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#include "table_mount_cache_detail.h"
#include "config.h"
#include <yt/yt/core/yson/string.h>
#include <yt/yt/core/ytree/convert.h>
#include <yt/yt/core/profiling/timing.h>
#include <library/cpp/yt/misc/hash.h>
namespace NYT::NTabletClient {
using namespace NConcurrency;
////////////////////////////////////////////////////////////////////////////////
static constexpr auto TabletCacheSweepPeriod = TDuration::Seconds(60);
///////////////////////////////////////////////////////////////////////////////
TTabletInfoCache::TTabletInfoCache(NLogging::TLogger logger)
: Logger(std::move(logger))
{ }
TTabletInfoPtr TTabletInfoCache::Find(TTabletId tabletId)
{
SweepExpiredEntries();
auto guard = ReaderGuard(MapLock_);
ProcessNextGCQueueEntry();
auto it = Map_.find(tabletId);
return it != Map_.end() ? it->second.Lock() : nullptr;
}
TTabletInfoPtr TTabletInfoCache::Insert(const TTabletInfoPtr& tabletInfo)
{
SweepExpiredEntries();
auto guard = WriterGuard(MapLock_);
ProcessNextGCQueueEntry();
typename decltype(Map_)::insert_ctx context;
auto it = Map_.find(tabletInfo->TabletId, context);
if (it != Map_.end()) {
if (auto existingTabletInfo = it->second.Lock()) {
if (tabletInfo->MountRevision < existingTabletInfo->MountRevision) {
THROW_ERROR_EXCEPTION(
EErrorCode::InvalidMountRevision,
"Tablet mount revision %x is outdated",
tabletInfo->MountRevision)
<< TErrorAttribute("tablet_id", tabletInfo->TabletId);
}
for (const auto& owner : existingTabletInfo->Owners) {
if (!owner.IsExpired()) {
tabletInfo->Owners.push_back(owner);
}
}
}
it->second = MakeWeak(tabletInfo);
} else {
Map_.emplace_direct(context, tabletInfo->TabletId, tabletInfo);
guard.Release();
auto gcGuard = Guard(GCLock_);
GCQueue_.push(tabletInfo->TabletId);
}
return tabletInfo;
}
void TTabletInfoCache::Clear()
{
decltype(Map_) other;
{
auto guard = WriterGuard(MapLock_);
other = std::move(Map_);
}
}
void TTabletInfoCache::SweepExpiredEntries()
{
auto now = NProfiling::GetCpuInstant();
auto deadline = ExpiredEntriesSweepDeadline_.load(std::memory_order::relaxed);
if (now < deadline) {
return;
}
if (!ExpiredEntriesSweepDeadline_.compare_exchange_strong(deadline, now + NProfiling::DurationToCpuDuration(TabletCacheSweepPeriod))) {
return;
}
decltype(ExpiredTabletIds_) expiredTabletIds;
{
auto gcGuard = Guard(GCLock_);
expiredTabletIds = std::move(ExpiredTabletIds_);
}
if (!expiredTabletIds.empty()) {
YT_LOG_DEBUG("Start sweeping expired tablet info (ExpiredTabletCount: %v)",
expiredTabletIds.size());
for (auto id : expiredTabletIds) {
auto guard = WriterGuard(MapLock_);
if (auto it = Map_.find(id); it) {
if (it->second.IsExpired()) {
Map_.erase(it);
continue;
}
guard.Release();
auto gcGuard = Guard(GCLock_);
GCQueue_.push(id);
}
}
YT_LOG_DEBUG("Finish sweeping expired tablet info");
}
}
void TTabletInfoCache::ProcessNextGCQueueEntry()
{
VERIFY_SPINLOCK_AFFINITY(MapLock_);
auto gcGuard = Guard(GCLock_);
if (!GCQueue_.empty()) {
const auto& id = GCQueue_.front();
if (auto it = Map_.find(id); it) {
if (it->second.IsExpired()) {
ExpiredTabletIds_.push_back(id);
} else {
GCQueue_.push(id);
}
}
GCQueue_.pop();
}
}
////////////////////////////////////////////////////////////////////////////////
TTableMountCacheBase::TTableMountCacheBase(
TTableMountCacheConfigPtr config,
NLogging::TLogger logger,
NProfiling::TProfiler profiler)
: TAsyncExpiringCache(
config,
logger.WithTag("Cache: TableMount"),
profiler)
, Logger(std::move(logger))
, TabletInfoCache_(Logger)
, Config_(std::move(config))
{ }
TFuture<TTableMountInfoPtr> TTableMountCacheBase::GetTableInfo(const NYPath::TYPath& path)
{
auto [future, requestInitialized] = TAsyncExpiringCache::GetExtended(path);
bool shouldThrow = false;
if (!requestInitialized && !future.IsSet()) {
auto guard = ReaderGuard(SpinLock_);
shouldThrow = Config_->RejectIfEntryIsRequestedButNotReady;
}
if (shouldThrow) {
// COMPAT(babenko): replace with TransientFailure error code.
