sqoop job从创建到执行

在学习sqoop job之前，最好先学习一下sqoop命令的导入导出

sqoop 使用 import 将 mysql 中数据导入到 hive

sqoop 使用 import 将 mysql 中数据导入到 hdfs

sqoop 使用 export 将 hive 中数据导出到 mysql

sqoop job

sqoop job 可将一些参数配置以及命令语句保存起来，方便调用。

接下来实现一个从mysql导入到hive的任务

• mysql建表，表名为 sqoop_job

  CREATE TABLE `sqoop_job` (
    `id` int() DEFAULT NULL,
    `name` varchar() DEFAULT NULL,
    `jobname` varchar() DEFAULT NULL
  ) ENGINE=InnoDB DEFAULT CHARSET=latin1

• 给sqoop_job插入测试数据

  insert into sqoop_job values(,"name1","jobname1");
  insert into sqoop_job values(,"name2","jobname2");
  insert into sqoop_job values(,"name3","jobname3");

• 将mysql表结构同步到hive

  sqoop create-hive-table --connect jdbc:mysql://localhost:3306/sqooptest --username root --password 123qwe --table sqoop_job
   --hive-table sqoop_job --fields-terminated-by ,

• 创建一个导入任务的sqoop job

  sqoop job --create sqoopimport1 -- import --connect jdbc:mysql://localhost:3306/sqooptest --username root -password 123qwe --table sqoop_job
   --hive-import --hive-table sqoop_job --fields-terminated-by ',' -m 1

  创建成功后可使用命令查看当前job列表

  sqoop job -list
  sqoop还支持查看已创建任务的参数配置
  使用命令 sqoop job --show jobname

  EFdeMacBook-Pro:sbin FengZhen$ sqoop job --show sqoopimport1
  Job: sqoopimport1
  Tool: import
  Options:
  ----------------------------
  verbose = false
  db.connect.string = jdbc:mysql://localhost:3306/sqooptest
  codegen.output.delimiters.escape =
  codegen.output.delimiters.enclose.required = false
  codegen.input.delimiters.field =
  hbase.create.table = false
  db.require.password = true
  hdfs.append.dir = false
  db.table = sqoop_job
  codegen.input.delimiters.escape =
  import.fetch.size = null
  accumulo.create.table = false
  codegen.input.delimiters.enclose.required = false
  db.username = root
  reset.onemapper = false
  codegen.output.delimiters.record =
  import.max.inline.lob.size =
  hbase.bulk.load.enabled = false
  hcatalog.create.table = false
  db.clear.staging.table = false
  codegen.input.delimiters.record =
  enable.compression = false
  hive.overwrite.table = false
  hive.import = true
  codegen.input.delimiters.enclose =
  hive.table.name = sqoop_job
  accumulo.batch.size =
  hive.drop.delims = false
  codegen.output.delimiters.enclose =
  hdfs.delete-target.dir = false
  codegen.output.dir = .
  codegen.auto.compile.dir = true
  relaxed.isolation = false
  mapreduce.num.mappers =
  accumulo.max.latency =
  import.direct.split.size =
  codegen.output.delimiters.field =
  export.new.update = UpdateOnly
  incremental.mode = None
  hdfs.file.format = TextFile
  codegen.compile.dir = /tmp/sqoop-FengZhen/compile/546e29b092f451585b5c8547b3e9985e
  direct.import = false
  hive.fail.table.exists = false
  db.batch = false

• 执行job
  sqoop job --exec sqoopimport1
  执行成功后可查看hive中表的数据

  hive> select * from sqoop_job;
  OK
      name1    jobname1
      name2    jobname2
      name3    jobname3
  Time taken: 1.618 seconds, Fetched:  row(s)

  Done.