答复: 答复: Re: cassandra update vs insert + delete

[Xiangfei Ni]

It is not possible to update the primary key.

Best Regards,

倪项菲/ David Ni
中移德电网络科技有限公司
Virtue Intelligent Network Ltd, co.
Add: 2003,20F No.35 Luojia creative city,Luoyu Road,Wuhan,HuBei
Mob: +86 13797007811|Tel: + 86 27 5024 2516

发件人: onmstester onmstester <onmstes...@zoho.com>
发送时间: 2018年5月28日 14:42
收件人: user <user@cassandra.apache.org>
主题: Fwd: 答复: Re: cassandra update vs insert + delete

It seems that i can't update a part of primary key in cqlsh update:
message "PRIMARY Key part column found in SET part"


Sent using Zoho Mail<https://www.zoho.com/mail/>


 Forwarded message 
From : Xiangfei Ni <xiangfei...@cm-dt.com<mailto:xiangfei...@cm-dt.com>>
To : 
"user@cassandra.apache.org<mailto:user@cassandra.apache.org>"<user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
Date : Mon, 28 May 2018 11:04:06 +0430
Subject : 答复: Re: cassandra update vs insert + delete
 Forwarded message 

Yes, you are correct.

Best Regards,

倪项菲/ David Ni
中移德电网络科技有限公司
Virtue Intelligent Network Ltd, co.
Add: 2003,20F No.35 Luojia creative city,Luoyu Road,Wuhan,HuBei
Mob: +86 13797007811|Tel: + 86 27 5024 2516

发件人: onmstester onmstester <onmstes...@zoho.com<mailto:onmstes...@zoho.com>>
发送时间: 2018年5月28日 14:33
收件人: user <user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
主题: Fwd: Re: cassandra update vs insert + delete

How update is working underneath?
Does it create a new row (because i'm changing a column of partition key) and 
add a tombstone to the old row?


Sent using Zoho Mail<https://www.zoho.com/mail/>


 Forwarded message 
From : Jonathan Haddad <j...@jonhaddad.com<mailto:j...@jonhaddad.com>>
To : <user@cassandra.apache.org<mailto:user@cassandra.apache.org>>
Date : Mon, 28 May 2018 00:07:36 +0430
Subject : Re: cassandra update vs insert + delete
 Forwarded message 

What is a “soft delete”?

My 2 cents, if you want to update some information just update it. There’s no 
need to overthink it.

Batches are good if they’re constrained to a single partition, not so hot 
otherwise.


On Sun, May 27, 2018 at 8:19 AM Rahul Singh 
<rahul.xavier.si...@gmail.com<mailto:rahul.xavier.si...@gmail.com>> wrote:

--
Jon Haddad
http://www.rustyrazorblade.com
twitter: rustyrazorblade
Deletes create tombstones — not really something to consider. Better to add / 
update or insert data and do a soft delete on old data and apply a TTL to 
remove it at a future time.

--
Rahul Singh
rahul.si...@anant.us<mailto:rahul.si...@anant.us>

Anant Corporation

On May 27, 2018, 5:36 AM -0400, onmstester onmstester 
<onmstes...@zoho.com<mailto:onmstes...@zoho.com>>, wrote:

Hi
I want to load all rows from many partitions and change a column value in each 
row, which of following ways is better concerning disk space and performance?
1. create a update statement for every row and batch update for each partitions
2. create an insert statement for every row and batch insert for each 
partition, then run a single statement to delete the whole old partition

Thanks in advance


Sent using Zoho Mail<https://www.zoho.com/mail/>

Fwd: 答复: Re: cassandra update vs insert + delete

[onmstester onmstester]

It seems that i can't update a part of primary key in cqlsh update:

message "PRIMARY Key part column found in SET part"


Sent using Zoho Mail






 Forwarded message 

>From : Xiangfei Ni xiangfei...@cm-dt.com

To : "user@cassandra.apache.org"user@cassandra.apache.org

Date : Mon, 28 May 2018 11:04:06 +0430

Subject : 答复: Re: cassandra update vs insert + delete

 Forwarded message 




Yes, you are correct.

