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From Anton Vinogradov ...@apache.org>
Subject Re: Unknown known issue on cache rebalancing delayed
Date Tue, 04 Sep 2018 08:41:49 GMT
Roman,

I see you uncommented this line.
I do not remember deadlock detail, but I remember it was the extremely rare
case.
I found and "fixed" it some days before merge when I had 24x7 sanity check
week :)

So, I propose to have at least 1_000 runs of this tests before keeping this
uncommented.



вт, 21 авг. 2018 г. в 11:08, Maxim Muzafarov <maxmuzaf@gmail.com>:

> Roman,
>
> I worked recently on rebalance improvements and haven't found any problems
> with delayed cache rebalacne.
> Agree with you - let's uncomment this and remove scary comment. Will you
> create a ticket for it?
>
> In case of any problems we can easily detec deadlock with newly configured
> `FailureHandler`.
>
> On Tue, 21 Aug 2018 at 03:49 Roman Shtykh <rshtykh@yahoo.com> wrote:
>
> > Hi Maxim,
> >
> > I have some issues with a cluster with rebalance delay enabled, but need
> > to check more -- if I find it's related I'll share.
> > Just wanted to make sure it's not an issue anymore from someone working
> on
> > rebalancing. We should remove that comment then, it looks scary :)
> >
> > --
> > Roman Shtykh
> >
> >
> > On Tuesday, August 21, 2018, 12:49:00 a.m. GMT+9, Maxim Muzafarov <
> > maxmuzaf@gmail.com> wrote:
> >
> >
> > Hello Roman,
> >
> > Did you faced with real issue of delayed rebalance or it's just only for
> > your personal interest?
> > If yes, please, share details and we will try to help you.
> >
> > As for this comment I don't think he is actual. That change was in 2015.
> > Much has changed
> > within rebalance process since that time. I've uncommented it and
> > rechecked with that
> > cache configuration and haven't seen any failed tests or issues.
> >
> > Probably, that problem was about cache in SYNC mode does not start util
> it
> > loads all data
> > from other nodes. But currently delayed rebalance works the same way as
> > IgniteCache#rebalance(),
> > so you can `setRebalanceDelay` to `-1` and call it manually to check.
> >
> > On Mon, 20 Aug 2018 at 11:19 Roman Shtykh <rshtykh@yahoo.com.invalid>
> > wrote:
> >
> > Igniters,
> > I have found "Known issue, possible deadlock in case of low priority
> cache
> > rebalancing delayed" comment in
> > GridCacheRebalancingSyncSelfTest#getConfiguration.Can you please explain
> > when using rebalance delay can be an issue and why?
> >
> > -- Roman
> >
> > --
> > --
> > Maxim Muzafarov
> >
> --
> --
> Maxim Muzafarov
>

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