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From Vyacheslav Daradur <daradu...@gmail.com>
Subject Re: question: How data are stored in IgniteCache?
Date Tue, 18 Apr 2017 06:41:45 GMT
Denis, thanks a lot for your explanations.

2017-04-17 21:20 GMT+03:00 Denis Magda <dmagda@apache.org>:

> It depends on a storage. If it’s a relational database and
> isStoreKeepBinary is false then an object will be deserialized upon the
> store invocation and the storage will insert or update a record using
> “INSERT * ..” or “UPDATE * …” statements. Take a look at the code.
>
> —
> Denis
>
> > On Apr 17, 2017, at 5:04 AM, Vyacheslav Daradur <daradurvs@gmail.com>
> wrote:
> >
> >>> When you transfer an object over the wire or put it into a persistent
> > store (withKeepBinary property enabled) then only the byte array is used.
> > If we put objects into persistent store and withKeepBinary property is
> > DISABLED, in wich form it will be stored?
> >
> > 2017-04-16 18:29 GMT+03:00 Denis Magda <dmagda@apache.org>:
> >
> >> 1. When you transfer an object over the wire or put it into a persistent
> >> store (withKeepBinary property enabled) then only the byte array is
> used.
> >> 2. No
> >>
> >> —
> >> Denis
> >>
> >>> On Apr 15, 2017, at 1:51 PM, Vyacheslav Daradur <daradurvs@gmail.com>
> >> wrote:
> >>>
> >>>>> If we use a cache which is configured to use binary mashaller:
> >>>>> 1. In which cases a placed in the cache object (serialized object)
> >> won't
> >>> be wrapped?
> >>>>> 2. In which cases a placed in the cache object won't be serialized
> (to
> >>> byte array) and will be stored as is?
> >>>
> >>> I meant: Are there any cases of described (1,2) situations.
> >>> If yes, which cases?
> >>>
> >>> 2017-04-15 23:44 GMT+03:00 Vyacheslav Daradur <daradurvs@gmail.com>:
> >>>
> >>>> If we use a cache which is configured to use binary mashaller:
> >>>> 1. In which cases a placed in the cache object (serialized object)
> won't
> >>>> be wrapped?
> >>>> 2. In which cases a placed in the cache object won't be serialized (to
> >>>> byte array) and will be stored as is?
> >>>>
> >>>> 2017-04-14 20:03 GMT+03:00 Denis Magda <dmagda@apache.org>:
> >>>>
> >>>>> If a serialized object is stored in an on-heap cache then it will
be
> >>>>> wrapped by BinaryObjectImp but if it’s an off-heap cache then
> >>>>> BinaryObjectOffHeapImpl is used instead.
> >>>>>
> >>>>> —
> >>>>> Denis
> >>>>>
> >>>>>> On Apr 14, 2017, at 12:32 AM, Vyacheslav Daradur <
> daradurvs@gmail.com
> >>>
> >>>>> wrote:
> >>>>>>
> >>>>>>>> when it’s stored in memory in a specific cache partition
> >>>>>> Does that mean that any serialized object is always stored IN
MEMORY
> >> as
> >>>>> is
> >>>>>> wrapped by BinaryObjectImpl?
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>> 2017-04-14 3:42 GMT+03:00 Denis Magda <dmagda@apache.org>:
> >>>>>>
> >>>>>>> A serialized object is always wrapped by BinaryObjectImpl
when it’s
> >>>>> stored
> >>>>>>> in memory in a specific cache partition or you access it
from your
> >>>>>>> application in a form of BinaryObject. However, when you
transfer
> the
