Parse error can be caused due to NUL character included in records with Sqoop

Sqoopを使ってRDBMとHadoop間でデータ転送を行なっている。Sqoopは、MapReduceジョブを実行し複数のMapタスクで並列にインポートやエクスポートを行なう。また、Sqoopはコマンドラインからsqoopコマンドを実行するだけで、データ転送に必要なテーブルのメタ情報の取得やRDBMとHadoop間でデータのやり取りをするインターフェースプログラムの生成やコンパイル、各Mapタスクへのデータスプリット計算などを内部で行ってくれるので、実行も非常に容易である。コマンドラインオプションも豊富に用意されており、多くの場合はそれらの組み合わせで十分対応できる。

1 Parse Error with Export
2 テスト環境
3 Sqoop Process Overview
4 Generated Sqoop ORM Class
5 Export処理でのエラーを探る
- 5.1 入力データ
- 5.2 レコードのparse
6 不正文字を含むレコードのParseErrorへの対処
- 6.1 ORMクラス内で文字列置換
- 6.2 enclosingChar、escapeCharの変更
7 参考リンク

Parse Error with Export

で、今回通常どおりSqoopを使ってデータ転送処理を実行していたところ、Sqoop Exportの実行時に以下のようなエラーになってしまった（以下のエラーはローカルで再現させたもの）。成功したMapタスクのデータは転送に成功しているが、失敗したMapタスクのデータは完全に転送されないためデータが不完全な状態になってしまう。parseに失敗しているデータを調べたところ、対象レコードにNUL(\00）文字が含まれていたようだった。そこで、Sqoopの内部動作を追いながら回避方法を模索してみた。

16/07/17 23:17:52 ERROR mapreduce.TextExportMapper: 
16/07/17 23:17:52 ERROR mapreduce.TextExportMapper: Exception raised during data export
16/07/17 23:17:52 ERROR mapreduce.TextExportMapper: 
16/07/17 23:17:52 ERROR mapreduce.TextExportMapper: Exception: 
java.lang.RuntimeException: Can't parse input data: '0'
at employee.__loadFromFields(employee.java:335)
at employee.parse(employee.java:268)
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:83)
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:39)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:140)
at org.apache.sqoop.mapreduce.AutoProgressMapper.run(AutoProgressMapper.java:64)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:672)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:330)
at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:268)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.util.NoSuchElementException
at java.util.ArrayList$Itr.next(ArrayList.java:854)
at employee.__loadFromFields(employee.java:330)
... 13 more

16/07/17 23:17:52 ERROR mapreduce.TextExportMapper:

16/07/17 23:17:52 ERROR mapreduce.TextExportMapper: Exception raised during data export

16/07/17 23:17:52 ERROR mapreduce.TextExportMapper:

16/07/17 23:17:52 ERROR mapreduce.TextExportMapper: Exception:

java.lang.RuntimeException: Can't parse input data: '0'

at employee.__loadFromFields(employee.java:335)

at employee.parse(employee.java:268)

at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:83)

at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:39)

at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:140)

at org.apache.sqoop.mapreduce.AutoProgressMapper.run(AutoProgressMapper.java:64)

at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:672)

at org.apache.hadoop.mapred.MapTask.run(MapTask.java:330)

at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:268)

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)

at java.util.concurrent.FutureTask.run(FutureTask.java:266)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at java.lang.Thread.run(Thread.java:745)

Caused by: java.util.NoSuchElementException

at java.util.ArrayList$Itr.next(ArrayList.java:854)

at employee.__loadFromFields(employee.java:330)

... 13 more

テスト環境

今回の動作テストの環境は以下の通り。

sqoop-1.4.5-cdh5.3.3
ローカル環境

Sqoop Process Overview

まず、Sqoopの実行プロセス概要は以下のようになっている。RDBMSとHDFS間のデータ転送はMapReduceジョブで（Mapタスク）並列実行される。Mapタスクの数などはオプションで調整することができる。

Generated Sqoop ORM Class

Sqoopは、実行時にデータ転送のためのORMクラスを生成する。Sqoop Exportを実行してMySQLへデータ転送する例を挙げ、どのようなORMクラスが生成されるのかを見てみる。

まずは、以下のようなテーブルをMySQLに準備する。

create table employee (
id int primary key,
name text,
group_id int,
sex tinyint
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

create table employee (

id int primary key,

name text,

group_id int,

sex tinyint

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

続いてexportコマンドでORMクラスの生成及びexport処理を実行してみる。今回は、ローカル環境でコマンドラインでなくIDE上でJavaから直接Sqoopクラスをコールする形で実行した。

package sample;
import org.apache.sqoop.Sqoop;
public class SqoopExportTest {
public static void main(String[] args) {
exportToMySQL("sample", "employee");
}
static void exportToMySQL(String database, String table) {
System.out.println("=> exportToMySQL");
String[] args = new String[] {
"export",
"--connect", "jdbc:mysql://localhost/" + database,
"--username", "sqoop",
"--password", "sqoop",
"--export-dir", "input",
"--input-null-string", "\\\\N",
"--input-null-non-string", "\\\\N",
"--table", table,
"--input-fields-terminated-by", "\001",
"--bindir", "output",
"--outdir", "output"
};
Sqoop.main(args);
}
}

package sample;

import org.apache.sqoop.Sqoop;

public class SqoopExportTest {

public static void main(String[] args) {

exportToMySQL("sample", "employee");

}

static void exportToMySQL(String database, String table) {

System.out.println("=> exportToMySQL");

String[] args = new String[] {

"export",

"--connect", "jdbc:mysql://localhost/" + database,

"--username", "sqoop",

"--password", "sqoop",

"--export-dir", "input",

"--input-null-string", "\\\\N",

"--input-null-non-string", "\\\\N",

"--table", table,

"--input-fields-terminated-by", "\001",

"--bindir", "output",

"--outdir", "output"

};

Sqoop.main(args);

}

実行するとoutputディレクトリに以下のファイルが生成される。

$ tree output/
output/
├── employee.class
├── employee.jar
└── employee.java
0 directories, 3 files

