Thanks for BR for the quick response on this and Appreciate it.
That helps for Batch load.
If 10 million users are inserting new records at a time ( 1 record for one
user ) then how do we increase the same. My sample program assumes request
from 10 million records.
-Shankar
On Tue, Jun 9,
for a start, maybe you can see the setting use by raspberry pi project, for
instance
http://ac31004.blogspot.com/2012/05/apache-cassandra-on-raspberry-pi.html
you can look at these two files, to tune down the settings for test
environment.
cassandra-env.sh
cassandra.yaml
hth
jason
On Tue, Jun
Hello.
We are running integration tests, using real Cassandra (not a mock)
under Vagrant. MAX_HEAP_SIZE is set to 500M. As I discovered, lower
value causes 'out of memory' after some time.
Could memory usage be decreased somehow? Developers don't usually have
a lot of free RAM and performance
Il 08/06/15 20:11, Robert Coli ha scritto:
On Mon, Jun 8, 2015 at 6:58 AM, ZeroUno zerozerouno...@gmail.com
mailto:zerozerouno...@gmail.com wrote:
So... if I stop the two nodes on the first DC, restore their
sstables' files, and then restart the nodes, nothing else needs to
be done
Team,
I have a sample insert query which loads around 10 million records and
found that the insert rate is around 1500 per second. This is very slow.
The Source code I am using available at the below location. I am using the
very latest version 2.1.6 with default seetings and single node VM
Hi Shankar,
I would say:
* Prepared statements to avoid sending the whole statement with every
query and instead just send the values.
* Using session.executeAsync() to improve concurrency.
So you would start by creating a prepared statement, something like:
PreparedStatement ps =
Cassandra isn¹t great at ad hoc queries. Many of us have paired it with an
indexing engine like SOLR or Elastic Search.
(built-into the DSE solution)
As of late, I think there are a few of us exploring Spark SQL. (which you
can then use via JDBC or REST)
-brian
---
Brian O'Neill
Chief
Hi Eax,
are you truncating/dropping tables between tests? Are your issues perhaps
related to that?
If you are, you should disable autoSnapshots and enable -DunsafeSystem=true
to make it run smoother.
kind regards,
Christian
On Tue, Jun 9, 2015 at 11:25 AM, Jason Wee peich...@gmail.com wrote:
Hi All,
I have an web application running with my backend data stored in
cassandra. Now I want to do some analysis on the data stored which
requires some ad-hoc queries fired on cassandra. How can I do the same?
Regards,
Seenu.
Hello,
Do you have your clocks synced across your cluster? Are you using NTP and
have it properly configured?
Sometimes clock out of sync can trigger weird behaviour.
Regards,
Carlos Juzarte Rolo
Cassandra Consultant
Pythian - Love your data
rolo@pythian | Twitter: cjrolo | Linkedin:
cool , thank you for the suggestion.
2015-06-09 17:40 GMT+02:00 Carlos Rolo r...@pythian.com:
(Some self-promotion here)
You can follow this blog to help you out:
http://www.pythian.com/blog/from-0-to-cassandra-an-exhaustive-approach-to-installing-cassandra/
Regards,
Carlos Juzarte Rolo
Ok thank you very much. I got my answer :)
2015-06-09 17:34 GMT+02:00 Alex Popescu al...@datastax.com:
The JVM is the runtime platform for Cassandra. You can use any driver with
it (there's no default driver). DataStax provides quite a few open source
drivers [1] and there are also community
Any suggestions or comments on this one?
Thanks
Anuj Wadehra
Sent from Yahoo Mail on Android
From:Anuj Wadehra anujw_2...@yahoo.co.in
Date:Sun, 7 Jun, 2015 at 1:54 am
Subject:Hundreds of sstables after every Repair
Hi,
We are using 2.0.3 and vnodes. After every repair -pr operation 50+
I think this came up recently in another thread. If you're getting large
numbers of SSTables after repairs, that means that your nodes are diverging
from the keys that they're supposed to be having. Likely you're dropping
mutations. Do a nodetool tpstats on each of your nodes and look at the
We were facing dropped mutations earlier and we increased flush writers. Now
there are no dropped mutations in tpstats. To repair the damaged vnodes /
inconsistent data we executed repair -pr on all nodes. Still, we see the same
problem.
