Luca,
This is exactly the info that I need right now as I'm having many problems
with concurrent update issues on "root" records, simply from adding
lightweight edges between those records and related vertices.
However, because I'm heavily leveraging tinkerpop/frames, I'm unsure where
and how I can cleanly insert this orient-specific record-locking. Do you
have any suggestions or are there other members who have encountered this
and have suggestions?
At the moment as a workaround I've put off creating the problematic edges
in one case. In another, introduced arbitrary delays in another in order
to try to avoid attempts at concurrent access.
Any help is much appreciated.
Regards,
Jonathan 'J5' Cook
On Saturday, September 21, 2013 9:44:47 AM UTC-4, Lvc@ wrote:
>
> Hi all,
> I've just updated the Performance-Tuning wiki page with a tip to improve
> the cases as the email object.
>
> High concurrent updates
>
> OrientDB has an optimistic concurrency control system, but on very high
> concurrent updates on the few records it could be more efficient locking
> records to avoid retries. You could synchronize the access by yourself or
> by using the storage API. Note that this works only with non-remote
> databases.
>
> ((OStorageEmbedded)db.getStorage()).acquireWriteLock(final ORID
> iRid)((OStorageEmbedded)db.getStorage()).acquireSharedLock(final ORID
> iRid)((OStorageEmbedded)db.getStorage()).releaseWriteLock(final ORID
> iRid)((OStorageEmbedded)db.getStorage()).releaseSharedLock(final ORID iRid)
>
> Example of usage. Writer threads:
>
> try{
> ((OStorageEmbedded)db.getStorage()).acquireWriteLock(record.getIdentity());
>
> // DO SOMETHING} finally {
> ((OStorageEmbedded)db.getStorage()).releaseWriteLock(record.getIdentity());}
>
> Reader threads:
>
> try{
> ((OStorageEmbedded)db.getStorage()).acquireSharedLock(record.getIdentity());
> // DO SOMETHING
> } finally {
>
> ((OStorageEmbedded)db.getStorage()).releaseSharedLock(record.getIdentity());}
>
>
> <https://github.com/orientechnologies/orientdb/wiki/Performance-Tuning#file-system-access-strategy>
>
>
> For more information:
> https://github.com/orientechnologies/orientdb/wiki/Performance-Tuning#high-concurrency
>
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