Hi there, you probably want to start with this first.
http://hbase.apache.org/book.html#client
On 7/18/11 2:16 AM, aadish kotwal.aad...@gmail.com wrote:
Hey people,
I am very new to HBase, and I would like if someone gave me guidance
regarding connection pooling.
Thanks a lot, in
Hi there-
Read this for starters...
http://hbase.apache.org/book.html
On 7/18/11 10:24 AM, shanmuganathan.r shanmuganatha...@zohocorp.com
wrote:
Hi,
I am the new user for the HBase .I installed Hadoop 0.20.2,
Zookeeper 3.3.3, HBase 0.90.1 in three node cluster. They are
-creation of regions]. In any
case, don't reduce if you can avoid it.
Dave
-Original Message-
From: Doug Meil [mailto:doug.m...@explorysmedical.com]
Sent: Sunday, July 17, 2011 4:40 PM
To: user@hbase.apache.org
Subject: Re: loading data in HBase table using APIs
Hi there-
Take a look
Hi there-
Just taking a stab at something...
http://hbase.apache.org/book.html#disable.splitting
... what is your compaction interval? Is it the default?
On 7/18/11 8:21 PM, hmch...@tsmc.com hmch...@tsmc.com wrote:
Hi there,
HBase read performance works fine in most of the time,
but
.
Maybe we can modify compaction interval, any ideas?
Thank you.
Fleming Chiu(邱宏明)
Ext: 707-2260
Be Veg, Go Green, Save the Planet!
Doug Meil
doug.meil@explorysmedica
l.com
Hi there-
re: that we have to reuse the Configuration object
You are probably referring to this...
http://hbase.apache.org/book.html#client.connections
... yes, that is general guidance on client connection..
re: do i have to create a pool of Configuration objects, to share them
Hi there-
I think there are two subjects here:
1) the fact that HTable isn't thread-safe
2) how counters work
Even if you are incrementing counters, you shouldn't be sharing HTable
instances across threads.
Counters get updated atomically on the RS, not on the client.
Counter behavior
but I am not sure how
HTablePool.get() would work under multithreaded environment.
thanks
On Wed, Jul 20, 2011 at 6:28 PM, Doug Meil
doug.m...@explorysmedical.comwrote:
Hi there-
I think there are two subjects here:
1) the fact that HTable isn't thread-safe
2) how counters work
Even
It's so that you can get the most recent entry with a Scan. Assuming that
the key-structure (as explained in the book) is something like
thingrev-timestamp. And you are trying to quickly find the most
recent entry for thing.
On 7/22/11 3:18 AM, edward choi mp2...@gmail.com wrote:
Hi,
I
, Nanheng Wu nanhen...@gmail.com wrote:
That makes sense. So is there a limit on how large the batch size can
be? Or, say if I pass all of my queries in one batch of size 10K,
would that cause problems?
On Fri, Jul 22, 2011 at 7:47 AM, Doug Meil
doug.m...@explorysmedical.com wrote:
That method
Following up on what Stack said, make sure you read this..
http://hbase.apache.org/book.html#performance
... this chapter also refers to OpenTSDB for certain topics (especially
key-design issues).
On 7/26/11 4:27 PM, Stack st...@duboce.net wrote:
On Tue, Jul 26, 2011 at 1:08 PM, Mark
For background information on HDFS-Hbase performance, reviewing the
umbrella ticket is a good place to start...
https://issues.apache.org/jira/browse/HDFS-1599
But if I am reading this correctly...
I write 100M data in Hbase,only 1M key/value,so all keys are in only
*one*
Store,and only 2
You could use an integer for the same purpose.
On 8/1/11 5:26 PM, Ted Yu yuzhih...@gmail.com wrote:
I am not aware of plan to implement this.
Cheers
On Mon, Aug 1, 2011 at 2:20 PM, Ioan Eugen Stan
stan.ieu...@gmail.comwrote:
Hello,
Is there any way to set/test for a bit flag in HBase? I
it sounds
like he doesn't need to have any kind of reduce phase [and may be a great
candidate for bulk loading and the pre-creation of regions]. In any
case, don't reduce if you can avoid it.
