Hi there-
re: The max file size the whole cluster can store for one CF is 60G,
right?
No, the max file-size for a region, in your example, is 60GB. When the
data exceeds that the region will split - and then you'll have 2 regions
with 60GB limit.
Check out this section of the RefGuide:
Additionally, don't take it for granted that an RDBMS and HBase aren't the
same thing. Check out these sections of the RefGuide if you haven't
already.
http://hbase.apache.org/book.html#datamodel
http://hbase.apache.org/book.html#schema
On 11/1/12 11:01 PM, Shumin Wu shumin...@gmail.com
The Hbase RefGuide has a big entry in the appendix on Hfile v2.
On 11/3/12 5:34 PM, Marcos Ortiz mlor...@uci.cu wrote:
Regards to all HBase users.
I'm looking for all available information about the current development
of HFile
version 2 to write a blog post talking about the main
Hi there,
Pretty similar approach with Hbase. See the Scan class.
http://hbase.apache.org/book.html#data_model_operations
On 11/21/12 1:04 PM, Vajrakumar vajra.ku...@pointcross.com wrote:
Hello all,
As we do paging in solr using start and rowCount I need to implement same
through hbase.
Hi there-
If he's using monotonically increasing keys the pre splits won't help
because the same region is going to get all the writes.
http://hbase.apache.org/book.html#rowkey.design
On 11/21/12 12:33 PM, Suraj Varma svarma...@gmail.com wrote:
Ajay:
Why would you not want to specify
.
-Original Message-
From: Doug Meil [mailto:doug.m...@explorysmedical.com]
Sent: 22 November 2012 00:21
To: user@hbase.apache.org
Subject: Re: Paging On HBASE like solr
Hi there,
Pretty similar approach with Hbase. See the Scan class.
http://hbase.apache.org/book.html
Hi there, somebody already wisely mentioned the link to the # of CF's
entry, but here are a few other entries that can save you some heartburn
if you read them ahead of time.
http://hbase.apache.org/book.html#datamodel
http://hbase.apache.org/book.html#schema
Hi there-
re: From what I have understood, these properties are not for Hbase but
for the Hbase client which we write. They tell the client where to look for
ZK.
Yep. That's how it works. Then the client looks up ROOT/META and then
the client talks directly to the RegionServers.
Hi there-
This is also discussed in the Regions section in the RefGuide:
http://hbase.apache.org/book.html#regions.arch
9.7.3. Region-RegionServer Locality
On 12/3/12 10:08 AM, Kevin O'dell kevin.od...@cloudera.com wrote:
JM,
If you have disabled the balancer and are manually moving
Hi there,
Not tried multi-RS on a single node, but have you looked at the off-heap
cache? It's a part of 0.92.x. From what I understand that feature was
designed with this case in mind (I.e., trying to do a lot of caching, but
don't want to introduce GC issues in RS).
Hi there,
You probably want to read this section on the RefGuide about deleting from
HBase.
http://hbase.apache.org/book.html#perf.deleting
On 12/5/12 8:31 AM, Jean-Marc Spaggiari jean-m...@spaggiari.org wrote:
Hi Manoj,
Delete in HBase is like a put.
If you want to delete the entire
I agree it shouldn't fail (slow is one thing, fail is something else), but
regarding HBase Master Web UI showed only one region for the destination
table., you probably want to pre-split your destination table.
It's writing to one region, splitting, writing to those regions,
splitting, etc.
Hi there,
When sizing your data, don't forget to read thisŠ
http://hbase.apache.org/book.html#schema.creation
and
http://hbase.apache.org/book.html#regions.arch
9.7.5.4. KeyValue
You need to understand how Hbase stores data internally on initial design
to avoid problems down the line. Keep
Hi there-
You don't want a filter for this, use a Scan with the lead portion of the
key.
http://hbase.apache.org/book.html#datamodel
See 5.7.3. Scans
On a related topic, this is a utility in process to make composite key
construction easier.
https://issues.apache.org/jira/browse/HBASE-7221
Hi there,
The HBase RefGuide has a comprehensive case study on such a case. This
might not be the exact problem, but the diagnostic approach should help.
http://hbase.apache.org/book.html#casestudies.slownode
On 1/4/13 10:37 PM, Liu, Raymond raymond@intel.com wrote:
Hi
I encounter
for feedback, but this time aimed at users of HBase:
how has your key-building experience been?
Thanks!
On 1/7/13 11:04 AM, Doug Meil doug.m...@explorysmedical.com wrote:
Greetings folks-
I would like to restart the conversation on
https://issues.apache.org/jira/browse/HBASE-7221 because
://jira.kiji.org/browse/schema-3 where we have a design doc that goes
into a bit more detail.