 

Best Regards,

 

倪项菲/ David Ni

中移德电网络科技有限公司

Virtue Intelligent Network Ltd, co.

Add: 2003,20F No.35 Luojia creative city,Luoyu Road,Wuhan,HuBei

Mob: +86 13797007811|Tel: + 86 27 5024 2516


 

发件人: onmstester onmstester onmstes...@zoho.com 
 发送时间: 2018年5月28日 14:33
 收件人: user user@cassandra.apache.org
 主题: Fwd: Re: cassandra update vs insert + delete


 

How update is working underneath?


Does it create a new row (because i'm changing a column of partition key) and 
add a tombstone to the old row?


 


Sent using Zoho Mail


 


 


 Forwarded message 


>From : Jonathan Haddad j...@jonhaddad.com


To : user@cassandra.apache.org


Date : Mon, 28 May 2018 00:07:36 +0430


Subject : Re: cassandra update vs insert + delete


 Forwarded message 



 


What is a “soft delete”? 


 


My 2 cents, if you want to update some information just update it. There’s no 
need to overthink it. 


 


Batches are good if they’re constrained to a single partition, not so hot 
otherwise. 


 


 


On Sun, May 27, 2018 at 8:19 AM Rahul Singh 
rahul.xavier.si...@gmail.com wrote:


 




--


Jon Haddad


http://www.rustyrazorblade.com


twitter: rustyrazorblade




Deletes create tombstones — not really something to consider. Better to add / 
update or insert data and do a soft delete on old data and apply a TTL to 
remove it at a future time.


 


--


Rahul Singh


rahul.si...@anant.us


 


Anant Corporation




 


On May 27, 2018, 5:36 AM -0400, onmstester onmstester 
onmstes...@zoho.com, wrote:


 


Hi


I want to load all rows from many partitions and change a column value in each 
row, which of following ways is better concerning disk space and performance?


1. create a update statement for every row and batch update for each partitions


2. create an insert statement for every row and batch insert for each 
partition, then run a single statement to delete the whole old partition


 


Thanks in advance


 


Sent using Zoho Mail


 






 



 

答复: Re: cassandra update vs insert + delete

[Xiangfei Ni]

Yes, you are correct.

Best Regards,

倪项菲/ David Ni
中移德电网络科技有限公司
Virtue Intelligent Network Ltd, co.
Add: 2003,20F No.35 Luojia creative city,Luoyu Road,Wuhan,HuBei
Mob: +86 13797007811|Tel: + 86 27 5024 2516

发件人: onmstester onmstester 
发送时间: 2018年5月28日 14:33
收件人: user 
主题: Fwd: Re: cassandra update vs insert + delete

How update is working underneath?
Does it create a new row (because i'm changing a column of partition key) and 
add a tombstone to the old row?


Sent using Zoho Mail


 Forwarded message 
From : Jonathan Haddad >
To : >
Date : Mon, 28 May 2018 00:07:36 +0430
Subject : Re: cassandra update vs insert + delete
 Forwarded message 

What is a “soft delete”?

My 2 cents, if you want to update some information just update it. There’s no 
need to overthink it.

Batches are good if they’re constrained to a single partition, not so hot 
otherwise.


On Sun, May 27, 2018 at 8:19 AM Rahul Singh 
> wrote:

--
Jon Haddad
http://www.rustyrazorblade.com
twitter: rustyrazorblade
Deletes create tombstones — not really something to consider. Better to add / 
update or insert data and do a soft delete on old data and apply a TTL to 
remove it at a future time.

--
Rahul Singh
rahul.si...@anant.us

Anant Corporation

On May 27, 2018, 5:36 AM -0400, onmstester onmstester 
>, wrote:

Hi
I want to load all rows from many partitions and change a column value in each 
row, which of following ways is better concerning disk space and performance?
1. create a update statement for every row and batch update for each partitions
2. create an insert statement for every row and batch insert for each 
partition, then run a single statement to delete the whole old partition

Thanks in advance


Sent using Zoho Mail