Hi there-
I commend your enthusiasm for the Hbase project. For the ground rules of
Hbase you probably want to read this closelyŠ
http://hbase.apache.org/book.html#datamodel
Š as it covers things like having one PK per table, no secondary indexes,
etc. With a solid understanding of these
Will do!
On 6/14/12 2:06 AM, Otis Gospodnetic otis_gospodne...@yahoo.com wrote:
JM, have a look at https://github.com/sematext/HBaseWD (this comes up
often Doug, maybe you could add it to the Ref Guide?)
Otis
Performance Monitoring for Solr / ElasticSearch / HBase -
Just wanted to point out that is also discussed under the autoFlush entry
in this chapter..
http://hbase.apache.org/book.html#perf.writing
.. but I think this could be better highlighted. I will fix it.
On 6/13/12 10:25 AM, Jean-Marc Spaggiari jean-m...@spaggiari.org wrote:
Hi N.
The
Hi there-
Your understanding is on track.
You probably want to read this section..
http://hbase.apache.org/book.html#regions.arch
Š as it covers those topics in more detail.
On 6/10/12 1:02 PM, Amit Sela am...@infolinks.com wrote:
Hi all,
I'm trying to better understand what's going on
Have you looked at any of the source code?
On 6/6/12 10:35 AM, S Ahmed sahmed1...@gmail.com wrote:
From what I understand each column family has its own file(s).
When hbase lookups a cell in a column family, how does it perform the
lookup? Is there an index on the file, or is it ordered?
Hi there, I think you probably want to look at thisŠ
Hbase catalog metadataŠ
http://hbase.apache.org/book.html#arch.catalog
How data is stored internallyŠ
http://hbase.apache.org/book.html#regions.arch
Lots of versioning description hereŠ
http://hbase.apache.org/book.html#datamodel
Long
Related to when does compaction actually occur?, although the original
question was about the web UI you might also want to see this...
http://hbase.apache.org/book.html#regions.arch
Š for an overview of the compaction file-selection algorithm.
On 6/2/12 8:42 AM, lars hofhansl
...@gmail.comwrote:
Thanks Doug, very instructive.
Do you have number to feel the gain using bulk loading
On May 24, 2012 4:18 PM, Doug Meil doug.m...@explorysmedical.com
wrote:
Hi folks-
The RefGuide was updated in a big way at the Hackathon yesterday. Two
things to note:
http
re: data from raw data file into hbase table
One approach is bulk loading..
http://hbase.apache.org/book.html#arch.bulk.load
If he's talking about using an Hbase table as the source of a MR job, then
see this...
http://hbase.apache.org/book.html#splitter
On 5/25/12 2:35 AM, Florin P
Hi there-
This tooŠ
http://hbase.apache.org/book.html#scan
Š you can do what you want by using the start/stop rows.
On 5/24/12 8:54 AM, Srikanth P. Shreenivas
srikanth_shreeni...@mindtree.com wrote:
Look at
http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/Scan.html#s
in the
RefGuide.
http://hbase.apache.org/book.html#hbck.in.depth
I ported a big writeup on hbck to the RefGuide appendix that Jon H. wrote.
Doug Meil
Chief Software Architect, Explorys
doug.m...@explorys.com
Also, 2 weeks ago the pseudo-distributed config and extras standalone web
page was moved and refactored into the Configuration chapter of the
RefGuide.
That came up in conversation yesterday at the hackathon and I wanted to
point that out.
On 5/24/12 9:17 AM, Doug Meil doug.m
)
for
use cases that need more complicated meta information.
2. If a region is removed from meta store, there exists a timing between
the time it is removed from meta store and that it is physically removed
from HDFS. That said, it is not reliable.
Chen
On Tue, May 15, 2012 at 10:06 PM, Doug Meil
You can get the Table-Region-StoreFile information via HDFS. That is
described here in the RefGuide:
http://hbase.apache.org/book.html#trouble.namenode
On 5/15/12 5:09 PM, Chen Song chen.song...@gmail.com wrote:
I am new to HBase and started working on a project which needs meta
information is within HBase world.
