Amandeep Khurana wrote:
I'm getting the following error while starting a MR job:
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException:
oracle.jdbc.driver.OracleDriver
at
org.apache.hadoop.mapred.lib.db.DBInputFormat.configure(DBInputFormat.java:297)
... 21 more
Caused
Edward J. Yoon wrote:
I just made a wiki page -- http://wiki.apache.org/hadoop/Hambrug --
Let's discuss about the graph computing framework named Hambrug.
ok, first Q, why the Hambrug. To me that's just Hamburg typed wrong,
which is going to cause lots of confusion.
What about something mor
Patterson, Josh wrote:
Steve,
I'm a little lost here; Is this a replacement for M/R or is it some new
code that sits ontop of M/R that runs an iteration over some sort of
graph's vertexes? My quick scan of Google's article didn't seem to yeild
a distinction. Either way, I'd say for our data that
30015
==
Exiting project "citerank"
==
BUILD SUCCESSFUL - at 25/06/09 17:09
Total time: 9 minutes 1 second
--
Steve Loughran http://www.10
Edward J. Yoon wrote:
What do you think about another new computation framework on HDFS?
On Mon, Jun 22, 2009 at 3:50 PM, Edward J. Yoon wrote:
http://googleresearch.blogspot.com/2009/06/large-scale-graph-computing-at-google.html
-- It sounds like Pregel seems, a computing framework based on d
Ram Kulbak wrote:
Hi,
The exception is a result of having xerces in the classpath. To resolve,
make sure you are using Java 6 and set the following system property:
-Djavax.xml.parsers.DocumentBuilderFactory=com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl
This can also be re
Stas Oskin wrote:
Hi.
So what would be the recommended approach to pre-0.20.x series?
To insure each file is used only by one thread, and then it safe to close
the handle in that thread?
Regards.
good question -I'm not sure. For anythiong you get with
FileSystem.get(), its now dangerous to
Raghu Angadi wrote:
Is this before 0.20.0? Assuming you have closed these streams, it is
mostly https://issues.apache.org/jira/browse/HADOOP-4346
It is the JDK internal implementation that depends on GC to free up its
cache of selectors. HADOOP-4346 avoids this by using hadoop's own cache.
Scott Carey wrote:
Furthermore, if for some reason it is required to dispose of any objects after
others are GC'd, weak references and a weak reference queue will perform
significantly better in throughput and latency - orders of magnitude better -
than finalizers.
Good point.
I would mak
jason hadoop wrote:
Yes.
Otherwise the file descriptors will flow away like water.
I also strongly suggest having at least 64k file descriptors as the open
file limit.
On Sun, Jun 21, 2009 at 12:43 PM, Stas Oskin wrote:
Hi.
Thanks for the advice. So you advice explicitly closing each and eve
Andrew Wharton wrote:
https://issues.apache.org/jira/browse/HADOOP-4539
I am curious about the state of this fix. It is listed as
"Incompatible", but is resolved and committed (according to the
comments). Is the backup name node going to make it into 0.21? Will it
remove the SPOF for HDFS? And i
s are interfering
If everything works, the problem is in the eclipse plugin (which I don't
use, and cannot assist with)
--
Steve Loughran http://www.1060.org/blogxter/publish/5
Author: Ant in Action http://antbook.org/
Ninad Raut wrote:
OSGi provides navigability to your components and create a life cycle for
each of those components viz; install. start, stop, un- deploy etc.
This is the reason why we are thinking of creating components using OSGi.
The problem we are facing is our components using mapreduce and
John Martyniak wrote:
Does hadoop "cache" the server names anywhere? Because I changed to
using DNS for name resolution, but when I go to the nodes view, it is
trying to view with the old name. And I changed the hadoop-site.xml
file so that it no longer has any of those values.
in SVN hea
John Martyniak wrote:
When I run either of those on either of the two machines, it is trying
to resolve against the DNS servers configured for the external addresses
for the box.
