Confirming compression is enabled for specific Hive tables - hadoop

Question

I need to benchmark a series of tables, some compressed and some not. I compress by setting:
hive> SET hive.exec.compress.output=true;
hive> SET mapred.output.compression.codec=org.apache.hadoop.io.compress.SnappyCodec;
...and using INSERT OVERWRITE to populate a table. Is there a way to confirm via the command line (similar to DESCRIBE EXTENDED) that output compression is enabled for a particular table?

Answer 1

When you exec describe formatted orc_with_compress_setting_table seeing something like this:
Compressed: No and feeling uncomfortable.
Here is the answer:
The Compressed field is not a reliable indicator of whether the table contains compressed data. It typically always shows No, because the compression settings only apply during the session that loads data and are not stored persistently with the table metadata.
from: https://www.cloudera.com/documentation/enterprise/5-5-x/topics/impala_describe.html

Answer 2

Following will show the path to the table files in hdfs
desc formatted <tablename>
hive> desc formatted cobtest;
OK
col_name data_type comment
col_name data_type comment
batch_sk int None
geo_cd string None
env_cd string None
Detailed Table Information
Database: default
Owner: steve
CreateTime: Thu Nov 21 23:36:37 PST 2013
LastAccessTime: UNKNOWN
Protect Mode: None
Retention: 0
Location: hdfs://localhost:9000/user/hive/warehouse/cobtest
Table Type: MANAGED_TABLE
Table Parameters:
numFiles 1
numPartitions 0
numRows 0
rawDataSize 0
totalSize 473
transient_lastDdlTime 1385105797
Storage Information
SerDe Library: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
InputFormat: org.apache.hadoop.mapred.TextInputFormat
OutputFormat: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat
Compressed: No
Num Buckets: -1
Bucket Columns: []
Sort Columns: []
Storage Desc Params:
field.delim \t
serialization.format \t
Time taken: 0.203 seconds, Fetched: 34 row(s)
You can then do dfs -lsr and you will notice by the file extensions if they are compressed.
hive> dfs -lsr hdfs://localhost:9000/user/hive/warehouse/cobtest ;
-rw-r--r-- 1 steve supergroup 473 2013-11-21 23:36 /user/hive/warehouse/cobtest/UDFPafCobIndTest.input**.tsv**
UPDATE SNAPPY is the CODEC for compression. You still need to add the following:
SET hive.exec.compress.output=true;
SET mapred.output.compression.codec=org.apache.hadoop.io.compress.SnappyCodec;
SET mapred.output.compression.type=BLOCK;