Thanks
Chen
On Tue, May 15, 2012 at 5:23 PM, Doug Meil
doug.m...@explorysmedical.comwrote:
You can get the Table-Region-StoreFile information via HDFS. That is
described here in the RefGuide:
http://hbase.apache.org/book.html#trouble.namenode
On 5/15/12 5:09
For the record, what Andrew/Li said is pretty much the standard disclaimer
in the Performance chapter for EC2. It's a separate class of performance
problem.
http://hbase.apache.org/book.html#perf.ec2
On 5/15/12 8:04 PM, Andrew Purtell apurt...@apache.org wrote:
It's not just a matter of
I'll update the RefGuide with this. This is a good thing for everybody to
know.
On 5/9/12 5:08 PM, Jean-Daniel Cryans jdcry...@apache.org wrote:
Just alter the families, the old store files will get converted during
compaction later on.
J-D
On Wed, May 9, 2012 at 2:06 PM, Otis
Also, there is multi-Get support as of 0.90.x to further optimize the RPC
calls if you need to make a bunch of calls.
On 5/9/12 4:47 PM, Jean-Daniel Cryans jdcry...@apache.org wrote:
What Bryan said, also Scan(Get) is used internally in the region
server code so that's probably why that
Once a StoreFile is written to disk it is never updated.
http://hbase.apache.org/book.html#regions.arch
So the options are are either Puts (like you've been describing - which
will create new StoreFiles per MemStore flush) or bulk loading HFiles (new
StoreFiles).
Out of curiosity, are you
You're right, it's not currently a metric.
But there is an entry for the disk usage here...
http://hbase.apache.org/book.html#trouble.namenode
On 5/6/12 10:41 PM, Otis Gospodnetic otis_gospodne...@yahoo.com wrote:
Hello,
Does HBase know how much space it is occupying on HDFS?
I looked at
One thing you might want to watch out for is that if you are starting with
421 regions on the source but the dest table isn't pre-split then it's
going to try to slam all the data into one region and then have to split
(and split and split, etc.).
http://hbase.apache.org/book.html#perf.writing
Harsh pretty much summed it up already (e.g., don't do that) but below
is some further reading of what just happened...
http://hbase.apache.org/book.html#arch.catalog
http://hbase.apache.org/book.html#trouble.namenode
... META is just an HBase table under the covers. By deleting the table on
it was ok to
delete everything... In your case, you may have to figure out how to
export
some data first, as I don't know exactly what effect deleting that temp
directory will have)
Good luck!
--Tom
On Monday, May 7, 2012, Doug Meil wrote:
Harsh pretty much summed it up already (e.g
with no data ?
On 7 May 2012 22:19, Doug Meil doug.m...@explorysmedical.com wrote:
Because you did this... hadoop fs -rmr /hbase/cjjWaitHash
... your data is gone.
Per...
http://hbase.apache.org/book.html#trouble.namenode
... that's where StoreFiles are kept for that particular table.
On 5/7
a JIRA issue for this?
Thanks,
Otis
Performance Monitoring for Solr / ElasticSearch / HBase -
http://sematext.com/spm
From: Doug Meil doug.m...@explorysmedical.com
To: user@hbase.apache.org user@hbase.apache.org; Otis Gospodnetic
otis_gospodne...@yahoo.com
re: with lackluster performance for random reads
You want to be on CDH3u3 for sure if you want to boost random read
performance.
On 5/2/12 5:29 PM, Paul Mackles pmack...@adobe.com wrote:
I think the answer to this is no, but I am hoping someone with more
experience can confirm thisŠ we are
Hi there, as a sanity check with respect to writing have you
double-checked this section of the RefGuide..
http://hbase.apache.org/book.html#perf.writing
... regarding pre-created regions and monotonically increasing keys?
Also as a sanity check refer to this case study as a diagnostic
There is also a description of the compaction file-selection algorithm in
here...
http://hbase.apache.org/book.html#regions.arch
(section 8.7.5.5)
On 4/26/12 5:28 PM, Robby robby.verkuy...@gmail.com wrote:
Yes, as per Lars' book: Minor compactions can be promoted to major
compactions if
Hi there-
In addition to what was said about GC, you might want to double-check
this...
http://hbase.apache.org/book.html#performance
... as well as this case-study for performance troubleshooting
http://hbase.apache.org/book.html#casestudies.perftroub
On 4/24/12 9:58 PM, Michael Segel
This would be a good entry for the new Use Cases chapter in the Schema
Design section.
