Thanks Jack for quick reply. i didn't understood your question completely.
i am very new to Cassandra. I just installed single node cluster
[root@CSL-simulation bin]# ./nodetool -host 10.59.18.206 -p 7199 status
Note: Ownership information does not include topology; for complete
information, spe
Hello,
Based on what I've read in the archives here and on the documentation on
Datastax and the Cassandra Community, EBS volumes, even provisioned IOPS
with EBS optimized instances, are not recommended due to inconsistent
performance. This I can deal with, but I was hoping for some
recommendation
Keep seeing refs to C*.
I assume that C* == Cassandra? IMHO not a good ref to use what with C,
C++, C#. A language called C* can't be far behind assuming it doesn't
already exist.
;-)
Jim C.
signature.asc
Description: OpenPGP digital signature
On Wed, Jul 23, 2014 at 1:18 PM, DuyHai Doan wrote:
> Why that ? In worst case, CL.ANY will write hints for replicas that are
> down. If will be extraordinary unlucky to have all replicas down at the
> same time
>
Hints are not writes for the purposes of consistency or durability, so your
write
I was being a little tongue in cheek!
On Jul 23, 2014, at 3:20 PM, Jack Krupansky wrote:
> Granted, for “normal” apps it is unlikely to be appropriate but...
>
> From an old post by Jonathan:
> ---
> Extreme write availability
>
> For applications that want Cassandra to accept writes even wh
See https://issues.apache.org/jira/browse/CASSANDRA-7405.
Currently cqlsh's COPY FROM just uses a single-threaded for-loop with
synchronous inserts.
On Wed, Jul 23, 2014 at 8:09 AM, Jack Krupansky
wrote:
> Is it compute bound or I/O bound?
>
> What does your cluster look like?
>
> -- Jack Kr
Granted, for “normal” apps it is unlikely to be appropriate but...
>From an old post by Jonathan:
---
Extreme write availability
For applications that want Cassandra to accept writes even when all the normal
replicas are down (so even ConsistencyLevel.ONE cannot be satisfied), Cassandra
provide
Why that ? In worst case, CL.ANY will write hints for replicas that are
down. If will be extraordinary unlucky to have all replicas down at the
same time
On Wed, Jul 23, 2014 at 9:26 PM, Robert Coli wrote:
> On Wed, Jul 23, 2014 at 12:01 PM, graham sanderson
> wrote:
>
>> Hey now; it is GREAT
Out of curiosity, did you look at or utilize DataStax’s free online training?
See:
http://www.datastax.com/what-we-offer/products-services/training/virtual-training
Any feedback? Any suggestions as to what needs it does or doesn’t fulfill?
-- Jack Krupansky
From: Nicholas Okunew
Sent: Wednesda
On Wed, Jul 23, 2014 at 12:01 PM, graham sanderson wrote:
> Hey now; it is GREAT for a 100% write only use case ;-)
>
A well WORN [1] path in databases, for sure.
=Rob
[1] Write Once Read Never
On Wed, Jul 23, 2014 at 11:44 AM, Kevin Burton wrote:
> I have a lot of experience in distribute systems, understand the space
> well, but I just can't find documentation on how cassandra does things from
> a high level perspective.
>
My belief as to the reason why you are unable to find design
Hey now; it is GREAT for a 100% write only use case ;-)
On Jul 23, 2014, at 12:15 PM, Robert Coli wrote:
> On Tue, Jul 22, 2014 at 7:46 PM, Andrew wrote:
> ONE means write to one replica (in addition to the original). If you want to
> write to any of them, use ANY. Is that the right understa
Interesting.. it was unclear what it does… ONE sounds right to me so I was
curious what was up with ANY. We just set it to ANY so that we could track
down what was causing this bug.
On Wed, Jul 23, 2014 at 10:15 AM, Robert Coli wrote:
> On Tue, Jul 22, 2014 at 7:46 PM, Andrew wrote:
>
>> ONE
This is a great post… and really does a great job of summarizing the
problems I have with the cassandra documentation.
