You're likely to get a better response if you post your error messages and
example code that reproduces the problem. :)
Best,
Dave
On Tue, Jun 19, 2012 at 12:27 AM, Ben Cuthbert wrote:
> All
>
> We have our application server running in Java 7 and hbase started and
> running on Java 6 using the
Here's a good starting point:
http://hbase.apache.org/book.html#store.memstore , I think you
misunderstand what a memstore is.
Good luck!
-Dave
On Wed, Jun 13, 2012 at 10:50 AM, ashdamle wrote:
>
> Hello. This is my first post here. I've setup hbase with 2 column families
> 2GB heap size with
Have you verified that your nodes are not swapping? This has caused serious
issues for many people, including me.
Swapping can occur even if you have lots of available memory, for
complicated reasons.
Best,
Dave
On Thu, May 24, 2012 at 4:39 PM, Stack wrote:
> On Thu, May 24, 2012 at 4:15 AM, E
Here's what I do:
Scan scan = new Scan(...)
scan.setCaching(5000);
scan.setWhatever(...);
TableMapReduceUtil.initTableMapperJob(tablename, scan, mapClass,
mapOutKeyClass, mapOutValueClass, job);
Does that help?
-Dave
On Fri, May 25, 2012 at 11:03 AM, Ey-Chih chow wrote:
>
On Wed, May 23, 2012 at 6:15 AM, Takahiko Kawasaki <
takahiko.kawas...@jibemobile.jp> wrote:
> Hello,
>
> I'm a newbie and wondering whether or not there is any restriction during
> HBase minor/major compactions. I read the online document but could not
> find any explicit mention about restrictio
>
> 1. HBase guarantees data locality of store files and Regionserver only if
> it stays up for long. If there are too many region movements or the server
> has been recycled recently, there is a high probability that store file
> blocks are not local to the region server. But the getSplits comman
Many people will probably try to use coprocessors as a way of implementing
app logic on top of HBase without the headaches of writing a daemon.
Sometimes client-side approaches are inadvisable; for example, there may be
several client languages/runtimes and the app logic should not be
reimplemented
On May 15, 2012, at 7:10 AM, Leon Mergen wrote:
> Hello all,
>
> We are currently orienting on HBase as a possible way to store our log data
> in a structured way, and I want to verify a few things I was not able to
> find online. Specifically, what we are trying to achieve:
>
> * be able to quic
Re: your question #1, you won't be able to pass information from mappers to
reducers by using static variables. Since map tasks run in different JVM
instances than reduce tasks, the value of the static variable will never be
sent from the mapper JVM to the reducer JVM.
It might work in standalone
Hi Narenda,
There are some shared static data structures inside the HBase client that
are keyed on Configuration objects. Do you reuse the same Configuration
object everytime you instantiate an HTable? By reusing the same
Configuration objects you may cause ZooKeeper connections to be reused.
I'm
Many mapreduce algorithms require a reduce phase (e.g. sorting)'
>
> Ok. So tell me why you would want to sort your input in to HBase and if
> that's really a good thing?
> Oops!... :-)
>
>
>
>
>
>
> On May 10, 2012, at 12:31 PM, Dave Revell wrote:
> &
This "you don't need a reducer" conversation is distracting from the real
problem and is false.
Many mapreduce algorithms require a reduce phase (e.g. sorting). The fact
that the output is written to HBase or somewhere else is irrelevant.
-Dave
On Thu, May 10, 2012 at 6:26 AM, Michael Segel wrot
+1 Jack :)
On Tue, Apr 17, 2012 at 11:38 AM, Stack wrote:
> On Tue, Apr 17, 2012 at 11:18 AM, Dave Revell
> wrote:
> > I think this is a popular topic that might deserve a section in The Book.
> >
> > By "this topic" I mean storing big binary chunks.
> &g
I think this is a popular topic that might deserve a section in The Book.
By "this topic" I mean storing big binary chunks.
-Dave
On Tue, Apr 17, 2012 at 11:07 AM, kim young ill wrote:
> i plan to move some data from relational-db to hbase, most of them are
> binary with some hundreds KBs, woul
Bam! http://ofps.oreilly.com/titles/9781449396107/performance.html ,
search for "merging regions"
Zamo! https://issues.apache.org/jira/browse/HBASE-1621
Cheers,
Dave
On Fri, Sep 9, 2011 at 9:54 AM, Geoff Hendrey wrote:
> Hi -
>
>
>
> I think we're in a situation where we have too many regions (
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