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From Jonathan Gray <jg...@facebook.com>
Subject RE: EC2 + Thrift inserts
Date Thu, 29 Apr 2010 02:32:49 GMT
Hey Chris,

That's a really significant slowdown.  I can't think of anything obvious that would cause
that in your setup.

Any chance of some regionserver and master logs from the time it was going slow?  Is there
any activity in the logs of the regionservers hosting the regions of the table being written


> -----Original Message-----
> From: Christopher Tarnas [mailto:cft@tarnas.org] On Behalf Of Chris
> Tarnas
> Sent: Wednesday, April 28, 2010 6:27 PM
> To: hbase-user@hadoop.apache.org
> Subject: EC2 + Thrift inserts
> Hello all,
> First, thanks to all the HBase developers for producing this, it's a
> great project and I'm glad to be able to use it.
> I'm looking for some help and hints here with insert performance help.
> I'm doing some benchmarking, testing how I can scale up using HBase,
> not really looking at raw speed. The testing is happening on EC2, using
> Andrew's scripts (thanks - those were very helpful) to set them up and
> with a slightly customized version of the default AMIs (added my
> application modules). I'm using HBase 20.3 and Hadoop 20.1. I've looked
> at the tips in the Wiki and it looks like Andrew's scripts are already
> setup that way.
> I'm inserting into HBase from a hadoop streaming job that runs perl and
> uses the thrift gateway. I'm also using the Transactional tables so
> that alone could be the case, but from what I can tell I don't think
> so. LZO compression is also enabled for the column families (much of
> the data is highly compressible). My cluster has 7 nodes, 5
> regionservers, 1 master and 1 zookeeper. The regionservers and master
> are c1.xlarges. Each regionserver has the tasktrackers that runs the
> hadoop streaming jobs, and regionserver also runs its own thrift
> server. Each mapper that does the load talks to the localhost's thrift
> server.
> The Row keys a fixed string + an incremental number then the order of
> the bytes are reversed, so runA123 becomes 321Anur. I though of using
> murmur hash but was worried about collisions.
> As I add more insert jobs, each jobs throughput goes down. Way down. I
> went from about 200 row/sec/table per job with one job to about 24
> rows/sec/table per job with 25 running jobs. The servers are mostly
> idle. I'm loading into two tables, one has several indexes and I'm
> loading into three column families, the other has no indexes and one
> column family. Both tables only currently have two region each.
> The regionserver that serves the indexed table's regions is using the
> most CPU but is 87% idle. The other servers are all at ~90% idle. There
> is no IO wait. the perl processes are barely ticking over. Java on the
> most "loaded" server is using about 50-60% of one CPU.
> Normally when I do load in a pseudo-distrbuted hbase (my development
> platform) perl's speed is the limiting factor and uses about 85% of a
> CPU. In this cluster they are using only 5-10% of a CPU as they are all
> waiting on thrift (hbase). When I run only 1 process on the cluster,
> perl uses much more of a CPU, maybe 70%.
> Any tips or help in getting the speed/scalability up would be great.
> Please let me know if you need any other info.
> As I send this - it looks like the main table has split again and is
> being served by three regionservers.. My performance is going up a bit
> (now 35 rows/sec/table per processes), but still seems like I'm not
> using the full potential of even the limited EC2 system, no IO wait and
> lots of idle CPU.
> many thanks
> -chris

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