Hi All,
I am using Hector client for cassandra . I wanted to know how to create
keyspace and column family using API's to read and write data.
or i have to create keyspace and column family manually using command line
interface.
Regards
Arshad
In Hector when you create a cluster using the API, you specify an IP address
cluster name. Thereafter internally which node serves the request or how many
nodes need to be contacted to read/write data depends on the cluster
configuration i.e. Whats your replication strategy, factor,
Thank you for the reply.
Now I have decommissioned a node but now I don't know how to recommission it
.Please help me
Thanks and Regards
Prakrati Agrawal | Developer - Big Data(ID)| 9731648376 | www.mu-sigma.com
-Original Message-
From: Roshni Rajagopal
Dear all
I decommissioned a node. Now I want to make that node a part of the ring again.
How do I do it? Please help me
Thanks and Regards
Prakrati Agrawal | Developer - Big Data(ID)| 9731648376 | www.mu-sigma.com
This email message may contain proprietary,
Mina,
That does not sound right.
If you have the time can you create a jira ticket describing the
problem, please include:
* the GC logs gathered by enabling them here
https://github.com/apache/cassandra/blob/trunk/conf/cassandra-env.sh#L165 (It
would be good to see the node
Hi All,
I am using Hector as a client in cassandra.And iam trying to create Keyspace
using the following API's
Keyspace keyspace = HFactory.createKeyspace(test, cluster);
but it showing the following error:
caused by: InvalidRequestException(why:Keyspace test does not exist)
can any body help
Hi,
the Javadoc (or source code) of the me.prettyprint.hector.api.factory.HFactory
class contains all the examples to create keyspaces and column families.
To create a keyspace:
String testKeyspace = testKeyspace;
KeyspaceDefinition newKeyspace =
You have to create the keyspace manually first using Cassandra cli
Prakrati Agrawal | Developer - Big Data(ID)| 9731648376 | www.mu-sigma.com
From: MOHD ARSHAD SALEEM [mailto:marshadsal...@tataelxsi.co.in]
Sent: Wednesday, June 06, 2012 2:27 PM
To: user@cassandra.apache.org
Subject: how to
I looked through the log again. Still looks like it's overloaded and not
handling the overload very well.
It looks like a sustained write load of around 280K columns every 5 minutes for
about 5 hours. It may be that the CPU is the bottle neck when it comes to GC
throughput. You are hitting
Dear all
I was originally having a 1 node cluster. Then I added one more node to it with
initial token configured appropriately. Now when I run my queries I am not
getting all my data ie all columns.
Output on 2 nodes
Time taken to retrieve columns 43707 of key range is 1276
Time taken to
Dear all
I am trying to evaluate the performance of Cassandra and wrote a code to
retrieve a complete row ( having 43707 columns) using Thrift and Hector.
The thrift client code took 0.767 seconds while Hector code took 0.883 seconds
. Is it expected that Hector will be slower than Thrift? If
Hector is a higher-level client that provides some abstraction and an easy
to use interface. The Thrift API is pretty raw. So for most cases the
Hector client would be the best choice; except for use-cases where the
ultimate performance is a requirement (resulting in lots of more
maintenance
You are basically in trouble. If you can nuke it and start again it would be
easier. If you want to figure out how to get out of it keep the cluster up and
have a play.
-What I think the solution should be:
You want to get repair to work before you start deleting data.
At ~840GB I'm
Please anyone reply to my query
Prakrati Agrawal | Developer - Big Data(ID)| 9731648376 | www.mu-sigma.com
From: Prakrati Agrawal [mailto:prakrati.agra...@mu-sigma.com]
Sent: Wednesday, June 06, 2012 2:34 PM
To: user@cassandra.apache.org
Subject: Cassandra not retrieving the complete data on 2
Hi,
After creating the keyspace successfully now i want to know how to read write
data using API,s
Regards
Arshad
From: Filippo Diotalevi [fili...@ntoklo.com]
Sent: Wednesday, June 06, 2012 2:27 PM
To: user@cassandra.apache.org
Subject: Re: Query
Hi,
the Javadoc
Dear all,
I had a 1 node cluster. Then I added 1 more node to it.