$ tree output/

output/

├── employee.class

├── employee.jar

└── employee.java

0 directories, 3 files

employee.javaがORMクラスになり中身は以下のとおり。

// ORM class for table 'employee'
// WARNING: This class is AUTO-GENERATED. Modify at your own risk.
//
// Debug information:
// Generated date: Sun Jul 17 12:28:31 JST 2016
// For connector: org.apache.sqoop.manager.MySQLManager
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapred.lib.db.DBWritable;
import com.cloudera.sqoop.lib.JdbcWritableBridge;
import com.cloudera.sqoop.lib.DelimiterSet;
import com.cloudera.sqoop.lib.FieldFormatter;
import com.cloudera.sqoop.lib.RecordParser;
import com.cloudera.sqoop.lib.BooleanParser;
import com.cloudera.sqoop.lib.BlobRef;
import com.cloudera.sqoop.lib.ClobRef;
import com.cloudera.sqoop.lib.LargeObjectLoader;
import com.cloudera.sqoop.lib.SqoopRecord;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.sql.Date;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
public class employee extends SqoopRecord  implements DBWritable, Writable {
private final int PROTOCOL_VERSION = 3;
public int getClassFormatVersion() { return PROTOCOL_VERSION; }
protected ResultSet __cur_result_set;
private Integer id;
public Integer get_id() {
return id;
}
public void set_id(Integer id) {
this.id = id;
}
public employee with_id(Integer id) {
this.id = id;
return this;
}
private String name;
public String get_name() {
return name;
}
public void set_name(String name) {
this.name = name;
}
public employee with_name(String name) {
this.name = name;
return this;
}
private Integer group_id;
public Integer get_group_id() {
return group_id;
}
public void set_group_id(Integer group_id) {
this.group_id = group_id;
}
public employee with_group_id(Integer group_id) {
this.group_id = group_id;
return this;
}
private Integer sex;
public Integer get_sex() {
return sex;
}
public void set_sex(Integer sex) {
this.sex = sex;
}
public employee with_sex(Integer sex) {
this.sex = sex;
return this;
}
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof employee)) {
return false;
}
employee that = (employee) o;
boolean equal = true;
equal = equal && (this.id == null ? that.id == null : this.id.equals(that.id));
equal = equal && (this.name == null ? that.name == null : this.name.equals(that.name));
equal = equal && (this.group_id == null ? that.group_id == null : this.group_id.equals(that.group_id));
equal = equal && (this.sex == null ? that.sex == null : this.sex.equals(that.sex));
return equal;
}
public boolean equals0(Object o) {
if (this == o) {
return true;
}
if (!(o instanceof employee)) {
return false;
}
employee that = (employee) o;
boolean equal = true;
equal = equal && (this.id == null ? that.id == null : this.id.equals(that.id));
equal = equal && (this.name == null ? that.name == null : this.name.equals(that.name));
equal = equal && (this.group_id == null ? that.group_id == null : this.group_id.equals(that.group_id));
equal = equal && (this.sex == null ? that.sex == null : this.sex.equals(that.sex));
return equal;
}
public void readFields(ResultSet __dbResults) throws SQLException {
this.__cur_result_set = __dbResults;
this.id = JdbcWritableBridge.readInteger(1, __dbResults);
this.name = JdbcWritableBridge.readString(2, __dbResults);
this.group_id = JdbcWritableBridge.readInteger(3, __dbResults);
this.sex = JdbcWritableBridge.readInteger(4, __dbResults);
}
public void readFields0(ResultSet __dbResults) throws SQLException {
this.id = JdbcWritableBridge.readInteger(1, __dbResults);
this.name = JdbcWritableBridge.readString(2, __dbResults);
this.group_id = JdbcWritableBridge.readInteger(3, __dbResults);
this.sex = JdbcWritableBridge.readInteger(4, __dbResults);
}
public void loadLargeObjects(LargeObjectLoader __loader)
throws SQLException, IOException, InterruptedException {
}
public void loadLargeObjects0(LargeObjectLoader __loader)
throws SQLException, IOException, InterruptedException {
}
public void write(PreparedStatement __dbStmt) throws SQLException {
write(__dbStmt, 0);
}
public int write(PreparedStatement __dbStmt, int __off) throws SQLException {
JdbcWritableBridge.writeInteger(id, 1 + __off, 4, __dbStmt);
JdbcWritableBridge.writeString(name, 2 + __off, -1, __dbStmt);
JdbcWritableBridge.writeInteger(group_id, 3 + __off, 4, __dbStmt);
JdbcWritableBridge.writeInteger(sex, 4 + __off, -6, __dbStmt);
return 4;
}
public void write0(PreparedStatement __dbStmt, int __off) throws SQLException {
JdbcWritableBridge.writeInteger(id, 1 + __off, 4, __dbStmt);
JdbcWritableBridge.writeString(name, 2 + __off, -1, __dbStmt);
JdbcWritableBridge.writeInteger(group_id, 3 + __off, 4, __dbStmt);
JdbcWritableBridge.writeInteger(sex, 4 + __off, -6, __dbStmt);
}
public void readFields(DataInput __dataIn) throws IOException {
this.readFields0(__dataIn);  }
public void readFields0(DataInput __dataIn) throws IOException {
if (__dataIn.readBoolean()) { 
this.id = null;
} else {
this.id = Integer.valueOf(__dataIn.readInt());
}
if (__dataIn.readBoolean()) { 
this.name = null;
} else {
this.name = Text.readString(__dataIn);
}
if (__dataIn.readBoolean()) { 
this.group_id = null;
} else {
this.group_id = Integer.valueOf(__dataIn.readInt());
}
if (__dataIn.readBoolean()) { 
this.sex = null;
} else {
this.sex = Integer.valueOf(__dataIn.readInt());
}
}
public void write(DataOutput __dataOut) throws IOException {
if (null == this.id) { 
__dataOut.writeBoolean(true);
} else {
__dataOut.writeBoolean(false);
__dataOut.writeInt(this.id);
}
if (null == this.name) { 
__dataOut.writeBoolean(true);
} else {
__dataOut.writeBoolean(false);
Text.writeString(__dataOut, name);
}
if (null == this.group_id) { 
__dataOut.writeBoolean(true);
} else {
__dataOut.writeBoolean(false);
__dataOut.writeInt(this.group_id);
}
if (null == this.sex) { 
__dataOut.writeBoolean(true);
} else {
__dataOut.writeBoolean(false);
__dataOut.writeInt(this.sex);
}
}
public void write0(DataOutput __dataOut) throws IOException {
if (null == this.id) { 
__dataOut.writeBoolean(true);
} else {
__dataOut.writeBoolean(false);
__dataOut.writeInt(this.id);
}
if (null == this.name) { 
__dataOut.writeBoolean(true);
} else {
__dataOut.writeBoolean(false);
Text.writeString(__dataOut, name);
}
if (null == this.group_id) { 
__dataOut.writeBoolean(true);
} else {
__dataOut.writeBoolean(false);
__dataOut.writeInt(this.group_id);
}
if (null == this.sex) { 
__dataOut.writeBoolean(true);
} else {
__dataOut.writeBoolean(false);
__dataOut.writeInt(this.sex);
}
