里面比较迷糊的其实就是status字段的含义 ，直接copy源码了 ，做下记录

public enum GlobalStatus {

    /**
     * Un known global status.
     */
    // Unknown
    UnKnown(0),

    /**
     * The Begin.
     */
    // PHASE 1: can accept new branch registering.
    Begin(1),

    /**
     * PHASE 2: Running Status: may be changed any time.
     */
    // Committing.
    Committing(2),

    /**
     * The Commit retrying.
     */
    // Retrying commit after a recoverable failure.
    CommitRetrying(3),

    /**
     * Rollbacking global status.
     */
    // Rollbacking
    Rollbacking(4),

    /**
     * The Rollback retrying.
     */
    // Retrying rollback after a recoverable failure.
    RollbackRetrying(5),

    /**
     * The Timeout rollbacking.
     */
    // Rollbacking since timeout
    TimeoutRollbacking(6),

    /**
     * The Timeout rollback retrying.
     */
    // Retrying rollback (since timeout) after a recoverable failure.
    TimeoutRollbackRetrying(7),

    /**
     * All branches can be async committed. The committing is NOT done yet, but it can be seen as committed for TM/RM
     * client.
     */
    AsyncCommitting(8),

    /**
     * PHASE 2: Final Status: will NOT change any more.
     */
    // Finally: global transaction is successfully committed.
    Committed(9),

    /**
     * The Commit failed.
     */
    // Finally: failed to commit
    CommitFailed(10),

    /**
     * The Rollbacked.
     */
    // Finally: global transaction is successfully rollbacked.
    Rollbacked(11),

    /**
     * The Rollback failed.
     */
    // Finally: failed to rollback
    RollbackFailed(12),

    /**
     * The Timeout rollbacked.
     */
    // Finally: global transaction is successfully rollbacked since timeout.
    TimeoutRollbacked(13),

    /**
     * The Timeout rollback failed.
     */
    // Finally: failed to rollback since timeout
    TimeoutRollbackFailed(14),

    /**
     * The Finished.
     */
    // Not managed in session MAP any more
    Finished(15);
}

DROP TABLE IF EXISTS `global_table`;
CREATE TABLE `global_table`  (
  `xid` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `transaction_id` bigint(20) DEFAULT NULL,
  `status` tinyint(4) NOT NULL,
  `application_id` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `transaction_service_group` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `transaction_name` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `timeout` int(11) DEFAULT NULL,
  `begin_time` bigint(20) DEFAULT NULL,
  `application_data` varchar(2000) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `gmt_create` datetime(0) DEFAULT NULL,
  `gmt_modified` datetime(0) DEFAULT NULL,
  PRIMARY KEY (`xid`) USING BTREE,
  INDEX `idx_gmt_modified_status`(`gmt_modified`, `status`) USING BTREE,
  INDEX `idx_transaction_id`(`transaction_id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;