SQOOP --where 不使用 --query

SQOOP --where is not working with --query

WHERE 子句不适用于 --where 以及 --query

sqoop import --connect "jdbc:mysql://quickstart.cloudera:3306/retail_db" --username "retail_dba" --password "cloudera" --target-dir "/user/cloudera/sqoop_import_tables/departments21" --query "select * From orders where $CONDITIONS" --where "order_id < 8000" --split-by order_id;

日志显示 "WHERE ( order_id < 8000 )" - 在 BoundingValsQuery 中忽略了条件:-

16/08/31 12:20:26 INFO db.DBInputFormat: Using read commited transaction isolation
16/08/31 12:20:26 INFO db.DataDrivenDBInputFormat: BoundingValsQuery: SELECT MIN(order_id), MAX(order_id) FROM (select * From orders where  (1 = 1) ) AS t1
16/08/31 12:20:26 INFO db.IntegerSplitter: Split size: 17220; Num splits: 4 from: 1 to: 68883
16/08/31 12:20:26 DEBUG db.IntegerSplitter: Splits: [                           1 to                       68,883] into 4 parts
16/08/31 12:20:26 DEBUG db.IntegerSplitter:                            1
16/08/31 12:20:26 DEBUG db.IntegerSplitter:                       17,222
16/08/31 12:20:26 DEBUG db.IntegerSplitter:                       34,443
16/08/31 12:20:26 DEBUG db.IntegerSplitter:                       51,663
16/08/31 12:20:26 DEBUG db.IntegerSplitter:                       68,883
16/08/31 12:20:26 DEBUG db.DataDrivenDBInputFormat: Creating input split with lower bound 'order_id >= 1' and upper bound 'order_id < 17222'
16/08/31 12:20:26 DEBUG db.DataDrivenDBInputFormat: Creating input split with lower bound 'order_id >= 17222' and upper bound 'order_id < 34443'
16/08/31 12:20:26 DEBUG db.DataDrivenDBInputFormat: Creating input split with lower bound 'order_id >= 34443' and upper bound 'order_id < 51663'
16/08/31 12:20:26 DEBUG db.DataDrivenDBInputFormat: Creating input split with lower bound 'order_id >= 51663' and upper bound 'order_id <= 68883'
16/08/31 12:20:26 INFO mapreduce.JobSubmitter: number of splits:4
16/08/31 12:20:26 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1472622587119_0024

WHERE 子句适用于 --where--table

sqoop import --connect "jdbc:mysql://quickstart.cloudera:3306/retail_db" --username "retail_dba" --password "cloudera" --target-dir "/user/cloudera/sqoop_import_tables/departments22" --table orders --where "order_id < 8000" --split-by order_id

日志显示 "WHERE ( order_id < 8000 )" - 满足条件。

16/08/31 12:34:35 INFO db.DataDrivenDBInputFormat: BoundingValsQuery: SELECT MIN(`order_id`), MAX(`order_id`) FROM `orders` WHERE ( order_id < 8000 )
16/08/31 12:34:35 INFO db.IntegerSplitter: Split size: 1999; Num splits: 4 from: 1 to: 7999
16/08/31 12:34:35 DEBUG db.IntegerSplitter: Splits: [                           1 to                        7,999] into 4 parts
16/08/31 12:34:35 DEBUG db.IntegerSplitter:                            1
16/08/31 12:34:35 DEBUG db.IntegerSplitter:                        2,001
16/08/31 12:34:35 DEBUG db.IntegerSplitter:                        4,001
16/08/31 12:34:35 DEBUG db.IntegerSplitter:                        6,000
16/08/31 12:34:35 DEBUG db.IntegerSplitter:                        7,999
16/08/31 12:34:35 DEBUG db.DataDrivenDBInputFormat: Creating input split with lower bound '`order_id` >= 1' and upper bound '`order_id` < 2001'
16/08/31 12:34:35 DEBUG db.DataDrivenDBInputFormat: Creating input split with lower bound '`order_id` >= 2001' and upper bound '`order_id` < 4001'
16/08/31 12:34:35 DEBUG db.DataDrivenDBInputFormat: Creating input split with lower bound '`order_id` >= 4001' and upper bound '`order_id` < 6000'
16/08/31 12:34:35 DEBUG db.DataDrivenDBInputFormat: Creating input split with lower bound '`order_id` >= 6000' and upper bound '`order_id` <= 7999'
16/08/31 12:34:35 INFO mapreduce.JobSubmitter: number of splits:4
  1. 任何逻辑原因,为什么 --where 选项不适用于 --query 而与 --table 一起使用?
  2. --query选项的情况下,我们如何使用--where来提供额外的过滤?
  3. 感谢任何关于此的文档。

您始终可以在自由格式查询中进行过滤,例如

... --query "select ... where order_id < 8000 and $CONDITIONS" ...

当然,在这里使用 query 选项是不必要的,因为无论如何您都选择了所有行。因此,您不妨删除查询部分并包含 --where "order_id < 8000"

基本上,这是一个或另一个(--query--where);使用两者没有意义。有关详细信息,请参阅 documentation

您的所有其他问题都已得到解答。我正在挑选 -

why the --where option is not working with --query and working with --table?

因为它会导致模棱两可的结果。

例如,

你把--where id > 100

--query "select * from table where order_id < 100 and $CONDITIONS"

现在您希望 sqoop 达到什么效果 return?

因此,从用户的角度来看,这可能会造成混淆并导致错误的结果。

您始终可以将 WHERE 条件放在 --query 中。所以不需要 --where 标签和 --query 标签。

--where--query.

的子集

使用自由格式查询 (--query) 如果你使用 --where 它将被 sqoop 忽略。 sqoop 将优先考虑 --query....

中提到的 where 子句