}
private static final DelimiterSet __outputDelimiters = new DelimiterSet((char) 44, (char) 10, (char) 0, (char) 0, false);
public String toString() {
return toString(__outputDelimiters, true);
}
public String toString(DelimiterSet delimiters) {
return toString(delimiters, true);
}
public String toString(boolean useRecordDelim) {
return toString(__outputDelimiters, useRecordDelim);
}
public String toString(DelimiterSet delimiters, boolean useRecordDelim) {
StringBuilder __sb = new StringBuilder();
char fieldDelim = delimiters.getFieldsTerminatedBy();
__sb.append(FieldFormatter.escapeAndEnclose(id==null?"null":"" + id, delimiters));
__sb.append(fieldDelim);
__sb.append(FieldFormatter.escapeAndEnclose(name==null?"null":name, delimiters));
__sb.append(fieldDelim);
__sb.append(FieldFormatter.escapeAndEnclose(group_id==null?"null":"" + group_id, delimiters));
__sb.append(fieldDelim);
__sb.append(FieldFormatter.escapeAndEnclose(sex==null?"null":"" + sex, delimiters));
if (useRecordDelim) {
__sb.append(delimiters.getLinesTerminatedBy());
}
return __sb.toString();
}
public void toString0(DelimiterSet delimiters, StringBuilder __sb, char fieldDelim) {
__sb.append(FieldFormatter.escapeAndEnclose(id==null?"null":"" + id, delimiters));
__sb.append(fieldDelim);
__sb.append(FieldFormatter.escapeAndEnclose(name==null?"null":name, delimiters));
__sb.append(fieldDelim);
__sb.append(FieldFormatter.escapeAndEnclose(group_id==null?"null":"" + group_id, delimiters));
__sb.append(fieldDelim);
__sb.append(FieldFormatter.escapeAndEnclose(sex==null?"null":"" + sex, delimiters));
}
private static final DelimiterSet __inputDelimiters = new DelimiterSet((char) 1, (char) 10, (char) 0, (char) 0, false);
private RecordParser __parser;
public void parse(Text __record) throws RecordParser.ParseError {
if (null == this.__parser) {
this.__parser = new RecordParser(__inputDelimiters);
}
List<String> __fields = this.__parser.parseRecord(__record);
__loadFromFields(__fields);
}
public void parse(CharSequence __record) throws RecordParser.ParseError {
if (null == this.__parser) {
this.__parser = new RecordParser(__inputDelimiters);
}
List<String> __fields = this.__parser.parseRecord(__record);
__loadFromFields(__fields);
}
public void parse(byte [] __record) throws RecordParser.ParseError {
if (null == this.__parser) {
this.__parser = new RecordParser(__inputDelimiters);
}
List<String> __fields = this.__parser.parseRecord(__record);
__loadFromFields(__fields);
}
public void parse(char [] __record) throws RecordParser.ParseError {
if (null == this.__parser) {
this.__parser = new RecordParser(__inputDelimiters);
}
List<String> __fields = this.__parser.parseRecord(__record);
__loadFromFields(__fields);
}
public void parse(ByteBuffer __record) throws RecordParser.ParseError {
if (null == this.__parser) {
this.__parser = new RecordParser(__inputDelimiters);
}
List<String> __fields = this.__parser.parseRecord(__record);
__loadFromFields(__fields);
}
public void parse(CharBuffer __record) throws RecordParser.ParseError {
if (null == this.__parser) {
this.__parser = new RecordParser(__inputDelimiters);
}
List<String> __fields = this.__parser.parseRecord(__record);
__loadFromFields(__fields);
}
private void __loadFromFields(List<String> fields) {
Iterator<String> __it = fields.listIterator();
String __cur_str = null;
try {
__cur_str = __it.next();
if (__cur_str.equals("\\N") || __cur_str.length() == 0) { this.id = null; } else {
this.id = Integer.valueOf(__cur_str);
}
__cur_str = __it.next();
if (__cur_str.equals("\\N")) { this.name = null; } else {
this.name = __cur_str;
}
__cur_str = __it.next();
if (__cur_str.equals("\\N") || __cur_str.length() == 0) { this.group_id = null; } else {
this.group_id = Integer.valueOf(__cur_str);
}
__cur_str = __it.next();
if (__cur_str.equals("\\N") || __cur_str.length() == 0) { this.sex = null; } else {
this.sex = Integer.valueOf(__cur_str);
}
} catch (RuntimeException e) {    throw new RuntimeException("Can't parse input data: '" + __cur_str + "'", e);    }  }
private void __loadFromFields0(Iterator<String> __it) {
String __cur_str = null;
try {
__cur_str = __it.next();
if (__cur_str.equals("\\N") || __cur_str.length() == 0) { this.id = null; } else {
this.id = Integer.valueOf(__cur_str);
}
__cur_str = __it.next();
if (__cur_str.equals("\\N")) { this.name = null; } else {
this.name = __cur_str;
}
__cur_str = __it.next();
if (__cur_str.equals("\\N") || __cur_str.length() == 0) { this.group_id = null; } else {
this.group_id = Integer.valueOf(__cur_str);
}
__cur_str = __it.next();
if (__cur_str.equals("\\N") || __cur_str.length() == 0) { this.sex = null; } else {
this.sex = Integer.valueOf(__cur_str);
}
} catch (RuntimeException e) {    throw new RuntimeException("Can't parse input data: '" + __cur_str + "'", e);    }  }
public Object clone() throws CloneNotSupportedException {
employee o = (employee) super.clone();
return o;
}
public void clone0(employee o) throws CloneNotSupportedException {
}
public Map<String, Object> getFieldMap() {
Map<String, Object> __sqoop$field_map = new TreeMap<String, Object>();
__sqoop$field_map.put("id", this.id);
__sqoop$field_map.put("name", this.name);
__sqoop$field_map.put("group_id", this.group_id);
__sqoop$field_map.put("sex", this.sex);
return __sqoop$field_map;
}
public void getFieldMap0(Map<String, Object> __sqoop$field_map) {
__sqoop$field_map.put("id", this.id);
__sqoop$field_map.put("name", this.name);
__sqoop$field_map.put("group_id", this.group_id);
__sqoop$field_map.put("sex", this.sex);
}
public void setField(String __fieldName, Object __fieldVal) {
if ("id".equals(__fieldName)) {
this.id = (Integer) __fieldVal;
}
else    if ("name".equals(__fieldName)) {
this.name = (String) __fieldVal;
}
else    if ("group_id".equals(__fieldName)) {
this.group_id = (Integer) __fieldVal;
}
else    if ("sex".equals(__fieldName)) {
this.sex = (Integer) __fieldVal;
}
else {
throw new RuntimeException("No such field: " + __fieldName);
}
}
public boolean setField0(String __fieldName, Object __fieldVal) {
if ("id".equals(__fieldName)) {
this.id = (Integer) __fieldVal;
return true;
}
else    if ("name".equals(__fieldName)) {
this.name = (String) __fieldVal;
return true;
}
else    if ("group_id".equals(__fieldName)) {
this.group_id = (Integer) __fieldVal;
return true;
}
else    if ("sex".equals(__fieldName)) {
this.sex = (Integer) __fieldVal;
return true;
}
else {
return false;    }
}
}