Here is the result
Server:xxx.xxx.xxx.69
Address:xxx.xxx.xxx.69#53
OK. in an ideal world, each NIC ha
John Martyniak wrote:
I am running Mac OS X.
So en0 points to the external address and en1 points to the internal
address on both machines.
Here is the internal results from duey:
en1: flags=8963
mtu 1500
inet6 fe80::21e:52ff:fef4:65%en1 prefixlen 64 scopeid 0x5
inet 192.168.1.102 n
John Martyniak wrote:
My original names where huey-direct and duey-direct, both names in the
/etc/hosts file on both machines.
Are nn.internal and jt.interal special names?
no, just examples on a multihost network when your external names
could be something completely different.
What does
John Martyniak wrote:
David,
For the Option #1.
I just changed the names to the IP Addresses, and it still comes up as
the external name and ip address in the log files, and on the job
tracker screen.
So option 1 is a no go.
When I change the "dfs.datanode.dns.interface" values it doesn't
Mayuran Yogarajah wrote:
There are always a few 'Failed/Killed Task Attempts' and when I view the
logs for
these I see:
- some that are empty, ie stdout/stderr/syslog logs are all blank
- several that say:
2009-06-06 20:47:15,309 WARN org.apache.hadoop.mapred.TaskTracker: Error
running child
Aaron Kimball wrote:
Finally, there's a third scheduler called the Capacity scheduler. It's
similar to the fair scheduler, in that it allows guarantees of minimum
availability for different pools. I don't know how it apportions additional
extra resources though -- this is the one I'm least famil
Matt Massie wrote:
Anthony-
The ganglia web site is at http://ganglia.info/ with documentation in a
wiki at http://ganglia.wiki.sourceforge.net/. There is also a good wiki
page at IBM as well
http://www.ibm.com/developerworks/wikis/display/WikiPtype/ganglia .
Ganglia packages are available
b wrote:
But after formatting and starting DFS i need to wait some time (sleep
60) before putting data into HDFS. Else i will receive
"NotReplicatedYetException".
that means the namenode is up but there aren't enough workers yet.
Todd Lipcon wrote:
Hi Jianmin,
This is not (currently) supported by Hadoop (or Google's MapReduce either
afaik). What you're looking for sounds like something more like Microsoft's
Dryad.
One thing that is supported in versions of Hadoop after 0.19 is JVM reuse.
If you enable this feature, task
ashish pareek wrote:
Yes I am able to ping and ssh between two virtual machine and even i
have set ip address of both the virtual machines in their respective
/etc/hosts file ...
thanx for reply .. if you suggest some other thing which i could
have missed or any remed
Patrick Angeles wrote:
Sorry for cross-posting, I realized I sent the following to the hbase list
when it's really more a Hadoop question.
This is an interesting question. Obviously as an HP employee you must
assume that I'm biased when I say HP DL160 servers are good value for
the workers,
hmar...@umbc.edu wrote:
Steve,
Security through obscurity is always a good practice from a development
standpoint and one of the reasons why tricking you out is an easy task.
:)
My most recent presentation on HDFS clusters is now online, notice how it
doesn't gloss over the security:
http://
Pankil Doshi wrote:
Well i made ssh with passphares. as the system in which i need to login
requires ssh with pass phrases and those systems have to be part of my
cluster. and so I need a way where I can specify -i path/to key/ and
passphrase to hadoop in before hand.
Pankil
Well, are trying
Pankil Doshi wrote:
Hello everyone,
Till now I was using same username on all my hadoop cluster machines.
But now I am building my new cluster and face a situation in which I have
different usernames for different machines. So what changes will have to
make in configuring hadoop. using same use
Bryan Duxbury wrote:
We use XFS for our data drives, and we've had somewhat mixed results.
Thanks for that. I've just created a wiki page to put some of these
notes up -extensions and some hard data would be welcome
http://wiki.apache.org/hadoop/DiskSetup
One problem we have for hard data
John Clarke wrote:
Hi,
I am working on a project that is suited to Hadoop and so want to create a
small cluster (only 5 machines!) on our servers. The servers are however
used during the day and (mostly) idle at night.
