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From Vladimir Ozerov <voze...@gridgain.com>
Subject Re: Persistence per memory policy configuration
Date Mon, 16 Oct 2017 18:17:27 GMT
+1 to Ivan's suggestion.

пн, 16 окт. 2017 г. в 21:00, Ivan Rakov <ivan.glukos@gmail.com>:

> *swapPath* is ok for me. It is also consistent with *walPath* and
> *walArchivePath*.
>
> Regarding persistencePath/storagePath, I don't like the idea when path
> for WAL is implicitly changed, especially when we have separate option
> for it.
> WAL and storage files are already located under same $IGNITE_HOME root.
>  From user perspective, there's no need to change root for all
> persistence-related directories as long as $IGNITE_HOME points to the
> correct disk.
>  From developer perspective, this change breaks backwards compatibility.
> Maintaining backwards compatibility in fail-safe way (checking both
> old-style and new-style paths) is complex and hard to maintain in the
> codebase.
>
> Best Regards,
> Ivan Rakov
>
> My vote is for *storagePath* and keeping behavior as is.
>
> On 16.10.2017 16:53, Pavel Tupitsyn wrote:
> > Igniters, another thing to consider:
> >
> > DataRegionConfiguration.SwapFilePath should be SwapPath,
> > since this is actually not a single file, but a directory path.
> >
> > On Fri, Oct 13, 2017 at 7:53 PM, Denis Magda <dmagda@apache.org> wrote:
> >
> >> Seems I've got what you’re talking about.
> >>
> >> I’ve tried to change the root directory (*persistencePath*) and saw that
> >> only data/indexes were placed to it while wal stayed somewhere in my
> work
> >> dir. It works counterintuitive and causes non productive discussions
> like
> >> we are in arguing about *persistencePath* or *storagePath*. Neither name
> >> fits this behavior.
> >>
> >> My suggestion will be the following:
> >> - *persistencePath* refers to the path of all storage files
> (data/indexes,
> >> wal, archive). If the path is changed *all the files* will be under the
> new
> >> directory unless *setWalPath* and *setWalArchivePath* are set
> *explicitly*.
> >> - *setWalPath* overrides the default location of WAL (which is
> >> setPersistencePath)
> >> - *setWalArchivePath* overrides the default location of the archive
> (which
> >> is again has to be setPersistencePath).
> >>
> >> If we follow this approach the configuration and behavior becomes vivid.
> >> Thoughts?
> >>
> >> —
> >> Denis
> >>
> >>> On Oct 13, 2017, at 1:21 AM, Ivan Rakov <ivan.glukos@gmail.com> wrote:
> >>>
> >>> Denis,
> >>>
> >>> Data/index storage and WAL are located under the same root by default.
> >>> However, this is not mandatory: *storagePath* and *walPath* properties
> >> can contain both absolute and relative paths. If paths are absolute,
> >> storage and WAL can reside on different devices, like this:
> >>>> storagePath: /storage1/NMVe_drive/storage
> >>>> walPath: /storage2/Big_SSD_drive/wal
> >>> We even recommend this in tuning guide: https://apacheignite.readme.
> >> io/docs/durable-memory-tuning
> >>> That's why I think *persistencePath* is misleading.
> >>>
> >>> Best Regards,
> >>> Ivan Rakov
> >>>
> >>> On 13.10.2017 5:03, Dmitriy Setrakyan wrote:
> >>>> On Thu, Oct 12, 2017 at 7:01 PM, Denis Magda <dmagda@gridgain.com>
> >> wrote:
> >>>>>  From what I see after running an example they are under the same
> root
> >>>>> folder and in different subdirectories. The root folder should be
> >> defined
> >>>>> by setPersistencePath as I guess.
> >>>>>
> >>>> If that is the case, then you are right. Then we should not have
> >>>> storagePath or WalPath, and store them both under "persistencePath"
> >> root.
> >>>> However, I would need Alexey Goncharuk or Ivan Rakov to confirm this.
> >>>>
> >>
>
>

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