For what it's worth, I checked out the code that Manas provided 
(https://github.com/manasdebashiskar/akkapersistenceExample) and changed 
the build.scala to use Scala 2.10.4.
That itself changed nothing, and the problem still existed.

However, when I changed the build.scala to use Akka 2.3.5 (ignoring the 
deprecation warnings since Persistent Channels, etc, are now deprecated), 
this problem seems to have gone away.

On Wednesday, 26 March 2014 10:06:23 UTC-4, Martin Krasser wrote:
>
>  
> On 26.03.14 14:20, Manas Kar wrote:
>  
> Thanks Martin for helping me with this. I will keep an eye on this ticket. 
> I realized that I never thanked you for the awesome piece of work you have 
> done on Akka persistence to make our life so easy. 
>  
>
> Thanks you!
>
>  
>  ...Manas
>
> On Wednesday, March 26, 2014 3:46:29 AM UTC-4, Martin Krasser wrote: 
>>
>>  Hi Manas,
>>
>> I can reproduce what you reported and need to investigate that further. I 
>> verified that the written messages are actually deleted and that there are 
>> no additional writes of messages or confirmation markers made by your app. 
>> I'm quite busy with other stuff at the moment, so it may take a while. 
>> Ticket created: https://www.assembla.com/spaces/akka/tickets/3962
>>
>> Thanks for testing and reporting
>>
>> Cheers,
>> Martin
>>
>> On 25.03.14 19:25, Manas Kar wrote:
>>  
>> Hi Martin,  
>>      To answer your previous question nothing happens if I restart my 
>> application. The persisted files don't get deleted. I also tested the code 
>> with a smaller size message and was able to see the same problem.
>>      I have created a very simple runnable application that uses 
>> PersistenceChannel to send messages to a IOWorker that immediately confirms 
>> the message. As stated above; this examples shows how the journal space 
>> keeps growing over time even though the message gets          confirmed and 
>> should be deleted after a while asynchronously.
>>
>>  The code is placed here 
>> <https://github.com/manasdebashiskar/akkapersistenceExample>. 
>>
>> Once again thanks for your help. I am sure it is something that I am 
>> doing wrong because of which only I see this and no-one else seems to be 
>> complaining about. 
>>
>>  ...Manas
>>
>>  
>> On Friday, March 21, 2014 3:49:17 AM UTC-4, Martin Krasser wrote: 
>>>
>>>  
>>> On 19.03.14 15:38, Manas Kar wrote:
>>>  
>>> Hi Martin, 
>>>  I have a process that is running since last Sunday evening using the 
>>> above code base(Given here 
>>> <http://stackoverflow.com/questions/22315418/akka-persistentchannel-does-not-delete-message-from-journal-upon-confirm>)
>>>  
>>> . The journal space has grown to be around 24 GB so far. I am still 
>>> continuing my run to see when the compaction will happen and the "marked 
>>> deleted" messages will be physically deleted. 
>>>
>>>
>>> What happens when you restart the application?
>>>
>>>  The only way my code is different than your example is that my message 
>>> has the size of 8 MB. Could that be playing some role? 
>>>  
>>>
>>> No.
>>>
>>>  
>>> Thanks 
>>>         Manas
>>>
>>>
>>> On Wednesday, March 12, 2014 1:09:38 PM UTC-4, Manas Kar wrote: 
>>>>
>>>> Thanks Martin. 
>>>>  That explains what I am seeing.
>>>>
>>>> On Wednesday, March 12, 2014 12:15:15 PM UTC-4, Martin Krasser wrote: 
>>>>>
>>>>>  
>>>>> On 11.03.14 19:22, Manas Kar wrote:
>>>>>  
>>>>> Hi Martin,  
>>>>>  I observed something that kind of contradicts my previous statement. 
>>>>> It would be correct to say that the size of journal folder is 
>>>>> approximately 
>>>>> half the size of SumOf(messages).
>>>>>
>>>>>   My messages don't get replayed after the configurable times from 
>>>>> the channels. But the journal's are not physically deleted amounting to 
>>>>> large disk usage.
>>>>>  Please find my modified scala code that follows the example you 
>>>>> provided and still leaves residues in journal folder. 
>>>>>  
>>>>>
>>>>> LevelDB doesn't delete entries immediately, it rather marks them as 
>>>>> deleted and physically deletes them during compactions. Details at 
>>>>> http://leveldb.googlecode.com/svn/trunk/doc/impl.html.
>>>>>
>>>>>  
>>>>>  Thanks
>>>>> ...Manas
>>>>>
>>>>>
>>>>> On Tuesday, March 11, 2014 2:19:51 AM UTC-4, Manas Kar wrote: 
>>>>>>
>>>>>> Hi,  
>>>>>>  I am very excited about the latest and the biggest feature of 
>>>>>> Akka2.3.0 that is Persistence. 
>>>>>>  I have posted a question about Akka persistentChannel here. 
>>>>>> <http://stackoverflow.com/questions/22315418/akka-persistentchannel-does-not-delete-message-from-journal-upon-confirm>
>>>>>>  
>>>>>>  Basically I have a persistentChannel that sends some IOWork to a 
>>>>>> destination actor. Destination actor tries to do the work and when 
>>>>>> successfully completes the work or the deadline has no time left it 
>>>>>> sends a 
>>>>>> "confirm" on  the ConfirmablePersistent message.
>>>>>>
>>>>>>  My expectation after reading the documentation was that my message 
>>>>>> will be deleted from the journal after I "confirm" the message but it 
>>>>>> does 
>>>>>> not. Am I doing something wrong here? my requirement is simple persist 
>>>>>> the 
>>>>>> message and delete it after the corresponding IO work is done for the 
>>>>>> message. 
>>>>>>
>>>>>>   Please help.
>>>>>> ...Manas
>>>>>>  
>>>>>  -- 
>>>>> >>>>>>>>>> Read the docs: http://akka.io/docs/
>>>>> >>>>>>>>>> Check the FAQ: 
>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
>>>>> >>>>>>>>>> Search the archives: 
>>>>> https://groups.google.com/group/akka-user
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>>>>>
>>>>>
>>>>> -- 
>>>>> Martin Krasser
>>>>>
>>>>> blog:    http://krasserm.blogspot.com
>>>>> code:    http://github.com/krasserm
>>>>> twitter: http://twitter.com/mrt1nz
>>>>>
>>>>>     
>>> -- 
>>> Martin Krasser
>>>
>>> blog:    http://krasserm.blogspot.com
>>> code:    http://github.com/krasserm
>>> twitter: http://twitter.com/mrt1nz
>>>
>>>    
>> -- 
>> Martin Krasser
>>
>> blog:    http://krasserm.blogspot.com
>> code:    http://github.com/krasserm
>> twitter: http://twitter.com/mrt1nz
>>
>>    
> -- 
> Martin Krasser
>
> blog:    http://krasserm.blogspot.com
> code:    http://github.com/krasserm
> twitter: http://twitter.com/mrt1nz
>
>  

-- 
>>>>>>>>>>      Read the docs: http://akka.io/docs/
>>>>>>>>>>      Check the FAQ: 
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
>>>>>>>>>>      Search the archives: https://groups.google.com/group/akka-user
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