So, I want Hadoop to run at full throttle at night and either scale back or
Tom White wrote:
On Mon, May 18, 2009 at 11:44 AM, Steve Loughran wrote:
Grace wrote:
To follow up this question, I have also asked help on Jrockit forum. They
kindly offered some useful and detailed suggestions according to the JRA
results. After updating the option list, the performance did
Grace wrote:
To follow up this question, I have also asked help on Jrockit forum. They
kindly offered some useful and detailed suggestions according to the JRA
results. After updating the option list, the performance did become better
to some extend. But it is still not comparable with the Sun JV
Allen Wittenauer wrote:
On 5/15/09 11:38 AM, "Owen O'Malley" wrote:
We have observed that the default jvm on RedHat 5
I'm sure some people are scratching their heads at this.
The default JVM on at least RHEL5u0/1 is a GCJ-based 1.4, clearly
incapable of running Hadoop. We [and, r
Tom White wrote:
Hi Joydeep,
The problem you are hitting may be because port 50001 isn't open,
whereas from within the cluster any node may talk to any other node
(because the security groups are set up to do this).
However I'm not sure this is a good approach. Configuring Hadoop to
use public
Stefan Will wrote:
Yes, I think the JVM uses way more memory than just its heap. Now some of it
might be just reserved memory, but not actually used (not sure how to tell
the difference). There are also things like thread stacks, jit compiler
cache, direct nio byte buffers etc. that take up proce
zsongbo wrote:
Hi Stefan,
Yes, the 'nice' cannot resolve this problem.
Now, in my cluster, there are 8GB of RAM. My java heap configuration is:
HDFS DataNode : 1GB
HBase-RegionServer: 1.5GB
MR-TaskTracker: 1GB
MR-child: 512MB (max child task is 6, 4 map task + 2 reduce task)
But the memory u
Stefan Will wrote:
Raghu,
I don't actually have exact numbers from jmap, although I do remember that
jmap -histo reported something less than 256MB for this process (before I
restarted it).
I just looked at another DFS process that is currently running and has a VM
size of 1.5GB (~600 resident)
Arun C Murthy wrote:
... oh, and getting it to run a marathon too!
http://developer.yahoo.net/blogs/hadoop/2009/05/hadoop_sorts_a_petabyte_in_162.html
Owen & Arun
Lovely. I will now stick up the pic of you getting the first results in
on your laptop at apachecon
jason hadoop wrote:
Now that I think about it, the reverse lookups in my clusters work.
and you have made sure that IPv6 is turned off, right?
Jeff Hammerbacher wrote:
Hey Vishal,
Check out the chooseTarget() method(s) of ReplicationTargetChooser.java in
the org.apache.hadoop.hdfs.server.namenode package:
http://svn.apache.org/viewvc/hadoop/core/trunk/src/hdfs/org/apache/hadoop/hdfs/server/namenode/ReplicationTargetChooser.java?view=ma
jason hadoop wrote:
You should be able to relocate the cluster's IP space by stopping the
cluster, modifying the configuration files, resetting the dns and starting
the cluster.
Be best to verify connectivity with the new IP addresses before starting the
cluster.
to the best of my knowledge the
Grace wrote:
Thanks all for your replying.
I have run several times with different Java options for Map/Reduce
tasks. However there is no much difference.
Following is the example of my test setting:
Test A: -Xmx1024m -server -XXlazyUnlocking -XlargePages
-XgcPrio:deterministic -XXallocPrefetch
Chris Collins wrote:
a couple of years back we did a lot of experimentation between sun's vm
and jrocket. We had initially assumed that jrocket was going to scream
since thats what the press were saying. In short, what we discovered
was that certain jdk library usage was a little bit faster w
Tom White wrote:
Hi David,
The MapReduce framework will attempt to rerun failed tasks
automatically. However, if a task is running out of memory on one
machine, it's likely to run out of memory on another, isn't it? Have a
look at the mapred.child.java.opts configuration property for the
amount
Edward Capriolo wrote:
'cloud computing' is a hot term. According to the definition provided
by wikipedia http://en.wikipedia.org/wiki/Cloud_computing,
Hadoop+HBase+Lucene+Zookeeper, fits some of the criteria but not well.