Dave
-Original Message-
From: Doug Meil [mailto:doug.m...@explorysmedical.com]
Sent: Sunday, July 17
. From the OP's description it sounds
like he doesn't need to have any kind of reduce phase [and may be a
great
candidate for bulk loading and the pre-creation of regions]. In any
case, don't reduce if you can avoid it.
Dave
-Original Message-
From: Doug Meil [mailto:doug.m
, Design questions and Operations/Troubleshooting questions.
http://wiki.apache.org/hadoop/Hbase/FAQ
Doug Meil
Chief Software Architect, Explorys
doug.m...@explorys.com
Thanks Jeff. I'll get it this week.
On 8/8/11 5:17 PM, Jeff Whiting je...@qualtrics.com wrote:
http://hbase.apache.org/book.html#number.of.cfs
In 6.2. On the number of column families it says HBase currently does
not do well with anything
about two or three column families so I
Hi there-
Please see the Hbase book. http://hbase.apache.org/book.html
This has a chapter on developing with Hbase. As for SQL, that's not
supported directly because Hbase is a NoSQL database (see the Data Model
chapter).
Doug
On 8/11/11 6:44 AM, Anurag Awasthi anuragawasth...@gmail.com
One thing you might want to look at is HTableUtil. It's on trunk, but you
can look at the source and port it to whatever version you are using.
We've found that region-sorting helps a lot by minimizing the number of RS
calls in any given flush.
On 8/11/11 5:57 PM, Jean-Daniel Cryans
See this section in the Hbase book...
11.6.3. Close ResultScanners
There is a snippet of how to use a Scan, which is what you'd what for that.
I just realized that there should be a better Scan example in the Data
Model chapter. I'll add it.
Doug Meil
Chief Software Architect, Explorys
See the Hbase book...
http://hbase.apache.org/book.html#number.of.cfs
On 8/13/11 8:17 PM, Mark static.void@gmail.com wrote:
I don't quite remember where but I think I remember hearing that you
should only have a handful of column families (1-4) per table. Is this
true and if so, why?
I wouldn't do it... Some of the other committers can comment more on
this, but there is state cached in HTable instances when scanning.
E.g.,...
protected class ClientScanner implements ResultScanner {
private final Log CLIENT_LOG = LogFactory.getLog(this.getClass());
// HEADSUP: The
Hi there-
You probably want to review this part of the hbase book...
http://hbase.apache.org/book.html#perf.reading
On 8/15/11 4:15 AM, Andrey Gomzin gomzind...@gmail.com wrote:
Hi!
I use HBase in a single-node mode. My rows in the table are huge. I have
to
read sequentially all columns
something I wish I would have understood back when I last designed
an hbase schema.
Dave
-Original Message-
From: Doug Meil [mailto:doug.m...@explorysmedical.com]
Sent: Saturday, August 13, 2011 6:21 PM
To: user@hbase.apache.org
Subject: Re: Column family limitations
See the Hbase book
and/or read data can be corrupted.
Or maybe is HTable still thread-safe for simple Gets only?
Thx.
On 14/08/11 15:29, Doug Meil wrote:
I wouldn't do it... Some of the other committers can comment more on
this, but there is state cached in HTable instances when scanning.
E.g
One of the things on my to-do list is to reorganize the Tools appendix
into a full-fledged Operations chapter. Even though that's a few weeks
out, there are still a lot of points in there worth noting. Especially in
the subject of backup (Master and RegionServers, etc.). That's arguably
the
To be on the safe side, you probably want to double-check this.
http://hbase.apache.org/book.html#client_dependencies
On 8/17/11 3:00 AM, Hari Sreekumar hsreeku...@clickable.com wrote:
Hi,
I want to separate my application machines from the HBase cluster. So far,
we have always run the
Versioning can be used to see the previous state of a record. Some people
need this feature, others don't.
One thing that may be worth a review is this...
http://hbase.apache.org/book.html#keysize
... and specifically the fact about all the values being freighted with
timestamp (aka version)
:
http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/mapreduce/package
-summary.html#sink
St.Ack
On Fri, Aug 5, 2011 at 2:19 AM, Doug Meil
doug.m...@explorysmedical.com
wrote:
It's not obvious to a lot of newer folks that an MR job can exist
minus
the R.
