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

Switch to Threaded View
HBase, mail # user - number of zookeeper connections, how many is too many?


Copy link to this message
-
number of zookeeper connections, how many is too many?
kaveh minooie 2013-04-22, 22:58
Hi

I was just wondering if what I am seeing in my cluster makes sense. I
have a hadoop cluster with 10 nodes and I am running 10 regionserver on
top them as well. in my zoo keeper configuration I choose to allow
unlimited number of connection mostly to see how high it actually goes.
now, I run 8 map task on each of my node to a total of 80 concurrent map
tasks, and my hbase regionservers each have a bit short of 200 regions
on each server for a total of 1838 (or something) all belonging to only
one table.

right after bringing up the hbase or when no mapreduce (or anyother
client )is using the hbase the number of connection is always 23. when i
run a mapreduce job that basically goes over the entire talbe ( has 1800
something map tasks). I see ( in the zk_dump on hbase master web
interface ) that the number of connections goes up to about 390ish.

I am new to this, so my main question is first does this makes sense? or
am i doing something wrong? cause I don't understand why each region
server has to establish more than one connection.

thanks,