When we analyze repair logs we see 2 strange things:
hey there,
In order to install cassandra, java has to be installed first. is that mean
that the default driver of cassandra is java? what if we wanna use the cpp
driver?
P.S 1: my questions might be so dump, but I will really appreciate an
answer.
PS 2: I'm intern and i'm completely new to
The JVM is the runtime platform for Cassandra. You can use any driver with
it (there's no default driver). DataStax provides quite a few open source
drivers [1] and there are also community maintained drivers [2]
[1]: https://github.com/datastax/
[2]:
Hi,
Not sure why this isn't working. Some thoughts, just in case:
- Have you check the files rights / owner ?
- Have you tried copying files after directory creation through your cqlsh
-f schema step ?
- Have you tried without setting tokens manually ?
- Are you sure to put the right sstables at
Yes. We use NTP. We also thought that drift is creating problems. Our NTP
Output is as under:
[root@node1 ~]# ntpq -p
remote refid st t when poll reach delay offset jitter
==
+10.x.x.x
Quick update, saw the same error on another new node, again the node isn't
really misbehaving uptill now.
Thanks
On Mon, Jun 8, 2015 at 9:48 PM, Aiman Parvaiz ai...@flipagram.com wrote:
Hi everyone
I am running C* 2.0.9 and decided to do a rolling upgrade. Added a node of
C* 2.0.15 in the
On Tue, Jun 9, 2015 at 6:32 AM, Anton Koshevoy nowa...@gmail.com wrote:
- /etc/init.d/cassandra restart
Cassandra reads and makes live any files it finds in its data directory. If
you write to the keyspace and flush, is it flushing the new file in the
directory you've put your sstable in?
In my experience, you don’t want to do streaming operations (repairs or
bootstraps) with mixed Cassandra versions. Upgrade the ring to the new version,
and then add nodes (or add the nodes at the current version, and then upgrade).
Sean Durity
From: Aiman Parvaiz [mailto:ai...@flipagram.com]
On Tue, Jun 9, 2015 at 1:48 AM, ZeroUno zerozerouno...@gmail.com wrote:
As far as I read from the docs, bootstrapping happens when adding a new
node to the cluster, but in my situation the nodes already exist, I'm only
adding data back into them.
If you don't have the contents of the system
With the upcoming release of Cassandra-2.2 Windows is finally an officially
supported operating system. While many months of JIRA tickets
https://issues.apache.org/jira/issues/?filter=-1jql=project%20%3D%20cassandra%20and%20labels%20%3D%20Windows,
bug fixes, and contributions have gone into making
On Tue, Jun 9, 2015 at 2:35 PM, Aiman Parvaiz ai...@flipagram.com wrote:
Thanks Sean, in this scenario also I would end up running 2 versions of
Cassandra as I am planning to do a rolling upgrade and hence zero downtime.
Upgrading in place one node at a time would lead to running 2 versions,
Thanks Sean, in this scenario also I would end up running 2 versions of
Cassandra as I am planning to do a rolling upgrade and hence zero downtime.
Upgrading in place one node at a time would lead to running 2 versions,
please let me know if I am missing something here.
On Tue, Jun 9, 2015 at
what do you mean by ad-hoc queries?
Do you mean simple queries against a single column family aka table?
Or do you mean MDX style queries that looks at multiple tables?
if it's MDX style queries, many people extract data from Cassandra into a
data warehouse that support multi-dimensional cubes.
Thanks guys for the inputs.
By ad-hoc queries I mean that I don't know the queries during cf design
time. The data may be from single cf or multiple cf. (This feature maybe
required if I want to do analysis on the data stored in cassandra, do you
have any better ideas)?
Regards,
Seenu.
On
Ok, new sequence:
….
- rm -rf /db/cassandra/cr/data0*/system/*
- /etc/init.d/cassandra start
- cqlsh -f schema(here is the schema for cr_production keyspace only)
- /etc/init.d/cassandra restart
I see the new keyspace, but it’s empty:
cqlsh describe keyspaces;
system_traces cr_production
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