On 4/18/12 1:02 AM, lars hofhansl lhofha...@yahoo.com wrote:
I disagree. This comes up frequently and some basic guidelines should be
documented in the Reference Guide.
If it is indeed not difficult than
Hi there-
Because your topic is webcrawling, you might want to read the BigTable
paper because the example in that paper is about webcrawling.
You can find that, and other info, in the RefGuide...
http://hbase.apache.org/book.html#other.info.papers
On 4/18/12 2:08 PM, petri koski
Hi there-
Have you seen the chapter on MR in the RefGuide?
http://hbase.apache.org/book.html#mapreduce.example
You use the Result instance just like you would from a client program.
On 4/17/12 6:07 AM, Ram rumshe...@gmail.com wrote:
have a table called User with two columns ,one called
Hi there-
With respect to:
* Does it need to hit every memstore and HFile to determine if there
isdata available? And if so does it need to do a full scan of that file to
determine the records qualifying to the timerange, since keys are stored
lexicographically?
And...
Using scan 'table',
.
This work is done in StoreScanner#selectScannersFrom
Cheers,
N.
On Sat, Apr 14, 2012 at 5:11 PM, Doug Meil
doug.m...@explorysmedical.comwrote:
Hi there-
With respect to:
* Does it need to hit every memstore and HFile to determine if there
isdata available? And if so does it need to do a full
Hi there-
Especially with respect to the caching, HBase has a block cache so I think
it would be a good idea to review the architecture chapter
http://hbase.apache.org/book.html#architecture
On 4/13/12 3:45 AM, Bing Li lbl...@gmail.com wrote:
NNever,
Thanks so much for your answers!
Looks good. Thanks stack!
On 4/13/12 2:47 PM, Stack st...@duboce.net wrote:
On Fri, Apr 13, 2012 at 5:05 AM, Doug Meil
doug.m...@explorysmedical.com wrote:
Stack was still working on the site as of the end of day yesterday...
Sorry about that. Our site needed a bit of updating
re: Is HBase thread-safety?
HTable instances are not thread safe, though.
http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/HTable.html
On 4/12/12 6:10 PM, Bing Li lbl...@gmail.com wrote:
Dear all,
Is HBase thread-safety? Do I need to consider the consistency issue when
.
with the default behavior only two nodes will work for a map/reduce
task., isn't it ?
if i do a custom input that split the table by 100 rows, can i
distribute manually each part on a node regardless where the data
is ?
Le 5 avril 2012 00:36, Doug Meil doug.m...@explorysmedical.com a écrit :
The default
Hi there-
See...
http://hbase.apache.org/book.html#developer
On 4/4/12 8:02 AM, Asmi smita.j...@gmail.com wrote:
Hi,
May I know is there any book just like you
suggested for HBase to make the changes.
Asmi.
Hi there, you probably want to see this..
http://hbase.apache.org/book.html#splitter
... as well as this...
http://hbase.apache.org/book.html#regions.arch.locality
... as the latter describes data locality.
On 4/4/12 7:41 AM, sdnetwork sdnetw...@gmail.com wrote:
Hello,
I started
The default behavior is that the input splits are where the data is stored.
On 4/4/12 5:24 PM, sdnetwork sdnetw...@gmail.com wrote:
ok thanks,
but i don't find the information that tell me how the result of the split
is
distrubuted across the different node of the cluster ?
1) randomely ?
See the link to the BigTable paper here...
http://hbase.apache.org/book.html#other.info
... and there is other reading material and videos too.
On 4/1/12 11:30 PM, Mahdi Negahi negahi.ma...@hotmail.com wrote:
thanks, but all databases have good examples , like Cinema in Neo4j and
etc.
but
Also, see this chapter.
http://hbase.apache.org/book.html#schema
On 4/2/12 11:40 AM, Doug Meil doug.m...@explorysmedical.com wrote:
See the link to the BigTable paper here...
http://hbase.apache.org/book.html#other.info
... and there is other reading material and videos too.
