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| <div class="subTitle">org.apache.hadoop.hbase.util</div> |
| <h2 title="Class RegionSplitCalculator" class="title">Class RegionSplitCalculator<R extends <a href="../../../../../org/apache/hadoop/hbase/util/KeyRange.html" title="interface in org.apache.hadoop.hbase.util">KeyRange</a>></h2> |
| </div> |
| <div class="contentContainer"> |
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| <li> |
| <ul class="inheritance"> |
| <li>org.apache.hadoop.hbase.util.RegionSplitCalculator<R></li> |
| </ul> |
| </li> |
| </ul> |
| <div class="description"> |
| <ul class="blockList"> |
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| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>R</code> - </dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RegionSplitCalculator.html#line.55">RegionSplitCalculator</a><R extends <a href="../../../../../org/apache/hadoop/hbase/util/KeyRange.html" title="interface in org.apache.hadoop.hbase.util">KeyRange</a>> |
| 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">This is a generic region split calculator. It requires Ranges that provide |
| start, end, and a comparator. It works in two phases -- the first adds ranges |
| and rejects backwards ranges. Then one calls calcRegions to generate the |
| multimap that has a start split key as a key and possibly multiple Ranges as |
| members. |
| |
| To traverse, one normally would get the split set, and iterate through the |
| calcRegions. Normal regions would have only one entry, holes would have zero, |
| and any overlaps would have multiple entries. |
| |
| The interface is a bit cumbersome currently but is exposed this way so that |
| clients can choose how to iterate through the region splits.</div> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- =========== FIELD SUMMARY =========== --> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation"> |
| <caption><span>Fields</span><span class="tabEnd"> </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>static <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a><byte[]></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html#BYTES_COMPARATOR">BYTES_COMPARATOR</a></span></code> </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><code>private static byte[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html#ENDKEY">ENDKEY</a></span></code> |
| <div class="block">SPECIAL CASE</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static org.slf4j.Logger</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html#LOG">LOG</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a><<a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html" title="type parameter in RegionSplitCalculator">R</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html#rangeCmp">rangeCmp</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/TreeSet.html?is-external=true" title="class or interface in java.util">TreeSet</a><byte[]></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html#splits">splits</a></span></code> |
| <div class="block">This contains a sorted set of all the possible split points |
| |
| Invariant: once populated this has 0 entries if empty or at most n+1 values |
| where n == number of added ranges.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private org.apache.hbase.thirdparty.com.google.common.collect.Multimap<byte[],<a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html" title="type parameter in RegionSplitCalculator">R</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html#starts">starts</a></span></code> |
| <div class="block">This is a map from start key to regions with the same start key.</div> |
| </td> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html#RegionSplitCalculator-java.util.Comparator-">RegionSplitCalculator</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a><<a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html" title="type parameter in RegionSplitCalculator">R</a>> cmp)</code> </td> |
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| <h3>Method Summary</h3> |
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| <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>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html#add-R-">add</a></span>(<a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html" title="type parameter in RegionSplitCalculator">R</a> range)</code> |
| <div class="block">Adds an edge to the split calculator</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>org.apache.hbase.thirdparty.com.google.common.collect.Multimap<byte[],<a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html" title="type parameter in RegionSplitCalculator">R</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html#calcCoverage--">calcCoverage</a></span>()</code> |
| <div class="block">Generates a coverage multimap from split key to Regions that start with the |
| split key.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <R extends <a href="../../../../../org/apache/hadoop/hbase/util/KeyRange.html" title="interface in org.apache.hadoop.hbase.util">KeyRange</a>><br><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><R></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html#findBigRanges-java.util.Collection-int-">findBigRanges</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><R> bigOverlap, |
| int count)</code> |
| <div class="block">Find specified number of top ranges in a big overlap group.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/TreeSet.html?is-external=true" title="class or interface in java.util">TreeSet</a><byte[]></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html#getSplits--">getSplits</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>org.apache.hbase.thirdparty.com.google.common.collect.Multimap<byte[],<a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html" title="type parameter in RegionSplitCalculator">R</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html#getStarts--">getStarts</a></span>()</code> </td> |
