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3 results found

  1. XA Support

    Is there any plan to implement distributed transaction that involves more than one data stores (for e.g. an RDBMS and Mongo)? We have one such requirement and tried a simple POC by creating a simple class extending XAResource (MongoXAResource implements XAResource) and overriding below methods.

    @Override
    public void commit(Xid xid, boolean b) throws XAException {
    clientSession.commitTransaction();
    }

    @Override
    public void rollback(Xid xid) throws XAException {
    clientSession.abortTransaction();
    }

    It appears to work but i think there is a lot more to do. Is there any plan to implement by MongoDB team?

    49 votes

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    10 comments  ·  Transactions  ·  Admin →
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  2. Support for Transaction Savepoints (Nested Transactions)

    The ability to partially rollback transactions to a specified point.

    2 votes

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  3. Lock the document field (not the entire document)

    Hi
    according to this reference: https://www.mongodb.com/blog/post/how-to-select--for-update-inside-mongodb-transactions

    When I lock a document with a field with a new ObjectID, the whole document is locked!

    Idea :

    Operations:
    i have three fields : A , B , C
    I locked field A with new ObjectID in transaction T1.
    i locked field B with new ObjectID in transaction T2.

    Behaviors (high performance) :
    - In transaction T2: if field A is updated, writeConflict error occurs.
    - In transaction T1: if field B is updated, writeConflict error occurs.
    - Outside of transactions: If field A is updated, it waits for …

    1 vote

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    0 comments  ·  Transactions  ·  Admin →
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