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orientechnologies / orientdb-gremlin

TinkerPop3 Graph Structure Implementation for OrientDB

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Error in multi-threaded environment - getIndexManager

ttschampel opened this issue · comments

commented

When executing in a multi-threaded environment I get errors from calls into OrientGraph.getIndexManager()

Adding makeActiveDb() to the method fixed the problem locally for me.

commented

For OrientDB the rule is that one database instance can be used by a thread, because database instances are not thread safe.
orientechnologies/orientdb#5490 (comment)
#16
http://orientdb.com/docs/last/Java-Multi-Threading.html

commented

I saw the multithreading docs for OrientDB and the accompanying calls to makeActive() in the OrientGraph. My use case was executing a traversal during a txn (checking for the existence of a vertex) which indirectly hit the index manager.

Are you saying things are executing as expected? Perhaps I'm improperly using the API?

commented

I haven't actually tried to explicitly call makeActive when sharing the graph instance - I always went for multiple graph instances (one per thread).

commented

I see #112 has been pulled in. This can be marked as a duplicate of that issue - the changes for 112 are the same I did for a local workaround to get past this problem.