Added one nit to the PR. Otherwise, this is awesome :)
On Wed, Nov 15, 2023 at 11:01 AM Jordan West wrote:
> I would also like to back this proposal. We change this default because
> several incidents have occurred by leaving the default of auto. There are
> rare cases where auto/mmap is the bet
I would also like to back this proposal. We change this default because
several incidents have occurred by leaving the default of auto. There are
rare cases where auto/mmap is the better option but as for a default
mmap_index_only is safer.
On Wed, Nov 15, 2023 at 6:35 AM Paulo Motta wrote:
> Hi
Hi,
I would like to get back to this. I proposed this default configuration
change on the user list ~1 month ago and there were no comments [1].
I created CASSANDRA-19021 [2] to make the proposed change and Stefan kindly
submitted a patch, CI is looking good.
Any objections to making this change
> I wonder why disk_access_mode property is not in cassandra.yaml (looking
into trunk right now)
I think there's a prehistoric reason why it was removed but I can't
remember right now.
> Do you all think we can add it there with brief explanation what each
option does?
We could reinclude it as l
Thanks for starting this discussion, Paulo!
Shall we also share this thread with @user?
On Wed, 6 Sep 2023 at 16:35, C. Scott Andreas wrote:
> Supportive of switching the default to mmap_index_only as well.
>
> I don’t have numbers handy to share, but my experience has been
> significantly lowe
@cassandra.apache.org
Subject: Re: [DISCUSS] Update default disk_access_mode to mmap_index_only on 5.0
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+100 to this
We'd have to come up
+100 to this
We'd have to come up w/ a pretty compelling counterexample to NOT switch
the default to mmap_index_only at this point.
On Wed, Sep 6, 2023 at 11:40 AM Brandon Williams wrote:
> Given https://issues.apache.org/jira/browse/CASSANDRA-17237 I think it
> makes sense. At the least I thi
Given https://issues.apache.org/jira/browse/CASSANDRA-17237 I think it
makes sense. At the least I think we should restore disk_access_mode
so that users are more aware of the options available.
Kind Regards,
Brandon
On Wed, Sep 6, 2023 at 10:50 AM Paulo Motta wrote:
>
> Hi,
>
> I've been bitte
Supportive of switching the default to mmap_index_only as well.
I don’t have numbers handy to share, but my experience has been significantly
lower read latency and I wouldn’t run with auto. I’ve also not observed
substantial heap pressure after switching - it was strictly an improvement.
- Sco
Hi,
I've been bitten by OOMs with disk_access_mode:auto/mmap that were fixed by
changing to disk_access_mode:mmap_index_only. In a particular benchmark I
got 5x more read throughput on 3.11.x with disk_access_mode:
mmap_index_only vs disk_access_mode: auto/mmap.
Changing disk_access_mode to mmap_
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