When I ran my query on 1 node cluster I got all my data but when I ran my query
on the 2 node cluster (Hector code) I am not getting the same data.
How do I ensure that my Hector code retrieves data from all the nodes.
Also when
--
Cyril SCETBON
On 6/6/12 12:13 PM, Cyril Scetbon wrote:
sorry for that
--
Cyril SCETBON
Did you run repair on the new node?
2012/6/6 Prakrati Agrawal prakrati.agra...@mu-sigma.com
Dear all,
** **
I had a 1 node cluster. Then I added 1 more node to it. ** **
When I ran my query on 1 node cluster I got all my data but when I ran my
query on the 2 node cluster (Hector
What does repair do?
Prakrati Agrawal | Developer - Big Data(ID)| 9731648376 | www.mu-sigma.com
From: R. Verlangen [mailto:ro...@us2.nl]
Sent: Wednesday, June 06, 2012 3:56 PM
To: user@cassandra.apache.org
Subject: Re: Problem in getting data from a 2 node cluster
Did you run repair on the new
When I run the nodetool command I get the following information
./nodetool -h localhost ring
Address DC RackStatus State Load
Effective-Owership Token
Repair ensures that all data is consistent and available on the node.
2012/6/6 Prakrati Agrawal prakrati.agra...@mu-sigma.com
When I run the nodetool command I get the following information
./nodetool -h localhost ring
Address DC RackStatus State Load
Yes I ran nodetool repair also. Still the same problem I am getting lesser data
when using my code on a 2 node cluster. Please help me
Prakrati Agrawal | Developer - Big Data(ID)| 9731648376 | www.mu-sigma.com
From: R. Verlangen [mailto:ro...@us2.nl]
Sent: Wednesday, June 06, 2012 4:01 PM
To:
I even used CassandraHostConfigurator and added a string of hosts but still the
same issue. Please someone help me
Thanks and Regards
Prakrati Agrawal | Developer - Big Data(ID)| 9731648376 | www.mu-sigma.com
From: Prakrati Agrawal [mailto:prakrati.agra...@mu-sigma.com]
Sent: Wednesday, June
I will repeat my query once again:
I had a 1 node cluster. Then I added 1 more node to it.
When I ran my query on 1 node cluster I got all my data but when I ran my query
on the 2 node cluster (Hector code) I am not getting the same data.
How do I ensure that my Hector code retrieves data from
Hi,
You can find detailed info here [1]
[1] https://github.com/hector-client/hector/wiki/User-Guide
regards
On Wed, Jun 6, 2012 at 3:38 PM, MOHD ARSHAD SALEEM
marshadsal...@tataelxsi.co.in wrote:
Hi,
After creating the keyspace successfully now i want to know how to read
write data using
On Wed, 2012-06-06 at 06:54 -0500, Prakrati Agrawal wrote:
This node will not auto bootstrap because it is configured to be a
seed node
This means the cassandra.yaml on that node references itself as a seed
node.
After you decommission the second node, can you still access the entire
dataset
Hi,
We are testing Cassandra and tried to remove a node from the cluster using
nodetool decomission. The node transferred the data, then died for about
20 minutes without responding, then came back to life with a load of
50-100, was in a heavy load during about 1 hour and then returned to normal
Hi..
the link http://thelastpickle.com/2011/05/04/How-are-Memtables-measured/
mentions that From version 0.7 onwards the worse case scenario is up
to CF Count + Secondary Index Count + memtable_flush_queue_size
(defaults to 4) + memtable_flush_writers (defaults to 1 per data
directory) memtables
Also, Could someone please explain how the factor of 7 comes in the
picture in this sentence
For example if memtable_total_space_in_mb is 100MB, and
memtable_flush_writers is the default 1 (with one data directory), and
memtable_flush_queue_size is the default 4, and a Column Family has no
Hello All,
How do I initialize Astyanax inside an EJB Stateless bean, which I am
using to implement DAO?