THROW_ERROR_EXCEPTION(NRpc::EErrorCode::Unavailable,
"Mount info is unavailable, please try again")
<< TError(NTabletClient::EErrorCode::TableMountInfoNotReady,
"Table mount info is not ready, but has already been requested")
<< TErrorAttribute("path", path);
}
return future;
}
TTabletInfoPtr TTableMountCacheBase::FindTabletInfo(TTabletId tabletId)
{
return TabletInfoCache_.Find(tabletId);
}
void TTableMountCacheBase::InvalidateTablet(TTabletInfoPtr tabletInfo)
{
for (const auto& weakOwner : tabletInfo->Owners) {
if (auto owner = weakOwner.Lock()) {
InvalidateTable(owner);
}
}
}
std::pair<std::optional<TErrorCode>, TTabletInfoPtr> TTableMountCacheBase::InvalidateOnError(
const TError& error,
bool forceRetry)
{
static const std::vector<TErrorCode> retriableCodes = {
NTabletClient::EErrorCode::NoSuchTablet,
NTabletClient::EErrorCode::TabletNotMounted,
NTabletClient::EErrorCode::InvalidMountRevision,
NYTree::EErrorCode::ResolveError
};
if (!error.IsOK()) {
for (auto code : retriableCodes) {
if (auto retriableError = error.FindMatching(code)) {
auto tabletId = retriableError->Attributes().Find<TTabletId>("tablet_id");
if (!tabletId) {
continue;
}
auto isTabletUnmounted = retriableError->Attributes().Get<bool>("is_tablet_unmounted", false);
auto tabletInfo = FindTabletInfo(*tabletId);
if (tabletInfo) {
YT_LOG_DEBUG(error,
"Invalidating tablet in table mount cache "
"(TabletId: %v, CellId: %v, MountRevision: %x, IsTabletUnmounted: %v, Owners: %v)",
tabletInfo->TabletId,
tabletInfo->CellId,
tabletInfo->MountRevision,
isTabletUnmounted,
MakeFormattableView(tabletInfo->Owners, [] (auto* builder, const auto& weakOwner) {
if (auto owner = weakOwner.Lock()) {
FormatValue(builder, owner->Path, TStringBuf());
} else {
builder->AppendString(TStringBuf("<expired>"));
}
}));
InvalidateTablet(tabletInfo);
}
std::optional<TErrorCode> retryableErrorCode = code;
if (code == NTabletClient::EErrorCode::TabletNotMounted &&
isTabletUnmounted &&
!forceRetry)
{
retryableErrorCode = std::nullopt;
}
return std::make_pair(retryableErrorCode, tabletInfo);
}
}
}
return std::make_pair(std::nullopt, nullptr);
}
void TTableMountCacheBase::Clear()
{
TAsyncExpiringCache::Clear();
TabletInfoCache_.Clear();
YT_LOG_DEBUG("Table mount info cache cleared");
}
void TTableMountCacheBase::Reconfigure(TTableMountCacheConfigPtr config)
{
TAsyncExpiringCache::Reconfigure(config);
{
auto guard = WriterGuard(SpinLock_);
Config_ = config;
}
YT_LOG_DEBUG("Table mount info cache reconfigured (NewConfig: %v)",
NYson::ConvertToYsonString(config, NYson::EYsonFormat::Text).AsStringBuf());
}
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT::NTabletClient
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