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我有一个名为User的表，有两列，一个名为visitorId，另一个名为friend，它是一个字符串列表。我想检查VisitorId是否在好友列表中。任何人都可以指导我如何访问地图功能中的表格列？ 我无法了解如何从hbase中的地图功能输出数据。 我的代码如下：Hbase Map/reduce - 如何访问表中的各个列？
ublic class MapReduce {
static class Mapper1 extends TableMapper<ImmutableBytesWritable, Text> {
private int numRecords = 0;
private static final IntWritable one = new IntWritable(1);
private final IntWritable ONE = new IntWritable(1);
private Text text = new Text();
@Override
public void map(ImmutableBytesWritable row, Result values, Context context) throws IOException {
//What should i do here??
ImmutableBytesWritable userKey = new ImmutableBytesWritable(row.get(), 0, Bytes.SIZEOF_INT);
context.write(userkey,One);
}
//context.write(text, ONE);
} catch (InterruptedException e) {
throw new IOException(e);
}
}
}
public static void main(String[] args) throws Exception {
Configuration conf = HBaseConfiguration.create();
Job job = new Job(conf, "CheckVisitor");
job.setJarByClass(MapReduce.class);
Scan scan = new Scan();
Filter f = new RowFilter(CompareOp.EQUAL,new SubstringComparator("mId2"));
scan.setFilter(f);
scan.addFamily(Bytes.toBytes("visitor"));
scan.addFamily(Bytes.toBytes("friend"));
TableMapReduceUtil.initTableMapperJob("User", scan, Mapper1.class, ImmutableBytesWritable.class,Text.class, job);
}
}