Hadoop is scalable, with HOD it is dynamically scalable.
I do not think
Bradford Stephens wrote:
Hey all,
I'm going to be speaking at OSCON about my company's experiences with
Hadoop and Friends, but I'm having a hard time coming up with a name
for the entire software ecosystem. I'm thinking of calling it the
"Apache CloudStack". Does this sound legit to you all? :)
that?
log4j.appender.console.target=System.err
--
Steve Loughran http://www.1060.org/blogxter/publish/5
Author: Ant in Action http://antbook.org/
Usman Waheed wrote:
Hi All,
Is it possible to make a node just a hadoop client so that it can
put/get files into HDFS but not act as a namenode or datanode?
I already have a master node and 3 datanodes but need to execute
puts/gets into hadoop in parallel using more than just one machine other
Bill Habermaas wrote:
George,
I haven't used the Hadoop perspective in Eclipse so I can't help with that
specifically but map/reduce is a batch process (and can be long running). In
my experience, I've written servlets that write to HDFS and then have a
background process perform the map/reduce
Razen Al Harbi wrote:
Hi all,
I am writing an application in which I create a forked process to execute a
specific Map/Reduce job. The problem is that when I try to read the output
stream of the forked process I get nothing and when I execute the same job
manually it starts printing the outpu
Vishal Ghawate wrote:
Hi,
I want to store the contents of all the client machine(datanode)of hadoop
cluster to centralized machine
with high storage capacity.so that tasktracker will be on the client machine
but the contents are stored on the
centralized machine.
Can anybody he
Aaron Kimball wrote:
I'm not aware of any documentation about this particular use case for
Hadoop. I think your best bet is to look into the JNI documentation about
loading native libraries, and go from there.
- Aaron
You could also try
1. Starting the main processing app as a process on the m
Stas Oskin wrote:
Hi.
2009/4/23 Matt Massie
Just for clarity: are you using any type of virtualization (e.g. vmware,
xen) or just running the DataNode java process on the same machine?
What is "fs.default.name" set to in your hadoop-site.xml?
This machine has OpenVZ installed indeed, bu
Stas Oskin wrote:
Hi again.
Other tools, like balancer, or the web browsing from namenode, don't work as
well.
This because other nodes complain about not reaching the offending node as
well.
I even tried netcat'ing the IP/port from another node - and it successfully
connected.
Any advice on t
Aaron Kimball wrote:
Cam,
This isn't Hadoop-specific, it's how Linux treats its network configuration.
If you look at /etc/host.conf, you'll probably see a line that says "order
hosts, bind" -- this is telling Linux's DNS resolution library to first read
your /etc/hosts file, then check an exter
Jim Twensky wrote:
Yes, here is how it looks:
hadoop.tmp.dir
/scratch/local/jim/hadoop-${user.name}
so I don't know why it still writes to /tmp. As a temporary workaround, I
created a symbolic link from /tmp/hadoop-jim to /scratch/...
and it works fine now but if you t
Cam Macdonell wrote:
Well, for future googlers, I'll answer my own post. Watch our for the
hostname at the end of "localhost" lines on slaves. One of my slaves
was registering itself as "localhost.localdomain" with the jobtracker.
Is there a way that Hadoop could be made to not be so depe
Andrew Newman wrote:
They are comparing an indexed system with one that isn't. Why is
Hadoop faster at loading than the others? Surely no one would be
surprised that it would be slower - I'm surprised at how well Hadoop
does. Who want to write a paper for next year, "grep vs reverse
index"?
