R u using hector client for java
On Tue, Jul 26, 2011 at 11:17 PM, Priyanka wrote:
> this is how my data looks
> “rowkey1”:{
>“supercol1”:{ “col1”:T,”col2”:C}
>“supercol2”:{“col1”:C,”col2”:T }
>“supercol3”:{ “col1”:C,”col2”:T}
>}
> "rowkey2”:{
Hi,
My Question is regarding security.
The data will be written in the disks in strings right! then how come the
data is secured, Is it not secured ???
Hi,
Can we store images , java objects, files in cassandra, if so , how
Please let me know this as i need it urgently...
Hi,
I am having one doubt regarding reads. The data will be stored in
commitlog,memtable,sstables right.. While reading the data may be available
in all the three right, then from where the reads happens,, form commit log?
or from Memtable ? or from SSTables.. Please explain friends
Thnks
You can store anything you like in Cassandra. The type of data is not
relevant as there are no types in Cassandra, they all get stored as byte
arrays. The only relevant limit is a column value cannot exceed 2GB (see
http://wiki.apache.org/cassandra/CassandraLimitations).
In terms of how: you just
Out of the box there is no security turned on but there are a number of
options: http://wiki.apache.org/cassandra/StorageConfiguration,
http://wiki.apache.org/cassandra/ExtensibleAuth
If you are worried about storing data in clear text then you should encrypt
it before storage.
This kind of information is very helpful.
Thank you to share your experience.
maki
2011/7/27 Teijo Holzer :
> Hi,
>
> I thought I share the following with this mailing list as a number of other
> users seem to have had similar problems.
>
> We have the following set-up:
>
> OS: CentOS 5.5
> RAM:
All:
What does the following error mean? One of my cassandra servers print
this error, and nodetool shows the state of the server is down. Netstat
result shows the socket number is very few.
WARN [main] 2011-07-27 16:14:04,872 CustomTThreadPoolServer.java (line
104) Transport error occurred du
Thanks for the response Oliver,
Can you please let me know where can i find an example for storing images
and files. I could not able to find one in tht link. Please let me know
On Wed, Jul 27, 2011 at 1:48 PM, Oliver Dungey wrote:
> You can store anything you like in Cassandra. The type of data
I zip last version of cassandra with yaml file and 37gb database, can
anybody download and do major compaction to check what is wrong? and why
cassandra fall in outofmemory exception. Tanks!
here is link to download
http://213.186.117.181/apache-cassandra-0.8.2-bin.zip
Yes am using hector for java
On Wed, Jul 27, 2011 at 3:35 AM, CASSANDRA learner <
cassandralear...@gmail.com> wrote:
> R u using hector client for java
>
>
> On Tue, Jul 26, 2011 at 11:17 PM, Priyanka wrote:
>
>> this is how my data looks
>> “rowkey1”:{
>>“supercol1”:{ “col1”:T,”col2
> What does the following error mean? One of my cassandra servers print this
> error, and nodetool shows the state of the server is down. Netstat result
> shows the socket number is very few.
The operating system enforced limits have been hit, so Cassandra is
unable to create additional file descr
Why when i give jvm 1 GB heap size and try launch cassandra with 37GB
database, cassandra start loading database, but after memory usage full,
they fall with OutOfMemory Exception. Cassandra can`t work with low memory?
or she critical need more RAM if database grows?
here is link to download cassnd
Hi,
I was just experiencing that when i do an IndexSliceQuery with the index column
not in the slicerange the index column will be returned anyways. Is this
behavior intended or is it a bug (if so - is it a Cassandra bug or a hector
bug)?
I am using Cassandra 0.7.7 and hector 0.7-26
Greetings,
u should take a look at this
http://www.datastax.com/docs/0.7/troubleshooting/index
@dil
2011/7/27 Donna Li
> All:
>
> What does the following error mean? One of my cassandra servers print this
> error, and nodetool shows the state of the server is down. Netstat result
> shows the socket
Hi!
Need set memtable_troughput for cassandra
I try do this with help cassandra-cli by write this command
"update column family columnfamily2 memtable_troughput=155;"
but i get error
"missing EOF at memtable_troughput"
help! how i can set attribute memtable_troughput?
On Wed, Jul 27, 2011 at 7:40 AM, lebron james wrote:
> Why when i give jvm 1 GB heap size and try launch cassandra with 37GB
> database, cassandra start loading database, but after memory usage full,
> they fall with OutOfMemory Exception. Cassandra can`t work with low memory?
> or she critical n
Hi,
The question I am asking is a bit about the design of a data access
objects layer on top of a cassandra datastore.
