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From Dmitry Pavlov <dpavlov....@gmail.com>
Subject Re: Ignite Direct I/O plugin description added to wiki
Date Fri, 23 Mar 2018 21:34:15 GMT
Hi Prachi,

Yes, it's a great description.

I'm impressed by how informative and short you managed to make it.

Thank you!

Sincerely,
Dmitriy Pavlov

сб, 24 мар. 2018 г. в 0:29, Prachi Garg <pgarg@gridgain.com>:

> Dmitriy,
>
> I have documented the Direct I/O plugin. Please review [1] and provide
> comments/feedback in the ticket [2].
>
> [1]
>
> https://apacheignite.readme.io/v2.4/docs/durable-memory-tuning#section-enabling-direct-i-o
>
> [2] https://issues.apache.org/jira/browse/IGNITE-7466
>
>
> -Prachi
>
> On Wed, Mar 21, 2018 at 11:22 PM, Dmitry Pavlov <dpavlov.spb@gmail.com>
> wrote:
>
> > Yes, will do.
> >
> > чт, 22 мар. 2018 г. в 1:05, Denis Magda <dmagda@apache.org>:
> >
> > > Dmitriy,
> > >
> > > Thanks for updating the WAL section. Now it makes total sense to me.
> > >
> > > As for the page with JNA projects, let's get added there! Could you
> > > contact the owners?
> > >
> > > --
> > > Denis
> > >
> > >
> > > On Wed, Mar 21, 2018 at 9:27 AM, Dmitry Pavlov <dpavlov.spb@gmail.com>
> > > wrote:
> > >
> > >> Denis,
> > >>
> > >> one more thing, can/should we mention Ignite Direct IO plugin in list
> of
> > >> project using JNA here: https://github.com/java-native-access/jna
> > >>
> > >> Sincerely,
> > >> Dmitriy Pavlov
> > >>
> > >> ср, 21 мар. 2018 г. в 1:59, Denis Magda <dmagda@apache.org>:
> > >>
> > >>> *Dmitriy*, thanks. Astonishing job! We'll add a section to the
> durable
> > >>> memory tuning page and refer to the wiki for more details:
> > >>> https://issues.apache.org/jira/browse/IGNITE-7466
> > >>>
> > >>> Please clarify the following:
> > >>>
> > >>> > Direct I/O mode can't be enabled for Write Ahead Log files.
> However,
> > >>> when
> > >>> > working with plugin, WAL manager applies advising Linux systems
do
> > not
> > >>> > store the data of the file in page cache as they are not required.
> > >>>
> > >>>
> > >>> For me, it means that WAL always goes through the operating system
> I/O
> > >>> calls. Nothing changes for the WAL. However, I'm not sure what you
> > meant
> > >>> to
> > >>> explain by saying "when working with the plugin (Direct I/O) WAL
> > manager
> > >>> applies...". Could you rephrase it to bring more clarity?
> > >>>
> > >>> *Raymond,*
> > >>>
> > >>>
> > >>> If Direct I/O is enabled by default it will bring down the
> performance
> > of
> > >>> read-intensive application because, as Dmitry says, the reads bypass
> > page
> > >>> cache. So, I would recommend using it for write-intensive workloads
> > and,
> > >>> probably, for mixed-workloads depending on the reads and writes rate.
> > >>>
> > >>> --
> > >>> Denis
> > >>>
> > >>>
> > >>> On Tue, Mar 20, 2018 at 2:29 PM, Raymond Wilson <
> > >>> raymond_wilson@trimble.com>
> > >>> wrote:
> > >>>
> > >>> > Looks good!
> > >>> >
> > >>> > Is there any reason why this should not be a default setting if
it
> > >>> > gracefully downgrades to non-Direct IO if not supported by the
OS?
> > >>> >
> > >>> > Thanks,
> > >>> > Raymond.
> > >>> >
> > >>> > -----Original Message-----
> > >>> > From: Dmitriy Setrakyan [mailto:dsetrakyan@apache.org]
> > >>> > Sent: Wednesday, March 21, 2018 10:23 AM
> > >>> > To: dev <dev@ignite.apache.org>
> > >>> > Subject: Re: Ignite Direct I/O plugin description added to wiki
> > >>> >
> > >>> > Thanks Dmitry, awesome work!
> > >>> >
> > >>> > On Wed, Mar 21, 2018 at 12:21 AM, Dmitry Pavlov <
> > dpavlov.spb@gmail.com
> > >>> >
> > >>> > wrote:
> > >>> >
> > >>> > > Hi Igniters,
> > >>> > >
> > >>> > > I've added description of new plugin for Direct I/O for native
> > >>> > > persistence (
> > >>> > > https://issues.apache.org/jira/browse/IGNITE-6341)  to wiki
> > >>> > > https://cwiki.apache.org/confluence/display/IGNITE/
> > >>> > > Ignite+Persistent+Store+-+under+the+hood#IgnitePersistentStore-
> > >>> > > underthehood-DirectI/O
> > >>> > >
> > >>> > >
> > >>> > > SIncerely,
> > >>> > > Dmitriy Pavlov
> > >>> > >
> > >>> >
> > >>>
> > >>
> > >
> >
>

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