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| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>private static <R extends <a href="../../../../../org/apache/hadoop/hbase/util/KeyRange.html" title="interface in org.apache.hadoop.hbase.util">KeyRange</a>><br>byte[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html#specialEndKey-R-">specialEndKey</a></span>(R range)</code> |
| <div class="block">SPECIAL CASE wrapper for empty end key</div> |
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| <pre>private static final org.slf4j.Logger <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RegionSplitCalculator.html#line.56">LOG</a></pre> |
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| <pre>private final <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a><<a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html" title="type parameter in RegionSplitCalculator">R</a> extends <a href="../../../../../org/apache/hadoop/hbase/util/KeyRange.html" title="interface in org.apache.hadoop.hbase.util">KeyRange</a>> <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RegionSplitCalculator.html#line.58">rangeCmp</a></pre> |
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| <pre>private final <a href="https://docs.oracle.com/javase/8/docs/api/java/util/TreeSet.html?is-external=true" title="class or interface in java.util">TreeSet</a><byte[]> <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RegionSplitCalculator.html#line.65">splits</a></pre> |
| <div class="block">This contains a sorted set of all the possible split points |
| |
| Invariant: once populated this has 0 entries if empty or at most n+1 values |
| where n == number of added ranges.</div> |
| </li> |
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| <h4>starts</h4> |
| <pre>private final org.apache.hbase.thirdparty.com.google.common.collect.Multimap<byte[],<a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html" title="type parameter in RegionSplitCalculator">R</a> extends <a href="../../../../../org/apache/hadoop/hbase/util/KeyRange.html" title="interface in org.apache.hadoop.hbase.util">KeyRange</a>> <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RegionSplitCalculator.html#line.72">starts</a></pre> |
| <div class="block">This is a map from start key to regions with the same start key. |
| |
| Invariant: This always have n values in total</div> |
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| <pre>private static final byte[] <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RegionSplitCalculator.html#line.77">ENDKEY</a></pre> |
| <div class="block">SPECIAL CASE</div> |
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| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RegionSplitCalculator.html#line.79">RegionSplitCalculator</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Comparator.html?is-external=true" title="class or interface in java.util">Comparator</a><<a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html" title="type parameter in RegionSplitCalculator">R</a>> cmp)</pre> |
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| <div class="block">SPECIAL CASE wrapper for empty end key</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>ENDKEY if end key is empty, else normal endkey.</dd> |
| </dl> |
| </li> |
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| <a name="add-org.apache.hadoop.hbase.util.KeyRange-"> |
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| <div class="block">Adds an edge to the split calculator</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true if is included, false if backwards/invalid</dd> |
| </dl> |
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| <pre>public org.apache.hbase.thirdparty.com.google.common.collect.Multimap<byte[],<a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html" title="type parameter in RegionSplitCalculator">R</a>> <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RegionSplitCalculator.html#line.138">calcCoverage</a>()</pre> |
| <div class="block">Generates a coverage multimap from split key to Regions that start with the |
| split key.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>coverage multimap</dd> |
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| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/util/TreeSet.html?is-external=true" title="class or interface in java.util">TreeSet</a><byte[]> <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RegionSplitCalculator.html#line.159">getSplits</a>()</pre> |
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| <pre>public org.apache.hbase.thirdparty.com.google.common.collect.Multimap<byte[],<a href="../../../../../org/apache/hadoop/hbase/util/RegionSplitCalculator.html" title="type parameter in RegionSplitCalculator">R</a>> <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RegionSplitCalculator.html#line.163">getStarts</a>()</pre> |
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| <h4>findBigRanges</h4> |
| <pre>public static <R extends <a href="../../../../../org/apache/hadoop/hbase/util/KeyRange.html" title="interface in org.apache.hadoop.hbase.util">KeyRange</a>> <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><R> <a href="../../../../../src-html/org/apache/hadoop/hbase/util/RegionSplitCalculator.html#line.179">findBigRanges</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util">Collection</a><R> bigOverlap, |
| int count)</pre> |
| <div class="block">Find specified number of top ranges in a big overlap group. |
| It could return less if there are not that many top ranges. |
| Once these top ranges are excluded, the big overlap group will |
| be broken into ranges with no overlapping, or smaller overlapped |
| groups, and most likely some holes.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>bigOverlap</code> - a list of ranges that overlap with each other</dd> |
| <dd><code>count</code> - the max number of ranges to find</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a list of ranges that overlap with most others</dd> |
| </dl> |
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