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From "Ruslan Gilemzyanov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-8035) Duplicated events in ContinuousQuery's Events Listener
Date Fri, 23 Mar 2018 13:51:00 GMT
Ruslan Gilemzyanov created IGNITE-8035:
------------------------------------------

             Summary: Duplicated events in ContinuousQuery's Events Listener 
                 Key: IGNITE-8035
                 URL: https://issues.apache.org/jira/browse/IGNITE-8035
             Project: Ignite
          Issue Type: Bug
          Components: cache
    Affects Versions: 2.1
            Reporter: Ruslan Gilemzyanov


We faced with bug in ContinuousQuery's EventListener work in Ignite. I wrote sample project
to demonstrate it.

We started 2 server nodes connected to the one cache.

Topology snapshot became [ver=2, servers=2, clients=0, CPUs=4, heap=3.6GB]

I have put elements in cache (about 50 elements). Elements were distributed between two
nodes approxiamtely in the same amount.

After pushing every element to cache we waited 100ms (to ensure that Listener did his work)
and deleted element from cache. 

Then we stopped one node. (Topology snapshot became [ver=3, servers=1, clients=0, CPUs=4,
heap=1.8GB])

And then some absolutely randomly chosen (deleted from cache to this moment) events came to
other working node with status CREATED (Remind you that we deleted them from cache to this
moment). In our case it was 5 events.

I think this is direct violation of Continuous Query's "exactly once delivery" contract. 

Source code here: https://github.com/ruslangm/ignite-sample

 



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