2.1.9 报错There is no scanNode Backend available

Doris版本：2.1.9

查看事务存在大量的报错

且在监控中看还存在断点的情况

日志中看在该时间段存在大量的Fail to write into Socket

W20250506 16:11:45.107302 117462 http_rpc_protocol.cpp:952] Fail to write into Socket{id=25769906063 fd=1987 addr=172.16.71.162:57666:18060} (0x7f4212127e80): Unknown error 1014 [1014]
        2#  std::_Function_handler<void (), doris::PInternalServiceImpl::cancel_plan_fragment(google::protobuf::RpcController*, doris::PCancelPlanFragmentRequest const*, doris::PCancelPlanFragmentResul
t*, google::protobuf::Closure*)::$_0>::_M_invoke(std::_Any_data const&) at /home/zcp/repo_center/doris_release/doris/be/src/service/internal_service.cpp:0
        2#  std::_Function_handler<void (), doris::PInternalServiceImpl::cancel_plan_fragment(google::protobuf::RpcController*, doris::PCancelPlanFragmentRequest const*, doris::PCancelPlanFragmentResul
t*, google::protobuf::Closure*)::$_0>::_M_invoke(std::_Any_data const&) at /home/zcp/repo_center/doris_release/doris/be/src/service/internal_service.cpp:0
W20250506 16:11:45.107229 117305 http_rpc_protocol.cpp:952] Fail to write into Socket{id=34359767784 fd=9211 addr=172.16.71.160:43760:18060} (0x7f2e3ff1bcc0): Unknown error 1014 [1014]
W20250506 16:11:45.109807 117677 http_rpc_protocol.cpp:952] Fail to write into Socket{id=8589972792 fd=7504 addr=172.16.71.160:36462:18060} (0x7f3747fc0000): Unknown error 1014 [1014]
W20250506 16:11:45.109972 117743 http_rpc_protocol.cpp:952] Fail to write into Socket{id=60129545310 fd=675 addr=172.16.71.162:57872:18060} (0x7f436b0a19c0): Unknown error 1014 [1014]
        2#  std::_Function_handler<void (), doris::PInternalServiceImpl::cancel_plan_fragment(google::protobuf::RpcController*, doris::PCancelPlanFragmentRequest const*, doris::PCancelPlanFragmentResul
t*, google::protobuf::Closure*)::$_0>::_M_invoke(std::_Any_data const&) at /home/zcp/repo_center/doris_release/doris/be/src/service/internal_service.cpp:0
        2#  std::_Function_handler<void (), doris::PInternalServiceImpl::cancel_plan_fragment(google::protobuf::RpcController*, doris::PCancelPlanFragmentRequest const*, doris::PCancelPlanFragmentResul
t*, google::protobuf::Closure*)::$_0>::_M_invoke(std::_Any_data const&) at /home/zcp/repo_center/doris_release/doris/be/src/service/internal_service.cpp:0
W20250506 16:11:45.142513 117539 http_rpc_protocol.cpp:952] Fail to write into Socket{id=25769805616 fd=5531 addr=172.16.71.162:57780:18060} (0x7f43a29a8240): Unknown error 1014 [1014]
W20250506 16:11:45.142652 117702 http_rpc_protocol.cpp:952] Fail to write into Socket{id=51539706996 fd=4106 addr=172.16.71.162:56160:18060} (0x7f3f3fa79cc0): Unknown error 1014 [1014]
W20250506 16:11:45.142871 117687 http_rpc_protocol.cpp:952] Fail to write into Socket{id=77309469651 fd=9210 addr=172.16.71.162:44174:18060} (0x7f38e45a8d00): Unknown error 1014 [1014]
W20250506 16:11:45.143105 117570 http_rpc_protocol.cpp:952] Fail to write into Socket{id=60129645546 fd=647 addr=172.16.71.160:46162:18060} (0x7f4199d2c280): Unknown error 1014 [1014]
W20250506 16:11:45.142668 117763 http_rpc_protocol.cpp:952] Fail to write into Socket{id=34359845949 fd=3642 addr=172.16.71.160:45784:18060} (0x7f3e64cbd100): Unknown error 1014 [1014]
W20250506 16:11:45.143090 117679 http_rpc_protocol.cpp:952] Fail to write into Socket{id=25769906063 fd=1987 addr=172.16.71.162:57666:18060} (0x7f4212127e80): Unknown error 1014 [1014]
W20250506 16:11:45.143414 117754 http_rpc_protocol.cpp:952] Fail to write into Socket{id=8589984248 fd=672 addr=172.16.71.162:56696:18060} (0x7f3a89f5f400): Unknown error 1014 [1014]
W20250506 16:11:45.143759 117755 http_rpc_protocol.cpp:952] Fail to write into Socket{id=42949705530 fd=3685 addr=172.16.71.160:45790:18060} (0x7f3eb41197c0): Unknown error 1014 [1014]
W20250506 16:11:45.148716 117648 http_rpc_protocol.cpp:952] Fail to write into Socket{id=94489358369 fd=9431 addr=172.16.71.162:57236:18060} (0x7f429d389500): Unknown error 1014 [1014]

这种问题从哪里下手排查