On 8/4/11 5:52 PM
If you just need a sample of rows from tables, use the client API (e.g.,
HTable) and scan off a few hundred rows or whatever you need. The harder
part of local unit testing is getting a coherent set of rows that makes
sense between all the tables - but that's something that every developer
has
Are you using maven 3 or maven 2? Should use 2.
That's a doc-item that is currently missing which I have changed locally
(but not patched yet).
On 8/23/11 9:28 AM, Anurag Awasthi anuragawasth...@gmail.com wrote:
Hello,
I am trying to modify the source code and for that I am following the
events, or messages of Facebook. In these cases, what is the
trade
off between saving them in different rows, and in different versions of
one
row?
Thank you.
Sean
2011/8/18 Doug Meil doug.m...@explorysmedical.com
Versioning can be used to see the previous state of a record. Some
Hi there-
http://hbase.apache.org/book.html#copytable
On 8/29/11 9:50 AM, Steinmaurer Thomas thomas.steinmau...@scch.at
wrote:
Hello,
for test purposes, I would like to have an identical copy of an existing
table under a different name on the same cluster. Basically I found the
example
Hi folks-
Seems like everything got up there ok. Let me know if anybody has any
issues.
On 8/29/11 5:15 PM, Doug Meil doug.m...@explorysmedical.com wrote:
Hi folks-
The HBase book has been udpatedŠ http://hbase.apache.org/book.html
There are a LOT of changes in hereŠ
* Schema Design
Hi there-
Have you read this?
http://hbase.apache.org/book.html#client_dependencies
On 9/2/11 9:53 AM, Diego Gomes Araújo diegogomesara...@gmail.com wrote:
Hello!
I'm having the following doubts, how do I connect in my HBase straight
from
my java web application.
For example:
I have my
Also, see this...
http://hbase.apache.org/book.html#developer
On 9/2/11 12:38 AM, Li Pi l...@cloudera.com wrote:
So you can't run HBase within eclipse, though you can run all the test
cases.
git pull HBase, then do mvn eclipse:eclipse, this should setup an eclipse
project in the directory.
, troubleshooting) or
design questions. The dev dist-list is for people who are changing
source.
If you have questions about coding Hbase, aim it at the dev-list.
Doug
On 9/2/11 10:22 AM, Doug Meil doug.m...@explorysmedical.com wrote:
Also, see this...
http://hbase.apache.org/book.html#developer
What Stack says. Plus, for other tips see...
http://hbase.apache.org/book.html#mapreduce
http://hbase.apache.org/book.html#schema
On 9/2/11 11:15 AM, Stack st...@duboce.net wrote:
Can you rely on versioning? If MR job runs once a day, only aggregate
whats changed in last day?
Turn off
Along with what Jack said, see this...
http://hbase.apache.org/book.html#required_configuration
.. and just double check that you don't have scheduled major compactions
going off once a day (the default)
On 9/3/11 7:54 PM, Jack Levin magn...@gmail.com wrote:
Make hbase.hregion.max.filesize
Explorys is sending a few, so +3 or so.
On 9/6/11 4:49 AM, Steven Noels stev...@outerthought.org wrote:
On Wed, Aug 31, 2011 at 5:21 AM, Todd Lipcon t...@cloudera.com wrote:
I haven't gotten many responses so far. If there doesn't seem to be
much interest, I may not spend the time to
Hi folks-
Stack deployed the book update last night and this contains some new material
(more MapReduce examples).
http://hbase.apache.org/book.html
Plus, the book and website contain the new logo!
Doug Meil
Chief Software Architect, Explorys
doug.m...@explorys.com
Hi there-
Have you tried this?
http://hbase.apache.org/book.html#copytable
It's the Java invocation of the copy-table function (without the ruby)
On 9/7/11 8:29 PM, Tom Goren t...@tomgoren.com wrote:
So I have read http://blog.sematext.com/2011/03/11/hbase-backup-options/
The built-in
What do you mean?
On 9/10/11 8:05 AM, sriram rsriram...@gmail.com wrote:
Is there any problem for using tablemapreduceutil
Hi Bryan, yep, that same advice is in the hbase book.
http://hbase.apache.org/book.html#mapreduce.specex
That's a good suggestion, and perhaps moving that config to
TableMapReduceUtil would be beneficial.