I realize that Datastax is trying to step in and fix the problem.. but
there are now a lot of parties involved (JIRA tickets, blog posts, datastax
doc, apache doc, etc) … it's all
On Wed, Jul 23, 2014 at 4:55 AM, Jason Wee wrote:
> I agree to the people here already sharing their ways to access
> documentation. If you are starter, you should better spend time to search
> for documentation (like using google) or hours to read. Then start ask
> specific question. Coming here
On Tue, Jul 22, 2014 at 7:03 PM, Kevin Burton wrote:
> So , shouldn't it be easy to rebalance a cluster?
>
> I'm not super excited to type out 200 commands to move around individual
> tokens.
>
That's why vnodes exist? Before vnodes, the only sane option was to double
your cluster size...
=Rob
On Tue, Jul 22, 2014 at 7:46 PM, Andrew wrote:
> ONE means write to one replica (in addition to the original). If you want
> to write to any of them, use ANY. Is that the right understanding?
>
This has come up a few times, so let me be unambiguous about when to use
CL.ANY :
NEVER EVER USE CL
try running at CL QUORUM and see if the problem goes away, if it does then it
might be a consistency issue.
also, what version of C*, how many nodes, what is your RF and what CL do you
normally read?
On July 23, 2014 at 12:55:32 PM, Batranut Bogdan (batra...@yahoo.com) wrote:
I have cron job
I have cron jobs that repair every week. node 1 - monday , node 2 tuesday .
On Wednesday, July 23, 2014 7:52 PM, Russell Bradberry
wrote:
sounds like you may need to run a repair
On July 23, 2014 at 12:50:23 PM, Batranut Bogdan (batra...@yahoo.com) wrote:
Hello all,
I have a CF
C
sounds like you may need to run a repair
On July 23, 2014 at 12:50:23 PM, Batranut Bogdan (batra...@yahoo.com) wrote:
Hello all,
I have a CF
CREATE TABLE cf (
a text,
b int,
c int,
d int,
e int,
PRIMARY KEY (a)
) WITH
bloom_filter_fp_chance=0.01 AND
caching='KEYS_ONLY'
Hello all,
I have a CF
CREATE TABLE cf (
a text,
b int,
c int,
d int,
e int,
PRIMARY KEY (a)
) WITH
bloom_filter_fp_chance=0.01 AND
caching='KEYS_ONLY' AND
comment='' AND
dclocal_read_repair_chance=0.00 AND
gc_grace_seconds=864000 AND
index_interval=128 AND
re
My experience is similar to Nicholas'. Basic usage was easy to get a handle
on, but the advanced tuning/tweaking info is scattered EVERYWHERE around
the web, mostly on personal blogs. It feels like it took way too long to
become confident enough in my understanding of Cassandra that I trust our
dep
I'll note that historically the wiki used to be open to all and due massive
amounts of spam it was put on lockdown by the ASF.
If there is a better platform the community feels would make it simpler to
provide community based documentation then we should consider it.
The ASF also has confluence wi
Besides the obviously confusing error message, this particular case could
simply be that the hash value of the primary key belonged to the other node
that wasn’t up, so even though one node was up, it didn’t own that particular
hash value or token, so CL=ONE could not succeed.
What was RF set t
We had a massive spam problem before we locked down the wiki, so
unfortunately that was the choice we had to make. But as stated we can
add you to the contributers list.
What is your Wiki user name?
On 2014-07-23 07:33, Peter Lin wrote:
> I've tried to contribute docs to Cassandra wiki in
Yes, the application includes the C* server and client.
From: Robert Stupp [mailto:sn...@snazy.de]
Sent: Wednesday, July 23, 2014 12:19 AM
To: user@cassandra.apache.org
Subject: Re: EXTERNAL: Re: Running Cassandra Server in an OSGi container
You mean "unzip and run" of an application using C* ?
