[infinispan-issues] [JBoss JIRA] (ISPN-2835) Issues w/ M/R test cases if cache are not explicitly started on all nodes

[Dan Berindei (JIRA)]

     [ https://issues.jboss.org/browse/ISPN-2835?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dan Berindei resolved ISPN-2835.
--------------------------------

    Resolution: Cannot Reproduce Bug


This is not a problem in the test setup, not in M/R. 

The test uses {{AbstractCacheTest.getDefaultClusteredCacheConfig()}} to construct the configuration, which disables state transfer. If the cache isn't started on both nodes before the keys are inserted in the cache, one of the nodes will not receive any entries via state transfer and naturally the M/R task won't find any entries there.

I fixed Galder's test by ading this line in the createCacheManagers method:

{code}
      builder.clustering().stateTransfer().fetchInMemoryState(true);
{code}
                
> Issues w/ M/R test cases if cache are not explicitly started on all nodes
> -------------------------------------------------------------------------
>
>                 Key: ISPN-2835
>                 URL: https://issues.jboss.org/browse/ISPN-2835
>             Project: Infinispan
>          Issue Type: Bug
>          Components: Core API, Distributed Execution and Map/Reduce
>            Reporter: Ray Tsang
>            Assignee: Dan Berindei
>              Labels: onboard
>             Fix For: 5.3.0.Final
>
>         Attachments: infinispan.log, mr-test-src.zip
>
>
> I ran into some issues while using M/R.  The gist of the issue I was seeing is that:
> Start a cluster of Embedded Caches, like 4 nodes
> Put in 100 elements
> Run a simple M/R job to count the number of keys
> If I run the M/R job using  the node I'm inserting elements into as coordinator - the result is 100
> But if I run the M/R job using a different node as coordinator, the result is less than 100
> More interestingly, I can pause for 5 seconds and run the M/R jobs again, the results are always less than 100
> This behavior doens't occur if I explicitly run cacheManager.getCache() for each of the nodes...

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