On 9/10/11 4:22 PM, Bryan Keller brya...@gmail.com wrote:
I believe there is a
Hi there-
Regarding EC2, see this in the Hbase book...
http://hbase.apache.org/book.html#trouble.ec2
Regarding ROOT/META, see this in the Hbase book
http://hbase.apache.org/book.html#arch.catalog
On 9/13/11 6:16 AM, Ronen Itkin ro...@taykey.com wrote:
Hi all,
How are you?
I am new to
Chris, agreed... There are sometimes that reducers aren't required, and
then situations where they are useful. We have both kinds of jobs.
For others following the thread, I updated the book recently with more MR
examples (read-only, read-write, read-summary)
I was in the middle of responding to Mike's email when yours arrived, so
I'll respond to both.
I think the temp-table idea is interesting. The caution is that a default
temp-table creation will be hosted on a single RS and thus be a bottleneck
for aggregation. So I would imagine that you would
I'll add this to the book in the MR section.
On 9/16/11 8:22 PM, Doug Meil doug.m...@explorysmedical.com wrote:
I was in the middle of responding to Mike's email when yours arrived, so
I'll respond to both.
I think the temp-table idea is interesting. The caution is that a default
temp
for a limited set of rows that
just care about the aggregations, but receive a lot of traffic. I
wonder if this will also be the case, if I was to use the source table
to maintain these temporary records, and not create a temp table on
the fly ...
On Fri, Sep 16, 2011 at 5:24 PM, Doug Meil
doug.m
, Doug Meil
doug.m...@explorysmedical.com wrote:
However, if the aggregations in the mapper were kept in a HashMap (key
being the aggregate, value being the count), and then the mapper made a
single pass over this map during the cleanup method and then did the
checkAndPuts, it would mean
to write MR-Jobs.
Regards,
Thomas
-Original Message-
From: Doug Meil [mailto:doug.m...@explorysmedical.com]
Sent: Freitag, 16. September 2011 21:42
To: user@hbase.apache.org
Subject: Re: Writing MR-Job: Something like OracleReducer, JDBCReducer
...
Chris, agreed... There are sometimes
If you need to pass args to a mapper-task for example, using the
Configuration object (as Stack suggested) is a common pattern. But just
don't stick anything huge in there because that config is apparently
copied repeatedly in the MR framework.
On 9/21/11 12:09 PM, Stack st...@duboce.net
You won't be able to see previous versions of a row. If that's not
important to you, then changing it to 1 will save you space.
Per..
http://hbase.apache.org/book.html#schema.versions
... The older versions are cleaned up after a major compaction.
On 9/25/11 6:45 AM, Rita
:
Doug Meil may point you to related doc.
Take a look at this as well:
https://issues.apache.org/jira/browse/HBASE-4241
On Thu, Sep 29, 2011 at 11:22 AM, Jameson Lopp jame...@bronto.com wrote:
Hm, well I didn't mention a number of other requirements for the feature
I'm building, but long story short
Is this happening in a standalone instance? Remote cluster?
Can you provide some context?
On 9/30/11 12:06 PM, sidusa mail david.ger...@sidusa.com wrote:
I am getting this error when I try and create a table using the hbase
shell.
ERROR:
I would hazard a guess that the Java client is the most utilized, followed
by REST and Thrift. But if your client application isn't in Java then the
Java client obviously won't work.
On 10/4/11 9:57 AM, Jim R. Wilson wilson.ji...@gmail.com wrote:
Hi HBase users,
Which is the more popular
wrote:
Are you surmising that from the description of setting a minimum version?
On Tue, Oct 4, 2011 at 2:31 PM, Doug Meil doug.m...@explorysmedical.com
wrote:
http://hbase.apache.org/book.html#schema.versions
I believe if you set that to 0 it should disable the versioning.
On 10/4/11 2
Hi there-
Check out the Hbase book...
http://hbase.apache.org/book.html#scan
On 10/5/11 3:29 AM, Rita rmorgan...@gmail.com wrote:
Hello,
I have a simple table where the data looks like this,
key,value
2011-01-01.foo,data01
2011-01-02.foo,data02
2011-01-03.foo,data03
2011-01-04.foo,data04
Hi there-
I don't think this is an HBase question.
