[Gluster-devel] Rebalance source code

[Nithya Balachandran]

On 8 June 2017 at 09:35, Raghavendra Gowdappa <rgowdapp at redhat.com> wrote:

>
>
> ----- Original Message -----
> > From: "Tahereh Fattahi" <t28.fattahi at gmail.com>
> > To: "Nithya Balachandran" <nbalacha at redhat.com>, "Susant Palai" <
> spalai at redhat.com>, "Gluster Devel"
> > <gluster-devel at gluster.org>
> > Sent: Wednesday, June 7, 2017 8:05:35 PM
> > Subject: Re: [Gluster-devel] Rebalance source code
> >
> > I had seen this function before but when dht xlator is not loaded in
> server
> > side, how this function will be called?
>
> rebalance process is not a server process.


Well, it runs on the server nodes but it is, as Raghavendra said, a
clustering/client process. I think you probably meant the brick processes
when you referred to the server process.

Other processes which run on the server nodes but load client translators
include the selfheal daemon(AFR/EC) or the tier process (DHT) or even the
NFS server which loads the cluster translators.


> Instead its a client (albeit a special one - doesn't have an interface
> layer like fuse/gfapi, xlator graph is rooted at dht , dht xlator itself
> has the option "rebalance-cmd" set which won't be on normal clients, once
> crawling starts it continues in same graph even if there are graph changes
> during course of rebalance). You can check logs of rebalance process
> (*rebalance*.log in gluster log directory) for the exact set of translators
> loaded.
>
> As to when the crawling starts, it is done when dht gets at least one of
> CHILD_UP/CHILD_DOWN/CHILD_CONNECTING from _all_ of its subvols. You can
> check dht_notify for more details where we create a thread with
> gf_defrag_start as entry function.
>
> >
> > On Wed, Jun 7, 2017 at 4:58 PM, Nithya Balachandran <
> nbalacha at redhat.com >
> > wrote:
> >
> >
> >
> >
> >
> > On 7 June 2017 at 17:31, Tahereh Fattahi < t28.fattahi at gmail.com >
> wrote:
> >
> >
> >
> > Hi
> > I want to follow the process when rebalance command is done.
> > Which files should I read?
> > I see something in cli directory that sends request to another abject.
> But I
> > need to find function that do core operation of rebalance.
> > I expect to see something like this in one function:
> > function rebalance
> > {
> > check all bricks
> > fix_layout for all directories
> > start files migration
> > }
> > Where can I find the core functions of rebalance in server side?
> >
> > You can start with gf_defrag_start_crawl in dht-rebalance.c
> >
> > Regards,
> > Nithya
> >
> >
> >
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> >
> >
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