mirror of https://github.com/apache/lucene.git
clarify limitations of implementation vs file format itself
git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@761886 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael McCandless
parent
47ee1d3c27
commit
3fc80aa239
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@ -2430,12 +2430,23 @@ document.write("Last Published: " + document.lastModified);
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<a name="N10873"></a><a name="Limitations"></a>
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<h2 class="boxed">Limitations</h2>
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<div class="section">
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<p>There
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are a few places where these file formats limit the maximum number of
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terms and documents to a 32-bit quantity, or to approximately 4
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billion. This is not today a problem, but, in the long term,
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probably will be. These should therefore be replaced with either
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UInt64 values, or better yet, with VInt values which have no limit.
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<p>
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When referring to term numbers, Lucene's current
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implementation uses a Java <span class="codefrag">int</span>, which means
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the maximum number of unique terms in any single index
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segment is 2,147,483,648. This is technically not a
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limitation of the index file format, just of Lucene's
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current implementation.
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</p>
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<p>
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Similarly, Lucene uses a Java <span class="codefrag">int</span> to refer
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to document numbers, and the index file format uses an
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<span class="codefrag">Int32</span> on-disk to store document numbers.
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This is a limitation of both the index file format and
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the current implementation. Eventually these should be
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replaced with either <span class="codefrag">UInt64</span> values, or
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better yet, <span class="codefrag">VInt</span> values which have no
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limit.
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</p>
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</div>
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|
||||
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|
||||
/Title (\376\377\0\65\0\56\0\63\0\40\0\125\0\151\0\156\0\164\0\66\0\64)
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
<<
|
||||
/Title (\376\377\0\65\0\56\0\66\0\40\0\123\0\164\0\162\0\151\0\156\0\147)
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
/Next 121 0 R
|
||||
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|
||||
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|
||||
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|
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<<
|
||||
/Title (\376\377\0\66\0\40\0\120\0\145\0\162\0\55\0\111\0\156\0\144\0\145\0\170\0\40\0\106\0\151\0\154\0\145\0\163)
|
||||
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|
||||
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||||
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|
||||
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|
||||
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||||
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||||
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|
||||
/Title (\376\377\0\65\0\56\0\65\0\40\0\103\0\150\0\141\0\162\0\163)
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
<<
|
||||
/Title (\376\377\0\66\0\56\0\61\0\40\0\123\0\145\0\147\0\155\0\145\0\156\0\164\0\163\0\40\0\106\0\151\0\154\0\145)
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||||
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|
||||
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|
||||
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||||
/Title (\376\377\0\65\0\56\0\66\0\40\0\123\0\164\0\162\0\151\0\156\0\147)
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||||
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|
||||
/Prev 121 0 R
|
||||
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|
||||
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|
||||
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|
||||
<<
|
||||
/Title (\376\377\0\66\0\56\0\62\0\40\0\114\0\157\0\143\0\153\0\40\0\106\0\151\0\154\0\145)
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||||
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||||
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||||
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||||
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||||
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|
||||
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||||
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|
||||
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||||
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|
||||
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||||
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||||
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<<
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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<<
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||||
/Title (\376\377\0\66\0\56\0\64\0\40\0\103\0\157\0\155\0\160\0\157\0\165\0\156\0\144\0\40\0\106\0\151\0\154\0\145\0\163)
|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
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<<
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||||
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|
||||
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||||
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|
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||||
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||||
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||||
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|
|
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|||
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>>
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@ -1107,82 +1122,82 @@ endobj
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|||
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|
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>>
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||||
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|
|
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|
|||
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|
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0000044791 00000 n
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
0000049102 00000 n
|
||||
0000049213 00000 n
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
0000049891 00000 n
|
||||
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|
||||
0000050116 00000 n
|
||||
0000050228 00000 n
|
||||
0000050337 00000 n
|
||||
0000050444 00000 n
|
||||
0000050561 00000 n
|
||||
trailer
|
||||
<<
|
||||
/Size 142
|
||||
/Size 144
|
||||
/Root 2 0 R
|
||||
/Info 4 0 R
|
||||
>>
|
||||
startxref
|
||||
52148
|
||||
53059
|
||||
%%EOF
|
||||
|
|
|
|||
|
|
@ -1802,12 +1802,23 @@
|
|||
|
||||
<section id="Limitations"><title>Limitations</title>
|
||||
|
||||
<p>There
|
||||
are a few places where these file formats limit the maximum number of
|
||||
terms and documents to a 32-bit quantity, or to approximately 4
|
||||
billion. This is not today a problem, but, in the long term,
|
||||
probably will be. These should therefore be replaced with either
|
||||
UInt64 values, or better yet, with VInt values which have no limit.
|
||||
<p>
|
||||
When referring to term numbers, Lucene's current
|
||||
implementation uses a Java <code>int</code>, which means
|
||||
the maximum number of unique terms in any single index
|
||||
segment is 2,147,483,648. This is technically not a
|
||||
limitation of the index file format, just of Lucene's
|
||||
current implementation.
|
||||
</p>
|
||||
<p>
|
||||
Similarly, Lucene uses a Java <code>int</code> to refer
|
||||
to document numbers, and the index file format uses an
|
||||
<code>Int32</code> on-disk to store document numbers.
|
||||
This is a limitation of both the index file format and
|
||||
the current implementation. Eventually these should be
|
||||
replaced with either <code>UInt64</code> values, or
|
||||
better yet, <code>VInt</code> values which have no
|
||||
limit.
|
||||
</p>
|
||||
|
||||
</section>
|
||||
|
|
|
|||
Loading…
Reference in New Issue