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生产背景：
在从mysql导入到hive中,遇到如下问题：
1） 源mysql和集群机器不在同一个网段中，导致执行导入命令，网络连接失败。
2） 某些字符导入到hive中，出现报错终止。
2.1 sqoop使用的JDBC-connector 版本太低（更换版本）。
从hive导出到mysql中，遇到如下问题：
1）某些字符插入mysql，出现报错终止。
1.1 可能mysql本身编码的限制，某些字符不支持，比如uft8和utf8mb4
1.2 sqoop使用的JDBC-connector 版本太低（更换版本）。
sqoop 缺点:
1 基于命令行的操作方式，易出错，且不安全。
2 数据传输和数据格式是紧耦合的，这使得connector无法支持所有的数据格式
3 用户名和密码暴漏出来
4 sqoop安装需要root权限
Sqoop优点：
1 高效可控的利用资源，任务并行度，超时时间。
2 数据类型映射与转化，可自动进行，用户也可自定义 .
3 支持多种主流数据库，MySQL,Oracle，SQL Server，DB2等等 。
Sqoop原理：
Sqoop的inport原理：
Sqoop在import时，需要制定split-by参数。Sqoop根据不同的split-by参数值来进行切分,然后将切分出来的区域分配到不同map中。每个map中再处理数据库中获取的一行一行的值，写入到HDFS中。同时split-by根据不同的参数类型有不同的切分方法，如比较简单的int型，Sqoop会取最大和最小split-by字段值，然后根据传入的num-mappers来确定划分几个区域。 比如select max(split_by),min(split-by) from得到的max(split-by)和min(split-by)分别为1000和1，而num-mappers为2的话，则会分成两个区域(1,500)和(501-100),同时也会分成2个sql给2个map去进行导入操作，分别为select XXX from table where split-by>=1 and split-by<500和select XXX from table where split-by>=501 and split-by<=1000。最后每个map各自获取各自SQL中的数据进行导入工作。
Sqoop的export原理：根据mysql表名称，生成一个以表名称命名的Java类，该类继承了sqoopRecord的，是一个只有Map的MR，且自定义了输出字段。
sqoop export --connect jdbc:mysql://$url:3306/$3?characterEncoding=utf8 --username $username --password $password --table $1 --export-dir $2 --input-fields-terminated-by ‘|‘ --null-non-string ‘0‘ --null-string ‘0‘;
验证sqoop的各种报错：
mysql表
create table dm_trlog (
plat varchar(20),
user_id varchar(20),
click_time varchar(20),
click_url varchar(200)
)
hive 表
CREATE TABLE TRLOG
(
PLATFORM string,
USER_ID int,
CLICK_TIME string,
CLICK_URL string
)
row format delimited
fields terminated by ‘\t‘;
sqoop list-databases –connect jdbc:mysql://192.168.119.129:3306/ –username li72 –password 123
1 mysql字段太短
sqoop export --connect jdbc:mysql://192.168.119.129:3306/student?characterEncoding=utf8 --username li72 --password 123 --table dm_trlog --export-dir /home/bigdata/hive/data/db1.db/trlog --input-fields-terminated-by ‘\t‘ --null-non-string ‘0‘ --null-string ‘0‘;
Warning: $HADOOP_HOME is deprecated.
14/11/06 01:42:32 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead.
14/11/06 01:42:32 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset.
