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37 lines
1.1 KiB
C++
37 lines
1.1 KiB
C++
#include <Interpreters/IExternalLoadable.h>
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#include <Poco/Util/AbstractConfiguration.h>
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#include <cmath>
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namespace DB
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{
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ExternalLoadableLifetime::ExternalLoadableLifetime(const Poco::Util::AbstractConfiguration & config,
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const std::string & config_prefix)
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{
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const auto & lifetime_min_key = config_prefix + ".min";
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const auto has_min = config.has(lifetime_min_key);
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min_sec = has_min ? config.getUInt64(lifetime_min_key) : config.getUInt64(config_prefix);
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max_sec = has_min ? config.getUInt64(config_prefix + ".max") : min_sec;
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}
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UInt64 calculateDurationWithBackoff(pcg64 & rnd_engine, size_t error_count)
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{
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constexpr UInt64 backoff_initial_sec = 5;
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constexpr UInt64 backoff_max_sec = 10 * 60; /// 10 minutes
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if (error_count < 1)
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error_count = 1;
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/// max seconds is 600 and 2 ** 10 == 1024
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if (error_count > 11)
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error_count = 11;
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std::uniform_int_distribution<UInt64> distribution(0, static_cast<UInt64>(std::exp2(error_count - 1)));
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return std::min<UInt64>(backoff_max_sec, backoff_initial_sec + distribution(rnd_engine));
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}
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}
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