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// ORM class for table 'employee'

// WARNING: This class is AUTO-GENERATED. Modify at your own risk.

// Debug information:

// Generated date: Sun Jul 17 12:28:31 JST 2016

// For connector: org.apache.sqoop.manager.MySQLManager

import org.apache.hadoop.io.BytesWritable;

import org.apache.hadoop.io.Text;

import org.apache.hadoop.io.Writable;

import org.apache.hadoop.mapred.lib.db.DBWritable;

import com.cloudera.sqoop.lib.JdbcWritableBridge;

import com.cloudera.sqoop.lib.DelimiterSet;

import com.cloudera.sqoop.lib.FieldFormatter;

import com.cloudera.sqoop.lib.RecordParser;

import com.cloudera.sqoop.lib.BooleanParser;

import com.cloudera.sqoop.lib.BlobRef;

import com.cloudera.sqoop.lib.ClobRef;

import com.cloudera.sqoop.lib.LargeObjectLoader;

import com.cloudera.sqoop.lib.SqoopRecord;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.io.DataInput;

import java.io.DataOutput;

import java.io.IOException;

import java.nio.ByteBuffer;

import java.nio.CharBuffer;

import java.sql.Date;

import java.sql.Time;

import java.sql.Timestamp;

import java.util.Arrays;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.TreeMap;

public class employee extends SqoopRecord implements DBWritable, Writable {

private final int PROTOCOL_VERSION = 3;

public int getClassFormatVersion() { return PROTOCOL_VERSION; }

protected ResultSet __cur_result_set;

private Integer id;

public Integer get_id() {

return id;

}

public void set_id(Integer id) {

this.id = id;

}

public employee with_id(Integer id) {

this.id = id;

return this;

}

private String name;

public String get_name() {

return name;

}

public void set_name(String name) {

this.name = name;

}

public employee with_name(String name) {

this.name = name;

return this;

}

private Integer group_id;

public Integer get_group_id() {

return group_id;

}

public void set_group_id(Integer group_id) {

this.group_id = group_id;

}

public employee with_group_id(Integer group_id) {

this.group_id = group_id;

return this;

}

private Integer sex;

public Integer get_sex() {

return sex;

}

public void set_sex(Integer sex) {

this.sex = sex;

}

public employee with_sex(Integer sex) {

this.sex = sex;

return this;

}

public boolean equals(Object o) {

if (this == o) {

return true;

}

if (!(o instanceof employee)) {

return false;

}

employee that = (employee) o;

boolean equal = true;

equal = equal && (this.id == null ? that.id == null : this.id.equals(that.id));

equal = equal && (this.name == null ? that.name == null : this.name.equals(that.name));

equal = equal && (this.group_id == null ? that.group_id == null : this.group_id.equals(that.group_id));

equal = equal && (this.sex == null ? that.sex == null : this.sex.equals(that.sex));

return equal;

}

public boolean equals0(Object o) {

if (this == o) {

return true;

}

if (!(o instanceof employee)) {

return false;

}

employee that = (employee) o;

boolean equal = true;

equal = equal && (this.id == null ? that.id == null : this.id.equals(that.id));

equal = equal && (this.name == null ? that.name == null : this.name.equals(that.name));

equal = equal && (this.group_id == null ? that.group_id == null : this.group_id.equals(that.group_id));

equal = equal && (this.sex == null ? that.sex == null : this.sex.equals(that.sex));

return equal;

}

public void readFields(ResultSet __dbResults) throws SQLException {

this.__cur_result_set = __dbResults;

this.id = JdbcWritableBridge.readInteger(1, __dbResults);

this.name = JdbcWritableBridge.readString(2, __dbResults);

this.group_id = JdbcWritableBridge.readInteger(3, __dbResults);

this.sex = JdbcWritableBridge.readInteger(4, __dbResults);

}

public void readFields0(ResultSet __dbResults) throws SQLException {

this.id = JdbcWritableBridge.readInteger(1, __dbResults);

this.name = JdbcWritableBridge.readString(2, __dbResults);

this.group_id = JdbcWritableBridge.readInteger(3, __dbResults);

this.sex = JdbcWritableBridge.readInteger(4, __dbResults);

}

public void loadLargeObjects(LargeObjectLoader __loader)

throws SQLException, IOException, InterruptedException {

}

public void loadLargeObjects0(LargeObjectLoader __loader)

throws SQLException, IOException, InterruptedException {

}

public void write(PreparedStatement __dbStmt) throws SQLException {

write(__dbStmt, 0);

}

public int write(PreparedStatement __dbStmt, int __off) throws SQLException {

JdbcWritableBridge.writeInteger(id, 1 + __off, 4, __dbStmt);

