Jack,
This is one of the analytics jobs i have to run. For the given problem, i
want to optimize the schema so that instead of loading the data as rdd to
spark machines , i want to get the direct number from cassandra queries.
The rationale behind this logic is i want to save on spark machine types
Thank you all for your feedback.
I and my team will take all these suggestions into account.
Cheers
Enrico
Il giorno Mar 26 Gen 2016 23:51 Jack Krupansky
ha scritto:
> There is no documented support for embedded Cassandra. Sure, there is a
> CassandraDaemon class and a EmbeddedCassandraService
Hi Alain and Romain,
I am so sorry for this issue! I should not use the command "nodetool move"
because I set "num_tokens: 256" in every node's cassandra.yaml.
However, I have new questions after adding two nodes into the cluster:
node1: 192.21.0.184
node2: 192.21.0.185
After starting the two n
There is no documented support for embedded Cassandra. Sure, there is a
CassandraDaemon class and a EmbeddedCassandraService class, but they are
intended for testing, not for use of the product.
I have seen a couple of (old) references to people running embedded
Cassandra (one in the official Wiki
Sam, Paulo,
Thank you very much for explanations and references.
Oleg
On Mon, Jan 25, 2016 at 10:08 AM, Sam Tunnicliffe wrote:
> Paulo is correct in saying that C* doesn't have a direct equivalent of
> SecurityContextHolder. Authenticated principal info is retrievable from the
> QueryState dur
Launching a distributed database inside of an application server does not
make it easier to manage, it makes it a nightmare.
Rebooting a node is easy, rebooting ALL your nodes when you do a deployment
is pointless.
On Tue, Jan 26, 2016 at 2:14 PM Enrico Olivelli wrote:
> Hanks for your replies.
Hanks for your replies.
Actually my service uses a traditional jdbc database which is to be shared
among all the peers. I'm looking for a shared-nothing db and Cassandra
seems good.
I'm already using HBase in production but it seems to me that Cassandra is
more dynamic. No need for distributed fs l
Hi,
On Tue, Jan 26, 2016 at 8:28 AM, Julien Anguenot
wrote:
> If you install the latest OpsCenter you will get a banner stating the
> policy changes and linking to:
>
>http://docs.datastax.com/en/opscenter/5.2/opsc/opscPolicyChanges.html
>
> On our side, we decided to go with Sematext SPM to
For the sake of argument... why do you think you should embed Cassandra?
I'll be honest with you, making Cassandra restart every time you want to
upgrade your daemon sounds like a horrible idea.
Run your 10 DB instances on their own and save yourself the operational
headache.
On Tue, Jan 26, 2016
Step 1 in data modeling in Cassandra is to define all of your queries. Are
these in fact the ONLY queries that you need?
If you are doing significant analytics, Spark is indeed the way to go.
Cassandra works best for point queries and narrow slice queries (sequence
of consecutive rows within a si
Hi Dillon,
CMIIW I suspect that you use vnodes and you want to "move one of the 256 tokens
to another node". If yes, that's not possible."nodetool move" is not allowed
with vnodes:
https://github.com/apache/cassandra/blob/cassandra-2.1.11/src/java/org/apache/cassandra/service/StorageService.j
I'm certain you're going to get a lot of users on this mailing list telling
you that's a bad idea. You should read up on Cassandra via datastax website
to understand how Cassandra is designed and works.
There's tools for monitoring and more.
On Tue, Jan 26, 2016 at 2:31 PM, Enrico Olivelli
wrote
Hi,
I' new to Cassandra. I'm evaluating to launch Cassandra daemon inside the
JVM of my program. This is essentially because I want the lifecycle of
Cassandra to be managed by my daemon.
My program can be launched on several machines (in the order of max 10
instances) and every instance collaborate
There's still a race condition there, because two clients could SELECT at
the same time as each other, then both INSERT.
You'd be better served with a CAS operation, and let Paxos guarantee
at-most-once execution.
