HBase Filter 过滤器之FamilyFilter详解
2020-05-17 本文已影响0人
步闲
前言：本文详细介绍了 HBase FamilyFilter 过滤器 Java&Shell API 的使用，并贴出了相关示例代码以供参考。FamilyFilter 基于列族进行过滤，在工作中涉及到需要通过HBase 列族进行数据过滤时可以考虑使用它。比较器细节及原理请参照之前的更文：HBase Filter 过滤器之比较器 Comparator 原理及源码学习
一。Java Api
头部代码
public class FamilyFilterDemo {
private static boolean isok = false;
private static String tableName = "test";
private static String[] cfs = new String[]{"f1","f2"};
private static String[] data = new String[]{"row-1:f1:c1:v1", "row-2:f1:c2:v2", "row-3:f2:c3:v3", "row-4:f2:c4:v4"};
public static void main(String[] args) throws IOException {
MyBase myBase = new MyBase();
Connection connection = myBase.createConnection();
if (isok) {
myBase.deleteTable(connection, tableName);
myBase.createTable(connection, tableName, cfs);
myBase.putRows(connection, tableName, data); // 造数据
}
Table table = connection.getTable(TableName.valueOf(tableName));
Scan scan = new Scan();
中部代码
向右滑动滚动条可查看输出结果。
1. BinaryComparator 构造过滤器
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.EQUAL, new BinaryComparator(Bytes.toBytes("f1"))); // [row-1, row-2]
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.NOT_EQUAL, new BinaryComparator(Bytes.toBytes("f1"))); // [row-3, row-4]
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.GREATER, new BinaryComparator(Bytes.toBytes("f1"))); // [row-3, row-4]
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.GREATER_OR_EQUAL, new BinaryComparator(Bytes.toBytes("f1"))); // [row-1, row-2, row-3, row-4]
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.LESS, new BinaryComparator(Bytes.toBytes("f2"))); // [row-1, row-2]
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.LESS_OR_EQUAL, new BinaryComparator(Bytes.toBytes("f1"))); // [row-1, row-2]
2. BinaryPrefixComparator 构造过滤器
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.EQUAL, new BinaryComparator(Bytes.toBytes("f1"))); // [row-1, row-2]
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.NOT_EQUAL, new BinaryComparator(Bytes.toBytes("f1"))); // [row-3, row-4]
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.GREATER, new BinaryComparator(Bytes.toBytes("f1"))); // [row-3, row-4]
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.GREATER_OR_EQUAL, new BinaryComparator(Bytes.toBytes("f1"))); // [row-1, row-2, row-3, row-4]
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.LESS, new BinaryComparator(Bytes.toBytes("f2"))); // [row-1, row-2]
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.LESS_OR_EQUAL, new BinaryComparator(Bytes.toBytes("f1"))); // [row-1, row-2]
3. SubstringComparator 构造过滤器
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.EQUAL, new SubstringComparator("1")); // [row-1, row-2]
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.NOT_EQUAL, new SubstringComparator("f")); // []
4. RegexStringComparator 构造过滤器
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.NOT_EQUAL, new RegexStringComparator("f")); // []
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.EQUAL, new RegexStringComparator("f")); // [row-1, row-2, row-3, row-4]
FamilyFilter familyFilter = new FamilyFilter(CompareFilter.CompareOp.EQUAL, new RegexStringComparator("2")); // [row-3, row-4]
尾部代码
scan.setFilter(familyFilter);
ResultScanner scanner = table.getScanner(scan);
Iterator<Result> iterator = scanner.iterator();
LinkedList<String> rowkeys = new LinkedList<>();
while (iterator.hasNext()) {
Result result = iterator.next();
String rowkey = Bytes.toString(result.getRow());