Cheers,
- Aaron
On Tue, Jan 15, 2013 at 2:01 PM, Doug Meil
doug.m...@explorysmedical.comwrote:
Hi there, well, this request for input fell like a thud. :-)
But I think perhaps it has to do with the fact that I
Hi there-
If you're absolutely new to Hbase, you might want to check out the Hbase
refGuide in the architecture, performance, and troubleshooting chapters
first.
http://hbase.apache.org/book.html
In terms of determining why your region servers just die, I think you
need to read the background
Hi there,
I'd recommend reading the Schema Design chapter in the RefGuide because
there are some good tips and hard-learned lessons.
http://hbase.apache.org/book.html#schema
Also, all your examples use composite row keys (not a surprise, a very
common pattern) and one thing I would like to
Hi there,
See this section of the HBase RefGuide for information about bulk loading.
http://hbase.apache.org/book.html#arch.bulk.load
On 1/18/13 12:57 PM, praveenesh kumar praveen...@gmail.com wrote:
Hey,
Can someone throw some pointers on what would be the best practice for
bulk
imports
Hi there-
You probably want to review this section of the RegGuide:
http://hbase.apache.org/book.html#mapreduce
re: it's inefficient to have one scan object to scan everything.
It is. But in the MapReduce case, there is a Map-task for each input
split (see the RefGuide for details), and
Hi there-
On top of what everybody else said, for more info on rowkey design and
pre-splitting see http://hbase.apache.org/book.html#schema (as well as
other threads in this dist-list on that topic).
On 1/19/13 4:12 PM, Mohammad Tariq donta...@gmail.com wrote:
Hello Austin,
I am
Hi there-
Here is a comment in the RefGuide on joins in the HBase data model.
http://hbase.apache.org/book.html#joins
Short answer, you need to do it yourself (e.g., either with an in-memory
hashmap or instantiating an HTable of the other table, depending on your
situation).
For other MR
Good to hear! Given your experience, I'd appreciate your feedback on the
section 6.3.6. Relationship Between RowKeys and Region Splits in...
http://hbase.apache.org/book.html#schema.creation
Š because it's on that same topic. Any other points to add to this?
Thanks!
On 2/14/13 11:08 PM,
Sorry I'm late to this thread but I was the guy behind HBASE-7221 and the
algorithms specifically mentioned were MD5 and Murmur (not SHA-1). And
implementation of Murmur already exists in Hbase, and the MD5
implementation was the one that ships with Java.
The intent was to include hashing
HmmmŠ good question.
I think that fixed width support is important for a great many rowkey
constructs cases, so I'd rather see something like losing MIN_VALUE and
keeping fixed width.
On 4/1/13 2:00 PM, Nick Dimiduk ndimi...@gmail.com wrote:
Heya,
Thinking about data types and
For the record, the refGuide mentions potential issues of CF lumpiness
that you mentioned:
http://hbase.apache.org/book.html#number.of.cfs
6.2.1. Cardinality of ColumnFamilies
Where multiple ColumnFamilies exist in a single table, be aware of the
cardinality (i.e., number of rows).
If
You beat me to it! :-)
I just realized that right when I hit enter on my previous email.
On 4/9/13 2:05 PM, Otis Gospodnetic otis.gospodne...@gmail.com wrote:
Hi Stack (cleaning your inbox? ;))
Looks like Doug did it a while back -
https://issues.apache.org/jira/browse/HBASE-6574 ?
Hi there, regarding this...
We are passing random 1 row-keys as input, while HBase is taking
around
17 secs to return 1 records.
…. Given that you are generating 10,000 random keys, your multi-get is
very likely hitting all 5 nodes of your cluster.
Historically, multi-Get used to
Hi folks,
I reorganized the Schema Design case studies 2 weeks ago and consolidated them
into here, plus added several cases common on the dist-list.
http://hbase.apache.org/book.html#schema.casestudies
Comments/suggestions welcome. Thanks!
Doug Meil
Chief Software Architect, Explorys
, Apr 19, 2013 at 4:09 PM, Marcos Luis Ortiz Valmaseda
marcosluis2...@gmail.com wrote:
Wow, great work, Doug.
2013/4/19 Doug Meil doug.m...@explorysmedical.com
Hi folks,
I reorganized the Schema Design case studies 2 weeks ago and
consolidated
them into here, plus
Hi there-
As was described in the HBase chapter in the Hadoop book by Tom White, you
don't want to insert a lot of data at one time with incrementing keys.
