Re: Problems with cassandra on AWS

[daemeon reiydelle]

xWell, I seem to recall that the private IP's are valid for communications
WITHIN one VPC. I assume you can log into one machine and ping (or ssh) the
others. If so, check that cassandra.yaml is not set to listen on 127.0.0.1
(localhost).


*...*



*Daemeon C.M. ReiydelleUSA (+1) 415.501.0198
<%28%2B1%29%20415.501.0198>London (+44) (0) 20 8144 9872
<%28%2B44%29%20%280%29%2020%208144%209872>*

On Sun, Jul 10, 2016 at 4:54 PM, Kant Kodali  wrote:

> Hi Guys,
>
> I installed a 3 node Cassandra cluster on AWS and my replication factor is
> 3. I am trying to insert some data into a table. I set the consistency
> level of QUORUM at a Cassandra Session level. It only inserts into one node
> and unable to talk to other nodes because it is trying to contact other
> nodes through private IP and obviously that is failing so I am not sure how
> to change settings in say cassandra.yaml or somewhere such that rpc_address
> in system.peers table is updated to public IP's? I tried changing the seeds
> to all public IP's that didn't work as it looks like ec2 instances cannot
> talk to each other using public IP's. any help would be appreciated!
>
> Thanks,
> kant
>

archive cassandra data

[Stone Fang]

Hi all,

Have some thought on this issue .
https://issues.apache.org/jira/browse/CASSANDRA-8460

but still have not received reply after comment for several days,it is a
old ticket,created on 11/Dec/14.anybody know how to go on this ticket.

thanks in advance!

stone

Re: Blog post on Cassandra's inner workings and performance - feedback welcome

[Graham Sanderson]

2 )”why more memory makes things worse” - I’d be interested to see you argue 
that - it really isn’t true with big boxes. (but yes off heap is good) - we run 
24 gig JVMs with 8g new gen and never see more than a second or so STW and that 
is rare (but we do have lot of -XX: options)

> On Jul 9, 2016, at 11:58 AM, daemeon reiydelle  wrote:
> 
> I saw this really useful post a few days ago. I found the organization and 
> presentation quite clear and helpful (I often struggle trying to do high 
> level comparisons of Hadoop and Cass). Thank you!
> 
> If there was sections I would like to see your clear thoughts appear within, 
> it would be around:
> (1) why networks need to be clean (the impact of "dirty"/erratic networks); 
> (2) the impact of java (off heap, stop the world garbage collection, why more 
> memory makes things worse;
> (3) table design decisions (read mostly, write mostly, mixed read/write, etc.)
> A really great writeup, thank you!
> 
> 
> 
> 
> 
> 
> ...
> 
> Daemeon C.M. Reiydelle
> USA (+1) 415.501.0198
> London (+44) (0) 20 8144 9872
> 
> On Fri, Jul 8, 2016 at 11:59 PM, Manuel Kiessling  > wrote:
> Yes, the joke's on me. It was a copy&paste error, and I've since posted the 
> correct URL (journeymonitor.com 
> :4000/tutorials/2016/02/29/cassandra-inner-workings-and-how-this-relates-to-performance/).
>  
> 
> Substantial feedback regarding the actual post still very much welcome.
> 
> Regards,
> Manuel
> 
> Am 09.07.2016 um 03:32 schrieb daemeon reiydelle  >:
> 
>> Localhost is a special network address that never leaves the operating 
>> system. It only goes "half way" down the IP stack. Thanks for your efforts!
>> 
>> 
>> ...
>> 
>> Daemeon C.M. Reiydelle
>> USA (+1) 415.501.0198 
>> London (+44) (0) 20 8144 9872 
>> 
>> On Fri, Jul 8, 2016 at 5:53 PM, Joaquin Alzola > > wrote:
>> Hi Manuel
>> 
>>  
>> 
>> I think localhost will not work for people on the internet.
>> 
>>  
>> 
>> BR
>> 
>>  
>> 
>> Joaquin
>> 
>>  
>> 
>> From: kiessling.man...@gmail.com  
>> [mailto:kiessling.man...@gmail.com ] On 
>> Behalf Of Manuel Kiessling
>> Sent: 07 July 2016 14:12
>> To: user@cassandra.apache.org 
>> Subject: Blog post on Cassandra's inner workings and performance - feedback 
>> welcome
>> 
>>  
>> 
>> Hi all,
>> 
>> I'm currently in the process of understanding the inner workings of 
>> Cassandra with regards to network and local storage mechanisms and 
>> operations. In order to do so, I've written a blog post about it which is 
>> now in a "first final" version.
>> 
>> Any feedback, especially corrections regarding misunderstandings on my side, 
>> would be highly appreciated. The post really represents my very subjective 
>> view on how Cassandra works under the hood, which makes it prone to errors 
>> of course.
>> 
>> You can access the current version at 
>> http://localhost:4000/tutorials/2016/02/29/cassandra-inner-workings-and-how-this-relates-to-performance/
>>  
>> 
>>  
>> 
>> Thanks,
>> 
>> --
>> 
>>  Manuel
>> 
>> This email is confidential and may be subject to privilege. If you are not 
>> the intended recipient, please do not copy or disclose its content but 
>> contact the sender immediately upon receipt.
>> 
> 



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