On 4/1
HBaseCon is also on the home page...
http://hbase.apache.org/
On 4/2/12 3:18 PM, Lars George lars.geo...@gmail.com wrote:
http://www.hbasecon.com/
On Apr 2, 2012, at 10:16 PM, Marcos Ortiz wrote:
I heard yesterday that the first conference dedicated to HBase will be
in the next days.
Just as a quick reminder regarding what Todd mentioned, that's exactly
what was happening in this case study...
http://hbase.apache.org/book.html#casestudies.slownode
... although it doesn't appear to be the problem in this particular
situation.
On 3/29/12 8:22 PM, Juhani Connolly
Speculative execution is on by default in Hadoop. One of the Performance
recommendations in the Hbase RefGuide is to turn it off.
On 3/30/12 6:12 PM, Jean-Daniel Cryans jdcry...@apache.org wrote:
Well that's not an HBase configuration, that's Hadoop. I'm not sure if
this is listed
Hi folks-
The HBase RefGuide has been updated on the website.
Doug Meil
Chief Software Architect, Explorys
doug.m...@explorys.com
each of those links
is a separate study in this new chapter.
From: Doug Meil
doug.m...@explorysmedical.commailto:doug.m...@explorysmedical.com
Date: Wed, 28 Mar 2012 17:50:01 -0400
To: user@hbase.apache.orgmailto:user@hbase.apache.org
user@hbase.apache.orgmailto:user@hbase.apache.org
Subject
Speculative execution is on by default.
http://hbase.apache.org/book.html#mapreduce.specex
On 3/23/12 8:04 AM, Peter Wolf opus...@gmail.com wrote:
Hi Michel,
I agree it doesn't make sense, but then I believe we are tracking a bug.
I don't know about speculative execution, but I certainly
re: However, I am getting different number of results, depending on
which families are added
Yes.
I'd suggest you read this in the RefGuide.
http://hbase.apache.org/book.html#datamodel
On 3/15/12 12:08 PM, Peter Wolf opus...@gmail.com wrote:
Hi all,
I am doing a scan on a table with
Scans are also described in the RefGuide here...
http://hbase.apache.org/book.html#data_model_operations
On 3/14/12 2:22 AM, Akbar Gadhiya akbar.gadh...@gmail.com wrote:
Hi,
You can perform scan this way,
scan 'tablename', {STARTROW='name + start time stamp', ENDROW='name +
end
time
Hi there-
You probably want to see this in the RefGuide...
http://hbase.apache.org/book.html#schema
On 3/14/12 9:47 PM, 韶隆吴 yechen1...@gmail.com wrote:
Hi all:
I'm trying to import data from oracle to hbase and now I have a
problem.
In some tables,there have more than one primary
Hi there-
You probably want to see this...
http://hbase.apache.org/book.html#dm.column.metadata
You can get the CF's from HTableDescriptor.
http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/HTableDescriptor.ht
ml
On 3/12/12 10:10 AM, Mahdi Negahi negahi.ma...@hotmail.com wrote:
If you're using Cloudera, you want to be on CDH3u3 because it has several
HDFS performance fixes for low-latency reads.
That still doesn't address your 23:00-hour perf issue, but that's
something that will help.
On 3/11/12 3:39 PM, Антон Лыска ant...@wildec.com wrote:
Hi guys!
I have a
Hi there-
Have you seen the examples in here?
http://hbase.apache.org/book.html#mapreduce
On 3/11/12 4:59 PM, Weishung Chung weish...@gmail.com wrote:
Hey users,
I am trying to store mapreduce output directly to HBase. Basically I have
a
regular mapper reading from files and would like
Hi there-
There is a chapter in the Hbase RefGuide on the Hbase data model that
might be helpful.
http://hbase.apache.org/book.html#datamodel
On 3/10/12 1:30 AM, newbie24 shripri...@hotmail.com wrote:
Thanks Harsh..little confused ..want to clarify some more
the row key i have is a
Hi there-
Here are the recommendations from the HBase RefGuide:
http://hbase.apache.org/book.html#perf.os
... and they are consistently with what the book says (recommends 64-bit
OS and more memory).
