Class: Humboldt::BinaryPrefixPartitioner
- Inherits:
-
Object
- Object
- Humboldt::BinaryPrefixPartitioner
- Defined in:
- lib/humboldt/prefix_grouping.rb
Direct Known Subclasses
Instance Method Summary collapse
-
#initialize(cutoff_index) ⇒ BinaryPrefixPartitioner
constructor
A new instance of BinaryPrefixPartitioner.
- #partition(key, value, num_partitions) ⇒ Object
Constructor Details
#initialize(cutoff_index) ⇒ BinaryPrefixPartitioner
Returns a new instance of BinaryPrefixPartitioner.
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# File 'lib/humboldt/prefix_grouping.rb', line 8 def initialize(cutoff_index) @cutoff_index = cutoff_index end |
Instance Method Details
#partition(key, value, num_partitions) ⇒ Object
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# File 'lib/humboldt/prefix_grouping.rb', line 12 def partition(key, value, num_partitions) length = @cutoff_index > key.length ? key.length : @cutoff_index prefix = String.from_java_bytes(key.bytes)[0, length] Zlib.crc32(prefix) % num_partitions end |