3086487 - SAP HANA Recovery failed in nameserver startup: convert topology failed

The recovery of an SAP HANA database fails with the following error observed in nameserver trace 

[26580]{-1}[-1/-1] 2021-08-11 14:39:13.168949 e Backup           BackupMgr_Manager.cpp(06462) : Aborting recovery because of exception  1: no.110092  (Backup/impl/Backup_Recover.cpp:101) TID: 26580
    Recovery failed in nameserver startup: convert topology failed, No suitable mapping found between source system hosts( hanahost1 (worker,xs_worker) ) and target system hosts( hanahost2(worker) ) due to host roles mismatch
exception throw location:
 1: 0x00007ff5d45526b6 in Diagnose::CallStack::fillTrace(ltt::basic_ostream<char, ltt::char_traits<char> >&, void**, unsigned long, Diagnose::RegisterSet const*, void const*, bool, unsigned long, Diagnose::CallStackModifier*)+0x252 at CallStack.cpp:822 (libhdbbasis.so)
 2: 0x00007ff5d459dde0 in Basis::DefaultCrashHandlers::save_stack_trace(void**, unsigned int, void const*) const [clone .part.0]+0x60 at LttImportProvider.cpp:245 (libhdbbasis.so)
 3: 0x00007ff5d38d0a5d in ltt::exception::init_(ltt::allocator&, char const*, int, int, unsigned long, char const*, void const*)+0x189 at exception.cpp:629 (libhdblttbase.so)
 4: 0x00007ff5d38d0c55 in ltt::exception::exception(char const*, int, ltt::error_code const&, void const*)+0xa1 at exception.cpp:1041 (libhdblttbase.so)
 5: 0x00007ff5df0c5132 in Backup::Backup_Recover::abortRecovery(char const*)+0x30 at Backup_Recover.cpp:101 (libhdbbackup.so)
 6: 0x00007ff5fea397a8 in NameServer::TREXNameServer::abort(char const*, bool)+0x374 at TREXNameServer.cpp:3706 (libhdbns.so)
 7: 0x00007ff5fecd0350 in NameServer::TREXNameServer::assign(NameServer::ServiceStartInfo&) [clone .cold]+0x508 at TREXNameServer.cpp:2170 (libhdbns.so)
 8: 0x0000561c015c73ac in TRexAPI::TREXIndexServer::assign(NameServer::ServiceStartInfo&, bool, TREX_ERROR::TRexError&)+0x108 at TREXIndexServer.cpp:1091 (hdbnameserver)
 9: 0x0000561c015ccf17 in TRexAPI::AssignThread::run(void*)+0x33 at TREXIndexServer.cpp:545 (hdbnameserver)
10: 0x00007ff5d96b1f94 in TrexThreads::PoolThread::run()+0x970 at PoolThread.cpp:462 (libhdbbasement.so)
11: 0x00007ff5d96b3dd0 in TrexThreads::PoolThread::run(void*&)+0x10 at PoolThread.cpp:142 (libhdbbasement.so)
12: 0x00007ff5d4347b45 in Execution::Thread::staticMainImp(Execution::Thread*)+0x531 at Thread.cpp:522 (libhdbbasis.so)
13: 0x00007ff5d43377c8 in Execution::pthreadFunctionWrapper(Execution::Thread*)+0x1e4 at ThreadInterposition.cpp:639 (libhdbbasis.so)
14: 0x00007ff5d39a96da in start_thread+0xc6 (libpthread.so.0)
15: 0x00007ff5d20a727d in __clone+0x69 (libc.so.6)
exception type information:
 - 0: public ltt::exception@0x7ff5d390ec70
[26580]{-1}[-1/-1] 2021-08-11 14:39:13.179632 e Backup           BackupMgr_Manager.cpp(06512) : :::: RECOVERY finished with error: [448] recovery could not be completed, [110092] Recovery failed in nameserver startup: convert topology failed, No suitable mapping found between source system hosts( hanahost1(worker,xs_worker) ) and target system hosts( hanahost2(worker) ) due to host roles mismatch ::::

Disclaimer: Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.

SAP HANA, platform edition

KBA , HAN-DB-BAC , SAP HANA Backup & Recovery , Problem