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1707
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The change is now ready for review:
https://github.com/apache/ignite/pull/1707
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://ci.ignite.apache.org/project.html?projectId=IgniteTests&branch_IgniteTests=pull/1645/head
Regards
Mike
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Excellent discovery, thanks Michael!
I would suggest doing the following. If we see that a number of partitions is a
power of two then the new algorithm will be applied, otherwise the warning will
be printed out and the *old* one approach will be used. Does this resolver all
the concerns?
Mich
On Wed, Mar 15, 2017 at 9:51 AM, Michael Griggs wrote:
> Have we ever heard of somebody needing to set the partition count to a
> non-power-of-two number? Perhaps we could restrict the method so that it
> will only accept a power of two as the partition count?
>
As Valentin suggested, we should
]
Sent: 15 March 2017 16:22
To: dev@ignite.apache.org
Subject: Re: Distribution of keys to partitions
Andrey,
Absolutely, your point is correct. I'm talking about default behavior which
must be as effective as possible. In case we do this optimization, I would also
show a warning if numb
Andrey,
Absolutely, your point is correct. I'm talking about default behavior which
must be as effective as possible. In case we do this optimization, I would
also show a warning if number of partitions is not a power of two.
-Val
On Wed, Mar 15, 2017 at 5:09 PM, Andrey Gura wrote:
> Anyway, w
ions is modified to a non-power-of-two value?
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Anyway, we can't always use this optimization because it will not work
for non power of two values.
On Wed, Mar 15, 2017 at 6:48 PM, Valentin Kulichenko
wrote:
> In 99% of cases number of partition is a power of two, because it's the
> default value. Almost no one changes it. If this change actua
In 99% of cases number of partition is a power of two, because it's the
default value. Almost no one changes it. If this change actually provides
better distribution, it absolutely makes sense to do it.
Michael, can you create a Jira ticket and put you findings there?
-Val
On Wed, Mar 15, 2017 a
Michael,
it makes sense only for cases when partitions count is power of two.
Affinity function doesn't have this limitation.
Bu, of course, we can check, that partitions count is power of two and
use optimized hash code calculation.
On Wed, Mar 15, 2017 at 4:09 PM, Michael Griggs
wrote:
> Hi
Hi Igniters,
Last week I was working with a group of Ignite users. They are inserting
several million string keys in to a cache. Each string key was
approximately 22-characters in length. When I exported the partition
counts (via GG Visor) I was able to see an unusual periodicity in the
number
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