-MM-DD would seem to me to be a reasonable lead-portion of a key - as long
as you aren't trying to insert everything in time-order
You need to execute two Jobs serially that use TableMapper in a thread. Can't
use JobControl.
-Original Message-
From: Vishal Kapoor [mailto:vishal.kapoor...@gmail.com]
Sent: Tuesday, March 22, 2011 1:34 PM
To: user@hbase.apache.org
Subject: JobControl and HBase MR chaining
with
The simplest way to do this is with a thread that executes the jobs you want to
run synchronously
Job job1 = ...
job1.waitForCompletion(true);
Job job2 = ...
job2.waitForCompletion(true);
-Original Message-
From: Vishal Kapoor
Hi there everybody-
Just thought I'd let everybody know about this... Stack and I have been
working on updating the HBase book and porting portions of the very-out-date
HBase wiki to the HBase book. These two pages...
http://wiki.apache.org/hadoop/Hbase/DesignOverview
(changing to user hbase distlist instead of general hadoop)
Hive runs as MapReduce jobs. If you are looking for quick (i.e.,
non-MapReduce) access to tables, you need to use the HBase client (Get, Scan).
http://hbase.apache.org/book.html#datamodel
-Original Message-
From: Mag Gam
Re: maxHeap=3991
Seems like an awful lot of data to put in a 4gb heap.
-Original Message-
From: 陈加俊 [mailto:cjjvict...@gmail.com]
Sent: Monday, April 11, 2011 8:35 PM
To: hbase-u...@hadoop.apache.org
Subject: too many regions cause OME ?
Is it too many regions ? Is the memory
Hi there-
For what it's worth, although we haven't had this particular issue we've
certainly had other bumps and bruises (GC of death, and other metadata issues
caused when a split dies during a GC of death, etc.). But there are few
general items that helped in stability and performance I
Context: we're still on .89 - so we can't take advantage of the MemStore
allocation buffers yet. One of the most important metrics for us was GC-stuck
region servers, and more nodes + more memory + scheduling periodic cluster
restarts helped in our situation. I wholeheartedly agree with the
The HBase book has come through some updates recently on these metrics.
http://hbase.apache.org/book.html#hbase_metrics
-Original Message-
From: saint@gmail.com [mailto:saint@gmail.com] On Behalf Of Stack
Sent: Friday, April 15, 2011 5:04 AM
To: user@hbase.apache.org
Cc: 陈加俊;
Hi there-
Review the HBase book too.
http://hbase.apache.org/book.html#datamodel
http://hbase.apache.org/book.html#client
http://hbase.apache.org/book.html#performance
-Original Message-
From: JohnJohnGa [mailto:johnjoh...@gmail.com]
Sent: Sunday, April 24, 2011 2:46 AM
To:
experiment more with this option.
Right now I want to stay away from MR, mainly because of cluster warm-up time,
and I want to get results almost real-time (few seconds max).
Thanks for the tip on caching!
On 01.05.2011 19:55, Doug Meil wrote:
What caching value are you using on the scan? If you
Hi everybody-
There I just thought I'd ping the group to see what everybody thought about
this RS metric suggestion...
https://issues.apache.org/jira/browse/HBASE-3869
Doug Meil
Chief Software Architect, Explorys
doug.m...@explorys.com
Read this section in the HBase book...
http://hbase.apache.org/book.html#d427e2108
Java client configuration
-Original Message-
From: James McGlothlin [mailto:mcglothli...@gmail.com]
Sent: Monday, May 09, 2011 4:57 PM
To: hbase-u...@hadoop.apache.org
Subject: just trying to get into
Hi folks, the wiki Troubleshooting page is now obsolete. It's accessible via
the obsolete pages link.
Stack just updated the website with the updates to the Troubleshooting section.
Enjoy!
-Original Message-
From: Doug Meil [mailto:doug.m...@explorysmedical.com]
Sent: Friday, May
For starters, take a look at this...
http://hbase.apache.org/book.html#perf.configurations
-Original Message-
From: Oleg Ruchovets [mailto:oruchov...@gmail.com]
Sent: Monday, May 16, 2011 6:42 AM
To: user@hbase.apache.org
Subject: major compaction best practice
Hi ,
We running
It's currently bad in general.
