To add some code, I'm seeing a couple of places in the driver that fails
trying to begin an already in transaction session.
if ( state == State.MARKED_SUCCESS )
{
conn.run( "COMMIT", Collections.<String, Value>emptyMap(),
StreamCollector.NO_OP );
conn.discardAll();
conn.sync();
state = State.SUCCEEDED;
}
In the code above, on conn.sync() is failing and I see that in the neo4j
thread is trying to begin the session which is in IN_TRANSACTION state.
Same thing happens in the code below which is part of
InternalStatementResult.java, when it executes connection.receiveOne():
private boolean tryFetchNext()
{
while ( recordBuffer.isEmpty() )
{
if ( done )
{
return false;
}
connection.receiveOne();
}
return true;
}
Hope this helps,
Matias.
El viernes, 26 de agosto de 2016, 17:57:16 (UTC-3), Matias Burak escribió:
>
> Hi Nigel, I'm not sure but what I've seen is that there is a neo4j.Session
> thread that it's trying to do a 'begin' on a session worker that is already
> IN_TRANSACTION.
> How can I know who is doing that operation that is triggering that thread
> and why it's trying to begin an already started session worker?
>
> El jueves, 4 de agosto de 2016, 18:49:42 (UTC-3), Nigel Small escribió:
>>
>> Hi Matias
>>
>> It's hard to tell without seeing some code. What concurrency are you
>> referring to?
>>
>> I do think we need to fix that error though - it's very unhelpful to a
>> typical application developer. Coincidentally, we're currently working on
>> this part of the code so I'll make sure we improve the error message!
>>
>> Nigel
>>
>> On 3 August 2016 at 20:03, Matias Burak <[email protected]> wrote:
>>
>>> Hi, anyone knows why I am getting this error?
>>>
>>>
>>> 'beginning implicit transaction' cannot be done when a session is in the
>>> 'IN_TRANSACTION' state.
>>>
>>>
>>> This is using java-driver v1.0.4 and bolt 3.0.4
>>>
>>>
>>> It looks that this is happening when the driver is doing a hasNext.
>>>
>>> Is that starting an implicit transaction?
>>>
>>> I think it might have to do with concurrent bolt calls to do certain
>>> operations? It's weird....
>>>
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>>
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