Hi,
I presume you have read the percolator paper. The design there uses a
single ts oracle, and BigTable itself as the transaction manager. In omid,
they also have a TS oracle, but I do not know how scalable it is. But using
ZK as the TS oracle would not work, since ZK can scale up to 40-50K
I think having Int32, and NullableInt32 would support minimum overhead, as
well as allowing SQL semantics.
On Mon, Apr 1, 2013 at 7:26 PM, Nick Dimiduk ndimi...@gmail.com wrote:
Furthermore, is is more important to support null values than squeeze all
representations into minimum size
enjoyed the depth of explanation from both Enis and J-D. I was indeed
mistakenly referring to HFile as HLog, fortunately you were still able
understand my question.
Thanks,
Pankaj
On Mar 21, 2013, at 1:28 PM, Enis Söztutar enis@gmail.com wrote:
I think the page cache
From: Enis Söztutar [enis@gmail.com]
Sent: Monday, March 25, 2013 11:24 AM
To: hbase-user
Cc: lars hofhansl
Subject: Re: Does HBase RegionServer benefit from OS Page Cache
Thanks Liyin for sharing your use cases.
Related to those, I was thinking of two improvements:
- AFAIK, MySQL
Hi,
From the logs, it seems you are running into the same problem I have
reported last week: https://issues.apache.org/jira/browse/HBASE-8143
There are some mitigation strategies outlined in that jira. It would be
good if you can confirm:
- How many regions in the region server
- How many open
I would caution against going that route for various reasons:
- Correctness : You can never be sure to sync the memstore flushes and
compactions changing the files under you.
- Security: All files from HBase are owned by HBase user. Other
users should not be able to read it.
-
Hi,
HBase cannot deduce the row key structure, thus cannot pre split the table
unless it knows the basic format for the row keys.
shameless_self_plug you can look at the blog post about splits here:
http://hortonworks.com/blog/apache-hbase-region-splitting-and-merging//shameless_self_plug
Enis
I think the page cache is not totally useless, but as long as you can
control the GC, you should prefer the block cache. Some of the reasons of
the top of my head:
- In case of a cache hit, for OS cache, you have to go through the DN
layer (an RPC if ssr disabled), and do a kernel jump, and read
If you check out the latest source code, there are some examples under
hbase-examples/src/main/php.
Enis
On Thu, Mar 14, 2013 at 6:06 AM, dimpanagr dimpan...@yahoo.gr wrote:
Hi I have set up HBase and trying to use Thrift-Php to upload an image and
then display it. Is there any example or
Congrats and welcome.
On Mon, Mar 11, 2013 at 2:21 AM, Nicolas Liochon nkey...@gmail.com wrote:
Congrats, Anoop!
On Mon, Mar 11, 2013 at 5:35 AM, rajeshbabu chintaguntla
rajeshbabu.chintagun...@huawei.com wrote:
Contratulations Anoop!
There is a
MultiTableInputFormat that has been recently added to HBase. You might want
to take a look at it.
https://github.com/apache/hbase/blob/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/mapreduce/MultiTableInputFormat.java
Enis
On Wed, Feb 27, 2013 at 8:17 AM, Paul van Hoven
Hey,
You need to use both. If you setup the cluster through Apache Ambari (
http://incubator.apache.org/ambari/), it will setup everything for you.
Enis
On Tue, Feb 26, 2013 at 11:43 PM, Leonid Fedotov
lfedo...@hortonworks.comwrote:
Ganglia is monitoring and trending.
Nagios is health
Hi,
Maybe you can implement a SplitAlgorithm, and use the RegionSplitter
utility. You can find some information about the usage of SplitAlgorithm
here:
http://hortonworks.com/blog/apache-hbase-region-splitting-and-merging/
Enis
On Tue, Feb 19, 2013 at 11:11 PM, Farrokh Shahriari
From some of their presentations, I've gathered that they implement
B-Tree's instead of LSM's on top of their file system which allows random
writes. They also claim that they are converting random mutation requests
to the B-Tree leafs to sequential-writes. They are also talking about
mini-WALs to
Congrats. Well deserved.
Enis
On Thu, Feb 7, 2013 at 9:56 AM, Jimmy Xiang jxi...@cloudera.com wrote:
Congratulations!
On Thu, Feb 7, 2013 at 9:54 AM, Andrew Purtell apurt...@apache.org
wrote:
Congratulations Devaraj!
On Wed, Feb 6, 2013 at 9:19 PM, Ted Yu yuzhih...@gmail.com
Cool. Will play a bit later on. Was waiting for it to appear.
On Wed, Jan 30, 2013 at 1:04 PM, James Taylor jtay...@salesforce.comwrote:
We are pleased to announce the immediate availability of a new open source
project, Phoenix, a SQL layer over HBase that powers the HBase use cases at
Congrats.
Enis
On Wed, Jan 2, 2013 at 11:47 AM, Himanshu Vashishtha
hvash...@cs.ualberta.ca wrote:
Congrats Matteo and Chunhui! :)
On Wed, Jan 2, 2013 at 11:40 AM, Jimmy Xiang jxi...@cloudera.com wrote:
Congratulations! Matteo and Chunhui!!
On Wed, Jan 2, 2013 at 11:37 AM, Jonathan
I would still caution relying on the sorting order between values of the
same cf, qualifier and timestamp. If for example, there is a Delete, it
will eclipse subsequent Puts given the same timestamp, even though Put
happened after Delete.
Enis
On Mon, Aug 27, 2012 at 9:20 AM, Tom Brown
Interesting use case. For your product, do you also need to secure hbase as
well?
Enis
On Wed, Feb 22, 2012 at 10:03 AM, Alan Chaney a...@mechnicality.com wrote:
Hi
We are using Spring Security and HBase in our product. We are adding ACL
support through Spring and are looking at
Hey Andrew, any update on this. I am dying to see the blog posts : ). I can
also offer my relatively unworthy 2 cents, if you guys need any help.
Thanks,
Enis
On Wed, Feb 1, 2012 at 7:23 PM, Andrew Purtell apurt...@apache.org wrote:
Gary, Eugene is resurrecting posts on security now. I was
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