2
Tim Wintle wrote:
On Fri, 2009-04-03 at 09:42 -0700, Ricky Ho wrote:
1) I can pick the language that offers a different programming
paradigm (e.g. I may choose functional language, or logic programming
if they suit the problem better). In fact, I can even chosen Erlang
at the map() and Prolog
Ian Soboroff wrote:
Steve Loughran writes:
I think from your perpective it makes sense as it stops anyone getting
itchy fingers and doing their own RPMs.
Um, what's wrong with that?
It's reallly hard to do good RPM spec files. If cloudera are willing to
pay Matt to do it, not
Brian Bockelman wrote:
On Apr 2, 2009, at 3:13 AM, zhang jianfeng wrote:
seems like I should pay for additional money, so why not configure a
hadoop
cluster in EC2 by myself. This already have been automatic using script.
Not everyone has a support team or an operations team or enough tim
were
accessible under an NIO front end, then applications written for the NIO
APIs would work with the supported filesystems, with no need to code
specifically for hadoop's not-yet-stable APIs
Steve Loughran wrote:
Edward Capriolo wrote:
It is a little more natural to connect to HDFS f
Christophe Bisciglia wrote:
Hey Ian, we are totally fine with this - the only reason we didn't
contribute the SPEC file is that it is the output of our internal
build system, and we don't have the bandwidth to properly maintain
multiple RPMs.
That said, we chatted about this a bit today, and wer
Ian Soboroff wrote:
I created a JIRA (https://issues.apache.org/jira/browse/HADOOP-5615)
with a spec file for building a 0.19.1 RPM.
I like the idea of Cloudera's RPM file very much. In particular, it has
nifty /etc/init.d scripts and RPM is nice for managing updates.
However, it's for an older
Scott Carey wrote:
On 3/30/09 4:41 AM, "Steve Loughran" wrote:
Ryan Rawson wrote:
You should also be getting 64-bit systems and running a 64 bit distro on it
and a jvm that has -d64 available.
For the namenode yes. For the others, you will take a fairly big memory
hit (1.5X o
Ryan Rawson wrote:
You should also be getting 64-bit systems and running a 64 bit distro on it
and a jvm that has -d64 available.
For the namenode yes. For the others, you will take a fairly big memory
hit (1.5X object size) due to the longer pointers. JRockit has special
compressed pointers
Edward Capriolo wrote:
It is a little more natural to connect to HDFS from apache tomcat.
This will allow you to skip the FUSE mounts and just use the HDFS-API.
I have modified this code to run inside tomcat.
http://wiki.apache.org/hadoop/HadoopDfsReadWriteExample
I will not testify to how well
Oliver Fischer wrote:
Hello Vishal,
I did the same some weeks ago. The most important fact is, that it
works. But it is horrible slow if you not have enough ram and multiple
disks since all I/o-Operations go to the same disk.
they may go to separate disks underneath, but performance is bad as
jason hadoop wrote:
The exception reference to *org.apache.hadoop.hdfs.DistributedFileSystem*,
implies strongly that a hadoop-default.xml file, or at least a job.xml file
is present.
Since hadoop-default.xml is bundled into the hadoop-0.X.Y-core.jar, the
assumption is that the core jar is availa
Stuart White wrote:
The nodes in my cluster have 4 cores & 4 GB RAM. So, I've set
mapred.tasktracker.map.tasks.maximum to 3 (leaving 1 core for
"breathing room").
My process requires a large dictionary of terms (~ 2GB when loaded
into RAM). The terms are looked-up very frequently, so I want th
Karthikeyan V wrote:
There is no specific procedure for configuring virtual machine slaves.
make sure the following thing are done.
I've used these as the beginning of a page on this
http://wiki.apache.org/hadoop/VirtualCluster
jason hadoop wrote:
I am having trouble reproducing this one. It happened in a very specific
environment that pulled in an alternate sax parser.
The bottom line is that jetty expects a parser with particular capabilities
and if it doesn't get one, odd things happen.
In a day or so I will have h
e sure that they are created correctly, as there is no direct
migration of EBS to different availability zones.
