Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Plain View
Hive >> mail # user >> S3/EMR Hive: Load contents of a single file

Tony Burton 2013-03-26, 17:11
Ramki Palle 2013-03-26, 17:41
Sanjay Subramanian 2013-03-26, 17:21
Copy link to this message
RE: S3/EMR Hive: Load contents of a single file

Thanks for the quick reply Sanjay.

ALTER TABLE is the key, but slightly different to your suggestion. I create the table as before, but don't specify location:

$ create external table myData (str1 string, str2 string, count1 int) partitioned by <snip> row format <snip> stored as textfile;

Then use ALTER TABLE like this:

$ ALTER TABLE myData SET LOCATION ' s3://mybucket/path/to/data/src1.txt ';

Bingo, I can now run queries with myData in the same way I can when the LOCATION is a directory. Cool!


From: Sanjay Subramanian [mailto:[EMAIL PROTECTED]]
Sent: 26 March 2013 17:22
Subject: Re: S3/EMR Hive: Load contents of a single file

Hi Tony

Can u create the table without any location.

After that you could do an ALTER TABLE add location and partition

ALTER TABLE myData ADD PARTITION (partitionColumn1='$value1' , partitionColumn2='$value2') LOCATION '/path/to/your/directory/in/hdfs';"
An example Without Partitions
While specifying location, you have to point to a directory. You cannot point to a file (IMHO).

Hope that helps


From: Tony Burton <[EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>>
Date: Tuesday, March 26, 2013 10:11 AM
Subject: S3/EMR Hive: Load contents of a single file

Hi list,

I've been using hive to perform queries on data hosted on AWS S3, and my tables point at data by specifying the directory in which the data is stored, eg

$ create external table myData (str1 string, str2 string, count1 int) partitioned by <snip> row format <snip> stored as textfile location 's3://mybucket/path/to/data';

where s3://mybucket/path/to/data is the "directory" that contains the files I'm interested in. My use case now is to create a table with data pointing to a specifc file in a directory:

$ create external table myData (str1 string, str2 string, count1 int) partitioned by <snip> row format <snip> stored as textfile location 's3://mybucket/path/to/data/src1.txt';

and I get the error: "FAILED: Error in metadata: MetaException(message:Got exception: java.io.IOException Can't make directory for path 's3://spinmetrics/global/counter_Fixture.txt' since it is a file.)". Ok, lets try to create the table without specifying the data source:

$ create external table myData (str1 string, str2 string, count1 int) partitioned by <snip> row format <snip> stored as textfile

Ok, no problem. Now lets load the data

$ LOAD DATA INPATH 's3://mybucket/path/to/data/src1.txt' INTO TABLE myData;

(referring to https://cwiki.apache.org/Hive/languagemanual-dml.html - "...filepath can refer to a file (in which case hive will move the file into the table)")

Error message is: " FAILED: Error in semantic analysis: Line 1:17 Path is not legal ''s3://mybucket/path/to/data/src1.txt": Move from: s3:// mybucket/path/to/data/src1.txt to: hdfs:// is not valid. Please check that values for params "default.fs.name" and "hive.metastore.warehouse.dir" do not conflict."

So I check my default.fs.name and hive.metastore.warehouse.dir (which have never caused problems before):

$ set fs.default.name;
$ set hive.metastore.warehouse.dir;

Clearly different, but which is correct? Is there an easier way to load a single file into a hive table? Or should I just put each file in a directory and proceed as before?



Tony Burton
Senior Software Engineer
[cid:[EMAIL PROTECTED]8FD0]<http://www.sportingsolutions.com/>

PPlease consider the environment before printing this email or attachments

This email and any attachments are confidential, protected by copyright and may be legally privileged. If you are not the intended recipient, then the dissemination or copying of this email is prohibited. If you have received this in error, please notify the sender by replying by email and then delete the email completely from your system. Neither Sporting Index nor the sender accepts responsibility for any virus, or any other defect which might affect any computer or IT system into which the email is received and/or opened. It is the responsibility of the recipient to scan the email and no responsibility is accepted for any loss or damage arising in any way from receipt or use of this email. Sporting Index Ltd is a company registered in England and Wales with company number 2636842, whose registered office is at Gateway House, Milverton Street, London, SE11 4AP. Sporting Index Ltd is authorised and regulated by the UK Financial Services Authority (reg. no. 150404) and Gambling Commission (reg. no. 000-027343-R-308898-001). Any financial promotion contained herein has been issued and approved by Sporting Index Ltd.

Outbound email has been scanned for viruses and SPAM

=====================This email message and any attachments are for the exclusive use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message along with any attachments, from your computer system. If you are the intended recipient, please be advised that the content of this message is subject to access, review and disclosure by the sender's Email System Administrator.
Sanjay Subramanian 2013-03-26, 17:41
Tony Burton 2013-03-26, 17:45
Keith Wiley 2013-03-26, 19:39
Tony Burton 2013-03-27, 08:46
Tony Burton 2013-03-27, 09:58
Keith Wiley 2013-03-27, 17:02
Tony Burton 2013-03-27, 17:18