-Original Message-
From: Lars Egarots [mailto:lars.egar...@yahoo.com]
Sent: Monday, May 16, 2011 12:36 PM
To: user@hbase.apache.org
Subject: number of column families
The user documentation, in the Apache HBase book, states: HBase currently does
not do
Hi there-
Re: When I started inserting data in the tables it seems that they are
always inserting in a single region,
You probably want to read this as a general warning...
http://hbase.apache.org/book.html#timeseries
.. and check this out as a potential solution for bucketing timeseries
Re: The problem is that the few references to that question I found recommend
pulling one table to the mapper and then do a lookup for the referred row in
the second table.
With multi-get in .90.x you could perform some reasonably clever processing and
not do the lookups one-by-one but in
Eran's observation was that a join is solvable in a Mapper via lookups on a 2nd
HBase table, but it might not be that efficient if the lookups are 1 by 1. I
agree with that.
My suggestion was to use multi-Get for the lookups instead. So you'd hold onto
a batch of records in the Mapper and
1) You probably want to upgrade to a more recent version of HBase
2) You probably want to read this:
http://hbase.apache.org/book.html#performance
Not knowing anything about your cluster size or table design, Put delays can be
exacerbated by a number of things.
3) As for the time limit, I
Re: Is that still considered current? Do folks on the list generally agree
with that guideline?
Yes and yes. HBase runs better with fewer CFs.
-Original Message-
From: Leif Wickland [mailto:leifwickl...@gmail.com]
Sent: Thursday, June 02, 2011 5:41 PM
To: user@hbase.apache.org
Per... http://hbase.apache.org/book.html#supported.datatypes
... you could store an XML file in HBase as a single value, but the
responsibility of parsing the XML an interpreting it is entirely yours.
-Original Message-
From: James Ram [mailto:hbas...@gmail.com]
Sent: Friday, June 03,
You probably want to read this...
http://hbase.apache.org/book.html#performance
-Original Message-
From: Hiller, Dean x66079 [mailto:dean.hil...@broadridge.com]
Sent: Sunday, June 05, 2011 7:22 PM
To: hbase-u...@hadoop.apache.org
Subject: performance monitoring question
So, we were
Re: So, you all realize the joins have been talked about in the database
community for 40 years?
Great point. What's old is new!:-)
My suggested from earlier in the thread was a variant of nested loops by using
multi-get in HTable, which would reduce the number of RPC calls. So it's a
Check the web console.
-Original Message-
From: Andre Reiter [mailto:a.rei...@web.de]
Sent: Monday, June 06, 2011 5:27 PM
To: user@hbase.apache.org
Subject: Re: full table scan
good question... i have no idea...
i did not define explicitly the number of regions for the table, how can
Are you experiencing this?
https://issues.apache.org/jira/browse/HBASE-3686
One our guys found and fixed this a while back. This was found with Scans, but
since a Gets are implemented as Scans on the RS I thought this might be
relevant.
-Original Message-
From: Zhenyu Zhong
Re: With respect to Doug's posts, you can't do a multi-get off the bat
That's an assumption, but you're entitled to your opinion.
-Original Message-
From: Michael Segel [mailto:michael_se...@hotmail.com]
Sent: Monday, June 06, 2011 10:08 PM
To: user@hbase.apache.org
Subject: RE: How to
If I understand the history correctly, round-robin was used in .89, but
retains is the policy for .90+.
My 2-cents is that if/when region-shuffling is required, I'd rather do that
with another utility and keep that out of cluster startup.
-Original Message-
From: saint@gmail.com
Segel
On Jun 8, 2011, at 8:01 AM, Doug Meil doug.m...@explorysmedical.com wrote:
Re: With respect to Doug's posts, you can't do a multi-get off the bat
That's an assumption, but you're entitled to your opinion.
-Original Message-
From: Michael Segel [mailto:michael_se...@hotmail.com
Praveenesh, in addition to what Joey already said in another response to your
question, see these chapters in the HBase book.
http://hbase.apache.org/book.html#schema
http://hbase.apache.org/book.html#datamodel
-Original Message-
From: praveenesh kumar [mailto:praveen...@gmail.com]
Re: keyed by something like [timestamp, action details, session ID]
Read the part about monotonically increasing keys in the HBase book. There
have been lots of other threads in the dist-list about this topic too.
-Original Message-
From: Leif Wickland
Re: monotonically increasing column names.
No problem with that.
-Original Message-
From: Leif Wickland [mailto:leifwickl...@gmail.com]
Sent: Monday, June 13, 2011 5:29 PM
To: user@hbase.apache.org
Subject: Re: Question from HBase book: HBase currently does not do well with
This is briefly covered in the client architecture overview...
http://hbase.apache.org/book.html#client
... the gist is that as David describes the client talks directly to the
RegionServers, and knows the start/end keys available.
-Original Message-
From: Buttler, David
ahead of time if
you have a good handle on the data distribution.