14/11/06 01:42:32 INFO tool.CodeGenTool: Beginning code generation
14/11/06 01:42:34 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `dm_trlog` AS t LIMIT 1
14/11/06 01:42:34 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `dm_trlog` AS t LIMIT 1
14/11/06 01:42:34 INFO orm.CompilationManager: HADOOP_MAPRED_HOME is /home/bigdata/hadoop
Note: /tmp/sqoop-root/compile/d5e37c20a9231b3253c97fc27d16d8a9/dm_trlog.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
14/11/06 01:42:38 INFO orm.CompilationManager: Writing jar file: /tmp/sqoop-root/compile/d5e37c20a9231b3253c97fc27d16d8a9/dm_trlog.jar
14/11/06 01:42:38 INFO mapreduce.ExportJobBase: Beginning export of dm_trlog
14/11/06 01:42:43 INFO input.FileInputFormat: Total input paths to process : 1
14/11/06 01:42:43 INFO input.FileInputFormat: Total input paths to process : 1
14/11/06 01:42:43 INFO util.NativeCodeLoader: Loaded the native-hadoop library
14/11/06 01:42:43 WARN snappy.LoadSnappy: Snappy native library not loaded
14/11/06 01:42:44 INFO mapred.JobClient: Running job: job_201411060114_0001
14/11/06 01:42:45 INFO mapred.JobClient: map 0% reduce 0%
14/11/06 01:43:15 INFO mapred.JobClient: Task Id : attempt_201411060114_0001_m_000000_0, Status : FAILED
java.io.IOException: com.mysql.jdbc.MysqlDataTruncation: Data truncation: Data too long for column ‘click_time‘ at row 1
at org.apache.sqoop.mapreduce.AsyncSqlRecordWriter.close(AsyncSqlRecordWriter.java:192)
at org.apache.hadoop.mapred.MapTask$NewDirectOutputCollector.close(MapTask.java:651)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:766)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: com.mysql.jdbc.MysqlDataTruncation: Data truncation: Data too long for column ‘click_time‘ at row 1
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4118)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4052)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2503)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2664)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2794)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1379)
at org.apache.sqoop.mapreduce.AsyncSqlOutputFormat$AsyncSqlExecThread.run(AsyncSqlOutputFormat.java:233)
mysql字段太短了
drop table dm_trlog;
create table dm_trlog (
plat varchar(20),
user_id varchar(20),
click_time varchar(200),
click_url varchar(200)
)
2 hive的空字段转换
由于Hive的NULL用\N来表示，字段用\001来分割，换行用\n来换行，导出分隔符一定要和hive表保持一致，如果为空可以指定转换为0，有些mysql数字字段不能插入\N
加上两个参数：--input-null-string ‘\\N‘ --input-null-non-string ‘\\N‘，多加一个‘\‘，是为转义
sqoop export --connect jdbc:mysql://192.168.119.129:3306/student?characterEncoding=utf8 --username li72 --password 123 --table dm_trlog --export-dir /home/bigdata/hive/data/db1.db/trlog --input-fields-terminated-by ‘\t‘ --null-non-string ‘0‘ --null-string ‘0‘;
14/10/23 04:53:47 INFO orm.CompilationManager: Writing jar file: /tmp/sqoop-hadoop/compile/915d24128af59c9e517580e0f07411d4/dm_pc_play_kpi.jar
14/10/23 04:53:47 INFO mapreduce.ExportJobBase: Beginning export of dm_pc_play_kpi
14/10/23 04:53:48 INFO input.FileInputFormat: Total input paths to process : 1
14/10/23 04:53:48 INFO input.FileInputFormat: Total input paths to process : 1
14/10/23 04:53:48 WARN snappy.LoadSnappy: Snappy native library is available
14/10/23 04:53:48 INFO util.NativeCodeLoader: Loaded the native-hadoop library
14/10/23 04:53:48 INFO snappy.LoadSnappy: Snappy native library loaded
14/10/23 04:53:48 INFO mapred.JobClient: Running job: job_201408301703_84117
14/10/23 04:53:49 INFO mapred.JobClient: map 0% reduce 0%
14/10/23 04:55:45 INFO mapred.JobClient: Task Id : attempt_201408301703_84117_m_000000_0, Status : FAILED
java.io.IOException: Can‘t export data, please check task tracker logs
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:112)
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:39)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
at org.apache.sqoop.mapreduce.AutoProgressMapper.run(AutoProgressMapper.java:64)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.lang.NumberFormatException: For input string: "N"
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1241)
at java.lang.Float.valueOf(Float.java:417)
at dm_pc_play_kpi.__loadFromFields(dm_pc_play_kpi.java:335)
at dm_pc_play_kpi.parse(dm_pc_play_kpi.java:282)
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:83)
... 10 more
14/10/23 04:55:53 INFO mapred.JobClient: Task Id : attempt_201408301703_84117_m_000000_1, Status : FAILED
14/10/23 04:55:58 INFO mapred.JobClient: Task Id : attempt_201408301703_84117_m_000000_2, Status : FAILED
java.io.IOException: Can‘t export data, please check task tracker logs
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:112)
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:39)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
at org.apache.sqoop.mapreduce.AutoProgressMapper.run(AutoProgressMapper.java:64)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.lang.NumberFormatException: For input string: "N"
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1241)
at java.lang.Float.valueOf(Float.java:417)
at dm_pc_play_kpi.__loadFromFields(dm_pc_play_kpi.java:335)
at dm_pc_play_kpi.parse(dm_pc_play_kpi.java:282)
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:83)
... 10 more
3 分隔符错误
Hive中的分隔符是’\t’ 但是导出写成’|’
sqoop export --connect jdbc:mysql://192.168.119.129:3306/student?characterEncoding=utf8 --username li72 --password 123 --table dm_trlog --export-dir /home/bigdata/hive/data/db1.db/trlog --input-fields-terminated-by ‘|‘ --null-non-string ‘0‘ --null-string ‘0‘;
为了测试，特意把分隔符改成 "|"
14/11/06 01:50:19 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead.
