Hello everyone,
I'm working on a application that uses Cassandra and has a geolocation
component.
I was wondering beside the slides and video at
http://www.readwriteweb.com/cloud/2011/02/video-simplegeo-cassandra.php that
simplegeo published regarding their strategy if anyone has implemented g
Hallo,
assuming Ordered Partitioner I would like to have possibility to find
records by row key range and columns by slice - for example:
Give me all rows between 2001 and 2003 and all columns between A and C.
For such data:
{
2001: {A:"v1", Z:"v2"},
2002: {R:"v2", Z:"v3"},
2003: {C:"v4",
In this case, you have one query predicate that operates on a much
lower range (years) you could use it as the row key and issue a
multigetslicequery where you set all row keys and specify the slice
you're interested in (here: 2001 2002 2003, then >= "A", < "D")
On Fri, Feb 17, 2012 at 11:46 AM,
Hi!
If I run a hadoop job that uses BulkOutputFormat to write data to
Cassandra, and that hadoop job is aborted, i.e. streaming sessions are
not completed, it seems like the streaming sessions hang around for a
very long time, I've observed at least 12-15h, in output from 'nodetool
netstats'.
Hi,
we have developed a software that store logs from mail servers in MySQL,
but for huge enviroments we are developing a version that store this
data in HBase. Raw logs are, once a day, first normalized, so the output
is like this:
username,date of login, IP Address, protocol
username,date
Hi,
I've experienced several node lock-ups on EC2 instances. I'm running
with the following set-up:
heap-new: 800M
max-heap: 8G
instance type: m2.xlarge
java is
java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed m
sorry for not doing my homework properly:
http://wiki.apache.org/cassandra/FAQ#ubuntu_hangs
On Fri, Feb 17, 2012 at 2:00 PM, Pierre-Yves Ritschard
wrote:
> Hi,
>
> I've experienced several node lock-ups on EC2 instances. I'm running
> with the following set-up:
>
> heap-new: 800M
> max-heap: 8G
http://wiki.apache.org/cassandra/FAQ#ubuntu_hangs
On Fri, Feb 17, 2012 at 7:00 AM, Pierre-Yves Ritschard
wrote:
> Hi,
>
> I've experienced several node lock-ups on EC2 instances. I'm running
> with the following set-up:
>
> heap-new: 800M
> max-heap: 8G
> instance type: m2.xlarge
>
> java is
> j
Deleting the entire row at once only creates a row-level tombstone.
This is almost free. "Tombstone buildup" happens when performing
column-level deletes, then inserting more (different) columns. The
classic example is modeling a queue in a row.
On Tue, Feb 14, 2012 at 1:54 PM, Todd Burruss wro
Ok, that's clear, thank you for your time!
2012/2/16 aaron morton
> yes.
>
> -
> Aaron Morton
> Freelance Developer
> @aaronmorton
> http://www.thelastpickle.com
>
> On 16/02/2012, at 10:15 PM, R. Verlangen wrote:
>
> Hmm ok. This means if I want to have a CF with RF = 3 and anot
Are there plans to build-in some sort of map-reduce framework into Cassandra
and CQL? It seems that users should be able to apply a Java method to
selected rows in parallel on the distributed Cassandra JVMs. I believe
Solandra uses such an integration.
Don
Don,
That's a good idea, but you have to be careful not to preclude the use of
dynamic column families (e.g. CF's with time series-like schemas) which is what
Cassandra's best at. The right approach is to build your own "ORM"/persistence
layer (or generate one with some tools) that can hide th
MapReduce and Hadoop generally are pluggable so you can do queries over HDFS,
over HBase, or over Cassandra. Cassandra has good Hadoop support as outlined
here: http://wiki.apache.org/cassandra/HadoopSupport. If you're looking for a
simpler solution, there is DataStax's enterprise product whic
In response to an offline question…
There are two usage patterns for Cassandra column families, static and dynamic.
With both approaches you store objects of a given type into a column family.
With static usage the object type you're persisting has a single key and each
row in the column famil
Erik,
Currently, streaming failure handling is poorly functioning.
There are several discussions and bug reports regarding streaming failure on
jira.
Hanged streaming session will be left in memory unless you restart C*, but it
does not cause problem I believe.
--
Yuki Morishita
On Friday
ah, I missed the part about "key" cache .. I read "row" cache. thx
On 2/16/12 6:14 PM, "Jonathan Ellis" wrote:
>Look for this code in SSTableReader.getPosition:
>
>Pair unifiedKey = new
>Pair(descriptor, decoratedKey);
>Long cachedPosition = getCachedPosition(unifiedKey,
2012/2/17 Raúl Raja Martínez
> Hello everyone,
>
> I'm working on a application that uses Cassandra and has a geolocation
> component.
> I was wondering beside the slides and video at
> http://www.readwriteweb.com/cloud/2011/02/video-simplegeo-cassandra.php that
> simplegeo published regarding t
Only thing I can think of is that if you've set the cache size
manually over JMX it will preserve that size if you change it via a
schema update.
On Fri, Feb 17, 2012 at 12:10 AM, Eran Chinthaka Withana
wrote:
> Hi Jonathan,
>>
>>
>> > For some reason 16637958 (the keys cached) has become a golde
I never used JMX for any changes and use JMX only for monitoring. All my
updates goes through schema updates.
To give you little bit more context (not sure whether this will help but
anyway), about 2-3 weeks back the read latency was 4-8ms with about 90-95%
key cache hit rate. But after that point
I suspect the main difference is that 2-3 weeks ago almost none of
your reads had to hit disk.
On Fri, Feb 17, 2012 at 1:53 PM, Eran Chinthaka Withana
wrote:
> I never used JMX for any changes and use JMX only for monitoring. All my
> updates goes through schema updates.
>
> To give you little bi
True, the high hit rate has translated to low read latency. But the
question is how can I debug the reason for low hit rate now assuming read
patterns haven't changed.
Thanks,
Eran Chinthaka Withana
On Fri, Feb 17, 2012 at 3:07 PM, Jonathan Ellis wrote:
> I suspect the main difference is that
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