JdbcWritableBridge.writeString(name, 2 + __off, -1, __dbStmt);

JdbcWritableBridge.writeInteger(group_id, 3 + __off, 4, __dbStmt);

JdbcWritableBridge.writeInteger(sex, 4 + __off, -6, __dbStmt);

return 4;

}

public void write0(PreparedStatement __dbStmt, int __off) throws SQLException {

JdbcWritableBridge.writeInteger(id, 1 + __off, 4, __dbStmt);

JdbcWritableBridge.writeString(name, 2 + __off, -1, __dbStmt);

JdbcWritableBridge.writeInteger(group_id, 3 + __off, 4, __dbStmt);

JdbcWritableBridge.writeInteger(sex, 4 + __off, -6, __dbStmt);

}

public void readFields(DataInput __dataIn) throws IOException {

this.readFields0(__dataIn); }

public void readFields0(DataInput __dataIn) throws IOException {

if (__dataIn.readBoolean()) {

this.id = null;

} else {

this.id = Integer.valueOf(__dataIn.readInt());

}

if (__dataIn.readBoolean()) {

this.name = null;

} else {

this.name = Text.readString(__dataIn);

}

if (__dataIn.readBoolean()) {

this.group_id = null;

} else {

this.group_id = Integer.valueOf(__dataIn.readInt());

}

if (__dataIn.readBoolean()) {

this.sex = null;

} else {

this.sex = Integer.valueOf(__dataIn.readInt());

}

public void write(DataOutput __dataOut) throws IOException {

if (null == this.id) {

__dataOut.writeBoolean(true);

} else {

__dataOut.writeBoolean(false);

__dataOut.writeInt(this.id);

}

if (null == this.name) {

__dataOut.writeBoolean(true);

} else {

__dataOut.writeBoolean(false);

Text.writeString(__dataOut, name);

}

if (null == this.group_id) {

__dataOut.writeBoolean(true);

} else {

__dataOut.writeBoolean(false);

__dataOut.writeInt(this.group_id);

}

if (null == this.sex) {

__dataOut.writeBoolean(true);

} else {

__dataOut.writeBoolean(false);

__dataOut.writeInt(this.sex);

}

public void write0(DataOutput __dataOut) throws IOException {

if (null == this.id) {

__dataOut.writeBoolean(true);

} else {

__dataOut.writeBoolean(false);

__dataOut.writeInt(this.id);

}

if (null == this.name) {

__dataOut.writeBoolean(true);

} else {

__dataOut.writeBoolean(false);

Text.writeString(__dataOut, name);

}

if (null == this.group_id) {

__dataOut.writeBoolean(true);

} else {

__dataOut.writeBoolean(false);

__dataOut.writeInt(this.group_id);

}

if (null == this.sex) {

__dataOut.writeBoolean(true);

} else {

__dataOut.writeBoolean(false);

__dataOut.writeInt(this.sex);

}

private static final DelimiterSet __outputDelimiters = new DelimiterSet((char) 44, (char) 10, (char) 0, (char) 0, false);

public String toString() {

return toString(__outputDelimiters, true);

}

public String toString(DelimiterSet delimiters) {

return toString(delimiters, true);

}

public String toString(boolean useRecordDelim) {

return toString(__outputDelimiters, useRecordDelim);

}

public String toString(DelimiterSet delimiters, boolean useRecordDelim) {

StringBuilder __sb = new StringBuilder();

char fieldDelim = delimiters.getFieldsTerminatedBy();

__sb.append(FieldFormatter.escapeAndEnclose(id==null?"null":"" + id, delimiters));

__sb.append(fieldDelim);

__sb.append(FieldFormatter.escapeAndEnclose(name==null?"null":name, delimiters));

__sb.append(fieldDelim);

__sb.append(FieldFormatter.escapeAndEnclose(group_id==null?"null":"" + group_id, delimiters));

__sb.append(fieldDelim);

__sb.append(FieldFormatter.escapeAndEnclose(sex==null?"null":"" + sex, delimiters));

if (useRecordDelim) {

__sb.append(delimiters.getLinesTerminatedBy());

}

return __sb.toString();

}

public void toString0(DelimiterSet delimiters, StringBuilder __sb, char fieldDelim) {

__sb.append(FieldFormatter.escapeAndEnclose(id==null?"null":"" + id, delimiters));

__sb.append(fieldDelim);

__sb.append(FieldFormatter.escapeAndEnclose(name==null?"null":name, delimiters));

__sb.append(fieldDelim);

__sb.append(FieldFormatter.escapeAndEnclose(group_id==null?"null":"" + group_id, delimiters));

__sb.append(fieldDelim);

__sb.append(FieldFormatter.escapeAndEnclose(sex==null?"null":"" + sex, delimiters));

}

private static final DelimiterSet __inputDelimiters = new DelimiterSet((char) 1, (char) 10, (char) 0, (char) 0, false);

private RecordParser __parser;

public void parse(Text __record) throws RecordParser.ParseError {

if (null == this.__parser) {

this.__parser = new RecordParser(__inputDelimiters);

}

List<String> __fields = this.__parser.parseRecord(__record);

__loadFromFields(__fields);

}

public void parse(CharSequence __record) throws RecordParser.ParseError {

if (null == this.__parser) {

this.__parser = new RecordParser(__inputDelimiters);

}

List<String> __fields = this.__parser.parseRecord(__record);

__loadFromFields(__fields);

}

public void parse(byte [] __record) throws RecordParser.ParseError {

if (null == this.__parser) {

this.__parser = new RecordParser(__inputDelimiters);

}

List<String> __fields = this.__parser.parseRecord(__record);

__loadFromFields(__fields);

}

public void parse(char [] __record) throws RecordParser.ParseError {

if (null == this.__parser) {

this.__parser = new RecordParser(__inputDelimiters);

}

List<String> __fields = this.__parser.parseRecord(__record);

__loadFromFields(__fields);

}

public void parse(ByteBuffer __record) throws RecordParser.ParseError {

if (null == this.__parser) {

this.__parser = new RecordParser(__inputDelimiters);

}

List<String> __fields = this.__parser.parseRecord(__record);

__loadFromFields(__fields);

}

public void parse(CharBuffer __record) throws RecordParser.ParseError {

if (null == this.__parser) {

this.__parser = new RecordParser(__inputDelimiters);

