我测试了一步直接升级：
- FE 兼容性测试通过了。
- BE单节点升级， show backends 查看心跳正常， 版本变更成功。
- 但执行查询, be 日志显示有大量报错如下：
报错1： PipelineFragmentContext::cancel|query_id=806ec5860d3b490b-a724d9b998f8c489|fragment_id=3|instance_id=806ec5860d3b490b-a724d9b998f8c48d|reason=INTERNAL_ERROR|message=JdbcExecutorException: Initialize datasource failed:
CAUSED BY: IllegalArgumentException: maxPoolSize cannot be less than 1
报错2：meet error status: [INTERNAL_ERROR]failed to prepare compaction task and calculate permits, tablet_id=266757, compaction_type=1, permit=0, current_permit=0, status=[INTERNAL_ERROR]prepare base compaction with err: [E-2006]There are missed versions among rowsets. prev_rowset version=108247-108247, rowset version=108249-108249