Also, keep this in mind...
http://hbase.apache.org/book.html#arch.overview
... the
I believe that's covered here...
http://hbase.apache.org/book.html#arch.catalog
Notes on HRegionInfo: the empty key is used to denote table start and
table end. A region with an empty start key
is the first region in a table. If region has both an empty start
and an empty end key, its
Hi there-
You might want to see this in the Ref Guide.
http://hbase.apache.org/book.html#arch.catalog
A region with an empty start key
is the first region in a table. If region has both an empty start
and an empty end key, its the only region in the table
On 3/5/12 7:27 AM, yonghu
re: Almost every blog I read about HBase tells me it's a clone of
BigTable.
The HBase website says that too
http://hbase.apache.org/
re: Almost every blog I've read about HBase also tells me to
use a lot of RAM
So does the Hbase Reference Guide...
This doesn't address your question on move(), but regarding locality, see
8.7.3 in here...
http://hbase.apache.org/book.html#regions.arch
.. it's not just major compactions, but any write of a storefile that
affects locality (flush, minor, major).
On 3/5/12 11:02 AM, Bryan Beaudreault
Agree with what Michael says.
Here is the section from the RefGuide on this topic...
http://hbase.apache.org/book.html#supported.datatypes
... it's yes you can, as long as you aren't storing 'huge' things
On 3/4/12 12:24 PM, Michael Segel michael_se...@hotmail.com wrote:
It depends on your
Hi there-
You probably want to read this in the Ref Guide...
http://hbase.apache.org/book.html#jvm
On 3/3/12 8:05 AM, Ferdy Galema ferdy.gal...@kalooga.com wrote:
Hi,
I'm running regionservers with 2GB heap and following tuning options:
-XX:+UseConcMarkSweepGC -XX:+UseParNewGC
Hi there folks-
The HBase Reference Guide has been updated.
One new entry I'd like to point out is a troubleshooting case study…
http://hbase.apache.org/book.html#trouble.casestudy
… to serve as a blueprint on how to do cluster diagnosis.
Doug Meil
Chief Software Architect, Explorys
doug.m
Also this...
http://hbase.apache.org/book.html#perf.schema
(which also has a link to the block cache link that JD cited below)
On 3/2/12 2:12 PM, Jean-Daniel Cryans jdcry...@apache.org wrote:
It's just a priority in the block cache, read more at:
6 tables with 1 CF apiece is a perfectly reasonable approach, particularly
if the data is to be processed separately.
If the data is all to be processed at the same time (e.g., regularly all
in one MR job) then you might want to consider a single table with a 1 CF
and heterogenous rows.
On
Hi there-
Take a look at this section of the book...
http://hbase.apache.org/book.html#reverse.timestamp
On 3/2/12 4:02 PM, Peter Wolf opus...@gmail.com wrote:
Hello all,
I want to retrieve the most recent N rows from a table, with some column
qualifiers.
I can't find a Filter, or
Reference Guide, I mean. Not Book. Reference Guide.
:-)
On 3/2/12 4:31 PM, Doug Meil doug.m...@explorysmedical.com wrote:
Hi there-
Take a look at this section of the book...
http://hbase.apache.org/book.html#reverse.timestamp
On 3/2/12 4:02 PM, Peter Wolf opus...@gmail.com wrote
with result...
}
Do I have to worry about efficiency? Is the Server madly retrieving
rows, in the background, that the Client will never use?
Thanks
P
On 3/2/12 4:31 PM, Doug Meil wrote:
Hi there-
Take a look at this section of the book...
http://hbase.apache.org/book.html#reverse.timestamp
Yes, you can do MR against standalone Hbase (it uses the LocalJobRunner
just like stand-alone Hadoop).
I'd focus on this error...
12/03/02 21:42:13 ERROR zookeeper.ZKConfig: no clientPort found in
zoo.cfg
On 3/2/12 6:14 PM, T Vinod Gupta tvi...@readypulse.com wrote:
hi,
im wondering if
You probably want to see this...
http://hbase.apache.org/book.html#splitter
On 2/29/12 7:48 PM, Vrushali C vrush...@ymail.com wrote:
I am using TableMapReduceUtil.initTableMapperJob to initiate a map reduce
job that scans the entire table and processes records in it.
I wanted to know
For a simple use case I'd read the BigTable paper.
http://research.google.com/archive/bigtable.html
On 2/26/12 1:24 AM, Srinivas Reddy hbaselearn...@gmail.com wrote:
Hi All,
I have good experience on Hadoop administration, Pig , Hive and Sqoop.