> >>>>>>> object over the wire or put it into a persistent store
> >> (withKeepBinary
> >>>>>>> property enabled) then only the byte array is used.
> >>>>>>>
> >>>>>>> —
> >>>>>>> Denis
> >>>>>>>
> >>>>>>>> On Apr 13, 2017, at 12:21 AM, Vyacheslav Daradur <
> >> daradurvs@gmail.com
> >>>>>>
> >>>>>>> wrote:
> >>>>>>>>
> >>>>>>>> Denis, thank you for answers.
> >>>>>>>>
> >>>>>>>> I meant another.
> >>>>>>>>
> >>>>>>>> For example:
> >>>>>>>> Cache queries use a BinaryObjectImpl and a withKeepBinary-mode
use
> >>>>> it, so
> >>>>>>>> looks like all actions on serialized object are make
via a
> >>>>>>> BinaryObjectImpl.
> >>>>>>>>
> >>>>>>>> Does a serialized object always is stored as BinaryObjectImpl
or
> it
> >>>>> will
> >>>>>>> be
> >>>>>>>> wrapped on demand?
> >>>>>>>>
> >>>>>>>> 2017-04-12 22:34 GMT+03:00 Denis Magda <dmagda@apache.org>:
> >>>>>>>>
> >>>>>>>>> A Java wrapper around an actual binary byte array
with some
> >>>>> additional
> >>>>>>>>> fields and methods to work with the serialized data.
> >>>>>>>>>
> >>>>>>>>> —
> >>>>>>>>> Denis
> >>>>>>>>>
> >>>>>>>>>> On Apr 12, 2017, at 8:33 AM, Vyacheslav Daradur
<
> >>>>> daradurvs@gmail.com>
> >>>>>>>>> wrote:
> >>>>>>>>>>
> >>>>>>>>>> In what cases BinaryObjecImpl is used?
> >>>>>>>>>>
> >>>>>>>>>> 2017-04-12 18:08 GMT+03:00 Denis Magda <dmagda@apache.org>:
> >>>>>>>>>>
> >>>>>>>>>>> Hi,
> >>>>>>>>>>>
> >>>>>>>>>>> A cache entry is always stored in a binary
format (byte array)
> >> in a
> >>>>>>>>> cache.
> >>>>>>>>>>> Even when you transfer an entry from one
node to another, as a
> >>>>> result
> >>>>>>> of
> >>>>>>>>>>> cache.put(…), operation the entry will
be serialized into the
> >>>>> binary
> >>>>>>>>> format
> >>>>>>>>>>> and transferred over the wire.
> >>>>>>>>>>>
> >>>>>>>>>>> —
> >>>>>>>>>>> Denis
> >>>>>>>>>>>
> >>>>>>>>>>>> On Apr 12, 2017, at 1:11 AM, Vyacheslav
Daradur <
> >>>>> daradurvs@gmail.com
> >>>>>>>>
> >>>>>>>>>>> wrote:
> >>>>>>>>>>>>
> >>>>>>>>>>>> Hello Igniters!
> >>>>>>>>>>>>
> >>>>>>>>>>>> I have one conceptual question:
> >>>>>>>>>>>>
> >>>>>>>>>>>> When we put an object in IgniteCache,
how it is stored?
> >>>>>>>>>>>>
> >>>>>>>>>>>> As I understand, after marshalling we
have an array of bytes,
> >>>>>>>>>>>> 1) in a local node it is wrapped in
BinaryObjectImpl and
> stored
> >> in
> >>>>>>>>> memory
> >>>>>>>>>>>> 2) it is sent to remote node as byte
array where it will be
> >>>>> wrapped
> >>>>>>> in
> >>>>>>>>>>>> BinaryObjectImpl and be stored in memory
> >>>>>>>>>>>>
> >>>>>>>>>>>> --
> >>>>>>>>>>>> Best Regards, Vyacheslav
> >>>>>>>>>>>
> >>>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>> --
> >>>>>>>>>> Best Regards, Vyacheslav
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>> --
> >>>>>>>> Best Regards, Vyacheslav
> >>>>>>>
> >>>>>>>
> >>>>>>
> >>>>>>
> >>>>>> --
> >>>>>> Best Regards, Vyacheslav
> >>>>>
> >>>>>
> >>>>
> >>>>
> >>>> --
> >>>> Best Regards, Vyacheslav
> >>>>
> >>>
> >>>
> >>>
> >>> --
> >>> Best Regards, Vyacheslav
> >>
> >>
> >
> >
> > --
> > Best Regards, Vyacheslav
>
>


-- 
Best Regards, Vyacheslav

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