14/11/06 01:50:19 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset.
14/11/06 01:50:19 INFO tool.CodeGenTool: Beginning code generation
14/11/06 01:50:20 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `dm_trlog` AS t LIMIT 1
14/11/06 01:50:21 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `dm_trlog` AS t LIMIT 1
14/11/06 01:50:21 INFO orm.CompilationManager: HADOOP_MAPRED_HOME is /home/bigdata/hadoop
Note: /tmp/sqoop-root/compile/e474b3f8292f91dd4134b302ae35df19/dm_trlog.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
14/11/06 01:50:25 INFO orm.CompilationManager: Writing jar file: /tmp/sqoop-root/compile/e474b3f8292f91dd4134b302ae35df19/dm_trlog.jar
14/11/06 01:50:25 INFO mapreduce.ExportJobBase: Beginning export of dm_trlog
14/11/06 01:50:45 INFO input.FileInputFormat: Total input paths to process : 1
14/11/06 01:50:45 INFO input.FileInputFormat: Total input paths to process : 1
14/11/06 01:50:45 INFO util.NativeCodeLoader: Loaded the native-hadoop library
14/11/06 01:50:45 WARN snappy.LoadSnappy: Snappy native library not loaded
14/11/06 01:50:51 INFO mapred.JobClient: Running job: job_201411060114_0003
14/11/06 01:50:52 INFO mapred.JobClient: map 0% reduce 0%
14/11/06 01:51:20 INFO mapred.JobClient: Task Id : attempt_201411060114_0003_m_000000_0, Status : FAILED
java.io.IOException: Can‘t export data, please check task tracker logs
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:112)
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:39)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
at org.apache.sqoop.mapreduce.AutoProgressMapper.run(AutoProgressMapper.java:64)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.util.NoSuchElementException
at java.util.AbstractList$Itr.next(AbstractList.java:350)
at dm_trlog.__loadFromFields(dm_trlog.java:252)
at dm_trlog.parse(dm_trlog.java:201)
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:83)
... 10 more
14/11/06 01:51:21 INFO mapred.JobClient: Task Id : attempt_201411060114_0003_m_000001_0, Status : FAILED
java.io.IOException: Can‘t export data, please check task tracker logs
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:112)
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:39)
at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
at org.apache.sqoop.mapreduce.AutoProgressMapper.run(AutoProgressMapper.java:64)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1149)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.util.NoSuchElementException
at java.util.AbstractList$Itr.next(AbstractList.java:350)
at dm_trlog.__loadFromFields(dm_trlog.java:252)
at dm_trlog.parse(dm_trlog.java:201)
at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:83)
... 10 more
这样的报错应该是分隔符的问题
那怎么解决呢？
4 mysql的网络不在集群网络中
sqoop export --connect jdbc:mysql://192.168.119.1:3306/student?characterEncoding=utf8 --username li72 --password 123 --table dm_trlog --export-dir /home/bigdata/hive/data/db1.db/trlog --input-fields-terminated-by ‘\t‘ --null-non-string ‘0‘ --null-string ‘0‘;
Warning: $HADOOP_HOME is deprecated.
14/11/06 02:04:29 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead.
14/11/06 02:04:30 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset.
