[Gluster-users] gluster map/reduce performance..
venky at gluster.com
Wed Oct 19 16:34:33 UTC 2011
Appreciate if you could share the following info with us:
* Are you using GlusterFS hadoop plugin (which is here http://download.gluster.com/pub/gluster/glusterfs/qa-releases/3.3-beta-2/glusterfs-hadoop-0.20.2-0.1.x86_64.rpm and is still in beta) or are you using GlusterFS as an additional layer below Hadoop's FileSystem (HDFS) ?
The latter is basically configuring Hadoop to use GlusterFS mount point (e.g. FUSE mount) as the data directory for Hadoop's DFS.
Let us know your setup (including GlusterFS version) to debug further.
From: gluster-users-bounces at gluster.org [gluster-users-bounces at gluster.org] on behalf of andrew [sstrato.kong at gmail.com]
Sent: Wednesday, October 19, 2011 6:15 PM
To: gluster-users at gluster.org
Subject: [Gluster-users] gluster map/reduce performance..
i try to check the performance of Map/Reduce of Gluster File system.
Mapper side speed is quite good and it is sometimes faster than hadoop's map job.
But in the Reduce Side job is much slower than hadoop.
i analyze the result and i found the primary reason of slow speed is bad performance in Merging stage.
Would you have any suggestion for this issue
FYI check the blog http://storage4com.blogspot.com/
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