On Tue, Sep 13, 2016 at 12:06:00PM -0400, Luis Pabón wrote: > Very good points. Thanks Prasanna for putting this together. I agree with > your comments in that Heketi is the high level abstraction API and it should have > an API similar of what is described by Prasanna. > > I definitely do not think any File Api should be available in Heketi, > because that is an implementation of the Block API. The Heketi API should > be similar to something like OpenStack Cinder. > > I think that the actual management of the Volumes used for Block storage > and the files in them should be all managed by Heketi. How they are > actually created is still to be determined, but we could have Heketi > create them, or have helper programs do that. Maybe a tool like qemu-img? If whatever iscsi service understand the format (at the very least 'raw'), you could get functionality like snapshots pretty simple. Niels > We also need to document the exact workflow to enable a file in > a Gluster volume to be exposed as a block device. This will help > determine where the creation of the file could take place. > > We can capture our decisions from these discussions in the > following page: > > https://github.com/heketi/heketi/wiki/Proposed-Changes > > - Luis > > > ----- Original Message ----- > From: "Humble Chirammal" <hchiramm@xxxxxxxxxx> > To: "Raghavendra Talur" <rtalur@xxxxxxxxxx> > Cc: "Prasanna Kalever" <pkalever@xxxxxxxxxx>, "gluster-devel" <gluster-devel@xxxxxxxxxxx>, "Stephen Watt" <swatt@xxxxxxxxxx>, "Luis Pabon" <lpabon@xxxxxxxxxx>, "Michael Adam" <madam@xxxxxxxxxx>, "Ramakrishna Yekulla" <rreddy@xxxxxxxxxx>, "Mohamed Ashiq Liyazudeen" <mliyazud@xxxxxxxxxx> > Sent: Tuesday, September 13, 2016 2:23:39 AM > Subject: Re: [Heketi] Block store related API design discussion > > > > > > ----- Original Message ----- > | From: "Raghavendra Talur" <rtalur@xxxxxxxxxx> > | To: "Prasanna Kalever" <pkalever@xxxxxxxxxx> > | Cc: "gluster-devel" <gluster-devel@xxxxxxxxxxx>, "Stephen Watt" <swatt@xxxxxxxxxx>, "Luis Pabon" <lpabon@xxxxxxxxxx>, > | "Michael Adam" <madam@xxxxxxxxxx>, "Humble Chirammal" <hchiramm@xxxxxxxxxx>, "Ramakrishna Yekulla" > | <rreddy@xxxxxxxxxx>, "Mohamed Ashiq Liyazudeen" <mliyazud@xxxxxxxxxx> > | Sent: Tuesday, September 13, 2016 11:08:44 AM > | Subject: Re: [Heketi] Block store related API design discussion > | > | On Mon, Sep 12, 2016 at 11:30 PM, Prasanna Kalever <pkalever@xxxxxxxxxx> > | wrote: > | > | > Hi all, > | > > | > This mail is open for discussion on gluster block store integration with > | > heketi and its REST API interface design constraints. > | > > | > > | > ___ Volume Request ... > | > | > | > | > | > PVC claim -> Heketi --->| > | > | > | > | > | > | > | > | > | > | __ BlockCreate > | > | | > | > | |__ BlockInfo > | > | | > | > |___ Block Request (APIS)-> |__ BlockResize > | > | > | > |__ BlockList > | > | > | > |__ BlockDelete > | > > | > Heketi will have block API and volume API, when user submit a Persistent > | > volume claim, Kubernetes provisioner based on the storage class(from PVC) > | > talks to heketi for storage, heketi intern calls block or volume API's > | > based on request. > | > > | > | This is probably wrong. It won't be Heketi calling block or volume APIs. It > | would be Kubernetes calling block or volume API *of* Heketi. > | > | > | > With my limited understanding, heketi currently creates clusters from > | > provided nodes, creates volumes and handover them to the user. > | > For block related API's, it has to deal with files right ? > | > > | > Here is how block API's look like in short- > | > Create: heketi has to create file in the volume and export it as a iscsi > | > target device and hand it over to user. > | > Info: show block stores information across all the clusters, connection > | > info, size etc. > | > resize: resize the file in the volume, refresh connections from initiator > | > side > | > List: List the connections > | > Delete: logout the connections and delete the file in the gluster volume > | > > | > Couple of questions: > | > 1. Should Block API have sub API's such as FileCreate, FileList, > | > FileResize, File delete and etc then get it used in Block API as they > | > mostly deal with files. > | > > | > | IMO, Heketi should not expose any File related API. It should only have > | APIs to service request for block devices; how the block devices are > | created and modified is an implementation detail. > | > | > | > 2. How do we create the actual file in the volume, meaning using FUSE > | > mount (which may involve an extra process running) or gfapi, again if gfapi > | > should we go with c API's, python bindings or go bindings ? > | > > | 3. Should we get targetcli related (LUN exporting) setup done from heketi > | > or do we seek help from gdeploy for this ? > | > > | > | I would prefer to either have it in Heketi or in Kubernetes. If the API in > | Heketi promises just the creation of block device, then the rest of the > | implementation should be in Kubernetes(the export part). If the API in > | Heketi promises create and export both, I would say Heketi should have the > | implementation within itself. > | > | > > IMO, we should not think about how the clients ( ex: k8s) use it, because there may be different clients. > We should concentrate mainly on 'in/out' of block API in Heketi. Regardless of which client, the API should act the same way. > > --Humble > _______________________________________________ > Gluster-devel mailing list > Gluster-devel@xxxxxxxxxxx > http://www.gluster.org/mailman/listinfo/gluster-devel
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