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58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
#include <Core/SettingsQuirks.h>
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#include <Core/Settings.h>
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#include <Poco/Environment.h>
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#include <Poco/Platform.h>
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#include <Common/VersionNumber.h>
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#include <common/logger_useful.h>
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#include <cstdlib>
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/// Detect does epoll_wait with nested epoll fds works correctly.
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/// Polling nested epoll fds from epoll_wait is required for async_socket_for_remote and use_hedged_requests.
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///
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/// It may not be reliable in 5.5+ [1], that has been fixed in 5.7+ [2] or 5.6.13+.
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///
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/// [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=339ddb53d373
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/// [2]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0c54a6a44bf3
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bool nestedEpollWorks(Poco::Logger * log)
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{
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if (Poco::Environment::os() != POCO_OS_LINUX)
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return true;
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DB::VersionNumber linux_version(Poco::Environment::osVersion());
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/// the check is correct since there will be no more 5.5.x releases.
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if (linux_version >= DB::VersionNumber{5, 5, 0} && linux_version < DB::VersionNumber{5, 6, 13})
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{
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if (log)
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LOG_WARNING(log, "Nested epoll_wait has some issues on kernels [5.5.0, 5.6.13). You should upgrade it to avoid possible issues.");
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return false;
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}
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return true;
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}
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namespace DB
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{
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/// Update some settings defaults to avoid some known issues.
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void applySettingsQuirks(Settings & settings, Poco::Logger * log)
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{
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if (!nestedEpollWorks(log))
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{
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if (!settings.async_socket_for_remote.changed && settings.async_socket_for_remote)
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{
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settings.async_socket_for_remote = false;
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if (log)
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LOG_WARNING(log, "async_socket_for_remote has been disabled (you can explicitly enable it still)");
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}
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if (!settings.use_hedged_requests.changed && settings.use_hedged_requests)
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{
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settings.use_hedged_requests = false;
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if (log)
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LOG_WARNING(log, "use_hedged_requests has been disabled (you can explicitly enable it still)");
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}
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}
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}
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}
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