On 10/7/11 10:35 AM, Ta, Le (Clovis) ta...@ne.bah.com wrote:
Hi,
I am getting the following exception when trying to run the
DBCountPageView example obtained from
http://search-hadoop.com/c/Map/Reduce:/src/examples/org/apache/hadoop/exam
Hi there-
There is a section in the book on this...
http://hbase.apache.org/book.html#arch.catalog
On 10/8/11 6:19 AM, yonghu yongyong...@gmail.com wrote:
Hello,
I read the blog
http://www.larsgeorge.com/2009/10/hbase-architecture-101-storage.html and
tried to understand the
You'll want to review this too...
http://hbase.apache.org/book.html#schema
On 10/10/11 2:51 AM, Sonal Goyal sonalgoy...@gmail.com wrote:
One possible schema for your case could be:
rowkey: book. Column familty: author, qualifiers one, two, three...
AND similar table for authors
rowkey:
(min/max now separate
sub-sections)
* Schema Design: Schema Design Smackdown! A new section has been added in
this chapter for commonly asked schema design question. (Spoiler alert: more
rows)
* OpsMgt: A first-cut capacity planning section for storage calcs has been
added.
Doug Meil
versions, *but keep at
least M versions around* (where M is the value for minimum number of row
versions, M=N)
Please refer to discussion toward the end of HBASE-4536 where Lars
suggested
dropping support for the case of M==N 0.
Cheers
On Tue, Oct 11, 2011 at 12:59 PM, Doug Meil
doug.m
at the end.
* More Performance/Arch information in light of recent discussions
(including EC2 and HDFS)
* Other minor edits.
Doug Meil
Chief Software Architect, Explorys
doug.m...@explorys.com
Jignesh, for an example of the error that JD is citing (and other common
errors) see the Troubleshooting chapter.
http://hbase.apache.org/book.html#trouble
On 10/17/11 2:43 PM, Jean-Daniel Cryans jdcry...@apache.org wrote:
It always depends on the scope of your test :)
For me the defaults
In addition to what Jonathan just said, see
http://hbase.apache.org/book.html#ides
On 10/19/11 3:05 AM, Jonathan Gray jg...@fb.com wrote:
Not sure what kind of integration you're talking about, but if just want
to create a project with the HBase source then just grab an SVN checkout
of an
Stack, he might be referring to this...
http://hbase.apache.org/book.html#versions
... I updated this recently based on an exchange with JD and somebody else.
On 10/21/11 1:08 AM, Stuti Awasthi stutiawas...@hcl.com wrote:
Hi St. Ack,
I read something while browsing . Right now don't have
And the HBase book. (http://hbase.apache.org/book.html)
To second what JD already said, the best way to learn HBase is to use it.
On 10/24/11 4:32 PM, Jean-Daniel Cryans jdcry...@apache.org wrote:
On Mon, Oct 24, 2011 at 1:21 PM, Jignesh Patel jigneshmpa...@gmail.com
wrote:
J-D,
Thanks
Hi there-
First, make sure you aren't tripping on any of these issues..
http://hbase.apache.org/book.html#perf.reading
On 10/26/11 6:21 AM, Rita rmorgan...@gmail.com wrote:
I am trying to do some simple statistics with my data but its taking
longer
than expected.
Here is how my data is
Hi there-
As a reminder about running without an NTP server, the config section of
the book strongly cautions against this:
http://hbase.apache.org/book.html#ntp
On 10/25/11 10:36 PM, Gaojinchao gaojinc...@huawei.com wrote:
Thanks for your reply.
Our application scenario, The equipment and
re: 30 million records.
We're obviously pro-HBase on this dist-list but one of the challenges of
HBase (and Hadoop in general) is that the architecture can tend to be
overkill on smaller datasets. That doesn't mean you shouldn't try HBase,
but expectations should be tempered.
Especially with
I'll add something in the docs.
On 10/27/11 3:35 AM, Lucian Iordache lucian.george.iorda...@gmail.com
wrote:
Yep. did not work entirely.