14/11/06 02:04:30 INFO tool.CodeGenTool: Beginning code generation
14/11/06 02:07:40 ERROR manager.SqlManager: Error executing statement: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1117)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:355)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2461)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2498)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2283)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:822)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:404)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at org.apache.sqoop.manager.SqlManager.makeConnection(SqlManager.java:745)
at org.apache.sqoop.manager.GenericJdbcManager.getConnection(GenericJdbcManager.java:52)
at org.apache.sqoop.manager.SqlManager.execute(SqlManager.java:605)
at org.apache.sqoop.manager.SqlManager.execute(SqlManager.java:628)
at org.apache.sqoop.manager.SqlManager.getColumnTypesForRawQuery(SqlManager.java:235)
at org.apache.sqoop.manager.SqlManager.getColumnTypes(SqlManager.java:219)
at org.apache.sqoop.manager.ConnManager.getColumnTypes(ConnManager.java:283)
at org.apache.sqoop.orm.ClassWriter.getColumnTypes(ClassWriter.java:1255)
at org.apache.sqoop.orm.ClassWriter.generate(ClassWriter.java:1072)
at org.apache.sqoop.tool.CodeGenTool.generateORM(CodeGenTool.java:82)
at org.apache.sqoop.tool.ExportTool.exportTable(ExportTool.java:64)
at org.apache.sqoop.tool.ExportTool.run(ExportTool.java:100)
at org.apache.sqoop.Sqoop.run(Sqoop.java:145)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:181)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:220)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:229)
at org.apache.sqoop.Sqoop.main(Sqoop.java:238)
Caused by: java.net.ConnectException: Connection timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at java.net.Socket.<init>(Socket.java:375)
at java.net.Socket.<init>(Socket.java:218)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:305)
... 32 more
5 mysql停止服务
14/11/06 04:55:25 DEBUG tool.BaseSqoopTool: Enabled debug logging.
14/11/06 04:55:25 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead.
14/11/06 04:55:25 DEBUG sqoop.ConnFactory: Loaded manager factory: com.cloudera.sqoop.manager.DefaultManagerFactory
14/11/06 04:55:25 DEBUG sqoop.ConnFactory: Trying ManagerFactory: com.cloudera.sqoop.manager.DefaultManagerFactory
14/11/06 04:55:25 DEBUG manager.DefaultManagerFactory: Trying with scheme: jdbc:mysql:
14/11/06 04:55:25 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset.
14/11/06 04:55:25 DEBUG sqoop.ConnFactory: Instantiated ConnManager org.apache.sqoop.manager.MySQLManager@8a0d5d
14/11/06 04:55:25 INFO tool.CodeGenTool: Beginning code generation
14/11/06 04:55:26 DEBUG manager.SqlManager: No connection paramenters specified. Using regular API for making connection.
14/11/06 04:55:27 ERROR manager.SqlManager: Error executing statement: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1117)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:355)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2461)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2498)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2283)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:822)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:404)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at org.apache.sqoop.manager.SqlManager.makeConnection(SqlManager.java:745)
at org.apache.sqoop.manager.GenericJdbcManager.getConnection(GenericJdbcManager.java:52)
at org.apache.sqoop.manager.SqlManager.execute(SqlManager.java:605)
at org.apache.sqoop.manager.SqlManager.execute(SqlManager.java:628)
at org.apache.sqoop.manager.SqlManager.getColumnTypesForRawQuery(SqlManager.java:235)
at org.apache.sqoop.manager.SqlManager.getColumnTypes(SqlManager.java:219)
at org.apache.sqoop.manager.ConnManager.getColumnTypes(ConnManager.java:283)
at org.apache.sqoop.orm.ClassWriter.getColumnTypes(ClassWriter.java:1255)
at org.apache.sqoop.orm.ClassWriter.generate(ClassWriter.java:1072)
at org.apache.sqoop.tool.CodeGenTool.generateORM(CodeGenTool.java:82)
at org.apache.sqoop.tool.ExportTool.exportTable(ExportTool.java:64)
at org.apache.sqoop.tool.ExportTool.run(ExportTool.java:100)
at org.apache.sqoop.Sqoop.run(Sqoop.java:145)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:181)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:220)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:229)
at org.apache.sqoop.Sqoop.main(Sqoop.java:238)
Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at java.net.Socket.<init>(Socket.java:375)
at java.net.Socket.<init>(Socket.java:218)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:305)
... 32 more
14/11/06 04:55:27 DEBUG manager.SqlManager: No connection paramenters specified. Using regular API for making connection.