}

List<String> __fields = this.__parser.parseRecord(__record);

__loadFromFields(__fields);

}

private void __loadFromFields(List<String> fields) {

Iterator<String> __it = fields.listIterator();

String __cur_str = null;

try {

__cur_str = __it.next();

if (__cur_str.equals("\\N") || __cur_str.length() == 0) { this.id = null; } else {

this.id = Integer.valueOf(__cur_str);

}

__cur_str = __it.next();

if (__cur_str.equals("\\N")) { this.name = null; } else {

this.name = __cur_str;

}

__cur_str = __it.next();

if (__cur_str.equals("\\N") || __cur_str.length() == 0) { this.group_id = null; } else {

this.group_id = Integer.valueOf(__cur_str);

}

__cur_str = __it.next();

if (__cur_str.equals("\\N") || __cur_str.length() == 0) { this.sex = null; } else {

this.sex = Integer.valueOf(__cur_str);

}

} catch (RuntimeException e) { throw new RuntimeException("Can't parse input data: '" + __cur_str + "'", e); } }

private void __loadFromFields0(Iterator<String> __it) {

String __cur_str = null;

try {

__cur_str = __it.next();

if (__cur_str.equals("\\N") || __cur_str.length() == 0) { this.id = null; } else {

this.id = Integer.valueOf(__cur_str);

}

__cur_str = __it.next();

if (__cur_str.equals("\\N")) { this.name = null; } else {

this.name = __cur_str;

}

__cur_str = __it.next();

if (__cur_str.equals("\\N") || __cur_str.length() == 0) { this.group_id = null; } else {

this.group_id = Integer.valueOf(__cur_str);

}

__cur_str = __it.next();

if (__cur_str.equals("\\N") || __cur_str.length() == 0) { this.sex = null; } else {

this.sex = Integer.valueOf(__cur_str);

}

} catch (RuntimeException e) { throw new RuntimeException("Can't parse input data: '" + __cur_str + "'", e); } }

public Object clone() throws CloneNotSupportedException {

employee o = (employee) super.clone();

return o;

}

public void clone0(employee o) throws CloneNotSupportedException {

}

public Map<String, Object> getFieldMap() {

Map<String, Object> __sqoop$field_map = new TreeMap<String, Object>();

__sqoop$field_map.put("id", this.id);

__sqoop$field_map.put("name", this.name);

__sqoop$field_map.put("group_id", this.group_id);

__sqoop$field_map.put("sex", this.sex);

return __sqoop$field_map;

}

public void getFieldMap0(Map<String, Object> __sqoop$field_map) {

__sqoop$field_map.put("id", this.id);

__sqoop$field_map.put("name", this.name);

__sqoop$field_map.put("group_id", this.group_id);

__sqoop$field_map.put("sex", this.sex);

}

public void setField(String __fieldName, Object __fieldVal) {

if ("id".equals(__fieldName)) {

this.id = (Integer) __fieldVal;

}

else if ("name".equals(__fieldName)) {

this.name = (String) __fieldVal;

}

else if ("group_id".equals(__fieldName)) {

this.group_id = (Integer) __fieldVal;

}

else if ("sex".equals(__fieldName)) {

this.sex = (Integer) __fieldVal;

}

else {

throw new RuntimeException("No such field: " + __fieldName);

}

public boolean setField0(String __fieldName, Object __fieldVal) {

if ("id".equals(__fieldName)) {

this.id = (Integer) __fieldVal;

return true;

}

else if ("name".equals(__fieldName)) {

this.name = (String) __fieldVal;

return true;

}

else if ("group_id".equals(__fieldName)) {

this.group_id = (Integer) __fieldVal;

return true;

}

else if ("sex".equals(__fieldName)) {

this.sex = (Integer) __fieldVal;

return true;

}

else {

return false; }

}

Export処理でのエラーを探る

今回エラーとなったNUL文字を含むデータとして以下のようなサンプルデータを用意した。^Aや^@は制御コードを示している。

入力データ

1^Ahaikikyou^A100^A0
2^A^@^A200^A1
3^A\N^A300^A1
4^Adeife^A400^A1
5^Adffife^A800^A1

1^Ahaikikyou^A100^A0

2^A^@^A200^A1

3^A\N^A300^A1

4^Adeife^A400^A1

5^Adffife^A800^A1

レコードのparse

ソースの中でExceptionがスローされたのは以下の箇所。ソース中のコメントにも書いているが、レコードを行単位で処理していく（入力データは標準的なテキストファイルを想定）際にレコードをparseしてフィールドのリストとして返すところで、メソッドから返されたリストの要素数がテーブルメタ情報から取得したカラム数と一致していないことでエラーとなっていたもよう。__loadFromFieldsメソッドでIteratorを使って要素にアクセスするが、リストのフィールド数がカラム数より小さいため、リストの終端を超えた要素アクセスが発生しjava.util.NoSuchElementExceptionがスローされている。

...
// 入力レコードに関する区切り文字などの指定
private static final DelimiterSet __inputDelimiters = new DelimiterSet((char) 1, (char) 10, (char) 0, (char) 0, false);
private RecordParser __parser;
public void parse(Text __record) throws RecordParser.ParseError {
if (null == this.__parser) {
this.__parser = new RecordParser(__inputDelimiters);
}
// RecordParserにより各フィールドごとに分割されたリストが返されるが
// NUL文字が含まれる場合、parseRecordで戻されるフィールド数がテーブル情報と
// 一致していない
List<String> __fields = this.__parser.parseRecord(__record);
// 各種フィールドをemployeeインスタンスメンバにリストアする
__loadFromFields(__fields);
}
...

...

// 入力レコードに関する区切り文字などの指定

private static final DelimiterSet __inputDelimiters = new DelimiterSet((char) 1, (char) 10, (char) 0, (char) 0, false);

private RecordParser __parser;

public void parse(Text __record) throws RecordParser.ParseError {

if (null == this.__parser) {

this.__parser = new RecordParser(__inputDelimiters);

}

// RecordParserにより各フィールドごとに分割されたリストが返されるが

// NUL文字が含まれる場合、parseRecordで戻されるフィールド数がテーブル情報と

// 一致していない

List<String> __fields = this.__parser.parseRecord(__record);

// 各種フィールドをemployeeインスタンスメンバにリストアする

__loadFromFields(__fields);

}

...

