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Administrating MarkLogic Server

Rolling Back a Prepared XA Transaction Branch

MarkLogic Server transactions may participate in global, distributed XA transactions. The XA Transaction Manager usually manages the life cycle of transactions participating in an XA transaction, independent of MarkLogic Server. However, it may be necessary to manually rollback the MarkLogic Server portion of a global transaction (called a branch) if the Transaction Manager is unreachable for a long time. For details, see Heuristically Completing a Stalled Transaction in Developing with XCC.

Note

Heuristic completion bypasses the Transaction Manager and the Two Phase Commit process, so it can lead to data integrity problems. Use heuristic completion only as a last resort.

Before the MarkLogic Server branch of an XA transaction is prepared, the transaction may be rolled back from the host status page of the host evaluating the transaction. See Rolling Back a Transaction.

Once the MarkLogic Server branch of an XA transaction enters the prepared state, the transaction appears only on the forest status page of the coordinating forest. To find the coordinating forest, examine the Forest Status page for each forest belonging to the participating database. The transaction will only appear on the status page for the coordinating forest.

To heuristically rollback the MarkLogic Server portion of an XA transaction using the Admin Interface, follow these steps:

  1. Open the Admin Interface in your browser by navigating to http://yourhost:8001.

  2. Click Forests on the left tree menu. The forest summary page appears.

  3. Click the name of the coordinating forest. The Forest Status page appears.

  4. Locate the target transaction in the transaction list. If you do not see a transaction list on the status page, then this forest is not the coordinating forest for any prepared transactions.

  5. Click [rollback] on the right side of the target transaction status to initiate the rollback. The rollback confirmation dialog appears.

  6. Click OK to confirm the rollback. The rollback completion page appears.

  7. Click OK to return to the Forest Status page.

The rolled back transaction enters the “remember abort” state, indicating MarkLogic Server should remember that the local transaction was aborted until the Transaction Manager re-synchronizes the global transaction. Once re-synchronization occurs, the transaction no longer appears in the forest status. For details, see Heuristically Completing a MarkLogic Server Transaction in Developing with XCC.

You may use the Forest Status page to force MarkLogic Server to forget the rollback without waiting for the Transaction Manager. This is not recommended as it leads to errors and, potentially, a loss of data integrity when the Transaction Manager attempts to re-synchronize the global transaction. If forgetting the rollback is necessary, use the [forget] link in the transaction list on the Forest Status.

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