Hi,
Using multiple threads against the same transaction is not supported or
tested, I'm sorry.
Regards,
Thomas
On Wed, Feb 8, 2017 at 3:55 PM, Roland Lohner <loc...@gmail.com> wrote:
> Dear MVStore developers,
>
> I have a question regarding concurrent access of a TransactionMap in one
> transaction.
>
> I create a Transaction and a TransactionMap.
>
> transaction = transactionStore.begin();
> map = transaction.openMap(name);
>
> When multiple threads access this map and do a put operation concurrently
> the following exception occurs:
>
> java.lang.IllegalStateException: An old transaction with the same id is
> still open: 1 [1.4.193/102]
> at org.h2.mvstore.DataUtils.newIllegalStateException(
> DataUtils.java:765)
> at org.h2.mvstore.db.TransactionStore.log(TransactionStore.java:275)
> at org.h2.mvstore.db.TransactionStore$Transaction.
> log(TransactionStore.java:706)
> at org.h2.mvstore.db.TransactionStore$TransactionMap.trySet(
> TransactionStore.java:1104)
> at org.h2.mvstore.db.TransactionStore$TransactionMap.set(
> TransactionStore.java:1027)
> at org.h2.mvstore.db.TransactionStore$TransactionMap.put(
> TransactionStore.java:1005)
>
> Synchronizing org.h2.mvstore.db.TransactionStore.TransactionMap.put(K, V)
> using the TransactionMap itself solves the problem.
> synchronized(map) {
> map.put(key, value);
> }
>
>
> My question is whether this behavior is intentional as MVStore supports
> only 'one transaction - one thread model'?
> Or did I find a bug around
> org.h2.mvstore.db.TransactionStore.Transaction.log(int,
> Object, Object)?
> (As concurrent threads can log in same transaction with same logId=0)
>
> Thanks in advance,
> Roland
>
>
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