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【详述】2.5.20版本降级至2.5.9时往表插入数据时，BE出现different format version, we need to rebuild persistent index
【背景】2.5.20版本降级至2.5.9
【业务影响】暂时只是测试节点，目的是2.5.9升级版本至2.5.20
【是否存算分离】 否
【StarRocks版本】2.5.20、2.5.9
【集群规模】例如：3fe（3 follower ）+3be（fe与be混部）
【机器信息】64C/256G/万兆
【联系方式】社区群13-运维菜鸟
【附件】
补充：
- SR升级测试
- 2.5.9升级至2.5.20正常，2.5.20降级至2.5.9似乎也正常
- 往表insert into数据时出现以下警告，但能插入数据，也能查询到插入的数据，貌似没什么影响。
- 这些警告是否有影响？产生的原因？
- be.WARNING截图
W0509 15:32:21.260493 20326 persistent_index.cpp:2643] delete error l0 index file: index.l0.4.1, status: Not found: index.l0.4.1: No such file or directory
W0509 15:32:21.260535 20330 persistent_index.cpp:2622] different format version, we need to rebuild persistent index
W0509 15:32:21.260545 20327 persistent_index.cpp:2622] different format version, we need to rebuild persistent index
W0509 15:32:21.260582 20330 persistent_index.cpp:2636] load persistent index failed, tablet: 35639, status: Internal error: different format version
W0509 15:32:21.260617 20327 persistent_index.cpp:2636] load persistent index failed, tablet: 35655, status: Internal error: different format version
W0509 15:32:21.260655 20330 persistent_index.cpp:2643] delete error l0 index file: index.l0.1.0, status: Not found: index.l0.1.0: No such file or directory
W0509 15:32:21.260669 20327 persistent_index.cpp:2643] delete error l0 index file: index.l0.1.0, status: Not found: index.l0.1.0: No such file or directory
W0509 15:32:21.260677 20329 persistent_index.cpp:2622] different format version, we need to rebuild persistent index
W0509 15:32:21.260718 20329 persistent_index.cpp:2636] load persistent index failed, tablet: 35643, status: Internal error: different format version
W0509 15:32:21.260740 20329 persistent_index.cpp:2643] delete error l0 index file: index.l0.4.1, status: Not found: index.l0.4.1: No such file or directory
W0509 15:32:22.431856 16931 persistent_index.cpp:2622] different format version, we need to rebuild persistent index
W0509 15:32:22.431900 16931 persistent_index.cpp:2636] load persistent index failed, tablet: 33319, status: Internal error: different format version
W0509 15:32:22.431927 16931 persistent_index.cpp:2643] delete error l0 index file: index.l0.8.1, status: Not found: index.l0.8.1: No such file or directory
W0509 15:32:22.525638 20332 persistent_index.cpp:2622] different format version, we need to rebuild persistent index
W0509 15:32:22.525679 20332 persistent_index.cpp:2636] load persistent index failed, tablet: 33307, status: Internal error: different format version
W0509 15:32:22.525717 20332 persistent_index.cpp:2643] delete error l0 index file: index.l0.1.0, status: Not found: index.l0.1.0: No such file or directory
W0509 15:32:22.525941 20334 persistent_index.cpp:2622] different format version, we need to rebuild persistent index
W0509 15:32:22.525982 20335 persistent_index.cpp:2622] different format version, we need to rebuild persistent index
W0509 15:32:22.525991 20334 persistent_index.cpp:2636] load persistent index failed, tablet: 33323, status: Internal error: different format version
W0509 15:32:22.526031 20335 persistent_index.cpp:2636] load persistent index failed, tablet: 33327, status: Internal error: different format version
W0509 15:32:22.526108 20338 persistent_index.cpp:2622] different format version, we need to rebuild persistent index
W0509 15:32:22.526079 20334 persistent_index.cpp:2643] delete error l0 index file: index.l0.8.1, status: Not found: index.l0.8.1: No such file or directory
W0509 15:32:22.526137 20337 persistent_index.cpp:2622] different format version, we need to rebuild persistent index
W0509 15:32:22.526162 20338 persistent_index.cpp:2636] load persistent index failed, tablet: 33311, status: Internal error: different format version
W0509 15:32:22.526144 20335 persistent_index.cpp:2643] delete error l0 index file: index.l0.8.1, status: Not found: index.l0.8.1: No such file or directory
W0509 15:32:22.526243 20338 persistent_index.cpp:2643] delete error l0 index file: index.l0.8.1, status: Not found: index.l0.8.1: No such file or directory
W0509 15:32:22.526212 20337 persistent_index.cpp:2636] load persistent index failed, tablet: 33315, status: Internal error: different format version