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From "Venkat Ranganathan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SQOOP-1293) --hive-import causes --target-dir and --warehouse-dir to not be respected, nor --delete-target-dir
Date Fri, 14 Mar 2014 23:42:44 GMT

    [ https://issues.apache.org/jira/browse/SQOOP-1293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13935828#comment-13935828
] 

Venkat Ranganathan commented on SQOOP-1293:
-------------------------------------------

When you do a hive-import,  Sqoop internally stages the data and then uses the Hive LOAD statement
which moves the data to the hive warehouse.  The difference between warehouse-dir and target-dir
determine whether the data lands directly on to the defined directory (--target-dir) or the
directory is treated as a parent dir for the subdirectory where data lands.

After the HDFS move done by the Hive LOAD statement execution, the directory will be empty.
  

If you don't use --hive-import, then you will see the data still in tact there (but then you
have to use someother mechanism to get the data loaded)

I would suggest using hcatalog support to move data into/out of Hive.   That is somewhat easier
to handle, has less of data fidelity issues and makes your code storage type agnostic 


> --hive-import causes --target-dir and --warehouse-dir to not be respected, nor --delete-target-dir
> --------------------------------------------------------------------------------------------------
>
>                 Key: SQOOP-1293
>                 URL: https://issues.apache.org/jira/browse/SQOOP-1293
>             Project: Sqoop
>          Issue Type: Bug
>          Components: connectors/sqlserver, hive-integration
>    Affects Versions: 1.4.4
>         Environment: Hortonworks Sandbox 2.0
>            Reporter: Hari Sekhon
>
> Hi,
> I'm importing a table from SQL Server 2012 and am using --hive-import to create the metadata
automatically, but am finding that it causes --target-dir and --warehouse-dir to not be respected,
nor --delete-target-dir.
> sqoop import --connect "jdbc:sqlserver://x.x.x.x:1533;database=MyDatabase" --username
omitted --password omitted --driver com.microsoft.sqlserver.jdbc.SQLServerDriver --table "cube.DimCounterParty"
--split-by CounterpartyKey --hive-import --target-dir /MyDatabase/CounterParty --delete-target-dir
> (fyi I'm using --driver to work around bug SQOOP-1292)
> So I tried --warehouse-dir in case it needed that instead of --target-dir
> sqoop import --connect "jdbc:sqlserver://x.x.x.x:1533;database=MyDatabase" --username
omitted --password omitted --driver com.microsoft.sqlserver.jdbc.SQLServerDriver --table "cube.DimCounterParty"
--split-by CounterpartyKey --hive-import --warehouse-dir /MyDatabase/CounterParty --delete-target-dir
> but in both cases it ingested the data to /apps/hive/warehouse/cube.db/dimcounterparty.
> What's also strange is that it created the directory specified for --warehouse-dir but
then didn't appear to place the data in it.
> I wanted to use --delete-target-dir to replace the whole table each time for this test
since the source table is only ~650,000 rows and 185MB.
> What I've found is that on top of ingesting in to /apps/hive/warehouse/cube.db/dimcounterparty
by disregarding --delete-target-dir it is causing the table volume to grow cumulatively for
each run, such that after a few runs the {noformat}select count(*){noformat} on the table
now shows 5,546,661 rows instead of 650,000.
> Here is the the hive warehouse directory on HDFS where you can see the accumulation of
the data:
> {noformat}
>  hadoop fs -ls /apps/hive/warehouse/cube.db/dimcounterparty/
> Found 40 items
> -rw-r--r--   3 root hdfs          0 2014-03-07 08:44 /apps/hive/warehouse/cube.db/dimcounterparty/_SUCCESS
> -rw-r--r--   3 root hdfs          0 2014-03-07 09:10 /apps/hive/warehouse/cube.db/dimcounterparty/_SUCCESS_copy_1
> -rw-r--r--   3 root hdfs          0 2014-03-07 09:33 /apps/hive/warehouse/cube.db/dimcounterparty/_SUCCESS_copy_2
> -rw-r--r--   3 root hdfs          0 2014-03-07 09:37 /apps/hive/warehouse/cube.db/dimcounterparty/_SUCCESS_copy_3
> -rw-r--r--   3 root hdfs          0 2014-03-07 09:42 /apps/hive/warehouse/cube.db/dimcounterparty/_SUCCESS_copy_4
> -rw-r--r--   3 root hdfs          0 2014-03-07 10:04 /apps/hive/warehouse/cube.db/dimcounterparty/_SUCCESS_copy_5
> -rw-r--r--   3 root hdfs          0 2014-03-07 10:14 /apps/hive/warehouse/cube.db/dimcounterparty/_SUCCESS_copy_6
> -rw-r--r--   3 root hdfs          0 2014-03-07 10:16 /apps/hive/warehouse/cube.db/dimcounterparty/_SUCCESS_copy_7