On Tue, Jan 26, 2016 at 9:06 AM Francisco Reyes wrote:
> On 01/22/2016 10:29 PM,
DataStax has a free program for startups
http://www.datastax.com/datastax-enterprise-for-startups
On Tue, Jan 26, 2016 at 9:42 AM, Otis Gospodnetić <
otis.gospodne...@gmail.com> wrote:
> Hi Duyhai,
>
> SPM is not free, but there is a free plan, plus we have special pricing
> for startups, non-pro
On 01/22/2016 10:29 PM, Kevin Burton wrote:
I sort of agree.. but we are also considering migrating to hourly
tables.. and what if the single script doesn't run.
I like having N nodes make changes like this because in my experience
that central / single box will usually fail at the wrong time
Hi all,
I can confirm that Sematext SPM is a working option for
monitoring Cassandra. I used it for 1+ year.
Their support is online most of the time, they are very friendly (starting
with Otis) and comprehensive (go discuss with them if the only issue is
pricing, you'll find a way) but overall c
Hi Duyhai,
SPM is not free, but there is a free plan, plus we have special pricing for
startups, non-profits, and education institutions.
Otis
--
Monitoring - Log Management - Alerting - Anomaly Detection
Solr & Elasticsearch Consulting Support Training - http://sematext.com/
On Tue, Jan 26, 20
Hello Otis
The Sematext tools, is it free or not ? And if not free, is there a
"limited" open-source version ?
On Tue, Jan 26, 2016 at 3:39 PM, Otis Gospodnetić <
otis.gospodne...@gmail.com> wrote:
> Hi,
>
> As Julien pointed out, there is a good OpsCenter alternative at
> https://sematext.com/
Hi,
As Julien pointed out, there is a good OpsCenter alternative at
https://sematext.com/spm/integrations/cassandra-monitoring.html
Questions/comments/feedback/milk/cookies are all welcome.
Otis
--
Monitoring - Log Management - Alerting - Anomaly Detection
Solr & Elasticsearch Consulting Support
Hi Dillon,
I advise you to keep writing in the same thread as long as it is about the
same issue, to avoid spreading information. I answered your first email :-).
C*heers,
-
Alain Rodriguez
France
The Last Pickle
http://www.thelastpickle.com
2016-01-26 6:50 GMT+01:00 土卜皿 :
> F
Hi Dillon,
I will assume you're using Murmur3 and that you *don't* use vnodes (ie
"num_token" option commented in cassandra.yaml) as if vnodes are enabled
this operation is useless (and maybe harmful, not sure about that)
Can you give us the output of :
$ *nodetool ring*
It looks like your tryi
If you install the latest OpsCenter you will get a banner stating the policy
changes and linking to:
http://docs.datastax.com/en/opscenter/5.2/opsc/opscPolicyChanges.html
On our side, we decided to go with Sematext SPM to replace OpsCenter for our
2.1 cluster and thus be able to upgrade to 2
Is it really like that? Where does this info come from? I haven’t seen anything
“official" yet.
Hannu
> On 26 Jan 2016, at 15:07,
> wrote:
>
> This is a very strange move considering how well DataStax has supported open
> source Cassandra. I hope there is a reasonable and well-publicized
>
This is a very strange move considering how well DataStax has supported open
source Cassandra. I hope there is a reasonable and well-publicized explanation
for this apparent change in direction.
Sean Durity
From: George Sigletos [mailto:sigle...@textkernel.nl]
Sent: Tuesday, January 26, 2016 4
Can you wipe all the data directories, saved_cache, and commitlog and let the
node bootstrap again?
Sean Durity
From: Nimi Wariboko Jr [mailto:n...@channelmeter.com]
Sent: Monday, January 25, 2016 6:59 PM
To: cassandra-u...@apache.org
Subject: NullPointerException when trying to compact under 3
Hi,
I have the following use case:
A product (P) has 3 or more Devices associated with it. Each device (Di)
emits a set of names (size of the set is less than or equal to 250) every
minute.
Now the ask is: Compute the function f(product,hour) which is defined as
follows:
*foo*(*product*,*hour*) = N
Unfortunately Datastax decided to discontinue Opscenter for open source
Cassandra, starting from version 2.2.
Pitty
On Wed, Jan 6, 2016 at 6:00 PM, Michael Shuler
wrote:
> On 01/06/2016 10:55 AM, Michael Shuler wrote:
> > On 01/06/2016 01:47 AM, Wills Feng wrote:
> >> Looks like opscenter doesn
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