Interested in learning HBase
re: Coming from a RDBMS background, I am thinking there has to be a set
of
files under hbase.
You're correct, there are. For more info on that structure, see...
http://hbase.apache.org/book.html#regions.arch
On 2/24/12 5:45 AM, Admin Absoftinc absoft...@gmail.com wrote:
I have a up and
You probably want to start with reading about the StoreFiles and how Hbase
stores data internally.
http://hbase.apache.org/book.html#regions.arch
On 2/22/12 4:09 AM, Bing Li lbl...@gmail.com wrote:
Dear all,
I wonder how data in HBase is indexed? Now Solr is used in my system
because data
Hi there-
You probably want to see this...
http://hbase.apache.org/book.html#perf.deleting
.. that particular method doesn't use the write-buffer and is submitting
deletes one-by-one to the RS's.
On 2/21/12 3:52 PM, Haijia Zhou leons...@gmail.com wrote:
Hi, All
I'm new to this email list
.
On 2/21/12 7:39 PM, Stack st...@duboce.net wrote:
On Tue, Feb 21, 2012 at 2:45 PM, Doug Meil
doug.m...@explorysmedical.com wrote:
Hi there-
You probably want to see this...
http://hbase.apache.org/book.html#perf.deleting
.. that particular method doesn't use the write-buffer
Bryan, if you're on 0.90.x the advice is to not go above 4gb regions. The
Hfilev2 format is in 0.92 which better supports larger regions.
On 2/18/12 5:31 PM, Mikael Sitruk mikael.sit...@gmail.com wrote:
Hi Bryan
The size is the size of the store file, if the size go above this you will
Good stuff Nicholas, I'll add this to the book.
On 2/16/12 3:52 PM, Nicolas Spiegelberg nspiegelb...@fb.com wrote:
Bryan,
Currently, ROW ROWCOL Bloom Filters are only checked for explicit,
single-row 'Get' scans. ROWCOL BFs are only checked when you're querying
for explicit column
requested rowKey? Is it by linear search or binary search or any other
algorithm? Or for every row in that region, is there any hash value stored
and hash lookup takes place to get that rowKey's value? what happens
really within that region?
On Mon, Feb 13, 2012 at 7:35 PM, Doug Meil
doug.m
I say basically because inside a Region there are Stores, and for each
Store there are StoreFiles. For more info see:
http://hbase.apache.org/book.html#regions.arch
On 2/14/12 11:06 AM, Doug Meil doug.m...@explorysmedical.com wrote:
Keys are stored in sorted order, it's basically
Also see here...
http://hbase.apache.org/book.html#keyvalue
Compression will make it better on disk, but it will inflate over the wire.
On 2/14/12 12:40 PM, Jean-Daniel Cryans jdcry...@apache.org wrote:
We are assuming the longer cf/qual would be written to HDFS billions of
times and
To stress what JD just said, the HBase book/Ref Guide (i.e., the online
book that is a part of HBase) is open source and the best source of the
material (especially the Troubleshooting chapter) is user experience.
Minor clarification: HBase the Definitive Guide is a great book by
O'Reilly, but
re: Now if that RegionServer has multiple
regions on it, how does the request get transfered to a correct region
which has the requested rowKey?
See...
http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/HTable.html#
getRegionLocation%28byte[],%20boolean%29
As described in
around in books... but didn't find, maybe something to do with
CatalogJanitor?)
Thx,
Eric
On 11/02/12 20:12, Doug Meil wrote:
Regarding the master being down, just be aware that if you lose an RS
that
you'll have issues because the master is what does the reassignment.
Per
the previous comments
Regarding the master being down, just be aware that if you lose an RS that
you'll have issues because the master is what does the reassignment. Per
the previous comments, at steady-state HBase can run without the master -
there's an asterisk.
On 2/11/12 11:31 AM, Eric Charles e...@apache.org
Also, there is a description of what is in META and ROOT in here...
http://hbase.apache.org/book.html#arch.catalog
... and it also describes the startup sequencing.
