[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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