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Describe reasons when query profiler cannot work

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This commit is contained in:
Alexey Milovidov 2020-02-16 09:49:24 +03:00
parent 6f51f089ec
commit 63b7d6e5ac
1 changed files with 19 additions and 0 deletions
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19
dbms/programs/server/Server.cpp
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@ -578,6 +578,25 @@ int Server::main(const std::vector<std::string> & /*args*/)
global_context->initializeTraceCollector();
#endif
/// Describe multiple reasons when query profiler cannot work.
#if !USE_UNWIND
LOG_INFO(log, "Query Profiler and TraceCollector are disabled because they cannot work without bundled unwind library.");
#endif
#if WITH_COVERAGE
LOG_INFO(log, "Query Profiler and TraceCollector are disabled because they work extremely slow with test coverage.");
#endif
#if defined(SANITIZER)
LOG_INFO(log, "Query Profiler and TraceCollector are disabled because they cannot work under sanitizers"
" when two different stack unwinding methods will interfere with each other.");
#endif
if (!hasPHDRCache())
LOG_INFO(log, "Query Profiler and TraceCollector are disabled because they require PHDR cache to be created"
" (otherwise the function 'dl_iterate_phdr' is not lock free and async-signal safe).");
global_context->setCurrentDatabase(default_database);
if (has_zookeeper && config().has("distributed_ddl"))