="inheritance">
<h5>Inheritance</h5>
<div class="level0"><span class="xref">System.Object</span></div>
<div class="level1"><a class="xref" href="Lucene.Net.Index.IndexReader.html">IndexReader</a></div>
<div class="level2"><a class="xref" href="Lucene.Net.Index.CompositeReader.html">CompositeReader</a></div>
<div class="level3"><a class="xref" href="Lucene.Net.Index.BaseCompositeReader-1.html">BaseCompositeReader</a>&lt;<a class="xref" href="Lucene.Net.Index.IndexReader.html">IndexReader</a>&gt;</div>
<div class="level4"><span class="xref">ParallelCompositeReader</span></div>
</div>
<div classs="implements">
<h5>Implements</h5>
<div><span class="xref">System.IDisposable</span></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<a class="xref" href="Lucene.Net.Index.BaseCompositeReader-1.html#Lucene_Net_Index_BaseCompositeReader_1_GetTermVectors_System_Int32_">BaseCompositeReader&lt;IndexReader&gt;.GetTermVectors(Int32)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.BaseCompositeReader-1.html#Lucene_Net_Index_BaseCompositeReader_1_NumDocs">BaseCompositeReader&lt;IndexReader&gt;.NumDocs</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.BaseCompositeReader-1.html#Lucene_Net_Index_BaseCompositeReader_1_MaxDoc">BaseCompositeReader&lt;IndexReader&gt;.MaxDoc</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.BaseCompositeReader-1.html#Lucene_Net_Index_BaseCompositeReader_1_Document_System_Int32_Lucene_Net_Index_StoredFieldVisitor_">BaseCompositeReader&lt;IndexReader&gt;.Document(Int32, StoredFieldVisitor)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.BaseCompositeReader-1.html#Lucene_Net_Index_BaseCompositeReader_1_DocFreq_Lucene_Net_Index_Term_">BaseCompositeReader&lt;IndexReader&gt;.DocFreq(Term)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.BaseCompositeReader-1.html#Lucene_Net_Index_BaseCompositeReader_1_TotalTermFreq_Lucene_Net_Index_Term_">BaseCompositeReader&lt;IndexReader&gt;.TotalTermFreq(Term)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.BaseCompositeReader-1.html#Lucene_Net_Index_BaseCompositeReader_1_GetSumDocFreq_System_String_">BaseCompositeReader&lt;IndexReader&gt;.GetSumDocFreq(String)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.BaseCompositeReader-1.html#Lucene_Net_Index_BaseCompositeReader_1_GetDocCount_System_String_">BaseCompositeReader&lt;IndexReader&gt;.GetDocCount(String)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.BaseCompositeReader-1.html#Lucene_Net_Index_BaseCompositeReader_1_GetSumTotalTermFreq_System_String_">BaseCompositeReader&lt;IndexReader&gt;.GetSumTotalTermFreq(String)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.BaseCompositeReader-1.html#Lucene_Net_Index_BaseCompositeReader_1_ReaderIndex_System_Int32_">BaseCompositeReader&lt;IndexReader&gt;.ReaderIndex(Int32)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.BaseCompositeReader-1.html#Lucene_Net_Index_BaseCompositeReader_1_ReaderBase_System_Int32_">BaseCompositeReader&lt;IndexReader&gt;.ReaderBase(Int32)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.BaseCompositeReader-1.html#Lucene_Net_Index_BaseCompositeReader_1_GetSequentialSubReaders">BaseCompositeReader&lt;IndexReader&gt;.GetSequentialSubReaders()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.CompositeReader.html#Lucene_Net_Index_CompositeReader_ToString">CompositeReader.ToString()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.CompositeReader.html#Lucene_Net_Index_CompositeReader_Context">CompositeReader.Context</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_AddReaderClosedListener_Lucene_Net_Index_IndexReader_IReaderClosedListener_">IndexReader.AddReaderClosedListener(IndexReader.IReaderClosedListener)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_RemoveReaderClosedListener_Lucene_Net_Index_IndexReader_IReaderClosedListener_">IndexReader.RemoveReaderClosedListener(IndexReader.IReaderClosedListener)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_RegisterParentReader_Lucene_Net_Index_IndexReader_">IndexReader.RegisterParentReader(IndexReader)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_RefCount">IndexReader.RefCount</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_IncRef">IndexReader.IncRef()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_TryIncRef">IndexReader.TryIncRef()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_DecRef">IndexReader.DecRef()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_EnsureOpen">IndexReader.EnsureOpen()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Equals_System_Object_">IndexReader.Equals(Object)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_GetHashCode">IndexReader.GetHashCode()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Open_Lucene_Net_Store_Directory_">IndexReader.Open(Directory)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Open_Lucene_Net_Store_Directory_System_Int32_">IndexReader.Open(Directory, Int32)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Open_Lucene_Net_Index_IndexWriter_System_Boolean_">IndexReader.Open(IndexWriter, Boolean)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Open_Lucene_Net_Index_IndexCommit_">IndexReader.Open(IndexCommit)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Open_Lucene_Net_Index_IndexCommit_System_Int32_">IndexReader.Open(IndexCommit, Int32)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_GetTermVector_System_Int32_System_String_">IndexReader.GetTermVector(Int32, String)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_NumDeletedDocs">IndexReader.NumDeletedDocs</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Document_System_Int32_">IndexReader.Document(Int32)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Document_System_Int32_System_Collections_Generic_ISet_System_String__">IndexReader.Document(Int32, ISet&lt;String&gt;)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_HasDeletions">IndexReader.HasDeletions</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Dispose">IndexReader.Dispose()</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Dispose_System_Boolean_">IndexReader.Dispose(Boolean)</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Leaves">IndexReader.Leaves</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_CoreCacheKey">IndexReader.CoreCacheKey</a>
