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

Switch to Threaded View
HBase, mail # user - Why HBase integation with Hive makes Hive slow


Copy link to this message
-
Why HBase integation with Hive makes Hive slow
Hao Ren 2013-08-01, 14:45
Hi,

I have a cluster (1 master + 3 slaves) on which there Hive, Hbase, and
Hadoop.

In order to do some daily row-level update routine, we need to integrate
Hbase with hive, but the performance is not good.

E.g. There are 2 tables in hive,
     hbase_table:  a hbase table created via Hive
     hive_table: a native hive table
  both hold the same data set.

When runing:
     select count(*) from hbase_table; ===> takes 500 s
     select count(*) from hive_table; ===> takes 6 s

I have tried a lot of queries on the two tables. But hbase_table is
always very slow.

To be claire, I created the hbase_ table as below:

CREATE TABLE hbase_table (
idvisite string,
client_list Array<string>,
nb_client int)
STORED BY 'org.apache.hadoop.hive.hbase.HBaseStorageHandler'
WITH SERDEPROPERTIES ("hbase.columns.mapping" =
":key,clients:id_list,clients:nb")
TBLPROPERTIES("hbase.table.name" = "table_test")
;

And my Hbase is on pseudo-distributed mode.

I guess, at the beginning of a hive query execution, hive will load data
from Hbase, where serde takes a long time.

Could someone tell me how to improve my poor performance ?
Is this cause by my wrongly configured integration ?
Is a fully-distributed mode needed here ?

Thank you in advance for your time.

Hao.
--
Hao Ren
ClaraVista
www.claravista.fr