さらに、RecordParser#parseRecordを追ってみる。parseRecordはステートマシンで実装されており、行レコードをパースしてフィールドのリストに分解する。以下は、メソッドの処理を簡略化したものになる。

...
public List<String> parseRecord(CharBuffer input) {
...
char enclosingChar = delimiters.getEnclosedBy();
char fieldDelim = delimiters.getFieldsTerminatedBy();
char recordDelim = delimiters.getLinesTerminatedBy();
char escapeChar = delimiters.getEscapedBy();
boolean enclosingRequired = delimiters.isEncloseRequired();
for (int pos = 0; pos < len; pos++) {
curChar = input.get();
switch (state) {
case FIELD_START:
// ready to start processing a new field.
if (null != sb) {
// We finished processing a previous field. Add to the list.
outputs.add(sb.toString());
}
sb = new StringBuilder();
if (enclosingChar == curChar) {
// got an opening encloser.
state = ParseState.ENCLOSED_FIELD;
} else if (escapeChar == curChar) {
state = ParseState.UNENCLOSED_ESCAPE;
} else if (fieldDelim == curChar) {
// we have a zero-length field. This is a no-op.
continue;
} else if (recordDelim == curChar) {
// we have a zero-length field, that ends processing.
pos = len;
} else {
// current char is part of the field.
state = ParseState.UNENCLOSED_FIELD;
sb.append(curChar);
if (enclosingRequired) {
throw new com.cloudera.sqoop.lib.RecordParser.ParseError(
"Opening field-encloser expected at position " + pos);
}
}
break;
case ENCLOSED_FIELD:
...
break;
case UNENCLOSED_FIELD:
...
break;
case ENCLOSED_ESCAPE:
...
break;
case ENCLOSED_EXPECT_DELIMITER:
...
break;
case UNENCLOSED_ESCAPE:
...
break;
default:
throw new com.cloudera.sqoop.lib.RecordParser.ParseError(
"Unexpected parser state: " + state);
}
}
...
}

...

public List<String> parseRecord(CharBuffer input) {

...

char enclosingChar = delimiters.getEnclosedBy();

char fieldDelim = delimiters.getFieldsTerminatedBy();

char recordDelim = delimiters.getLinesTerminatedBy();

char escapeChar = delimiters.getEscapedBy();

boolean enclosingRequired = delimiters.isEncloseRequired();

for (int pos = 0; pos < len; pos++) {

curChar = input.get();

switch (state) {

case FIELD_START:

// ready to start processing a new field.

if (null != sb) {

// We finished processing a previous field. Add to the list.

outputs.add(sb.toString());

}

sb = new StringBuilder();

if (enclosingChar == curChar) {

// got an opening encloser.

state = ParseState.ENCLOSED_FIELD;

} else if (escapeChar == curChar) {

state = ParseState.UNENCLOSED_ESCAPE;

} else if (fieldDelim == curChar) {

// we have a zero-length field. This is a no-op.

continue;

} else if (recordDelim == curChar) {

// we have a zero-length field, that ends processing.

pos = len;

} else {

// current char is part of the field.

state = ParseState.UNENCLOSED_FIELD;

sb.append(curChar);

if (enclosingRequired) {

throw new com.cloudera.sqoop.lib.RecordParser.ParseError(

"Opening field-encloser expected at position " + pos);

}

break;

case ENCLOSED_FIELD:

...

break;

case UNENCLOSED_FIELD:

...

break;

case ENCLOSED_ESCAPE:

...

break;

case ENCLOSED_EXPECT_DELIMITER:

...

break;

case UNENCLOSED_ESCAPE:

...

break;

default:

throw new com.cloudera.sqoop.lib.RecordParser.ParseError(

"Unexpected parser state: " + state);

}

...

}

上記のステートマシンの状態遷移図を書くと以下のようになるだろうか。

Start
X
+
fieldDelim |            fieldDelim       recordDelim
+-+   |  +---------------------+      +--+
| |   |  |                     |      |  |
+v-+---v--v-+               +---+------+--v--+
+----------->FIELD_START+--------------->UNENCLOSED_FIELD+------+
|           +^-+--+--+--+               +-----^----+--^--+      |
|            | |  |  |                        |    |  |         |
|            +-+  |  |                        |    +--+         |
|    recordDelim  |  |                        |                 |escapeChar
|                 |  |                        +--------------+  |
|                 |  |                                       |  |
|    enclosingChar|  |               escapeChar              |  |
|                 |  +------------------------------------+  |  |
|          +----+ |                                       |  |  |
|          |    | |                                       |  |  |
|          |  +-+-v----------+                         +--v--+--v--------+
|          +-->ENCLOSED_FIELD<------------+            |UNENCLOSED_ESCAPE|
|             +---+--+-------+            |            +-----------------+
|                 |  |                    |
|fieldDelim       |  |                    |
|                 |  |                    |
|                 |  |  escapeChar    +---+-----------+
|                 |  +---------------->ENCLOSED_ESCAPE|
|                 |                   +---------------+
|                 |enclosingChar
|                 |
|             +---v---------------------+        +-+
+-------------+ENCLOSED_EXPECT_DELIMITER+-------->X|throw ParseError
+-----------------^--+----+        +-+
|  |
+--+
recordDelim

Start

fieldDelim | fieldDelim recordDelim

+-+ | +---------------------+ +--+

| | | | | | |

+v-+---v--v-+ +---+------+--v--+

+----------->FIELD_START+--------------->UNENCLOSED_FIELD+------+

| +^-+--+--+--+ +-----^----+--^--+ |

| | | | | | | | |

| +-+ | | | +--+ |

| | | +--------------+ |

| | | | |

| | +------------------------------------+ | |

| +----+ | | | |

| | | | | | |

| | +-+-v----------+ +--v--+--v--------+

| +-->ENCLOSED_FIELD<------------+ |UNENCLOSED_ESCAPE|

| +---+--+-------+ | +-----------------+

| | | |

|fieldDelim | | |

| | | |

| | | escapeChar +---+-----------+

| | +---------------->ENCLOSED_ESCAPE|

| | +---------------+

| |enclosingChar

| |

| +---v---------------------+ +-+

+-------------+ENCLOSED_EXPECT_DELIMITER+-------->X|throw ParseError

+-----------------^--+----+ +-+

| |

+--+

recordDelim

この状態遷移図をもとに、今回ParseErrorとなったレコードの遷移を見てみる。

INPUT RECORD
2^A^@^A200^A1
-------------------------------------------------
(2) ^A
+----------------------+
|                      |
+-------v---+ (1) 2     +------+---------+
|FIELD_START+----------->UNENCLOSED_FIELD|
+-------+---+           +----------------+
|
(3) ^@ |
|
|  +--------------+
+-->ENCLOSED_FIELD|
+-----+--^-----+
|  |
+--+
(4)...