I had a look at project Kundera which basically implies JPA approach
by creating POJOs and mapping them through annotations. Looks
promising but what if I would like to have new
from ROW CACHE {if enabled} -->KEY CACHE-->MEMTABLE-->SSTABLE
On Wed, Jul 27, 2011 at 1:19 PM, CASSANDRA learner <
cassandralear...@gmail.com> wrote:
> Hi,
>
> I am having one doubt regarding reads. The data will be stored in
> commitlog,memtable,sstables right.. While reading the data may be ava
Speaking from personal experience (and believe me it all comes down to this) we
attempted a DAO approach as well. However, we found that based upon all the
mutator.addInsertion()s we were creating across column families everything
ended up in the same DAO - we only have 3 main Column Families th
The main advantage to that is, If you kill it without -9 it will make
sure to let the commitlog flush and fsync first, if you've been using
periodic sync (the default).
On Wed, Jul 27, 2011 at 1:31 AM, wrote:
> A simple kill without -9 should work. Have you tried that?
>
> On , Jason Pell wrote
Sounds like a Cassandra bug to me.
On Wed, Jul 27, 2011 at 6:44 AM, Roland Gude wrote:
> Hi,
>
> I was just experiencing that when i do an IndexSliceQuery with the index
> column not in the slicerange the index column will be returned anyways. Is
> this behavior intended or is it a bug (if so – i
Thanks Anthony. Following your comments, I searched for a similar
approach using command pattern. http://code.google.com/p/casemate
seems a way of doing that.
On 27 July 2011 18:23, Ikeda Anthony wrote:
> Speaking from personal experience (and believe me it all comes down to this)
> we attempted
typo in >> memtable_troughput
"update column family columnfamily2 memtable_troughput=155;"
"update column family columnfamily2 memtable_throughput=155;"
On Wed, Jul 27, 2011 at 9:59 AM, lebron james wrote:
> Hi!
> Need set memtable_troughput for cassandra
> I try do this with help cassandra-cl
For our current project we have decided to use Hector as the client API,
however, with the introduction of CQL I need to understand a few things.
Firstly, CQL use SQL like constructs. Column names seem to be limited to the
same constraints of SQL (restricted use of delimiters) and yet the strength
You might want to avoid super columns and denormalize your schema...
Since you are querying by the supercoumns... you can make them the rowkeys
and current rowkeys can be your column names.. and using composite column
names to get to the columns faster.
Something like this (used your representation
CASSANDRA learner wrote:
>
> Hi,
>
> Can we store images , java objects, files in cassandra, if so , how
> Please let me know this as i need it urgently...
>
Look at http://goo.gl/S2E3C http://goo.gl/S2E3C
It really depends on your workload. With heavy workloads cassandra is not
the rig
sorry, i dont understand, what right syntax to set memtable_throughput?
>
Try help on the CLI for how to do it, specifically "help update column family;"
It looks like you're missing the "with."
update column family columnfamily2 memtable_throughput=155;
should be
update column family columnfamily2 with memtable_throughput=155;
On Jul 27, 2011, at 12:49 PM, lebron j
Thank you Indra for your suggestion.
But the thing is apart from pulling data based on supercol in the below
example I also need to query to pull the data based on a particular
rowkey.If I change the model as u mentioned this query becomes slow.
I need to do both the retrievals efficiently.
--
Vie
The philosophy in no-sql is to store the data as you plan to access it. that
means duplicating the data many time possibly. Disk is cheap, writes are
fast.
On Wed, Jul 27, 2011 at 2:22 PM, Priyanka wrote:
> Thank you Indra for your suggestion.
> But the thing is apart from pulling data based o
I had a quick look at DAO and my common uses case is, row names
appearing as column ID's elsewhere (indexes etc). I also wanted to track
deltas at a column level and have a reasonable sized client side cache.
I ended up with two abastract DAO's, one for Column Family, one for
Super column factory,
I have a current 0.6.x cluster in a single datacenter with RackUnaware and
am looking to expand into a second data center. I know I need to change to
RackAwareStrategy however, I'm not sure what will happen to my data when I
restart the nodes in the current cluster before I even add the new DC. Wil
As you know, with 0.6 adding a datacenter is not as easy as 0.7 with
NetworkTopologyStrategy. With 0.6 there is a right way that will work
with some manual effort, and a wrong way that can cause you major pain
and grief.
The right way:
- Switch to a DC-aware snitch but leave your cluster on RUS t
Notice how users react to these things. At one point for example we decided
to add a ';' to the CLI.
http://www.amazon.com/Cassandra-Definitive-Guide-Eben-Hewitt/dp/1449390412
The initial chapters on downloading and installing the product get the
reader started using Cassandra immediately. Then t
On Wed, Jul 27, 2011 at 10:53 PM, Edward Capriolo wrote:
> You can not even put two statements on the same line. So the ';' is semi
> useless syntax.
Nobody ever asked for that, but lots of people asked to allow
statements spanning multiple lines.
> Is their a way to move things forward without
On Thu, Jul 28, 2011 at 12:01 AM, Jonathan Ellis wrote:
> On Wed, Jul 27, 2011 at 10:53 PM, Edward Capriolo
> wrote:
> > You can not even put two statements on the same line. So the ';' is semi
> > useless syntax.
>
> Nobody ever asked for that, but lots of people asked to allow
> statements spa
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