我编写了一个 mapreduce 程序,它使用 HCATLOG 从 hive 表中读取数据并写入 HBase。这是一个只有地图的工作,没有减速器。我已经从命令行运行了该程序,它按预期工作(创建了一个胖 jar 以避免 Jar 问题)。我想将它集成到 oozie(在 HUE 的帮助下)。我有两个选择来运行它
- 使用 Mapreduce 操作
- 使用 Java 动作
由于我的 Mapreduce 程序有一个包含以下代码的驱动程序方法
import org.apache.hadoop.conf.*;
import org.apache.hadoop.io.*;
import org.apache.hadoop.mapreduce.*;
import org.apache.hadoop.util.*;
import org.apache.hadoop.fs.*;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hive.hcatalog.data.schema.HCatSchema;
import org.apache.hive.hcatalog.mapreduce.HCatInputFormat;
import org.apache.hive.hcatalog.mapreduce.HCatOutputFormat;
public class HBaseValdiateInsertDriver {
public static void main(String[] args) throws Exception {
String dbName = "Test";
String tableName = "emp";
Configuration conf = new Configuration();
args = new GenericOptionsParser(conf, args).getRemainingArgs();
Job job = new Job(conf, "HBase Get Put Demo");
job.setInputFormatClass(HCatInputFormat.class);
HCatInputFormat.setInput(job, dbName, tableName, null);
job.setJarByClass(HBaseValdiateInsertDriver.class);
job.setMapperClass(HBaseValdiateInsert.class);
job.setMapOutputKeyClass(Text.class);
job.setMapOutputValueClass(Text.class);
job.setNumReduceTasks(0);
FileInputFormat.addInputPath(job, new Path("maprfs:///user/input"));
FileOutputFormat.setOutputPath(job, new Path("maprfs:///user/output"));
job.waitForCompletion(true);
}
}
如何在 oozie 中指定驱动程序方法,我所看到的只是指定映射器和减速器类。有人可以指导我如何设置属性吗?
使用 java 操作,我可以将我的驱动程序类指定为主类并执行它,但我面临诸如找不到表、找不到 HCATLOG jar 等错误。我在工作流程中包含 hive-site.xml(使用 Hue)但我感觉系统无法拾取属性。有人可以告诉我我需要注意什么吗,还有其他我需要包含的配置属性吗?
我在cloudera网站中提到的示例程序也使用
HCatInputFormat.setInput(job, InputJobInfo.create(dbName,
inputTableName, null));
当我使用以下内容时(我没有看到接受上述输入的方法
HCatInputFormat.setInput(job, dbName, tableName, null);
下面是我的映射器代码
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.client.Durability;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.HTableInterface;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hive.hcatalog.data.HCatRecord;
public class HBaseValdiateInsert extends Mapper<WritableComparable, HCatRecord, Text, Text> {
static HTableInterface table;
static HTableInterface inserted;
private String hbaseDate = null;
String existigValue=null;
List<Put> putList = new ArrayList<Put>();
@Override
public void setup(Context context) throws IOException {
Configuration conf = context.getConfiguration();
String tablename = "dev_arch186";
Utils.getHBConnection();
table = Utils.getTable(tablename);
table.setAutoFlushTo(false);
}
@Override
public void cleanup(Context context) {
try {
table.put(putList);
table.flushCommits();
table.close();
} catch (IOException e) {
e.printStackTrace();
}
Utils.closeConnection();
}
@Override
public void map(WritableComparable key, HCatRecord value, Context context) throws IOException, InterruptedException {
String name_hive = (String) value.get(0);
String id_hive = (String) value.get(1);
String rec[] = test.toString().split(",");
Get g = new Get(Bytes.toBytes(name_hive));
existigValue=getOneRecord(Bytes.toBytes("Info"),Bytes.toBytes("name"),name_hive);
if (existigValue.equalsIgnoreCase("NA") || !existigValue.equalsIgnoreCase(id_hive)) {
Put put = new Put(Bytes.toBytes(rec[0]));
put.add(Bytes.toBytes("Info"),
Bytes.toBytes("name"),
Bytes.toBytes(rec[1]));
put.setDurability(Durability.SKIP_WAL);
putList.add(put);
if(putList.size()>25000){
table.put(putList);
table.flushCommits();
}
}
}
public String getOneRecord(byte[] columnFamily, byte[] columnQualifier, String rowKey)
throws IOException {
Get get = new Get(rowKey.getBytes());
get.setMaxVersions(1);
Result rs = table.get(get);
rs.getColumn(columnFamily, columnQualifier);
System.out.println(rs.containsColumn(columnFamily, columnQualifier));
KeyValue result = rs.getColumnLatest(columnFamily,columnQualifier);
if (rs.containsColumn(columnFamily, columnQualifier))
return (Bytes.toString(result.getValue()));
else
return "NA";
}
public boolean columnQualifierExists(String tableName, String ColumnFamily,
String ColumnQualifier, String rowKey) throws IOException {
Get get = new Get(rowKey.getBytes());
Result rs = table.get(get);
return(rs.containsColumn(ColumnFamily.getBytes(),ColumnQualifier.getBytes()));
}
}
注意:我使用带有 HUE 的 MapR (M3) Cluster 作为 oozie 的接口。Hive 版本:1-0 HCAT 版本:1-0