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#include <mutex>
#include <Backups/WithRetries.h>
namespace DB
{
WithRetries::WithRetries(Poco::Logger * log_, zkutil::GetZooKeeper get_zookeeper_, const KeeperSettings & settings_, RenewerCallback callback_)
: log(log_)
, get_zookeeper(get_zookeeper_)
, settings(settings_)
, callback(callback_)
, global_zookeeper_retries_info(
log->name(),
log,
settings.keeper_max_retries,
settings.keeper_retry_initial_backoff_ms,
settings.keeper_retry_max_backoff_ms)
{}
WithRetries::RetriesControlHolder::RetriesControlHolder(const WithRetries * parent, const String & name)
: info(parent->global_zookeeper_retries_info)
, retries_ctl(name, info, nullptr)
, faulty_zookeeper(parent->getFaultyZooKeeper())
{}
WithRetries::RetriesControlHolder WithRetries::createRetriesControlHolder(const String & name)
{
return RetriesControlHolder(this, name);
}
void WithRetries::renewZooKeeper(FaultyKeeper my_faulty_zookeeper) const
{
std::lock_guard lock(zookeeper_mutex);
if (!zookeeper || zookeeper->expired())
{
zookeeper = get_zookeeper();
my_faulty_zookeeper->setKeeper(zookeeper);
callback(my_faulty_zookeeper);
}
}
WithRetries::FaultyKeeper WithRetries::getFaultyZooKeeper() const
{
/// We need to create new instance of ZooKeeperWithFaultInjection each time a copy a pointer to ZooKeeper client there
/// The reason is that ZooKeeperWithFaultInjection may reset the underlying pointer and there could be a race condition
/// when the same object is used from multiple threads.
auto faulty_zookeeper = ZooKeeperWithFaultInjection::createInstance(
settings.keeper_fault_injection_probability,
settings.keeper_fault_injection_seed,
zookeeper,
log->name(),
log);
return faulty_zookeeper;
}
}
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