@benedict - you're right that I've haven't requested permission to edit.
You're also right that I've given up on getting edit permission to
cassandra wiki. I've been struggling and struggled with "how" to manage
open source projects, so I totally get it. Managing projects is a thankless
job most of
On Wed, Jul 23, 2014 at 1:30 PM, Peter Lin wrote:
>
> I sent a request to add a link my .Net driver for cassandra to the wiki
> over 5 weeks back and no response at all.
>
TL;DR There is something wrong with Cassandra information sharing, but I am
partly to blame.
My experience has not been too
Is it compute bound or I/O bound?
What does your cluster look like?
-- Jack Krupansky
From: Akshay Ballarpure
Sent: Wednesday, July 23, 2014 5:00 AM
To: user@cassandra.apache.org
Subject: CSV Import is taking huge time
Hello,
I am trying copy command in Cassandra to import CSV file in to DB,
Requesting a change is very different to requesting permission to edit
(which, I note, still hasn't been made); we do our best to promote
community engagement, so granting a privilege request has a different
mental category to a random edit request, which is much more likely to be
forgotten by any
it supports CQL, but it's through thrift. I don't currently support native
protocol, since that was evolving rapidly last year when I made the port.
I state clearly on nectar-client wiki on google code that it supports CQL3
via thrift. I've pretty much given up on cassandra wiki. Using my blog to
I do recall seeing your announcement of your driver, but I think it got lost in
the discussion of whether it supported CQL. If you say it supports CQL and
native protocol, I’m sure it will get very prompt attention.
-- Jack Krupansky
From: Peter Lin
Sent: Wednesday, July 23, 2014 8:30 AM
To: u
I sent a request to add a link my .Net driver for cassandra to the wiki
over 5 weeks back and no response at all.
I sent another request way back in 2013 and got zero response. Again, I
totally understand people are busy and I'm just as guilty as everyone else
of letting requests slip by. It's the
I think the problem is a little deeper than that. I've been working with
cassandra for about 7 months now - it was very challenging to find out any
real information about using cassandra, and even harder to get clear
information on operating it. There's a truckload of reading you have to do,
and no
All requests I've seen in the past year to edit the wiki (admittedly only
2-3) have been answered promptly with editing privileges. Personally I
don't have a major preference either way for policy - there are positives
and negatives to each approach - but, like I said, raise it on the dev list
and
I agree to the people here already sharing their ways to access
documentation. If you are starter, you should better spend time to search
for documentation (like using google) or hours to read. Then start ask
specific question. Coming here kpkb about poor quality of documentation
just does not cut
I've submitted requests to edit the wiki in the past and nothing ever got
done.
Having been an apache committer and contributor over the years, I can
totally understand that people are busy. I also understand that "most"
developer find writing docs tedious.
I'd rather not harass the committers ab
And the simplest and easiest thing to do is simply email this list when you see
something wrong or missing in the DataStax Cassandra doc, or for anything that
is not adequately anywhere. I work with the doc people there, so I can make
sure they see corrections and improvements. And simply sharin
It only takes a moment to ask to be added as a wiki contributor; if you
email the dev list or ask on irc, somebody with privileges will ordinarily
add you within a day. It may be a psychological barrier, but it isn't
really a practical one. Still, if you feel the policy is incorrect, raise
this on
I've tried to contribute docs to Cassandra wiki in the past, but there's an
obstacle.
currently wiki.apache.org/cassandra is locked down, so only commiters can
edit it. I really wish that wasn't the case, since it wastes time. the
commiters are busy writing code. Having to email a commiter and ask
>
> if you find that adding nodes causes performance to degrade I would
> suspect that you are querying data in one CQL statement that is spread over
> multiple partitions
This is exactly what is happening. The better way to query multiple
partitions is to simply despatch multiple queries (asynch
On Wed, Jul 23, 2014 at 12:07 PM, Ben Hood <0x6e6...@gmail.com> wrote:
> Or have I just been looking at the wrong version of the spec all along?