-chris
On Jun 15, 2011, at 10:47 AM, Shuja Rehman wrote:
yeah, i understand this but my question was that who will define the
start and stop key of a region server? did u get my point?
On Wed, Jun 15, 2011 at 9:53 PM, Doug
Assuming that this approach was taken to create new regions instead of
splitting, since this is assuming monotonically increasing keys you would
always have one hot region that would be receiving all of the new data. That
would limit load throughput.
-Original Message-
From:
Hi there-
The rowids and values are hex.
You probably want to look at the hbase book...
http://hbase.apache.org/book.html#datamodel
... because eventually you'll want to do something with this data other than
see it in the shell.
-Original Message-
From: hbaser
You need to go through HBaseAdmin.
http://hbase.apache.org/book.html#schema.creation
Disable the table, add the CF, then re-enable the table.
-Original Message-
From: Eranda Sooriyabandara [mailto:0704...@gmail.com]
Sent: Friday, June 17, 2011 2:11 PM
To: user@hbase.apache.org
Hi there-
There is a section in the hbase book on pre-creating regions.
http://hbase.apache.org/book.html#precreate.regions
-Original Message-
From: Hiller, Dean x66079 [mailto:dean.hil...@broadridge.com]
Sent: Friday, June 17, 2011 4:28 PM
To: user@hbase.apache.org
Subject: RE: hbase
Look here in the HBase book for these, and other, tips.
http://hbase.apache.org/book.html#performance
-Original Message-
From: jdcry...@gmail.com [mailto:jdcry...@gmail.com] On Behalf Of Jean-Daniel
Cryans
Sent: Monday, June 20, 2011 2:03 PM
To: user@hbase.apache.org
Subject: Re:
Just be aware that the data in the write-buffer is in the client - so it hasn't
been sent to the RegionServers yet.
So as long as your client doesn't die, you should be ok.
-Original Message-
From: saurabh@gmail.com [mailto:saurabh@gmail.com] On Behalf Of Sam
Seigal
Sent:
TableOutputFormat also does this...
table.setAutoFlush(false);
Check out the HBase book for how the writebuffer works with the HBase client.
http://hbase.apache.org/book.html#client
-Original Message-
From: edward choi [mailto:mp2...@gmail.com]
Sent: Tuesday, June 21, 2011 10:23
/Troubleshooting
chapters. Additionally, there are more entries in Troubleshooting plus a few
other code examples sprinkled in.
If anybody has difficulty finding anything, just email the dist-list.
Doug Meil
Chief Software Architect, Explorys
doug.m...@explorys.com
It's already deployed.
-Original Message-
From: Zhong, Andy [mailto:sheng.zh...@searshc.com]
Sent: Wednesday, June 22, 2011 10:54 AM
To: user@hbase.apache.org; hbase-u...@hadoop.apache.org; Doug Meil
Subject: RE: HBase book updates
Doug, could you share them? Thanks, -Andy Zhong
Hi there-
You probably want to give this a read ...
http://hbase.apache.org/book.html#architecture
... most people run Master on the NameNode.
-Original Message-
From: Laurent Hatier [mailto:laurent.hat...@gmail.com]
Sent: Wednesday, June 22, 2011 5:14 PM
To: user@hbase.apache.org
Hi there-
Take a look at this for starters...
http://hbase.apache.org/book.html#mapreduce
if you do job.waitForCompletion(true); it will execute synchronously. If you
do job.waitForCompletion(false) it will fire and forget. A simple pattern is
to spin off a thread where it executes
Hi there-
If you only have 100 rows I think that HBase might be overkill.
You probably want to start with this to get a background on what HBase can do...
http://hbase.apache.org/book.html
.. there is a section on MapReduce with HBase as well.
-Original Message-
From: Florin P
, 2011 at 23:54, Doug Meil
doug.m...@explorysmedical.comwrote:
No problem! I added a patch to the book for this case. It probably could
have been a little more obvious.
-Original Message-
From: Eranda Sooriyabandara [mailto:0704...@gmail.com]
Sent: Friday, June 17, 2011 3:54 PM
I'd start with the Hbase book
http://hbase.apache.org/book.html#gc
On 6/29/11 10:50 PM, xiujin yang xiujiny...@hotmail.com wrote:
Hi all
Backgrand:
Hadoop : CDH3u0
HBase : CDH3u0
ZK : CDH3u0
Servers: 30
Now our hbase server is more than 64G. and we want to use hbase on
online
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
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-
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:
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
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
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
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
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
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.
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 ?
.
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
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
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