Grokbase Groups HBase dev June 2010
Non-PMC +1 from me too. I've been running on a 5 node cluster for several
hours under heavy load (three machines running YCSB with 40 threads).
Everything holding up pretty well.

Thanks for the note on read performance, definitely something to look into
for the next dev release in case we have a big regression.

Given we have 3 PMC +1s above, I think we're technically good to release.
Let's figure that out on IRC (I don't know the process involving web site,

On Thu, Jun 24, 2010 at 2:48 PM, Jean-Daniel Cryans wrote:

I tried it on 1 machine with a RS configured with 500MB heap and it
was holding fine. Also tried with 5GB, in both cases I was very
impressed with the import speed (peaking at 90k/sec on 1 RS but lots
of pauses due to full memstores).

But then I tried doing a randomRead test with 10 clients... I got only
max 200 req/sec and it was driving my system's load to 12 (almost
exclusively IO wait). Looking at the jstacks of both RS and DN, the
threads are all waiting in the selectors. I don't remember seeing this
with 0.20.5 on the same machine.

Still, since this is a dev release, I'm +1

On Thu, Jun 24, 2010 at 8:21 AM, Todd Lipcon wrote:
I've built src and binary releases from the tip of branch 0.89.20100621.
I've also made a new tag for this release candidate, rc1. You can find the
tarballs at:

MD5 sums:

5c4281c2cab6c686dc9f2d1e2b624d53 hbase-0.89.20100621-bin.tar.gz
8a581e0dc2176e83a2c0c05da2456535 hbase-0.89.20100621-src.tar.gz

GPG signatures are in the same directory.

I would like to propose releasing this release candidate as HBase

Changes since last release candidate:
HBASE-2774 Spin in ReadWriteConsistencyControl eating CPU (load > 40)
no progress running YCSB on clean cluster start
HBASE-2783 Quick edit of 'Getting Started' for development release

Please see the previous thread for more information about the purpose of
this release candidate - in particular, we're not making any guarantees that
this is bug free. I hope we can release this rc with no follow up patches
unless anything is extremely broken. We'll do another release like this in a
few weeks after the new master code has been stabilized a bit, and of course
anything else that has gone into trunk will go into there.

If we could complete voting by Friday that would be excellent.


Todd Lipcon
Software Engineer, Cloudera

Todd Lipcon
Software Engineer, Cloudera

Todd Lipcon
Software Engineer, Cloudera

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groupdev @
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postedJun 24, '10 at 3:22p
activeJun 25, '10 at 4:56p



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