View EBS as renting space in SAN and it starts to make sense.
--
Steve Loughran http://www.1060.org/blogxter/publish/5
Author: Ant in Action http://antbook.org/
Malcolm Matalka wrote:
If this is not the correct place to ask Hadoop + EC2 questions please
let me know.
I am trying to get a handle on how to use Hadoop on EC2 before
committing any money to it. My question is, how do I maintain a
persistent HDFS between restarts of instances. Most of th
jason hadoop wrote:
The other goofy thing is that the xml parser that is commonly first in the
class path, validates xml in a way that is opposite to what jetty wants.
What does ant -diagnostics say? It will list the XML parser at work
This line in the preamble before theClusterMapReduceTes
knowledge on how to solve this problem. Thanks
for any help!
===
Garhan Attebury
Systems Administrator
UNL Research Computing Facility
402-472-7761
===
--
Steve Loughran http://www.1060.org/blogxter/publish/5
Author: Ant in Action http://antbook.org/
pavelkolo...@gmail.com wrote:
On Fri, 06 Mar 2009 14:41:57 -, jason hadoop
wrote:
I see that when the host name of the node is also on the localhost
line in
/etc/hosts
I erased all records with "localhost" from all "/etc/hosts" files and
all fine now :)
Thank you :)
what does /et
Aaron Kimball wrote:
I recommend 0.18.3 for production use and avoid the 19 branch entirely. If
your priority is stability, then stay a full minor version behind, not just
a revision.
Of course, if everyone stays that far behind, they don't get to find the
bugs for other people.
* If you pla
Mar 3, 2009 at 1:16 PM, Steve Loughran wrote:
Aviad sela wrote:
Nigel Thanks,
I have extracted the new project.
However, I am having problems building the project
I am using Eclipse 3.4
and ant 1.7
I recieve error compiling core classes
*
compile-core-classes*:
BUILD FAILED
*
D:\Work
\Hadoop\build.xml:302:
java.lang.ExceptionInInitializerError
*
it points to the the webxml tag
Try an ant -verbose and post the full log, we may be able to look at the
problem more. Also, run an
ant -diagnostics
and include what it prints
--
Steve Loughran http://www.1060.org
Dan Zinngrabe wrote:
On Fri, Feb 27, 2009 at 11:21 AM, Doug Cutting wrote:
I think they're complementary.
Hadoop's MapReduce lets you run computations on up to thousands of computers
potentially processing petabytes of data. It gets data from the grid to
your computation, reliably stores outp
kang_min82 wrote:
Hello Matei,
Which Tasktracker did you mean here ?
I don't understand that. In general we have mane Tasktrackers and each of
them runs on one separate Datanode. Why doesn't the JobTracker talk directly
to the Namenode for a list of Datanodes and then performs the MapReduce
t
Tim Wintle wrote:
On Fri, 2009-02-20 at 13:07 +, Steve Loughran wrote:
I've been doing MapReduce work over small in-memory datasets
using Erlang, which works very well in such a context.
I've got some (mainly python) scripts (that will probably be run with
hadoop streaming
Wu Wei wrote:
Hi,
I used to submit Hadoop job with the utility RunJar.main() on hadoop
0.18. On hadoop 0.19, because the commandLineConfig of JobClient was
null, I got a NullPointerException error when RunJar.main() calls
GenericOptionsParser to get libJars (0.18 didn't do this call). I also
?? wrote:
Actually, there's a widely misunderstanding of this "Common PC" . Common PC
doesn't means PCs which are daily used, It means the performance of each node, can be
measured by common pc's computing power.
