Got it.
Thanks for your reply.
Zhiwen Sun
On Wed, Dec 23, 2015 at 2:24 PM, Gopal Vijayaraghavan
wrote:
>
> > But why disable mapjoin has better performance when we don't use cast to
> >string(user always lazy)?
> >
> > Join key values comparison in in reduc
Thanks to Gopal.
But why disable mapjoin has better performance when we don't use cast to
string(user always lazy)?
Join key values comparison in in reduce stage is more quickly?
Zhiwen Sun
p;9456
On Wed, Dec 23, 2015 at 2:36 AM, Gopal Vijayaraghavan
wrote:
>
> > We found tha
a.id
and b.id to double. When the conversion occurs, map join will become very
slow.
Simple solution is disable autojoin.
Does anyone how to solve it more effectively?
My hive version : 1.1.0+cdh5.4.7+233
Zhiwen Sun
The folder "/mnt/hadoop-fs/dfs/data/current/" is the main folder of
datanode in hadoop.
You can use *hadoop dfs -rmr {nouserdir} *to get more free space in HDFS.
*Don't delete file directly in OS file system.*
Zhiwen Sun
On Mon, Mar 18, 2013 at 6:48 PM, Manish Bhoge wrote:
As u defined in create table hql: fields delimited by blank space. So, the
other data is omitted
if you wanna contain rest data at the end of line. I suggest you use
org.apache.hadoop.hive.contrib.serde2.RegexSerDe row format instead of
default delimited format.
Zhiwen Sun
On Mon, Mar 11
