HBase
  1. HBase
  2. HBASE-19

CountingBloomFilter can overflow its storage

    Details

    • Type: Bug Bug
    • Status: Closed
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 0.2.0
    • Component/s: None
    • Labels:
      None

      Description

      The org.onelab.filter.CountingBloomFilter implementation does not check the value of a bucket before incrementing/decrementing it. The buckets in a Counting Bloom filter must not be allowed to overflow, and if they reach their maximum value, they must not be allowed to decrement. This is the only way to preserve the assumptions of the filter (without larger buckets). See: http://en.wikipedia.org/wiki/Bloom_filter#Counting_filters

      Currently, if enough values hash to a bucket, the CountingBloomFilter may begin reporting false negatives when it wraps back around to 0.

      1. 19-v2.patch
        7 kB
        Bryan Duxbury
      2. 19.patch
        7 kB
        Bryan Duxbury
      3. counting-overflow-fourbit.patch
        7 kB
        Stu Hood
      4. counting-overflow-fourbit.patch
        7 kB
        Stu Hood
      5. counting-overflow.patch
        0.9 kB
        Stu Hood

        Activity

          People

          • Assignee:
            Unassigned
            Reporter:
            Stu Hood
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            Dates

            • Created:
              Updated:
              Resolved:

              Development