> -rw-r--r--   3 root hdfs   49044407 2014-03-07 08:44 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00000
> -rw-r--r--   3 root hdfs   49045389 2014-03-07 09:10 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00000_copy_1
> -rw-r--r--   3 root hdfs   49045944 2014-03-07 09:33 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00000_copy_2
> -rw-r--r--   3 root hdfs   49045944 2014-03-07 09:37 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00000_copy_3
> -rw-r--r--   3 root hdfs   49045944 2014-03-07 09:41 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00000_copy_4
> -rw-r--r--   3 root hdfs   49045944 2014-03-07 10:04 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00000_copy_5
> -rw-r--r--   3 root hdfs   49045944 2014-03-07 10:14 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00000_copy_6
> -rw-r--r--   3 root hdfs   49045944 2014-03-07 10:15 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00000_copy_7
> -rw-r--r--   3 root hdfs   52363518 2014-03-07 08:44 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00001
> -rw-r--r--   3 root hdfs   52363912 2014-03-07 09:10 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00001_copy_1
> -rw-r--r--   3 root hdfs   52364256 2014-03-07 09:33 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00001_copy_2
> -rw-r--r--   3 root hdfs   52364256 2014-03-07 09:37 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00001_copy_3
> -rw-r--r--   3 root hdfs   52364256 2014-03-07 09:41 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00001_copy_4
> -rw-r--r--   3 root hdfs   52364256 2014-03-07 10:03 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00001_copy_5
> -rw-r--r--   3 root hdfs   52364256 2014-03-07 10:14 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00001_copy_6
> -rw-r--r--   3 root hdfs   52364256 2014-03-07 10:15 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00001_copy_7
> -rw-r--r--   3 root hdfs   51796051 2014-03-07 08:44 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00002
> -rw-r--r--   3 root hdfs   51796027 2014-03-07 09:10 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00002_copy_1
> -rw-r--r--   3 root hdfs   51796623 2014-03-07 09:33 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00002_copy_2
> -rw-r--r--   3 root hdfs   51796623 2014-03-07 09:37 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00002_copy_3
> -rw-r--r--   3 root hdfs   51796623 2014-03-07 09:41 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00002_copy_4
> -rw-r--r--   3 root hdfs   51796623 2014-03-07 10:03 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00002_copy_5
> -rw-r--r--   3 root hdfs   51796623 2014-03-07 10:14 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00002_copy_6
> -rw-r--r--   3 root hdfs   51796623 2014-03-07 10:15 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00002_copy_7
> -rw-r--r--   3 root hdfs   45445570 2014-03-07 08:44 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00003
> -rw-r--r--   3 root hdfs   45445544 2014-03-07 09:10 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00003_copy_1
> -rw-r--r--   3 root hdfs   45445719 2014-03-07 09:33 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00003_copy_2
> -rw-r--r--   3 root hdfs   45445719 2014-03-07 09:37 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00003_copy_3
> -rw-r--r--   3 root hdfs   45445719 2014-03-07 09:42 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00003_copy_4
> -rw-r--r--   3 root hdfs   45445719 2014-03-07 10:04 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00003_copy_5
> -rw-r--r--   3 root hdfs   45445719 2014-03-07 10:14 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00003_copy_6
> -rw-r--r--   3 root hdfs   45445719 2014-03-07 10:16 /apps/hive/warehouse/cube.db/dimcounterparty/part-m-00003_copy_7
> {noformat}
> Is this a bug that it doesn't respect --target-dir or at least --warehouse-dir?
> This highlights another issue that this should be more intuitive and/or {noformat}sqoop
import --help{noformat} should make it easier to see what options are (not) compatible, or
it should specify in the output at job initiation time where switches will be disregarded,
such as it does when using {noformat}--hive-<option>{noformat} without {noformat}--hive-import{noformat}
> In my last place I recall using sqoop create-hive-table to generate the metadata after
import and then editing the table location metadata. It would be a lot better if we could
fix the behaviour of --hive-import to not require such a multi-step workaround.
> Thanks
> Hari Sekhon
> http://www.linkedin.com/in/harisekhon



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