[HBASE-2220] Add a binary comparator that only compares up to the length of the supplied byte array

• Type: New Feature
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 0.20.4, 0.90.0
• Component/s: Filters
• Hadoop Flags: Reviewed
• Assignee: Unassigned
• Reporter: Bruno Dumon
• Created: 12/Feb/10 10:10
• Updated: 12/Oct/12 06:15
• Resolved: 12/Feb/10 20:15

Description

This new comparator is similar to the existing BinaryComparator, but only compares up to the length of the supplied byte array.

The use-case I need this for is secondary indexes. I build a table where the row keys have the form

{value}{row key}, where {value}

is a fixed length byte array. On this index table I then would like to perform range scans on just the fixed length

{value}

part. The BinaryPrefixComparator supplied in this patch enables exactly this, when used in combination with the RowFilter.

See also mail at
http://mail-archives.apache.org/mod_mbox/hadoop-hbase-user/201002.mbox/[e-mail]%3E