INPUT RECORD

2^A^@^A200^A1

-------------------------------------------------

(2) ^A

+----------------------+

| |

+-------v---+ (1) 2 +------+---------+

|FIELD_START+----------->UNENCLOSED_FIELD|

+-------+---+ +----------------+

(3) ^@ |

| +--------------+

+-->ENCLOSED_FIELD|

+-----+--^-----+

| |

+--+

(4)...

NUL文字はenclosingCharのデフォルト値として使われているため、今回のようにレコードにNUL文字が含まれていた場合、本来FILED_START -> UNENCLOSED_FIELDと遷移することを期待していたが、FIELD_STARTの状態時にENCLOSED_FIELDに遷移する入力（enclosingCharトークン）が出現したため期待と異なる状態へ遷移してしまっていた。この結果、最終的にListとして返されたデータは以下のようになっていた。

Expected -----
fields[0] = 2
fields[1] = ^@
fields[2] = 200
fields[3] = 1
UnExpected -----
fields[0] = 2
fields[1] = ^A200^A1

Expected -----

fields[0] = 2

fields[1] = ^@

fields[2] = 200

fields[3] = 1

UnExpected -----

fields[0] = 2

fields[1] = ^A200^A1

不正文字を含むレコードのParseErrorへの対処

ORMクラス内で文字列置換

なかなか難儀だが、自動生成されたORMクラス内でparseRecordされる前に置換する方法。修正したソースを事前にコンパイルして、exportやimportコマンド実行時に--jar-fileオプションで渡してやる。

public void parse(Text __record) throws RecordParser.ParseError {
if (null == this.__parser) {
this.__parser = new RecordParser(__inputDelimiters);
}
// replace invalid characters with '?'. 
// 不正文字の置換
__record = new Text(__record.toString().replaceAll("\001", "?"));
List<String> __fields = this.__parser.parseRecord(__record);
__loadFromFields(__fields);
}

public void parse(Text __record) throws RecordParser.ParseError {

if (null == this.__parser) {

this.__parser = new RecordParser(__inputDelimiters);

}

// replace invalid characters with '?'.

// 不正文字の置換

__record = new Text(__record.toString().replaceAll("\001", "?"));

List<String> __fields = this.__parser.parseRecord(__record);

__loadFromFields(__fields);

}

enclosingChar、escapeCharの変更

もう１つは、極力sqoopの範囲で対応してあげる方法があるだろうか。デフォルトではNUL文字となっているenclosingCharやescapeCharを処理上影響のない文字に変更する。Exportの場合は、--input-escaped-by、--input-optionally-enclosed-byで指定できる。例えば以下のようになる。

package sample;
import org.apache.sqoop.Sqoop;
public class SqoopExportTest {
public static void main(String[] args) {
exportToMySQL("sample", "employee");
}
static void exportToMySQL(String database, String table) {
System.out.println("=> exportToMySQL");
String[] args = new String[] {
"export",
"--connect", "jdbc:mysql://localhost/" + database,
"--username", "sqoop",
"--password", "sqoop",
"--export-dir", "input",
"--input-null-string", "\\\\N",
"--input-null-non-string", "\\\\N",
"--table", table,
"--input-fields-terminated-by", "\001",
"--bindir", "output/bin",
"--outdir", "output",
"--input-escaped-by", "\032",
"--input-optionally-enclosed-by", "\032",
"--verbose"
};
Sqoop.main(args);
}
}

package sample;

import org.apache.sqoop.Sqoop;

public class SqoopExportTest {

public static void main(String[] args) {

exportToMySQL("sample", "employee");

}

static void exportToMySQL(String database, String table) {

System.out.println("=> exportToMySQL");

String[] args = new String[] {

"export",

"--connect", "jdbc:mysql://localhost/" + database,

"--username", "sqoop",

"--password", "sqoop",

"--export-dir", "input",

"--input-null-string", "\\\\N",

"--input-null-non-string", "\\\\N",

"--table", table,

"--input-fields-terminated-by", "\001",

"--bindir", "output/bin",

"--outdir", "output",

"--input-escaped-by", "\032",

"--input-optionally-enclosed-by", "\032",

"--verbose"

};

Sqoop.main(args);

}

実行するとmysqlには以下のようにデータが入っていることが確認できた。

mysql> select * from employee;
+----+-----------+----------+------+
| id | name      | group_id | sex  |
+----+-----------+----------+------+
|  1 | haikikyou |      100 |    0 |
|  2 |           |      200 |    1 |
|  3 | NULL      |      300 |    1 |
|  4 | deife     |      400 |    1 |
|  5 | dffife    |      800 |    1 |
+----+-----------+----------+------+
5 rows in set (0.00 sec)

mysql> select * from employee;

+----+-----------+----------+------+

| id | name | group_id | sex |

+----+-----------+----------+------+

| 1 | haikikyou | 100 | 0 |

| 2 | | 200 | 1 |

| 3 | NULL | 300 | 1 |

| 4 | deife | 400 | 1 |

| 5 | dffife | 800 | 1 |

+----+-----------+----------+------+

5 rows in set (0.00 sec)

例えば、RDBMSからHDFSへ--hive-drop-import-delimsオプション付きでhiveインポートして、さらに別のサービスで同テーブルデータを使いたくexportするような場合には、--hive-drop-import-delimsでドロップされた文字を--input-escaped-byなどのオプションに渡してあげれば、export時にドロップされた文字が出現しないことが保証されるだろう。

RDBMS ----------------> HDFS --------------> RDMBS
import with                   export with
--hive-drop-import-delims      --input-escaped-by "\n"
--input-optionally-enclosed-by "\n"