HBase Filter 過濾器之FamilyFilter詳解

前言：本文詳細介紹了 HBase FamilyFilter 過濾器 Java&Shell API 的使用，並貼出了相關示例代碼以供參考。FamilyFilter 基於列族進行過濾，在工做中涉及到須要經過HBase 列族進行數據過濾時能夠考慮使用它。比較器細節及原理請參照以前的更文：HBase Filter 過濾器之比較器 Comparator 原理及源碼學習

一。Java Api

頭部代碼

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); // 造數據
        }
        Table table = connection.getTable(TableName.valueOf(tableName));
        Scan scan = new Scan();

中部代碼
向右滑動滾動條可查看輸出結果。

1. BinaryComparator 構造過濾器

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 構造過濾器

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 構造過濾器

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 構造過濾器

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]

尾部代碼

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 構造過濾器

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

支持的比較運算符：= != > >= < <=，再也不一一舉例。

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

支持的比較運算符：LESS、LESS_OR_EQUAL、EQUAL、NOT_EQUAL、GREATER、GREATER_OR_EQUAL，再也不一一舉例。

推薦使用方式一，更簡潔方便。

2. BinaryPrefixComparator 構造過濾器

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 構造過濾器

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

區別於上的是這裏直接傳入字符串進行比較，且只支持EQUAL和NOT_EQUAL兩種比較符。

4. RegexStringComparator 構造過濾器

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

該比較器直接傳入字符串進行比較，且只支持EQUAL和NOT_EQUAL兩種比較符。若想使用第一種方式能夠傳入regexstring試一下，個人版本有點低暫時不支持，再也不演示了。

注意這裏的正則匹配指包含關係，對應底層find()方法。

FamilyFilter 不支持使用LongComparator比較器，且BitComparator、NullComparator 比較器用之甚少，也再也不介紹。

查看文章所有源代碼請訪如下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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