Dear All,
We are expericencing a strange issue.Currently we have a Cluster with Cassandra
2.1.13.
when the applications start,it will print the following warings.And it takes
long time for applications to start.
Could you please advise ?
2017-07-26 15:49:20.676 WARN 11706 --- [-] [cluster1-n
https://datastax-oss.atlassian.net/browse/JAVA-1002
This one says it's the driver issue,we will have a try.
-- Original --
From: "";<2535...@qq.com>;
Date: Wed, Jul 26, 2017 04:12 PM
To: "user";
Subject: Timeout while setting keyspace
Dear A
One more question.why the # of racks should be equal to RF?
For example,we have 4 machines,each virtualized to 8 vms ,can we set 4 RACs
with RF3?I mean one machine one RAC.
Thanks
-- 原始邮件 --
发件人: "我自己的邮箱";<2535...@qq.com>;
发送时间: 2017年7月26日(星期三) 上午10:32
收件人: "
I have a C* cluster (3 nodes) with some 60gb data (replication factor 2).
when I started using C* coming from SQL background didn't give much thought
about modeling the data correctly. so what I did was
CREATE TABLE data ( deviceId int,
time timestamp,
field
Hi Junaid,
Given a time range do you want to take all devices or a specific device?
On Jul 26, 2017 3:15 PM, "Junaid Nasir" wrote:
I have a C* cluster (3 nodes) with some 60gb data (replication factor 2).
when I started using C* coming from SQL background didn't give much thought
about modeling
as per Brooke suggests,RACs a multipile of RF.
https://www.youtube.com/watch?v=QrP7G1eeQTI
if we have 6 machines with RF=3,then we can set up 6 RACs or setup 3RACs,which
will be better?
Could you please further advise?
Many thanks
-- 原始邮件 --
发件人: "我自己的邮箱";<2
all devices.
After selecting the data I group them and perform other actions i.e sum,
avg on fields and then display those to compare how devices are doing
compared to each other.
On Wed, Jul 26, 2017 at 5:32 PM, CPC wrote:
> Hi Junaid,
>
> Given a time range do you want to take all devices or a
Hey everyone,
I'm new to Cassandra, going my first steps, having a problem/question regarding
sorting results and proper data modelling.
First of all, I read the article "We Shall Have Order!" by Aaron Ploetz (1) to
get a first view on how Cassandra works.
I reproduced the example in the articl
Thank you very much Kurt.
I am not a java guy, need one small help. I initiated JMX connection but I
am getting some exception:
java -jar ~/jmxterm-1.0-alpha-4-uber.jar --url localhost:7199
Welcome to JMX terminal. Type "help" for available commands.
$>run -b org.apache.cassandra.metrics:type=C
You need to also have the mx4j jar in your Cassandra lib directory. Double
checking you did that – its not included with the distro.You have to
download it.
http://mx4j.sourceforge.net/
R
From: Nitan Kainth
Reply-To: "user@cassandra.apache.org"
Date: Wednesday, July 26, 2017 at 8:22 AM
Hi Brooke,
Very nice presentation:https://www.youtube.com/watch?v=QrP7G1eeQTI !! Good to
know that you are able to leverage Racks for gainingoperational efficiencies. I
think vnodes have made life easier.
I still see some concerns with Racks:
1. Usually scaling needs are driven by business req
If all of your queries like this(i mean get all devices given a a time
range) Hadoop would be more appropriate since those are analytical queries.
Anyway, to query such data with spark Cassandra connector your partition
key could include day and hash of your deviceid as pseudo partition key
colu
Hey Roger,
I downloaded and saved the file in /var/lib/cassandra, but getting same error:
java -jar /tmp/jmxterm-1.0-alpha-4-uber.jar --url localhost:7199
Welcome to JMX terminal. Type "help" for available commands.
$>run -b org.apache.cassandra.metrics:type=ClientRequest scope=CASWrite
name=M
I think that is not the correct lib directory.You want it under
$CASSANDRA_HOME/lib. Ie wherever you deployed cassandra distro into / lib
That directory should be loaded with *.jar files. That is the directory you
want.
Roger
From: Nitan Kainth
Reply-To: "user@cassandra.apache.org"
D
Nitan,
I'm not really familiar with jmxterm but the error it's returning to you is
because that MBean doesn't exist. The full MBean matching your example is
org.apache.cassandra.metrics:type=ClientRequest,scope=CASWrite,name=MutationSizeHistogram.
You can then call the operation values on it to ge
Kurt/All,
why the # of racks should be equal to RF?
For example,we have 2 DCs each 6 machines with RF=3,each machine virtualized to
8 vms ,
can we set 6 racs with RF3? I mean one machine one RAC to avoid hardware errors
or only set 3 racs,1 rac with 2 machines,which is better?
Thanks
On 2017-07-26 05:15 (-0700), Junaid Nasir wrote:
> I have a C* cluster (3 nodes) with some 60gb data (replication factor 2).
> when I started using C* coming from SQL background didn't give much thought
> about modeling the data correctly. so what I did was
>
> CREATE TABLE data ( deviceId int
On 2017-07-25 15:49 (-0700), Roger Warner wrote:
> This is a quick informational question. I know that Cassandra can detect
> failures of nodes and repair them given replication and multiple DC.
>
> My question is can Cassandra tell if data was lost after a failure and
> node(s) âfixed
On 2017-07-25 12:49 (-0700), David Salz wrote:
> Hi,
>
> has anyone seen the following exception before?
>
> Context:
>
> * Cassandra 3.9,
>
> * single node (20 Cores / 256 GB RAM)
>
A single node with 20 cores and 256GB of RAM is probably not going to be the
best choice - while it's a g
On 2017-07-26 19:38 (-0700), "Peng Xiao" <2535...@qq.com> wrote:
> Kurt/All,
>
>
> why the # of racks should be equal to RF?
>
> For example,we have 2 DCs each 6 machines with RF=3,each machine virtualized
> to 8 vms ,
> can we set 6 racs with RF3? I mean one machine one RAC to avoid hardwa
Note that if you use more racks than RF you lose some of the operational
benefit. e.g: you'll still only be able to take out one rack at a time
(especially if using vnodes), despite the fact that you have more racks
than RF. As Jeff said this may be desirable, but really it comes down to
what your
Thanks and regards,
Subhankar
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