Strongly agree with this point of view that direct IO can bring great
benefits.
I have reviewed part of the code, and my preliminary judgment is that it is
not very common and limited in some situations, for example, it works for
commitlog's write path only for this patch.So I suggest that the d
*Glad you brought up compaction here - I think there would be a significant
benefit to moving compaction to direct i/o.*
+1. Would love to see this get traction.
On Mon, 16 Oct 2023 at 19:38, Jon Haddad wrote:
> Glad you brought up compaction here - I think there would be a significant
> benefi
I haven't looked at the patch yet so take whatever I say here with a pinch of
salt.
Philosophically, defaults should not change unless there is a clear
demonstrable benefit in majority cases for our users. In this case DirectIO
should have clear benefits. That said, this is a new feature and I
Glad you brought up compaction here - I think there would be a significant
benefit to moving compaction to direct i/o.
On 2023/10/16 16:14:28 Benedict wrote:
> I have some plans to (eventually) use the commit log as memtable payload
> storage (ie memtables would reference the commit log entries
I have some plans to (eventually) use the commit log as memtable payload
storage (ie memtables would reference the commit log entries directly, storing
only indexing info), and to back first level of sstables by reference to commit
log entries. This will permit us to deliver not only much bigger
I haven't looked at the patch, but at a high level, defaulting to direct I/O
for commit logs makes a lot of sense to me.
On 2023/10/16 06:34:05 "Pawar, Amit" wrote:
> [Public]
>
> Hi,
>
> CommitLog uses mmap (memory mapped ) segments by default. Direct-IO feature
> is proposed through new PR
FYI
CASSANDRA-18665 has been committed.
This makes our ci-cassandra.a.o stage jobs on 5.0 and trunk branches build
and test with the in-tree script instead of cassandra-builds.
This is a significant change, lots of testing happened, but I'm still
expecting some trouble (like everytime we touch ci
s2e11 - Sarma Pydipally
(You may have to download it to play)
https://drive.google.com/file/d/1X98HjR0G3wnRaUUuUUvsDyvx05QZYXXN/view?usp=drive_link
It will remain in staging for 72 hours, going live (assuming no objections)
by Thursday, October 19th.
If anyone should have any questions or commen
I think what we should do is provide options, and let users make their own
decisions.
The default behavior should not be modified until some future released
version.
Pawar, Amit 于2023年10月16日周一 15:51写道：
> [Public]
>
> Hi,
>
>
>
> CommitLog uses mmap (memory mapped ) segments by default. Direct
