【Sqoop1】Sqoop1实战之Sqoop Job

前面两篇主要演示了Sqoop1进行数据的导入和导出，本篇主要演示如何使用Sqoop1对导入和导出任务创建Job。

1 查看Sqoop Job语法帮助
[hadoop@strong ~]$ sqoop help job
18/06/27 16:55:24 INFO sqoop.Sqoop: Running Sqoop version: 1.4.7
usage: sqoop job [GENERIC-ARGS] [JOB-ARGS] [-- [<tool-name>] [TOOL-ARGS]]

Job management arguments:
   --create <job-id>            Create a new saved job
   --delete <job-id>            Delete a saved job
   --exec <job-id>              Run a saved job
   --help                       Print usage instructions
   --list                       List saved jobs
   --meta-connect <jdbc-uri>    Specify JDBC connect string for the
                                metastore
   --show <job-id>              Show the parameters for a saved job
   --verbose                    Print more information while working

Generic Hadoop command-line arguments:
(must preceed any tool-specific arguments)
Generic options supported are
-conf <configuration file>     specify an application configuration file
-D <property=value>            use value for given property
-fs <local|namenode:port>      specify a namenode
-jt <local|resourcemanager:port>    specify a ResourceManager
-files <comma separated list of files>    specify comma separated files to be copied to the map reduce cluster
-libjars <comma separated list of jars>    specify comma separated jar files to include in the classpath.
-archives <comma separated list of archives>    specify comma separated archives to be unarchived on the compute machines.

The general command line syntax is
bin/hadoop command [genericOptions] [commandOptions]
2 创建Sqoop Job（非增量方式）

1）非增量导入命令
[hadoop@strong ~]$ sqoop import --connect jdbc:mysql://strong.hadoop.com:3306/sakila --username root --password root --table lang --warehouse-dir /user/sqoop1 -m 1
2）将上述命令改为以Job方式运行
[hadoop@strong ~]$ sqoop job --create lang_job -- import --connect jdbc:mysql://strong.hadoop.com:3306/sakila --username root --password root --table lang --warehouse-dir /us
er/sqoop1 -m 1
3）列出创建的Job
[hadoop@strong ~]$ sqoop job --list
18/06/27 17:29:51 INFO sqoop.Sqoop: Running Sqoop version: 1.4.7
Available jobs:
  lang_job
4）查看创建的Job
[hadoop@strong ~]$ sqoop job --show lang_job
18/06/27 17:30:14 INFO sqoop.Sqoop: Running Sqoop version: 1.4.7
Enter password: 
Job: lang_job
Tool: import
Options:
----------------------------
verbose = false
hcatalog.drop.and.create.table = false
db.connect.string = jdbc:mysql://strong.hadoop.com:3306/sakila
codegen.output.delimiters.escape = 0
codegen.output.delimiters.enclose.required = false
codegen.input.delimiters.field = 0
split.limit = null
hbase.create.table = false
mainframe.input.dataset.type = p
db.require.password = true
skip.dist.cache = false
hdfs.append.dir = false
db.table = lang
codegen.input.delimiters.escape = 0
accumulo.create.table = false
import.fetch.size = null
codegen.input.delimiters.enclose.required = false
db.username = root
reset.onemapper = false
codegen.output.delimiters.record = 10
import.max.inline.lob.size = 16777216
sqoop.throwOnError = false
hbase.bulk.load.enabled = false
hcatalog.create.table = false
db.clear.staging.table = false
codegen.input.delimiters.record = 0
hdfs.warehouse.dir = /user/sqoop1
enable.compression = false
hive.overwrite.table = false
hive.import = false
codegen.input.delimiters.enclose = 0
accumulo.batch.size = 10240000
hive.drop.delims = false
customtool.options.jsonmap = {}
codegen.output.delimiters.enclose = 0
hdfs.delete-target.dir = false
codegen.output.dir = .
codegen.auto.compile.dir = true
relaxed.isolation = false
mapreduce.num.mappers = 1
accumulo.max.latency = 5000
import.direct.split.size = 0
sqlconnection.metadata.transaction.isolation.level = 2
codegen.output.delimiters.field = 44
export.new.update = UpdateOnly
incremental.mode = None
hdfs.file.format = TextFile
sqoop.oracle.escaping.disabled = true
codegen.compile.dir = /tmp/sqoop-hadoop/compile/aeb58232c26c9414ca84080c52525881
direct.import = false
temporary.dirRoot = _sqoop
hive.fail.table.exists = false
db.batch = false
[hadoop@strong ~]$
5）执行Job
[hadoop@strong ~]$ sqoop job --exec lang_job
18/06/27 17:36:00 INFO sqoop.Sqoop: Running Sqoop version: 1.4.7
Enter password: 
18/06/27 17:36:06 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset.
18/06/27 17:36:06 INFO tool.CodeGenTool: Beginning code generation
Wed Jun 27 17:36:07 CST 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
18/06/27 17:36:07 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `lang` AS t LIMIT 1
18/06/27 17:36:07 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `lang` AS t LIMIT 1
18/06/27 17:36:07 INFO orm.CompilationManager: HADOOP_MAPRED_HOME is /usr/local/hadoop
---------剩余输出省略---------
6） 查看Job执行后的数据
[hadoop@strong ~]$ hdfs dfs -cat /user/sqoop1/lang/part-m-00000
1,2006-02-15 05:02:19.0,English
2,2006-02-15 05:02:19.0,Italian
3,2006-02-15 05:02:19.0,Japanese
4,2006-02-15 05:02:19.0,Mandarin
5,2006-02-15 05:02:19.0,French
6,2006-02-15 05:02:19.0,German
7,2018-06-26 16:51:34.0,Chinese
8,2018-06-26 17:54:54.0,GD
3 创建Sqoop Job（增量方式）

