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Hive >> mail # user >> S3/EMR Hive: Load contents of a single file


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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://10.48.97.97:9000/mnt/hive_081/warehouse/gfix 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;
fs.default.name=hdfs://10.48.97.97:9000
$ set hive.metastore.warehouse.dir;
hive.metastore.warehouse.dir=/mnt/hive_081/warehouse

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?

Thanks!

Tony

Tony Burton
Senior Software Engineer
e: [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]>

[cid:[EMAIL PROTECTED]3F90]<http://www.sportingsolutions.com/>

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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB