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java.lang.Objectorg.apache.cassandra.dht.RandomPartitioner
public class RandomPartitioner
This class generates a BigIntegerToken using MD5 hash.
Field Summary | |
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static BigIntegerToken |
MINIMUM
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static java.math.BigInteger |
TWO
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Constructor Summary | |
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RandomPartitioner()
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Method Summary | |
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DecoratedKey<BigIntegerToken> |
convertFromDiskFormat(java.lang.String key)
Convert the on disk representation to a DecoratedKey object |
java.lang.String |
convertToDiskFormat(DecoratedKey<BigIntegerToken> key)
Convert the DecoratedKey to the on disk format used for this partitioner. |
DecoratedKey<BigIntegerToken> |
decorateKey(java.lang.String key)
Transform key to object representation of the on-disk format. |
BigIntegerToken |
getMinimumToken()
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BigIntegerToken |
getRandomToken()
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BigIntegerToken |
getToken(java.lang.String key)
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Token.TokenFactory<java.math.BigInteger> |
getTokenFactory()
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BigIntegerToken |
midpoint(BigIntegerToken ltoken,
BigIntegerToken rtoken)
Calculate a Token representing the approximate "middle" of the given range. |
boolean |
preservesOrder()
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Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final java.math.BigInteger TWO
public static final BigIntegerToken MINIMUM
Constructor Detail |
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public RandomPartitioner()
Method Detail |
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public DecoratedKey<BigIntegerToken> decorateKey(java.lang.String key)
IPartitioner
decorateKey
in interface IPartitioner<BigIntegerToken>
key
- the raw, client-facing key
public DecoratedKey<BigIntegerToken> convertFromDiskFormat(java.lang.String key)
IPartitioner
convertFromDiskFormat
in interface IPartitioner<BigIntegerToken>
key
- On disk representation
public java.lang.String convertToDiskFormat(DecoratedKey<BigIntegerToken> key)
IPartitioner
convertToDiskFormat
in interface IPartitioner<BigIntegerToken>
key
- The DecoratedKey in question
public BigIntegerToken midpoint(BigIntegerToken ltoken, BigIntegerToken rtoken)
IPartitioner
midpoint
in interface IPartitioner<BigIntegerToken>
public BigIntegerToken getMinimumToken()
getMinimumToken
in interface IPartitioner<BigIntegerToken>
public BigIntegerToken getRandomToken()
getRandomToken
in interface IPartitioner<BigIntegerToken>
public Token.TokenFactory<java.math.BigInteger> getTokenFactory()
getTokenFactory
in interface IPartitioner<BigIntegerToken>
public boolean preservesOrder()
preservesOrder
in interface IPartitioner<BigIntegerToken>
public BigIntegerToken getToken(java.lang.String key)
getToken
in interface IPartitioner<BigIntegerToken>
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