I had a job to run on 1000 regions. And the caching was 200. The job
crashed
with a lot of ClosedChannelExceptions + LeaseExceptions.
Set the caching to 10
point me to an example use case scenario that has taken
this approach?
Thanks
Vivek
On Thu, Oct 27, 2011 at 1:27 AM, Doug Meil
doug.m...@explorysmedical.comwrote:
re: 30 million records.
We're obviously pro-HBase on this dist-list but one of the challenges of
HBase (and Hadoop in general
Per what Stack just said...
http://hbase.apache.org/book.html#supported.datatypes
On 10/28/11 12:38 PM, Stack st...@duboce.net wrote:
On Fri, Oct 28, 2011 at 9:28 AM, Jain, Kokil ja...@bit-sys.com wrote:
Is it possible for cell values to be lists?
We don't support 'lists' natively. The
See...
http://hbase.apache.org/book.html#client
... The hbase client talks directly to the RegionServers.
On 10/28/11 2:24 PM, Jignesh Patel jigneshmpa...@gmail.com wrote:
If I use Java there will be 1-1 mapping between 1 JVM to 1 region server.
While I am not sure, I thought(presume)
rows. Otherwise you can wind up getting back just the data you
expect, but still scanning all the way to the end of the table, just
filtering out all the remaining rows.
On Wed, Oct 26, 2011 at 6:18 AM, Doug Meil
doug.m...@explorysmedical.com wrote:
Hi there-
First, make sure you aren't
In addition to what Joey said, it's worth taking inventory of your current
pain points. What are your current challenges? Ad-hoc queries? Creating
summaries? If it's entirely ad-hoc and your users want SQL, then I think
Joey pretty much nailed it.
For more info:
Hi there-
re: #1
http://hbase.apache.org/book.html#perf.configurations
Regarding this, for the 0.90.x codebase the largest recommended region
size is 4Gb. The 20Gb number in the book now was for a cluster running
which was running Hfile v2 format, which is different than what is in
Hi there-
re: The question is : in what application BLOCKSIZE should be changed
(increased or decreased) ?
See.. http://hbase.apache.org/book.html#schema.creation
and...
http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/HColumnDescriptor.h
tml
On 11/14/11 3:51 AM, Damien Hardy
Hi there-
See...
http://hbase.apache.org/book.html#rowkey.design
http://hbase.apache.org/book.html#mapreduce.example.summary
http://hbase.apache.org/book.html#precreate.regions
Especially focus on the rowkey part because it mentioned OpenTSDB
specifically.
On 11/13/11 11:10 PM,
Glad to worked through that and everything is working. I will add an
example of MR to Hbase-to-HDFS in the book.
On 11/14/11 1:24 AM, Stuti Awasthi stutiawas...@hcl.com wrote:
Hi,
I think that issue is with Filesystem Configuration, as in config, it is
picking HbaseConfiguration. When I
Hi there-
Look at the Hbase files on the HDFS file system...
http://hbase.apache.org/book.html#trouble.namenode.hbase.objects
... and run some checks like 'fsck'
On 11/14/11 8:39 PM, Mark static.void@gmail.com wrote:
How can this be tested and or verified? Would/should it show up
Hi there, per..
http://hbase.apache.org/book.html#perf.handlers
... this is a per-RegionServer config, and it would take a pretty big box
to satisfy 100 concurrent RS requests.
On 11/15/11 11:09 AM, Mark static.void@gmail.com wrote:
In the HBase book it states:
It is safe to set that
Yep, I'll update it. Thanks for point that out.
On 11/15/11 12:43 PM, Mark static.void@gmail.com wrote:
Perhaps section 2.8.2.3 of the hbase book should be updated then?
On 11/15/11 9:17 AM, Doug Meil wrote:
Hi there, per..
http://hbase.apache.org/book.html#perf.handlers
Also, there is a versioned Get example here...
http://hbase.apache.org/book.html#get
On 11/16/11 12:34 PM, Jean-Daniel Cryans jdcry...@apache.org wrote:
You need to tell the Get or Scan to fetch more versions. For example,
the help for the get commands gives this example:
hbase get
I'll update this. Thanks.
