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Posted to oak-dev@jackrabbit.apache.org by Abhijit Mazumder <ab...@gmail.com> on 2014/06/25 19:03:23 UTC
Blob and Nodes interaction
Hi,
This is my first mail to Oak mailing list. I tried to search markmail and
existing documentation to understand the interaction between blob and nodes
collection, but I am not able to find any reference to understand
1) Based on what size data goes in blob collection
2) Is there any reference between Nodes and blob collection
3) Is there a flow diagram from where I can find how exactly a content is
getting loaded from Mongo to UI
If somebody can point me to relevant classes or any other reference that
would be great
Regards,
Abhijit
Re: Blob and Nodes interaction
Posted by Abhijit Mazumder <ab...@gmail.com>.
Thanks Chetan, for the helpful info.
Yes you are correct I am talking about MongoBlobStore here.
I tried to find out the reference by using following query
db.nodes.find({blobId:{$exists:true}}. It returns nothing. Can you please
point me to the query I need to use to see the reference at work
My higher level objective is to understand , how Data is stored in Mongo DB
from say a page. When an user create a page and add some contents to it I
understand different nodes are getting created; but what exactly is driving
storing data in blob and interaction between node and blobs collection
Regards,
Abhijit
On Thu, Jun 26, 2014 at 12:58 PM, Chetan Mehrotra <chetan.mehrotra@gmail.com
> wrote:
> Looks like you are using the default MongoBlobStore. Based on that
>
> > 1) Based on what size data goes in blob collection
>
> For MongoBlobStore that is determined via
> org.apache.jackrabbit.oak.spi.blob.AbstractBlobStore#blockSizeMin
> which defaults to 4096
>
> > 2) Is there any reference between Nodes and blob collection
>
> The BlobId created for Binaries referred in Node property are stored
> in Node Document. Those blobId are for the document in Blob collection
>
> > 3) Is there a flow diagram from where I can find how exactly a content is
> getting loaded from Mongo to UI
>
> Which UI? These are mostly internal implementation details and you
> would have to refer to code for that.
>
> btw whats the higher level objective here. That might help us to clarify
> better
> Chetan Mehrotra
>
>
> On Wed, Jun 25, 2014 at 10:33 PM, Abhijit Mazumder
> <ab...@gmail.com> wrote:
> > Hi,
> > This is my first mail to Oak mailing list. I tried to search markmail
> and
> > existing documentation to understand the interaction between blob and
> nodes
> > collection, but I am not able to find any reference to understand
> > 1) Based on what size data goes in blob collection
> > 2) Is there any reference between Nodes and blob collection
> > 3) Is there a flow diagram from where I can find how exactly a content is
> > getting loaded from Mongo to UI
> >
> > If somebody can point me to relevant classes or any other reference that
> > would be great
> >
> > Regards,
> > Abhijit
>
Re: Blob and Nodes interaction
Posted by Chetan Mehrotra <ch...@gmail.com>.
Looks like you are using the default MongoBlobStore. Based on that
> 1) Based on what size data goes in blob collection
For MongoBlobStore that is determined via
org.apache.jackrabbit.oak.spi.blob.AbstractBlobStore#blockSizeMin
which defaults to 4096
> 2) Is there any reference between Nodes and blob collection
The BlobId created for Binaries referred in Node property are stored
in Node Document. Those blobId are for the document in Blob collection
> 3) Is there a flow diagram from where I can find how exactly a content is
getting loaded from Mongo to UI
Which UI? These are mostly internal implementation details and you
would have to refer to code for that.
btw whats the higher level objective here. That might help us to clarify better
Chetan Mehrotra
On Wed, Jun 25, 2014 at 10:33 PM, Abhijit Mazumder
<ab...@gmail.com> wrote:
> Hi,
> This is my first mail to Oak mailing list. I tried to search markmail and
> existing documentation to understand the interaction between blob and nodes
> collection, but I am not able to find any reference to understand
> 1) Based on what size data goes in blob collection
> 2) Is there any reference between Nodes and blob collection
> 3) Is there a flow diagram from where I can find how exactly a content is
> getting loaded from Mongo to UI
>
> If somebody can point me to relevant classes or any other reference that
> would be great
>
> Regards,
> Abhijit