如何使用hbase行键过滤器RowFilter
RowFilter是用来对rowkey进行过滤的,比较符如下:
Operator | Description |
LESS | 小于 |
LESS_OR_EQUAL | 小于等于 |
EQUAL | 等于 |
NOT_EQUAL | 不等于 |
GREATER_OR_EQUAL | 大于等于 |
GREATER | 大于 |
NO_OP | 排除所有 |
Comparator | Description |
BinaryComparator | 使用Bytes.compareTo()比较 |
BinaryPrefixComparator | 和BinaryComparator差不多,从前面开始比较 |
NullComparator | Does not compare against an actual value but whether a given one is null, or not null. |
BitComparator | Performs a bitwise comparison, providing a BitwiseOp class with AND, OR, and XOR operators. |
RegexStringComparator | 正则表达式 |
SubstringComparator | 把数据当成字符串,用contains()来判断 |
提取rowkey以01结尾数据
Filter filter = new RowFilter(CompareFilter.CompareOp.EQUAL,new RegexStringComparator(“.*01$”));
提取rowkey以包含201407的数据
Filter filter = new RowFilter(CompareFilter.CompareOp.EQUAL,new SubstringComparator(“201407”));
提取rowkey以123开头的数据
Filter filter = new RowFilter(CompareFilter.CompareOp.EQUAL,new BinaryPrefixComparator(“123”.getBytes()));