On 11/16/11 12:17 PM, lars hofhansl lhofha...@yahoo.com wrote:
Hi Mark,
good find. I think that works by accident and the book is wrong.
row + new byte[] {0} will use byte[].toString() and actually result in
something like: row[B@152b6651, which (again
Also, there is an example of a versioned get here...
http://hbase.apache.org/book.html#get
On 11/16/11 12:34 PM, Jean-Daniel Cryans jdcry...@apache.org wrote:
You need to tell the Get or Scan to fetch more versions. For example,
the help for the get commands gives this example:
hbase get
I'll update.
It's great that people are actually reading the docs now! Keep the
comments coming. :-)
On 11/17/11 1:49 PM, lars hofhansl lhofha...@yahoo.com wrote:
That's better I agree. stop key = start key is valid, though (it becomes
a get then).
Should definitely mention that
You might submit an MR job via thrift, but you don't want to do a rowcount
on a large table without MapReduce.
On 11/21/11 7:43 AM, Jahangir Mohammed md.jahangi...@gmail.com wrote:
Region is the split used by mapper.
Thanks,
Jahangir Mohammed.
On Mon, Nov 21, 2011 at 6:44 AM, Rita
Hi there-
The last part of 6.3.2.3 is important: Expect tradeoffs
when designing rowkeys. Some of this stuff you just have to
prototype.
In terms of performance...
http://hbase.apache.org/book.html#keyvalue
.. if you have huge keys, you'll feel it there.
For the MR part, see...
This is a good question. I'm actually not sure.
According to the Delete Javadoc...
http://hbase.apache.org/docs/current/api/org/apache/hadoop/hbase/client/Del
ete.html
To delete an entire row, instantiate a Delete object with the row
to delete. To further define the scope of what to delete,
Thanks Lars, I'll update the docs with this.
On 11/27/11 6:31 PM, lars hofhansl lhofha...@yahoo.com wrote:
That is correct.
From: yonghu yongyong...@gmail.com
To: user@hbase.apache.org; lars hofhansl lhofha...@yahoo.com
Sent: Sunday, November 27, 2011
Hi there-
I'm happy for your new group, but can you guys take the hbase user
dist-list off this conversation, please?
On 11/28/11 2:27 PM, Craig Dupree craig.m.dup...@gmail.com wrote:
David,
Please slow down, and let the rest of us have a chance to catch up
with you. You've gone from
Hi folks-
The Apache HBase book has been updated. It's been a few weeks since it's been
updated and there are a variety of small improvements in there.
Doug Meil
Chief Software Architect, Explorys
doug.m...@explorys.com
Hi there-
I'd like to introduce you to the Hbase book:
http://hbase.apache.org/book.html
There are also 2 sections specifically about running in EC2.
http://hbase.apache.org/book.html#perf.ec2
http://hbase.apache.org/book.html#trouble.ec2
On 11/29/11 9:11 PM, 庄阳
To expand on what Lars said, there is an example of how this is layed out
on disk...
http://hbase.apache.org/book.html#trouble.namenode.disk
... regions distribute the table, so two different tables will be
distributed by separate sets of regions.
On 12/1/11 3:14 AM, Lars George
Scans work on startRow/stopRow...
http://hbase.apache.org/book.html#scan
... you can also select by timestamp *within the startRow/stopRow
selection*, but this isn't intended to quickly select rows by timestamp
irrespective of their keys.
On 12/1/11 9:03 AM, Srikanth P. Shreenivas
This can be a bit tricky because of the scan caching, for example...
http://hbase.apache.org/book.html#rs_metrics
12.4.2.14. hbase.regionserver.requests
Total number of read and write requests. Requests correspond to
RegionServer
RPC calls, thus a single Get will result in 1 request, but a
Hi folks-
The home page (http://hbase.apache.orhttp://hbase.apache.orgg) was
reorganized and updated. Similar info, just a bit easier to read.
Also, the book has been updated as well.
Doug Meil
Chief Software Architect, Explorys
doug.m...@explorys.com
I believe that these filters...
http://hbase.apache.org/book.html#thrift.filter-language
... were added to .92. This should be marked as such in the book. I'll
update it.
On 12/4/11 11:48 PM, Stuti Awasthi stutiawas...@hcl.com wrote:
Hi,
I tried using Filters with Java Api and it works
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