void cleanGlobalTransactionMap(List tranxns) {
    synchronized (tranxns) {
      for (final Object tranxn : tranxns) {
        globalTransactionMap.remove(tranxn);
      }
    }
  }
Get the Global Transaction associated with the calling thread
geode-core/src/main/java/org/apache/geode/internal/jta/TransactionManagerImpl.java