So it turns out that this is a case of PEBCAK: v2 of the protocol is
formulated thusly:
4.2.5.4. Prepared
The result to a PREPARE message. The rest o
On Wed, Jul 23, 2014 at 11:14 AM, Ben Hood <0x6e6...@gmail.com> wrote:
> But I was wondering if we were doing something wrong by not returning
> the result meta data from the PREPARE result (if it does indeed
> exist).
Looking into this a bit further, it looks like the client driver needs
to deser
Hi all,
I'm looking at the specification of statement preparation (section
4.2.5.4 of the CQL protocol) and I'm wondering whether the metadata
result of the PREPARE query only returns column information for the
query arguments, and not for the columns of the actual query result.
The background is
I posted the query wrong, I gave the query for 1 key versus the large batch
of ids like I was testing.
What it was using for large batch was IN, so
Select * from foo where key IN and col_name='LATEST
So after breaking it down and reading as much as I can with regard to our
- schema, dynami
On Wed, Jul 23, 2014 at 1:53 AM, Robert Coli wrote:
> On Tue, Jul 22, 2014 at 1:53 AM, Ben Hood <0x6e6...@gmail.com> wrote:
> Indeed, reading up on the issue (and discussing it with folks) there are a
> number of mitigating factors, most significantly driver workarounds use of
> TimeUUIDs, which m
On Wed, Jul 23, 2014 at 1:53 AM, Robert Coli wrote:
> On Tue, Jul 22, 2014 at 1:53 AM, Ben Hood <0x6e6...@gmail.com> wrote:
> In this particular case, the answer to "why not" involves the idea that one
> needs to be able to test with a driver in order to expose it, and currently
> (as I understand
Hello,
I am trying copy command in Cassandra to import CSV file in to DB, Import
is taking huge time, any suggestion to improve it?
id,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z
100,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26
101,1,2,3,4,5,6,7,8,9,10,11,12,13,14
"How they have migrated from RDBMS to Cassandra?"
-> there is no one-answer-fits-all. It all depends on the application
features
"What are the things to consider?"
-> design data model with query-first approach. The choice of how/when/what
to denormalize is crucial
"How they have converted data
I would like to help out with the documentation of C*. How do I start?
On Wed, Jul 23, 2014 at 12:46 PM, Robert Stupp wrote:
> Just a note:
> If you have suggestions how to improve documentation on the datastax
> website, write them an email to d...@datastax.com. They appreciate
> proposals :)
It won't. Cassandra stores a node's host ID in an end-point to host ID
mapping, each ID must be unique and cannot be changed after the fact.
Mark
On Mon, Jul 21, 2014 at 4:44 PM, John Sanda wrote:
> Under what circumstances, if any, will a node's host ID change?
>
> - John
>
Hi Kevin,
This message was likely generated by the Java driver, not by Cassandra.
I'll follow up to your other post on the driver's mailing list.
-- Olivier
On Wed, Jul 23, 2014 at 4:37 AM, Kevin Burton wrote:
> Perhaps it's me but it seems this exception is wrong:
>
> "Cassandra timeout dur
You mean "unzip and run" of an application using C* ?
Am 23.07.2014 um 00:34 schrieb Rodgers, Hugh :
> What got our team on the path of trying to embed C* was the wiki page
> http://wiki.apache.org/cassandra/Embedding which implies this can be done.
> Also WSO2 Carbon and Achilles have both emb
Just a note:
If you have suggestions how to improve documentation on the datastax website,
write them an email to d...@datastax.com. They appreciate proposals :)
Am 23.07.2014 um 09:10 schrieb Mark Reddy :
> Hi Kevin,
>
> The difference here is that the Apache Cassandra site is maintained by th
Hi Kevin,
The difference here is that the Apache Cassandra site is maintained by the
community whereas the DataStax site is maintained by paid employees with a
vested interest in producing documentation.
With DataStax having some comprehensive docs, I guess the desire for people
to maintain the A
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