[infinispan-dev] Transaction table cleanup

[Manik Surtani]

On 19 Oct 2012, at 02:19, Mircea Markus <mircea.markus at jboss.com> wrote:

> 
> On 18 Oct 2012, at 16:41, Manik Surtani wrote:
> 
>> 
>> On 18 Oct 2012, at 17:45, Vladimir Blagojevic <vblagoje at redhat.com> wrote:
>> 
>>> Hey guys,
>>> 
>>> Investigating why EmbeddedCacheManager#cacheRemove hiccups 
>>> DistributedTwoNodesMapReduceTest. As you might recall upon end of 
>>> MapReduceTask there is EmbeddedCacheManager#cacheRemove call to remove 
>>> intermediate caches across the cluster.
> I think you meant ECM#removeCache?
>>> Very often, almost every test 
>>> run, execution of cache remove is blocked by ongoing transactions that 
>>> have not completed - more specifically TransactionTable shows pending 
>>> remote transaction. This in turn prevents cache stop call, which in turn 
>>> causes a timeout on cache remove thus failing the test.
>>> 
>>> MapReduce uses txs in MapReduceManagerImpl#combine - it might well be 
>>> that there is smth wrong there or it could be that somehow 
>> 
>> ^^^ Does this mean that to use Map/Reduce now, we *require* that a transaction manager is available, configured and present?
> Not really. It's only that the problem Vladimir describes only occurs when you run the MR against transactional caches (there is a tx leak which prevents caches to stop, that should be fixed by a pull request I sent).

Ok.  I was just wondering, since Vladimir did say MR uses txs in MapReduceManagerImpl#combine.  Vladimir, could you pls clarify?

--
Manik Surtani
manik at jboss.org
twitter.com/maniksurtani

Platform Architect, JBoss Data Grid
http://red.ht/data-grid

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