Re: disable compaction if all data are read-only?

[Robert Wille]

You still need compaction. Compaction is what organizes your data into levels. 
Without compaction, every query would have to look at every SSTable.

Also, due to commit log rotation, your memtable may get flushed from time to 
time before it is full, resulting in small SSTables that would benefit from 
compaction.

On Apr 8, 2016, at 5:49 AM, Yatong Zhang 
> wrote:

I am using leveled strategy. What if my data are 'append-only'? I mean there 
are always new data but will be never changed once written to cassandra?

On Fri, Apr 8, 2016 at 6:33 PM, Pedro Gordo 
> wrote:
Hi Yatong

My understanding is that if you have a table whichi read-only and hence doesn't 
receive any writes, then no SSTables will be created, and hence, no compaction 
will happen. What compaction strategy do you have on your table?

Best regards

Pedro Gordo

On 8 April 2016 at 10:42, Yatong Zhang 
> wrote:
Hi there,
I am wondering if it is possible to disable compaction when all my data are 
read-only?

Re: disable compaction if all data are read-only?

[Yatong Zhang]

I am using leveled strategy. What if my data are 'append-only'? I mean
there are always new data but will be never changed once written to
cassandra?

On Fri, Apr 8, 2016 at 6:33 PM, Pedro Gordo 
wrote:

> Hi Yatong
>
> My understanding is that if you have a table whichi read-only and hence
> doesn't receive any writes, then no SSTables will be created, and hence, no
> compaction will happen. What compaction strategy do you have on your table?
>
> Best regards
>
> Pedro Gordo
>
> On 8 April 2016 at 10:42, Yatong Zhang  wrote:
>
>> Hi there,
>> I am wondering if it is possible to disable compaction when all my data
>> are read-only?
>>
>
>

Re: disable compaction if all data are read-only?

[Pedro Gordo]

Hi Yatong

My understanding is that if you have a table whichi read-only and hence
doesn't receive any writes, then no SSTables will be created, and hence, no
compaction will happen. What compaction strategy do you have on your table?

Best regards

Pedro Gordo

On 8 April 2016 at 10:42, Yatong Zhang  wrote:

> Hi there,
> I am wondering if it is possible to disable compaction when all my data
> are read-only?
>