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https://issues.apache.org/jira/browse/GEODE-4748?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16384289#comment-16384289
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Dan Smith commented on GEODE-4748:
----------------------------------

Can you describe the symptoms you are seeing when you *drop* packets, as 
opposed to *tamper* with them? What I would expect is that if you are dropping 
packets the commit message may be delayed, or eventually a member will be 
kicked out of the system, but you won't see the serialization errors that are 
in the attached [^geode-4748.log]

 

Do you see similar errors with SSL enabled if you are tampering with packets?

> Geode put may result in inconsistent cache if network problem occurs or 
> serialization of key or value class fails
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: GEODE-4748
>                 URL: https://issues.apache.org/jira/browse/GEODE-4748
>             Project: Geode
>          Issue Type: Bug
>          Components: membership, regions
>    Affects Versions: 1.0.0-incubating, 1.1.0, 1.1.1, 1.2.0, 1.3.0, 1.2.1, 
> 1.4.0
>            Reporter: Vadim Lotarev
>            Priority: Critical
>         Attachments: clumsy.jpg, geode-4748.log
>
>
> Geode cache became inconsistent in case if networking and serialization 
> problems occur at commit time. How to reproduce:
> # create any simple _replicated_ region
> # run two nodes
> # put some value in the region (within a transaction or not)
> # execute query on both nodes to check that the same value is returned (I 
> used JMX for that)
> # emulate somehow temporary networking or serialization error (throw 
> IOException from toData() or use [clumsy|https://jagt.github.io/clumsy/] to 
> emulate network interruption)
> # repeat [#3], exception should occur
> # repeat [#4] - you should see different values on different nodes
> It looks like errors occurred after {{TXState.applyChanges}} produce 
> inconsistency - it is impossible to rollback applied local changes what leads 
> to the state where local cache contains  changed data but other node(s) old 
> data (before changes made in transaction).
> To me, consistency is a key property for the systems like Geode so I would 
> consider this bug as a critical one.



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