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From Alexey Goncharuk <alexey.goncha...@gmail.com>
Subject Re: State of initially started cache with CacheRebalanceMode.SYNC ?
Date Tue, 14 Jun 2016 00:57:30 GMT
Kristian,

Got it, thank you for reporting this. Your expectations are correct, there
is an issue with handling of SYNC rebalance mode for dynamically started
cache. If your cache was set in IgniteConfiguration, you would get correct
size without calling rebalance().get();

I created an issue [1] with a fix and currently waiting for CI results. If
all ok, the fix will be merged to master shortly.

[1] https://issues.apache.org/jira/browse/IGNITE-3305

--AG

2016-06-13 11:38 GMT-07:00 Kristian Rosenvold <krosenvold@apache.org>:

> Alexey,
>
> we were discussing what was happening in the 10-20 seconds while the
> cache was being replicated, to find out if any inconsistencies could
> occur in this window. So I started a first node with a known number of
> elements, say 1 million. The testcase I showed in the first code was
> then started as a second replicated node, also with SYNC mode. The
> assertion failed miserably, and neither did a "get" operation block.
> But I did not check what Denis said, that a "get" of an element
> existing in the other node would simply be satisfied by the remote; I
> only did a get for a non-existant element. And the size grew in the
> 10-20 seonds after starting the cache until it reached 1 million.
>
> >So either a cache was created by this call and it's size is equal to
> zero, or it was created prior to this call >and cache size must be the same
> on all nodes in SYNC mode.
>
> This is the latter  case, but it does not appear to behave the way you
> describe. So the second node is basically *started* when the first
> node is up and running with its 1 million cache nodes. The only way I
> could ensure the consistency (I think) you're describing was by doing
> an explicit call to cache.rebalance().get() on the new node.
>
> Kristian
>
>
> 2016-06-13 20:03 GMT+02:00 Alexey Goncharuk <alexey.goncharuk@gmail.com>:
> > Kristian,
> >
> > I am a little bit confused by the example you provided in your first
> e-mail.
> > From the code I see that you create a cache dynamically by calling
> > getOrCreateCache, and the next line asserts that cache size is equal to a
> > knownRemoteCacheSize. This does not make sense to me because cache
> creation
> > is a distributed operation and it is created on all nodes at once. So
> either
> > a cache was created by this call and it's size is equal to zero, or it
> was
> > created prior to this call and cache size must be the same on all nodes
> in
> > SYNC mode.
> >
> > More specifically, SYNC rebalance mode means that Ignition.start() and
> all
> > public Cache API calls will be blocked until after rebalancing for such a
> > cache is finished.
> >
> > --AG
>

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