Package org.rocksdb

Class BloomFilter

  • All Implemented Interfaces:
    java.lang.AutoCloseable
    public class BloomFilter
extends Filter
    Bloom filter policy that uses a bloom filter with approximately the specified number of bits per key.

    Note: if you are using a custom comparator that ignores some parts of the keys being compared, you must not use this BloomFilter and must provide your own FilterPolicy that also ignores the corresponding parts of the keys. For example, if the comparator ignores trailing spaces, it would be incorrect to use a FilterPolicy (like BloomFilter) that does not ignore trailing spaces in keys.

    • Constructor Detail

      • BloomFilter

        public BloomFilter()
        BloomFilter constructor

        Callers must delete the result after any database that is using the result has been closed.

      • BloomFilter

        public BloomFilter​(double bitsPerKey)
        BloomFilter constructor

        bits_per_key: bits per key in bloom filter. A good value for bits_per_key is 9.9, which yields a filter with ~ 1% false positive rate.

        Callers must delete the result after any database that is using the result has been closed.

        Parameters:
        bitsPerKey - number of bits to use

      • BloomFilter

        public BloomFilter​(double bitsPerKey,
                   boolean useBlockBasedMode)
        BloomFilter constructor

        bits_per_key: bits per key in bloom filter. A good value for bits_per_key is 10, which yields a filter with ~ 1% false positive rate.

        default bits_per_key: 10

        use_block_based_builder: use block based filter rather than full filter. If you want to builder full filter, it needs to be set to false.

        default mode: block based filter

        Callers must delete the result after any database that is using the result has been closed.

        Parameters:
        bitsPerKey - number of bits to use
        useBlockBasedMode - use block based mode or full filter mode