14/11/06 04:55:27 ERROR manager.CatalogQueryManager: Failed to list columns from query: SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = (SELECT SCHEMA()) AND TABLE_NAME = ‘dm_trlog‘
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1117)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:355)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2461)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2498)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2283)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:822)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:404)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at org.apache.sqoop.manager.SqlManager.makeConnection(SqlManager.java:745)
at org.apache.sqoop.manager.GenericJdbcManager.getConnection(GenericJdbcManager.java:52)
at org.apache.sqoop.manager.CatalogQueryManager.getColumnNames(CatalogQueryManager.java:147)
at org.apache.sqoop.orm.ClassWriter.getColumnNames(ClassWriter.java:1222)
at org.apache.sqoop.orm.ClassWriter.generate(ClassWriter.java:1074)
at org.apache.sqoop.tool.CodeGenTool.generateORM(CodeGenTool.java:82)
at org.apache.sqoop.tool.ExportTool.exportTable(ExportTool.java:64)
at org.apache.sqoop.tool.ExportTool.run(ExportTool.java:100)
at org.apache.sqoop.Sqoop.run(Sqoop.java:145)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:181)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:220)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:229)
at org.apache.sqoop.Sqoop.main(Sqoop.java:238)
Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at java.net.Socket.<init>(Socket.java:375)
at java.net.Socket.<init>(Socket.java:218)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:305)
... 28 more
14/11/06 04:55:27 ERROR sqoop.Sqoop: Got exception running Sqoop: java.lang.RuntimeException: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
java.lang.RuntimeException: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
6 Sqoop调式信息
增加关键字--verbose
sqoop export --connect jdbc:mysql://192.168.119.129:3306/student?characterEncoding=utf8 --username li72 --password 123 --verbose --table dm_trlog --export-dir /home/bigdata/hive/data/db1.db/trlog --input-fields-terminated-by ‘\t‘ --null-non-string ‘0‘ --null-string ‘0‘;
7 修改生成的Java类，重新打包。
每次通过sqoop导入MySql的时，都会生成一个以MySql表命名的.java文件，然后打成JAR包，给sqoop提交给hadoop 的MR来解析Hive表中的数据。那可以根据报的错误，找到对应的行，改写该文件，编译，重新打包，sqoop可以通过 -jar-file ，--class-name 组合让我们指定运行自己的jar包中的某个class。来解析该hive表中的每行数据。脚本如下：一个完整的例子如下：
./bin/sqoop export --connect "jdbc:mysql://cmg3.chamago.com/ehub?useUnicode=true&characterEncoding=utf-8"
--username gavin.peng --password gavin.peng --table bi_weekly_sales_item
--export-dir /hive/warehouse/hive_bi_weekly_sales_item --input-fields-terminated-by ‘\t‘
--input-null-string ‘\\N‘ --input-null-non-string ‘\\N‘
--class-name com.chamago.sqoop.codegen.bi_weekly_sales_item
--jar-file /tmp/sqoop-chamago/bi_weekly_sales_item.jar
上面--jar-file 参数指定jar包的路径。--class-name 指定jar包中的class。
这样就可以解决所有解析异常了。
Sqoop命令行说明
Common arguments:
--connect <jdbc-uri> Specify JDBC connect
string
--connection-manager <class-name> Specify connection manager
class name
--connection-param-file <properties-file> Specify connection
parameters file
--driver <class-name> Manually specify JDBC
driver class to use
--hadoop-home <hdir> Override
$HADOOP_MAPRED_HOME_ARG
--hadoop-mapred-home <dir> Override
$HADOOP_MAPRED_HOME_ARG
--help Print usage instructions
-P Read password from console
--password <password> Set authentication
password
--password-file <password-file> Set authentication
password file path
--relaxed-isolation Use read-uncommitted
isolation for imports
--skip-dist-cache Skip copying jars to
distributed cache
--username <username> Set authentication
username
--verbose Print more information
while working
Import control arguments:
--append Imports data
in append
mode
--as-avrodatafile Imports data
to Avro data
files
--as-sequencefile Imports data
to
SequenceFile
s
--as-textfile Imports data
as plain
text
(default)
--boundary-query <statement> Set boundary
query for
retrieving
max and min
value of the
primary key
--columns <col,col,col...> Columns to
import from
table
--compression-codec <codec> Compression
codec to use
for import
--delete-target-dir Imports data
in delete
mode
--direct Use direct
import fast
path
--direct-split-size <n> Split the
input stream
every 'n'
bytes when
importing in
direct mode
-e,--query <statement> Import
results of
SQL
'statement'
--fetch-size <n> Set number
'n' of rows
to fetch
from the
database
when more
rows are
needed
--inline-lob-limit <n> Set the
maximum size
for an
inline LOB
-m,--num-mappers <n> Use 'n' map
tasks to
import in
parallel
--mapreduce-job-name <name> Set name for
generated
mapreduce
job
--split-by <column-name> Column of
the table
used to
split work
units
--table <table-name> Table to
read
--target-dir <dir> HDFS plain
table
destination
--validate Validate the
copy using
