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Posted to users@jena.apache.org by Jie <so...@gmail.com> on 2013/12/09 16:35:16 UTC

error of Journal happened in the tdb transaction

Hello, everyone,

I am working with the Jena TDB and sometimes the following error happens to
me. I wonder if this has been happened to others also? If anyone has idea
about how to solve this?

Thank you very much.

Best Regards
Jie


Caused by: com.hp.hpl.jena.tdb.transaction.TDBTransactionException: Checksum
 error reading from the Journal.
        at com.hp.hpl.jena.tdb.transaction.Journal._read(Journal.java:241)
        at com.hp.hpl.jena.tdb.transaction.Journal._readJournal(Journal
.java:197)
        at com.hp.hpl.jena.tdb.transaction.Journal.access$100(Journal.
java:48)
        at com.hp.hpl.jena.tdb.transaction.Journal$IteratorEntries.
moveToNext(Journal.java:270)
        at com.hp.hpl.jena.tdb.transaction.Journal$IteratorEntries.
moveToNext(Journal.java:251)
        at org.apache.jena.atlas.iterator.IteratorSlotted.hasNext(
IteratorSlotted.java:67)
        at com.hp.hpl.jena.tdb.transaction.JournalControl.replay(
JournalControl.java:245)
        at com.hp.hpl.jena.tdb.transaction.JournalControl.replay(
JournalControl.java:232)
        at com.hp.hpl.jena.tdb.transaction.TransactionManager.processDe
layedReplayQueue(TransactionManager.java:560)
        at com.hp.hpl.jena.tdb.transaction.TransactionManager.writerCom
mitsWorker(TransactionManager.java:492)
        at com.hp.hpl.jena.tdb.transaction.TransactionManager.access$400(
TransactionManager.java:47)
        at com.hp.hpl.jena.tdb.transaction.TransactionManager$TSM_Write
BackEndTxn.writerCommits(TransactionManager.java:224)
        at com.hp.hpl.jena.tdb.transaction.TransactionManager.writerCommits(
TransactionManager.java:785)
        at com.hp.hpl.jena.tdb.transaction.TransactionManager.noteTxnCommit(
TransactionManager.java:620)
        at com.hp.hpl.jena.tdb.transaction.TransactionManager.notifyCommit(
TransactionManager.java:415)
        at com.hp.hpl.jena.tdb.transaction.Transaction.commit(
Transaction.java:155)

Re: error of Journal happened in the tdb transaction

Posted by Andy Seaborne <an...@apache.org>.
On 09/12/13 15:50, Jie wrote:
>  From the code only one process is writing to the TDB, but just before this
> error happen, we used Fuseki to publish the dataset to server to see the
> data, which I thought should not have been a problem. (I suppose that
> publishing the data by Fuseki means execute once the reading trasaction,
> no?)

Fuseki includes a copy of the TDB engine.

When Fuseki starts it will start TDB.  TDB will attempt to replay 
transactions in the journal but if the other TDB is writing the journal, 
chaos will result.

> Caused by: com.hp.hpl.jena.tdb.transaction.TDBTransactionException: Checksum
>  error reading from the Journal.

This suggest that the one TDB engine is reading the journal while 
another is starting up.  This is bad.  While the DB will not be 
corrupted it may become inconsistent (you loose data).

Can you do your updates via Fuseki?

	Andy



>
>
> On 9 December 2013 16:47, Chris Dollin <ch...@epimorphics.com> wrote:
>
>> On Monday, December 09, 2013 04:35:16 PM Jie wrote:
>>
>>> I am working with the Jena TDB and sometimes the following error happens
>> to
>>> me. I wonder if this has been happened to others also? If anyone has idea
>>> about how to solve this?
>>
>> How many processes are writing to the TDB?
>>
>> [If more than one, then that's what's wrong.]
>>
>> Chris
>>
>> who can't remember if reading processes are also dangerous.
>>
>> --
>> "It does not need to take events in their correct order."
>> /Hexwood/
>>
>> Epimorphics Ltd, http://www.epimorphics.com
>> Registered address: Court Lodge, 105 High Street, Portishead, Bristol BS20
>> 6PT
>> Epimorphics Ltd. is a limited company registered in England (number
>> 7016688)
>>
>>
>

Re: error of Journal happened in the tdb transaction

Posted by Jie <so...@gmail.com>.
>From the code only one process is writing to the TDB, but just before this
error happen, we used Fuseki to publish the dataset to server to see the
data, which I thought should not have been a problem. (I suppose that
publishing the data by Fuseki means execute once the reading trasaction,
no?)


On 9 December 2013 16:47, Chris Dollin <ch...@epimorphics.com> wrote:

> On Monday, December 09, 2013 04:35:16 PM Jie wrote:
>
> > I am working with the Jena TDB and sometimes the following error happens
> to
> > me. I wonder if this has been happened to others also? If anyone has idea
> > about how to solve this?
>
> How many processes are writing to the TDB?
>
> [If more than one, then that's what's wrong.]
>
> Chris
>
> who can't remember if reading processes are also dangerous.
>
> --
> "It does not need to take events in their correct order."
> /Hexwood/
>
> Epimorphics Ltd, http://www.epimorphics.com
> Registered address: Court Lodge, 105 High Street, Portishead, Bristol BS20
> 6PT
> Epimorphics Ltd. is a limited company registered in England (number
> 7016688)
>
>

Re: error of Journal happened in the tdb transaction

Posted by Chris Dollin <ch...@epimorphics.com>.
On Monday, December 09, 2013 04:35:16 PM Jie wrote:
 
> I am working with the Jena TDB and sometimes the following error happens to
> me. I wonder if this has been happened to others also? If anyone has idea
> about how to solve this?

How many processes are writing to the TDB?

[If more than one, then that's what's wrong.]

Chris

who can't remember if reading processes are also dangerous.

-- 
"It does not need to take events in their correct order."             /Hexwood/

Epimorphics Ltd, http://www.epimorphics.com
Registered address: Court Lodge, 105 High Street, Portishead, Bristol BS20 6PT
Epimorphics Ltd. is a limited company registered in England (number 7016688)