rowkeys.add(rowkey);
}
System.out.println(rowkeys);
scanner.close();
table.close();
connection.close();
}
}
二。Shell Api
1. BinaryComparator 构造过滤器
方式一：
hbase(main):002:0> scan 'test',{FILTER=>"FamilyFilter(=,'binary:f1')"}
ROW COLUMN+CELL
row-1 column=f1:c1, timestamp=1588834369334, value=v1
row-2 column=f1:c2, timestamp=1588834369334, value=v2
2 row(s) in 0.1000 seconds
支持的比较运算符：= != > >= < <=，不再一一举例。
方式二：
import org.apache.hadoop.hbase.filter.CompareFilter
import org.apache.hadoop.hbase.filter.BinaryComparator
import org.apache.hadoop.hbase.filter.FamilyFilter
hbase(main):006:0> scan 'test',{FILTER => FamilyFilter.new(CompareFilter::CompareOp.valueOf('EQUAL'), BinaryComparator.new(Bytes.toBytes('f1')))}
ROW COLUMN+CELL
row-1 column=f1:c1, timestamp=1588834369334, value=v1
row-2 column=f1:c2, timestamp=1588834369334, value=v2
2 row(s) in 0.0350 seconds
支持的比较运算符：LESS、LESS_OR_EQUAL、EQUAL、NOT_EQUAL、GREATER、GREATER_OR_EQUAL，不再一一举例。
推荐使用方式一，更简洁方便。
2. BinaryPrefixComparator 构造过滤器
方式一：
hbase(main):007:0> scan 'test',{FILTER=>"FamilyFilter(=,'binaryprefix:f1')"}
ROW COLUMN+CELL
row-1 column=f1:c1, timestamp=1588834369334, value=v1
row-2 column=f1:c2, timestamp=1588834369334, value=v2
2 row(s) in 0.0600 seconds
方式二：
import org.apache.hadoop.hbase.filter.CompareFilter
import org.apache.hadoop.hbase.filter.BinaryPrefixComparator
import org.apache.hadoop.hbase.filter.FamilyFilter
hbase(main):011:0> scan 'test',{FILTER => FamilyFilter.new(CompareFilter::CompareOp.valueOf('EQUAL'), BinaryPrefixComparator.new(Bytes.toBytes('f1')))}
ROW COLUMN+CELL
row-1 column=f1:c1, timestamp=1588834369334, value=v1
row-2 column=f1:c2, timestamp=1588834369334, value=v2
2 row(s) in 0.0290 seconds
其它同上。
3. SubstringComparator 构造过滤器
方式一：
hbase(main):012:0> scan 'test',{FILTER=>"FamilyFilter(=,'substring:f1')"}
ROW COLUMN+CELL
row-1 column=f1:c1, timestamp=1588834369334, value=v1
row-2 column=f1:c2, timestamp=1588834369334, value=v2
2 row(s) in 0.0400 seconds
方式二：
import org.apache.hadoop.hbase.filter.CompareFilter
import org.apache.hadoop.hbase.filter.SubstringComparator
import org.apache.hadoop.hbase.filter.FamilyFilter
hbase(main):016:0> scan 'test',{FILTER => FamilyFilter.new(CompareFilter::CompareOp.valueOf('EQUAL'), SubstringComparator.new('f1'))}
ROW COLUMN+CELL
row-1 column=f1:c1, timestamp=1588834369334, value=v1
row-2 column=f1:c2, timestamp=1588834369334, value=v2
2 row(s) in 0.0330 seconds
区别于上的是这里直接传入字符串进行比较，且只支持EQUAL和NOT_EQUAL两种比较符。
4. RegexStringComparator 构造过滤器
import org.apache.hadoop.hbase.filter.CompareFilter
import org.apache.hadoop.hbase.filter.RegexStringComparator
import org.apache.hadoop.hbase.filter.FamilyFilter
hbase(main):018:0> scan 'test',{FILTER => FamilyFilter.new(CompareFilter::CompareOp.valueOf('EQUAL'), RegexStringComparator.new('f'))}
ROW COLUMN+CELL
row-1 column=f1:c1, timestamp=1588834369334, value=v1
row-2 column=f1:c2, timestamp=1588834369334, value=v2
row-3 column=f2:c3, timestamp=1588834369334, value=v3
row-4 column=f2:c4, timestamp=1588834369334, value=v4
4 row(s) in 0.0600 seconds
该比较器直接传入字符串进行比较，且只支持EQUAL和NOT_EQUAL两种比较符。若想使用第一种方式可以传入regexstring试一下，我的版本有点低暂时不支持，不再演示了。
注意这里的正则匹配指包含关系，对应底层find()方法。
FamilyFilter 不支持使用LongComparator比较器，且BitComparator、NullComparator 比较器用之甚少，也不再介绍。
查看文章全部源代码请访以下GitHub地址：
https://github.com/zhoupengbo/demos-bigdata/blob/master/hbase/hbase-filters-demos/src/main/java/com/zpb/demos/FamilyFilterDemo.java
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