</div>
<div>
<a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_CombinedCoreAndDeletesKey">IndexReader.CombinedCoreAndDeletesKey</a>
</div>
<div>
<span class="xref">System.Object.Equals(System.Object, System.Object)</span>
</div>
<div>
<span class="xref">System.Object.GetType()</span>
</div>
<div>
<span class="xref">System.Object.MemberwiseClone()</span>
</div>
<div>
<span class="xref">System.Object.ReferenceEquals(System.Object, System.Object)</span>
</div>
</div>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Index.html">Lucene.Net.Index</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.dll</h6>
<h5 id="Lucene_Net_Index_ParallelCompositeReader_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public class ParallelCompositeReader : BaseCompositeReader&lt;IndexReader&gt;, IDisposable</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
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<a id="Lucene_Net_Index_ParallelCompositeReader__ctor_" data-uid="Lucene.Net.Index.ParallelCompositeReader.#ctor*"></a>
<h4 id="Lucene_Net_Index_ParallelCompositeReader__ctor_Lucene_Net_Index_CompositeReader___" data-uid="Lucene.Net.Index.ParallelCompositeReader.#ctor(Lucene.Net.Index.CompositeReader[])">ParallelCompositeReader(CompositeReader[])</h4>
<div class="markdown level1 summary"><p>Create a <a class="xref" href="Lucene.Net.Index.ParallelCompositeReader.html">ParallelCompositeReader</a> based on the provided
readers; auto-disposes the given <code data-dev-comment-type="paramref" class="paramref">readers</code> on <a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_Dispose">Dispose()</a>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public ParallelCompositeReader(params CompositeReader[] readers)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a class="xref" href="Lucene.Net.Index.CompositeReader.html">CompositeReader</a>[]</td>
<td><span class="parametername">readers</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Index_ParallelCompositeReader__ctor_" data-uid="Lucene.Net.Index.ParallelCompositeReader.#ctor*"></a>
<h4 id="Lucene_Net_Index_ParallelCompositeReader__ctor_System_Boolean_Lucene_Net_Index_CompositeReader___" data-uid="Lucene.Net.Index.ParallelCompositeReader.#ctor(System.Boolean,Lucene.Net.Index.CompositeReader[])">ParallelCompositeReader(Boolean, CompositeReader[])</h4>
<div class="markdown level1 summary"><p>Create a <a class="xref" href="Lucene.Net.Index.ParallelCompositeReader.html">ParallelCompositeReader</a> based on the provided
<code data-dev-comment-type="paramref" class="paramref">readers</code>.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public ParallelCompositeReader(bool closeSubReaders, params CompositeReader[] readers)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">closeSubReaders</span></td>
<td></td>
</tr>
<tr>
<td><a class="xref" href="Lucene.Net.Index.CompositeReader.html">CompositeReader</a>[]</td>
<td><span class="parametername">readers</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Index_ParallelCompositeReader__ctor_" data-uid="Lucene.Net.Index.ParallelCompositeReader.#ctor*"></a>
<h4 id="Lucene_Net_Index_ParallelCompositeReader__ctor_System_Boolean_Lucene_Net_Index_CompositeReader___Lucene_Net_Index_CompositeReader___" data-uid="Lucene.Net.Index.ParallelCompositeReader.#ctor(System.Boolean,Lucene.Net.Index.CompositeReader[],Lucene.Net.Index.CompositeReader[])">ParallelCompositeReader(Boolean, CompositeReader[], CompositeReader[])</h4>
<div class="markdown level1 summary"><p>Expert: create a <a class="xref" href="Lucene.Net.Index.ParallelCompositeReader.html">ParallelCompositeReader</a> based on the provided
<code data-dev-comment-type="paramref" class="paramref">readers</code> and <code data-dev-comment-type="paramref" class="paramref">storedFieldReaders</code>; when a document is
loaded, only <code data-dev-comment-type="paramref" class="paramref">storedFieldReaders</code> will be used.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public ParallelCompositeReader(bool closeSubReaders, CompositeReader[] readers, CompositeReader[] storedFieldReaders)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Boolean</span></td>
<td><span class="parametername">closeSubReaders</span></td>
<td></td>
</tr>
<tr>
<td><a class="xref" href="Lucene.Net.Index.CompositeReader.html">CompositeReader</a>[]</td>
<td><span class="parametername">readers</span></td>
<td></td>
</tr>
<tr>
<td><a class="xref" href="Lucene.Net.Index.CompositeReader.html">CompositeReader</a>[]</td>
<td><span class="parametername">storedFieldReaders</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
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<h4 id="Lucene_Net_Index_ParallelCompositeReader_DoClose" data-uid="Lucene.Net.Index.ParallelCompositeReader.DoClose">DoClose()</h4>
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<h5 class="decalaration">Declaration</h5>
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<pre><code class="lang-csharp hljs">protected override void DoClose()</code></pre>
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<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Index.IndexReader.html#Lucene_Net_Index_IndexReader_DoClose">IndexReader.DoClose()</a></div>
<h3 id="implements">Implements</h3>
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<span class="xref">System.IDisposable</span>
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