Thanks
ben.jamin
Thanks for the tips
Some things I found looking around:
grepping the logs for a specific repair I ran yesterday:
/var/log/cassandra# grep df14e460-af48-11e1--e9014560c7bd system.log
INFO [AntiEntropySessions:13] 2012-06-05 19:58:51,303 AntiEntropyService.java
(line 658) [repair
On Wed, Jun 6, 2012 at 2:49 AM, Juan Ezquerro LLanes arr...@gmail.comwrote:
El martes, 5 de junio de 2012 19:19:02 UTC+2, Tyler Hobbs escribió:
The Cassandra users mailing list is a better place for this question, so
I'm moving it there.
Hi, I need a phpcassa compatible solution .
what is your consistency level?
From: Prakrati Agrawal [mailto:prakrati.agra...@mu-sigma.com]
Sent: Wednesday, June 06, 2012 4:58 AM
To: user@cassandra.apache.org
Subject: RE: Cassandra not retrieving the complete data on 2 nodes
Please anyone reply to my query
Prakrati Agrawal | Developer -
In addition to using a low consistency level, it sounds like you didn't
bootstrap the node or run a repair after it joined the ring.
On Wed, Jun 6, 2012 at 12:41 PM, Poziombka, Wade L
wade.l.poziom...@intel.com wrote:
what is your consistency level?
** **
*From:* Prakrati Agrawal
Just to check, do you have JNA setup correctly? (You should see a couple of
log messages about it shortly after startup.) Truncate also performs a
snapshot by default.
On Wed, Jun 6, 2012 at 12:38 PM, Poziombka, Wade L
wade.l.poziom...@intel.com wrote:
**
However, after all the work I
I believe so. There are no warnings on startup.
So is there a preferred way to completely eliminate a column family?
From: Tyler Hobbs [mailto:ty...@datastax.com]
Sent: Wednesday, June 06, 2012 1:17 PM
To: user@cassandra.apache.org
Subject: Re: memory issue on 1.1.0
Just to check, do you have
It depends on what you mean by remove (background info here
http://www.datastax.com/docs/1.0/operations/cluster_management )
If you use nodetool decomission or nodetool removetoken the data will be
redistributed.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
The client does not have to know where the data is, thats what the cluster
works out see
http://www.datastax.com/docs/1.0/cluster_architecture/about_client_requests
Now I have decommissioned a node but now I don't know how to recommission it
.Please help me
You can use the CLI http://www.datastax.com/docs/1.0/dml/using_cli or CQL
http://www.datastax.com/docs/1.0/dml/using_cql
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 6/06/2012, at 9:00 PM, Prakrati Agrawal wrote:
You have to create
Take a look in the logs for .185 and check for errors.
Run node tool ring from node .62 to see if it thinks .185 is in the ring.
if all looks good, try to decomission again.
Cheers
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 7/06/2012, at
You question was
Could you please throw light on the what conditions does
MeteredFlusher use to trigger memtable flushes.
The answer is estimates of the ratio between the live size and the serialised
size of memtables are kept. The MeteredFlusher periodically checks the
serialised size of all
use drop.
truncate is mostly for unit tests.
A
-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 7/06/2012, at 6:22 AM, Poziombka, Wade L wrote:
I believe so. There are no warnings on startup.
So is there a preferred way to completely
Another little question:
I just added some EBS volumes to the nodes that are particularly choked and I
am now running major compactions on those nodes (and all is well so far). Once
everything gets back down to a normal size, can I move all the data back off
the ebs volumes?
something along
On Tue, Jun 5, 2012 at 4:30 PM, Jim Ancona j...@anconafamily.com wrote:
It might be a good idea for the documentation to reflect the tradeoffs
more clearly.
Here's a proposed addition to the Secondary Index FAQ at
http://wiki.apache.org/cassandra/SecondaryIndexes
Q: How does choice of
Hi All,
On SuSe Linux blade with 6GB of RAM.
with disk_access_mode mmap_index_only and mmap I see OOM map failed error
on SSTableBatchOpen thread. cat /proc/pid/maps shows a peak of 53521
right before it dies. vm.max_map_count = 1966080 and /proc/pid/limits
shows unlimited locked memory.
with
U can use Astyanax API. These sort minor issues are resolved in that API.
Regards,
Abhijit
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