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From "Martin, Nick" <NiMar...@pssd.com>
Subject RE: Sqoop from/to Oracle
Date Wed, 30 Oct 2013 19:38:35 GMT
Ok, here's an update on this. I'm going to provide as much intel as possible but let me know
if folks need more context. Appreciate the help in advance...


1.     Process I'm testing: Source table in Oracle 11.2.0.3 > Sqoop Import to HDFS >
Sqoop Export from HDFS > Target table in Oracle 11.2.0.3 (source and target have exact
same DDL) (note: Sqoop version is 1.4.3.1.3.2.0-111)



2.     Source/target table schema:
column type
COL1    NUMBER
COL2    VARCHAR2(3 BYTE)
COL3    VARCHAR2(2 BYTE)
COL4    VARCHAR2(2 BYTE)
COL5    NUMBER
COL6    VARCHAR2(60 BYTE)
COL7    VARCHAR2(70 BYTE)
COL8    VARCHAR2(70 BYTE)
COL9    VARCHAR2(40 BYTE)
COL10  VARCHAR2(3 BYTE)
COL11  VARCHAR2(12 BYTE)
COL12  VARCHAR2(30 BYTE)
COL13  DATE
COL14  VARCHAR2(1 BYTE)
COL15  VARCHAR2(70 BYTE)
COL16  VARCHAR2(70 BYTE)
COL17  DATE
COL18  VARCHAR2(30 BYTE)
COL19  DATE
COL20  VARCHAR2(30 BYTE)
COL21  VARCHAR2(3 BYTE)
COL22  NUMBER
COL23  VARCHAR2(30 BYTE)
COL24  DATE
COL25  VARCHAR2(1 BYTE)


3.     Sqoop import syntax: sqoop import --table  schema.table_name -m 8 --target-dir path/to_dir
--connect jdbc:oracle:thin:@xxx.xxx.com:0000/schema --username xxx --password xxx

    Import doesn't fail; record count imported into HDFS matches the rowcount on the source
table

4.     Sqoop export syntax: sqoop export --connect jdbc:oracle:thin:@xxx.xxx.xxx.com:0000/schema
--table schema.table_name  --export-dir /path/to_dir --username xxx --password xxx

    Export fails with:

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:145)

        at org.apache.sqoop.mapreduce.AutoProgressMapper.run(AutoProgressMapper.java:64)

        at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:763)

        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:363)

        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:1232)

        at org.apache.hadoop.mapred.Child.main(Child.java:249)

Caused by: java.lang.IllegalArgumentException: Timestamp format must be yyyy-mm-dd hh:mm:ss[.fffffffff]

        at java.sql.Timestamp.valueOf(Timestamp.java:194)

        at tableinfo.__loadFromFields(tableinfo.java:939)

        at tableinfo.parse(schema_tableinfo.java:776)

        at org.apache.sqoop.mapreduce.TextExportMapper.map(TextExportMapper.java:83)

        ... 10 more

Venkat - I tried your suggestion below and the same failure happened (although I checked in
HDFS and it did indeed bring the DATE in without flipping to TIMESTAMP).

Any ideas? Need any other info?



From: Venkat Ranganathan [mailto:vranganathan@hortonworks.com]
Sent: Wednesday, October 30, 2013 12:55 AM
To: user@sqoop.apache.org
Subject: Re: Sqoop from/to Oracle

One thing that you may want to do (depending on the version of Oracle you are using) is to
setup a connection parameter file (please see --connection-param-file option) and have one
Oracle JDBC connection parameter set to not convert Data to timestamps

oracle.jdbc.mapDateToTimestamp=false


On Tue, Oct 29, 2013 at 5:32 PM, Martin, Nick <NiMartin@pssd.com<mailto:NiMartin@pssd.com>>
wrote:
Weird...let me re-test and if it fails again I'll include some sample data and the error output.

Thanks for the help Abe!

From: Abraham Elmahrek [mailto:abe@cloudera.com<mailto:abe@cloudera.com>]
Sent: Tuesday, October 29, 2013 7:06 PM

To: user@sqoop.apache.org<mailto:user@sqoop.apache.org>
Subject: Re: Sqoop from/to Oracle

Nick,

I haven't tested this, but Sqoop should accept full timestamps when exporting into DATE columns.
If the data you're exporting has a full timestamp (as it should after import), then the export
job should just work.

-Abe

On Mon, Oct 28, 2013 at 9:55 AM, Martin, Nick <NiMartin@pssd.com<mailto:NiMartin@pssd.com>>
wrote:
Hi Abe,

After doing some digging on this issue I've found I'm facing what seems like a fairly common
issue with importing data from an Oracle DATE column and trying to export that same data (from
HDFS) back into an Oracle DATE column (of course, it will have been converted to a timestamp
on the way into HDFS).

So, what's the current thinking on the best way to get around this issue?

Thanks,
Nick



From: Abraham Elmahrek [mailto:abe@cloudera.com<mailto:abe@cloudera.com>]
Sent: Tuesday, October 01, 2013 7:31 PM

To: user@sqoop.apache.org<mailto:user@sqoop.apache.org>
Subject: Re: Sqoop from/to Oracle

Nick,

It looks like Sqoop believes the format of the timestamps are incorrect. Could you please
inspect the data you are attempting to import and verify the columns are aligned and the data
is correctly formatted? I believe if you use the --verbose option, Sqoop will give more details
in its own logs and the tasks logs. Can you post the task logs back here?

Some other information that might be helpful to us is an example of the data you're trying
to export and the schema of the table you're importing to.

-Abe

On Tue, Oct 1, 2013 at 4:11 PM, Martin, Nick <NiMartin@pssd.com<mailto:NiMartin@pssd.com>>
wrote:
Hi Abe,

Just checking in to see if you had any suggestions for me to try?

Thanks again,
Nick

Sent from my iPhone

On Sep 30, 2013, at 6:36 PM, "Abraham Elmahrek" <abe@cloudera.com<mailto:abe@cloudera.com>>
wrote:
Nick,

What is the exact command you are using and the exact error you are seeing? Also, what version
of sqoop are you using?

-Abe

On Mon, Sep 30, 2013 at 3:32 PM, Martin, Nick <NiMartin@pssd.com<mailto:NiMartin@pssd.com>>
wrote:
Hi all,

I have a table I've imported from Oracle into HDFS and now I want to export it into an Oracle
Db (import and export table schemas are identical).

My initial attempt at exporting from HDFS (using Sqoop) to Oracle failed (data types failures).
So, my question is what's the best way for me to accomplish this? My source table is a mixture
of NUMBER, VARCHAR, DATE fields. Am I better off importing into a Hive table I define and
then exporting into Oracle from there? Or do I just need to do some export formatting in my
Sqoop export statement?

Any other intel you'd need to make a recommendation?

Thanks in advance,
Nick

Sent from my iPhone





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