On 2/10/12 10:46 AM, Harsh J ha...@cloudera.com wrote:
The client does communicate with the master to perform .META.
for coprocessors was created in Arch/RegionServer has been
added, pointing to the great blog entry on the subject. Eventually this can be
merged to the book, but at least there's a link to it now.
Doug Meil
Chief Software Architect, Explorys
doug.m...@explorys.com
Yep! You got it.
Don't forget to always close the ResultScanner
http://hbase.apache.org/book.html#data_model_operations
On 2/9/12 6:35 AM, Listas Discussões lis...@arianpasquali.com wrote:
I've just realized how to do it
there is no need to specify column at the scan.
here is the
Hi there-
In addition to what Stack said, you probably want to review these:
http://hbase.apache.org/book.html#mapreduce
http://hbase.apache.org/book.html#performance
On 2/8/12 10:51 AM, Stack st...@duboce.net wrote:
On Wed, Feb 8, 2012 at 3:15 AM, Vladi Feigin vladi.fei...@nice.com
wrote:
Hi there-
You probably want to check out these chapters of the Hbase ref guide:
http://hbase.apache.org/book.html#datamodel
http://hbase.apache.org/book.html#schema
http://hbase.apache.org/book.html#mapreduce
... and with respect to the 40 minutes per report, a common pattern is
to create
... but it depends on what you want to do. If you want full-text
searching, then yes, you probably want to look at Lucene. If you want
activity analysis, summaries are probably better.
On 2/5/12 1:54 PM, Doug Meil doug.m...@explorysmedical.com wrote:
Hi there-
You probably want to check
I'll make sure the book links to this.
On 2/1/12 3:26 AM, Mingjie Lai m...@apache.org wrote:
Hi hbasers.
A hbase blog regarding coprocessors has been posted to apache blog site.
Here is the link:
https://blogs.apache.org/hbase/entry/coprocessor_introduction
Your comments are welcome.
Hi there-
These perf-tests on small clusters are fairly common questions on the
dist-list, but it needs to be stressed that Hbase (and HDFS) doesn't begin
to stretch it's legs until about 5 nodes.
http://hbase.apache.org/book.html#arch.overview
On 2/1/12 7:51 AM, Tim Robertson
In addition, see...
http://hbase.apache.org/book.html#mapreduce.example
On 1/28/12 6:43 AM, Ioan Eugen Stan stan.ieu...@gmail.com wrote:
2012/1/28 Vamshi Krishna vamshi2...@gmail.com:
Hi, here i am trying to read rows from a table, and put them to a file
as
it is.For that my mapper class
Hi there-
Quick sanity check: what caching level are you using? (default is 1) I
know this is basic, but it's always good to double-check.
If language is already in the lead position of the rowkey, why use the
filter?
As for EC2, that's a wildcard.
On 1/25/12 7:56 AM, Peter Wolf
It's back up. Never mind.
On 1/25/12 10:33 AM, Doug Meil doug.m...@explorysmedical.com wrote:
Not only is the hbase website down, but apache.org appears to be down.
http://www.downforeveryoneorjustme.com/hbase.apache.org
http://www.downforeveryoneorjustme.com/www.apache.org
Doug Meil
;-)
Adding the following speeded things up quite a bit
scan.setCacheBlocks(true);
scan.setCaching(1000);
Thank you, it was a duh!
P
On 1/25/12 8:13 AM, Doug Meil wrote:
Hi there-
Quick sanity check: what caching level are you using? (default is 1)
I
know this is basic, but it's
Because you specifically cited the medical domain in your question, I
think you might want talk to Explorys (disclaimer: I work there).
Otherwise, you probably want to look at the HBase book.
On 1/25/12 11:30 AM, Dalia Sobhy dalia.mohso...@hotmail.com wrote:
So what about HBQL??
And if i
scan.setCacheBlocks(true);
scan.setCaching(1000);
Thank you, it was a duh!
P
On 1/25/12 8:13 AM, Doug Meil wrote:
Hi there-
Quick sanity check: what caching level are you using? (default is
1) I
know this is basic, but it's always good to double-check.
If language is already
Hi there-
As someone who works with medical data I take such analysis very
seriously, but according to the World Health Organization there were 608
cases of measles reported in Egypt in 2011 (page 82). Granted, these are
probably incidence and not prevalence statistics, but the order of
101 - 200 of 399 matches
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