1）创建测试数据
mysql> update lang set name='Guangdonghua' ,last_update=current_timestamp where language_id=8 ;
Query OK, 1 row affected (0.70 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> insert into lang(language_id,name) values(9,'Português'),(10,'Russian');
Query OK, 2 rows affected (0.26 sec)
Records: 2  Duplicates: 0  Warnings: 0
2）增量导入命令
[hadoop@strong ~]$ sqoop import --connect jdbc:mysql://strong.hadoop.com:3306/sakila --username root --password root --table lang --warehouse-dir /user/sqoop1 --check-column 
last_update --incremental lastmodify --last-value '2018-06-26 17:54:54.0' --merge-key language_id -m 1
3）创建Job
[hadoop@strong ~]$ sqoop job --create incr_job -- import --connect jdbc:mysql://strong.hadoop.com:3306/sakila --username root -P --table lang --warehouse-dir /user/sqoop1 --c
heck-column last_update --incremental lastmodified --last-value '2018-06-26 17:54:54.0' --merge-key language_id -m 1
4）查看Job
[hadoop@strong ~]$ sqoop job --list
18/06/27 17:56:25 INFO sqoop.Sqoop: Running Sqoop version: 1.4.7
Available jobs:
  incr_job
  lang_job
5）运行Job
[hadoop@strong ~]$ sqoop job --exec incr_job
6）查看Job运行结果
[hadoop@strong ~]$ hdfs dfs -cat /user/sqoop1/lang/part-r-00000
1,2006-02-15 05:02:19.0,English
10,2018-06-27 17:49:56.0,Russian
2,2006-02-15 05:02:19.0,Italian
3,2006-02-15 05:02:19.0,Japanese
4,2006-02-15 05:02:19.0,Mandarin
5,2006-02-15 05:02:19.0,French
6,2006-02-15 05:02:19.0,German
7,2018-06-26 16:51:34.0,Chinese
8,2018-06-27 17:47:13.0,Guangdonghua
9,2018-06-27 17:49:56.0,Português
7）查看增量导入时的last_value值 
[hadoop@strong ~]$ sqoop job --show incr_job
18/06/27 18:01:08 INFO sqoop.Sqoop: Running Sqoop version: 1.4.7
Enter password: 
Job: incr_job
Tool: import
Options:
----------------------------
verbose = false
hcatalog.drop.and.create.table = false
incremental.last.value = 2018-06-27 17:57:00.0
db.connect.string = jdbc:mysql://strong.hadoop.com:3306/sakila
codegen.output.delimiters.escape = 0
codegen.output.delimiters.enclose.required = false
codegen.input.delimiters.field = 0
mainframe.input.dataset.type = p
split.limit = null
hbase.create.table = false
db.require.password = true
skip.dist.cache = false
hdfs.append.dir = false
db.table = lang
codegen.input.delimiters.escape = 0
accumulo.create.table = false
import.fetch.size = null
codegen.input.delimiters.enclose.required = false
db.username = root
reset.onemapper = false
codegen.output.delimiters.record = 10
import.max.inline.lob.size = 16777216
sqoop.throwOnError = false
hbase.bulk.load.enabled = false
hcatalog.create.table = false
db.clear.staging.table = false
incremental.col = last_update
codegen.input.delimiters.record = 0
hdfs.warehouse.dir = /user/sqoop1
enable.compression = false
hive.overwrite.table = false
hive.import = false
codegen.input.delimiters.enclose = 0
accumulo.batch.size = 10240000
hive.drop.delims = false
customtool.options.jsonmap = {}
codegen.output.delimiters.enclose = 0
hdfs.delete-target.dir = false
codegen.output.dir = .
codegen.auto.compile.dir = true
relaxed.isolation = false
mapreduce.num.mappers = 1
accumulo.max.latency = 5000
import.direct.split.size = 0
sqlconnection.metadata.transaction.isolation.level = 2
codegen.output.delimiters.field = 44
export.new.update = UpdateOnly
incremental.mode = DateLastModified
hdfs.file.format = TextFile
sqoop.oracle.escaping.disabled = true
codegen.compile.dir = /tmp/sqoop-hadoop/compile/13396563126bce459d370e97847a3507
direct.import = false
temporary.dirRoot = _sqoop
hive.fail.table.exists = false
merge.key.col = language_id
db.batch = false
[hadoop@strong ~]$
注：incremental.last.value = 2018-06-27 17:57:00.0已改为新值。


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原文地址：https://www.cnblogs.com/alen-liu-sz/p/12975630.html