Hi Mayur, The reason why you see single file is, you have not enabled storing skewed columns/values as directories. You can do the following to enable storing the skewed columns and values as directories
set hive.mapred.supports.subdirectories=true; set mapred.input.dir.recursive=true; create tablet1(r1 string, r2 string) skewed by (r2) on (‘a’) stored as directories; This will enable you to store the skewed columns as directories below /user/hive/warehouse/t1/r2=a/000000_0 (skewed values go here) /user/hive/warehouse/t1/HIVE_DEFAULT_LIST_BUCKETING_DIR_NAME/000000_0 (all other values go here) With respect to your desc extended question where skewedColValueLocationMaps is empty, its a bug in implementation. I just verified that it shows empty for unpartitioned tables. But it shows correctly for partitioned tables. I have created a bug for unpartitioned tables here which you can track for progress on this issue https://issues.apache.org/jira/browse/HIVE-6968 Thanks Prasanth Jayachandran On Apr 23, 2014, at 6:52 AM, Mayur Gupta <mayur.gupt...@gmail.com> wrote: > Below is my skewedInfo > > skewedInfo:SkewedInfo(skewedColNames:[r2], skewedColValues:[[a]], > skewedColValueLocationMaps:{}) > > Any idea why is the skewedColValueLocationMaps empty? > > > On Mon, Apr 21, 2014 at 11:19 AM, Mayur Gupta <mayur.gupt...@gmail.com> wrote: > Hey There, > > I was trying to use Skewed tables but I am facing the issue that it is not > creating separate files for the skewed data. Even with a simple example I am > having the same issue. The hive version is 0.11. > > create table t(col1 string, col2 string); > load data local inpath '/home/hadoop/a.txt' into table t; > > create table t1(r1 string, r2 string) skewed by (r2) on ('a'); > insert into table t1 select * from t; > > The contents of a.txt are : > 1 ^Aa > 2^A b > 3 ^Ac > 4 ^Aa > 5 ^Ab > 6 ^Aa > > I see only single file. > > /user/hive/warehouse/t1/000000_0 > > Any pointers on what I am doing wrong? > -- CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You.
