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From "Jim Kellerman (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-1757) [hbase] Bloomfilters: single argument constructor, use enum for bloom filter types
Date Wed, 22 Aug 2007 17:32:30 GMT
[hbase] Bloomfilters: single argument constructor, use enum for bloom filter types
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                 Key: HADOOP-1757
                 URL: https://issues.apache.org/jira/browse/HADOOP-1757
             Project: Hadoop
          Issue Type: Improvement
          Components: contrib/hbase
    Affects Versions: 0.15.0
            Reporter: Jim Kellerman
            Assignee: Jim Kellerman
            Priority: Minor
             Fix For: 0.15.0


On Thu, 2007-08-23 at 01:46 +0900, Inchul Song wrote:
Hi all,
> 
> When I create a column for an Hbase table, I have to create
> an instance of the HColumnDescriptor class, and
> pass over an instance of the BloomFilterDescriptor class
> describing which bloom filter to use to the constructor
> of the HColumnDescriptor class.
> 
> But there is some inconvenience in using the BloomFilterDescriptor class:
> 
> 1. Non-existence of a single argument constructor
> 
> When creating an instance of the BloomFilterDescriptor class,
> I need to specify some options for the newly created bloom filter.
> There are three options: type, vectorSize, nbHash.
> I know that these options are important for
> the internal working of a bloom filter, but I cannot help
> but confess that I don't really understand
> what vectorSize and hbHash mean and how these two options
> affect the way in which a bloom filter works.
> As the user of a bloom filter, the only thing I am concerned with is
> the first option, the name of the bloom filter that I'd like to
> use for the column, and it would be nice if the other options
> are automatically decided and filled in.
> 
> So it would be nice if there is a constructor
> with a single 'type' argument in the BloomFilterDescriptor class.
> 
> 2. Bloom filter types are defined as integers
> 
> Bloom filter types are not in an enumeration class.
> Thus, when filling in the type option of the constructor
> from a String value, I always have to write some translation
> code from the string value to one of the integer values
> representing bloom filter types.
> 
> If there is an enumeration class containing bloom filter types,
> I can utilize the valueOf method of the enumeration class
> to do this tedious job.
> 
> Thanks,
> 
> Song

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