the
configured
validator
--validation-failurehandler <validation-failurehandler> Fully
qualified
class name
for
ValidationFa
ilureHandler
--validation-threshold <validation-threshold> Fully
qualified
class name
for
ValidationTh
reshold
--validator <validator> Fully
qualified
class name
for the
Validator
--warehouse-dir <dir> HDFS parent
for table
destination
--where <where clause> WHERE clause
to use
during
import
-z,--compress Enable
compression
Incremental import arguments:
--check-column <column> Source column to check for incremental
change
--incremental <import-type> Define an incremental import of type
'append' or 'lastmodified'
--last-value <value> Last imported value in the incremental
check column
Output line formatting arguments:
--enclosed-by <char> Sets a required field enclosing
character
--escaped-by <char> Sets the escape character
--fields-terminated-by <char> Sets the field separator character
--lines-terminated-by <char> Sets the end-of-line character
--mysql-delimiters Uses MySQL's default delimiter set:
fields: , lines: \n escaped-by: optionally-enclosed-by: '
--optionally-enclosed-by <char> Sets a field enclosing character
Input parsing arguments:
--input-enclosed-by <char> Sets a required field encloser
--input-escaped-by <char> Sets the input escape
character
--input-fields-terminated-by <char> Sets the input field separator
--input-lines-terminated-by <char> Sets the input end-of-line
char
--input-optionally-enclosed-by <char> Sets a field enclosing
character
Hive arguments:
--create-hive-table Fail if the target hive
table exists
--hive-database <database-name> Sets the database name to
use when importing to hive
--hive-delims-replacement <arg> Replace Hive record \0x01
and row delimiters (\n\r)
from imported string fields
with user-defined string
--hive-drop-import-delims Drop Hive record \0x01 and
row delimiters (\n\r) from
imported string fields
--hive-home <dir> Override $HIVE_HOME
--hive-import Import tables into Hive
(Uses Hive's default
delimiters if none are
set.)
--hive-overwrite Overwrite existing data in
the Hive table
--hive-partition-key <partition-key> Sets the partition key to
use when importing to hive
--hive-partition-value <partition-value> Sets the partition value to
use when importing to hive
--hive-table <table-name> Sets the table name to use
when importing to hive
--map-column-hive <arg> Override mapping for
specific column to hive
types.
HBase arguments:
--column-family <family> Sets the target column family for the
import
--hbase-bulkload Enables HBase bulk loading
--hbase-create-table If specified, create missing HBase tables
--hbase-row-key <col> Specifies which input column to use as the
row key
--hbase-table <table> Import to <table> in HBase
HCatalog arguments:
--hcatalog-database <arg> HCatalog database name
--hcatalog-home <hdir> Override $HCAT_HOME
--hcatalog-table <arg> HCatalog table name
--hive-home <dir> Override $HIVE_HOME
--hive-partition-key <partition-key> Sets the partition key to
use when importing to hive
--hive-partition-value <partition-value> Sets the partition value to
use when importing to hive
--map-column-hive <arg> Override mapping for
specific column to hive
types.
HCatalog import specific options:
--create-hcatalog-table Create HCatalog before import
--hcatalog-storage-stanza <arg> HCatalog storage stanza for table
creation
Accumulo arguments:
--accumulo-batch-size <size> Batch size in bytes
--accumulo-column-family <family> Sets the target column family for
the import
--accumulo-create-table If specified, create missing
Accumulo tables
--accumulo-instance <instance> Accumulo instance name.
--accumulo-max-latency <latency> Max write latency in milliseconds
--accumulo-password <password> Accumulo password.
--accumulo-row-key <col> Specifies which input column to
use as the row key
--accumulo-table <table> Import to <table> in Accumulo
--accumulo-user <user> Accumulo user name.
--accumulo-visibility <vis> Visibility token to be applied to
all rows imported
--accumulo-zookeepers <zookeepers> Comma-separated list of
zookeepers (host:port)
Code generation arguments:
--bindir <dir> Output directory for compiled
objects
--class-name <name> Sets the generated class name.
This overrides --package-name.
When combined with --jar-file,
sets the input class.
--input-null-non-string <null-str> Input null non-string
representation
--input-null-string <null-str> Input null string representation
--jar-file <file> Disable code generation; use
specified jar
--map-column-java <arg> Override mapping for specific
columns to java types
--null-non-string <null-str> Null non-string representation
--null-string <null-str> Null string representation
--outdir <dir> Output directory for generated
code
--package-name <name> Put auto-generated classes in
this package
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原文地址：http://blog.csdn.net/lili72/article/details/40899277