In the matter of fact, we dont use Gb enthernet for daily pcs' communication, we
Rasit OZDAS wrote:
Hi,
There is a JIRA issue about this problem, if I understand it correctly:
https://issues.apache.org/jira/browse/HADOOP-3743
Strange, that I searched all source code, but there exists only this control
in 2 places:
if (!(job.getBoolean("mapred.used.genericoptionsparser", fal
Sandhya E wrote:
Hi All
I prepare my JobConf object in a java class, by calling various set
apis in JobConf object. When I submit the jobconf object using
JobClient.runJob(conf), I'm seeing the warning:
"Use GenericOptionsParser for parsing the arguments. Applications
should implement Tool for t
sandhiya wrote:
Hi,
I'm using postgresql and the driver is not getting detected. How do you run
it in the first place? I just typed
bin/hadoop jar /root/sandy/netbeans/TableAccess/dist/TableAccess.jar
at the terminal without the quotes. I didnt copy any files from my local
drives into the Had
Amr Awadallah wrote:
I didn't understand usage of "malicuous" here,
but any process using HDFS api should first ask NameNode where the
Rasit,
Matei is referring to fact that a malicious peace of code can bypass the
Name Node and connect to any data node directly, or probe all data nodes for
Sandy wrote:
Since I last used this machine, Parallels Desktop was installed by the
admin. I am currently suspecting that somehow this is interfering with the
function of Hadoop (though Java_HOME still seems to be ok). Has anyone had
any experience with this being a cause of interference?
I
g XML parser on the classpath -and yet refusing to
add the four lines of code needed to handle this- then we are letting
down the users
On 2/13/09, Steve Loughran wrote:
Anum Ali wrote:
This only occurs in linux , in windows its fine.
do a java -version for me, and an ant -diagnostics, st
Anum Ali wrote:
This only occurs in linux , in windows its fine.
do a java -version for me, and an ant -diagnostics, stick both on the bugrep
https://issues.apache.org/jira/browse/HADOOP-5254
It may be that XInclude only went live in java1.6u5; I'm running a
JRockit JVM which predates that
Anum Ali wrote:
yes
On Thu, Feb 12, 2009 at 4:33 PM, Steve Loughran wrote:
Anum Ali wrote:
Iam working on Hadoop SVN version 0.21.0-dev. Having some problems ,
regarding running its examples/file from eclipse.
It gives error for
Exception in thread "
Michael Lynch wrote:
Hi,
As far as I can tell I've followed the setup instructions for a hadoop
cluster to the letter,
but I find that the datanodes can't connect to the namenode on port 9000
because it is only
listening for connections from localhost.
In my case, the namenode is called cent
Anum Ali wrote:
yes
On Thu, Feb 12, 2009 at 4:33 PM, Steve Loughran wrote:
Anum Ali wrote:
Iam working on Hadoop SVN version 0.21.0-dev. Having some problems ,
regarding running its examples/file from eclipse.
It gives error for
Exception in thread "
Stefan Podkowinski wrote:
I'm currently using OpenCSV which can be found at
http://opencsv.sourceforge.net/ but haven't done any performance
tests on it yet. In my case simply splitting strings would not work
anyways, since I need to handle quotes and separators within quoted
values, e.g. "a","a
Anum Ali wrote:
Iam working on Hadoop SVN version 0.21.0-dev. Having some problems ,
regarding running its examples/file from eclipse.
It gives error for
Exception in thread "main" java.lang.UnsupportedOperationException: This
parser does not support specification "null" version "null" at
jav
Brian Bockelman wrote:
Just to toss out some numbers (and because our users are making
interesting numbers right now)
Here's our external network router:
http://mrtg.unl.edu/~cricket/?target=%2Frouter-interfaces%2Fborder2%2Ftengigabitethernet2_2;view=Octets
Here's the application-level
Zheng Shao wrote:
We need to implement a version of Integer.parseInt/atoi from byte[] instead of
String to avoid the high cost of creating a String object.
I wanted to take the open jdk code but the license is GPL:
http://www.docjar.com/html/api/java/lang/Integer.java.html
Does anybody know an
Allen Wittenauer wrote:
On 2/9/09 4:41 PM, "Amandeep Khurana" wrote:
Why would you want to have another backup beyond HDFS? HDFS itself
replicates your data so if the reliability of the system shouldnt be a
concern (if at all it is)...
I'm reminded of a previous job where a site administrator
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