Storage provider that reads ntuple pages from a DAOS container.

Definition at line 152 of file RPageStorageDaos.hxx.

Public Member Functions
	RPageSourceDaos (std::string_view ntupleName, std::string_view uri, const ROOT::RNTupleReadOptions &options)

	~RPageSourceDaos () override

std::string	GetObjectClass () const
	Return the object class used for user data OIDs in this ntuple.

std::vector< std::unique_ptr< ROOT::Internal::RCluster > >	LoadClusters (std::span< ROOT::Internal::RCluster::RKey > clusterKeys) final
	Populates all the pages of the given cluster ids and columns; it is possible that some columns do not contain any pages.

void	LoadSealedPage (ROOT::DescriptorId_t physicalColumnId, RNTupleLocalIndex localIndex, RSealedPage &sealedPage) final
	Read the packed and compressed bytes of a page into the memory buffer provided by `sealedPage`.

Public Member Functions inherited from ROOT::Internal::RPageSource
	RPageSource (const RPageSource &)=delete

	RPageSource (RPageSource &&)=delete

	RPageSource (std::string_view ntupleName, const ROOT::RNTupleReadOptions &fOptions)

	~RPageSource () override

ColumnHandle_t	AddColumn (ROOT::DescriptorId_t fieldId, ROOT::Internal::RColumn &column) override
	Register a new column.

void	Attach (ROOT::Internal::RNTupleSerializer::EDescriptorDeserializeMode mode=ROOT::Internal::RNTupleSerializer::EDescriptorDeserializeMode::kForReading)
	Open the physical storage container and deserialize header and footer.

std::unique_ptr< RPageSource >	Clone () const
	Open the same storage multiple time, e.g.

void	DropColumn (ColumnHandle_t columnHandle) override
	Unregisters a column.

REntryRange	GetEntryRange () const

ROOT::NTupleSize_t	GetNElements (ColumnHandle_t columnHandle)

ROOT::NTupleSize_t	GetNEntries ()

const ROOT::RNTupleReadOptions &	GetReadOptions () const

const RSharedDescriptorGuard	GetSharedDescriptorGuard () const
	Takes the read lock for the descriptor.

EPageStorageType	GetType () final
	Whether the concrete implementation is a sink or a source.

virtual ROOT::Internal::RPageRef	LoadPage (ColumnHandle_t columnHandle, RNTupleLocalIndex localIndex)
	Another version of `LoadPage` that allows to specify cluster-relative indexes.

virtual ROOT::Internal::RPageRef	LoadPage (ColumnHandle_t columnHandle, ROOT::NTupleSize_t globalIndex)
	Allocates and fills a page that contains the index-th element.

void	LoadStructure ()
	Loads header and footer without decompressing or deserializing them.

RPageSource &	operator= (const RPageSource &)=delete

RPageSource &	operator= (RPageSource &&)=delete

void	RegisterStreamerInfos ()
	Builds the streamer info records from the descriptor's extra type info section.

void	SetEntryRange (const REntryRange &range)
	Promise to only read from the given entry range.

RResult< ROOT::Internal::RPage >	UnsealPage (const RSealedPage &sealedPage, const ROOT::Internal::RColumnElementBase &element)

void	UnzipCluster (ROOT::Internal::RCluster *cluster)
	Parallel decompression and unpacking of the pages in the given cluster.

Public Member Functions inherited from ROOT::Internal::RPageStorage
	RPageStorage (const RPageStorage &other)=delete

	RPageStorage (RPageStorage &&other)=default

	RPageStorage (std::string_view name)

virtual	~RPageStorage ()

ROOT::DescriptorId_t	GetColumnId (ColumnHandle_t columnHandle) const

virtual ROOT::Experimental::Detail::RNTupleMetrics &	GetMetrics ()
	Returns the default metrics object.

const std::string &	GetNTupleName () const
	Returns the NTuple name.

RPageStorage &	operator= (const RPageStorage &other)=delete

RPageStorage &	operator= (RPageStorage &&other)=default

void	SetTaskScheduler (RTaskScheduler *taskScheduler)

Protected Member Functions
ROOT::RNTupleDescriptor	AttachImpl (ROOT::Internal::RNTupleSerializer::EDescriptorDeserializeMode mode) final
	`LoadStructureImpl()` has been called before `AttachImpl()` is called

std::unique_ptr< RPageSource >	CloneImpl () const final
	The cloned page source creates a new connection to the pool/container.

void	LoadStructureImpl () final

Protected Member Functions inherited from ROOT::Internal::RPageSource
void	EnableDefaultMetrics (const std::string &prefix)
	Enables the default set of metrics provided by RPageSource.

RExclDescriptorGuard	GetExclDescriptorGuard ()
	Note that the underlying lock is not recursive. See `GetSharedDescriptorGuard()` for further information.

void	PrepareLoadCluster (const ROOT::Internal::RCluster::RKey &clusterKey, ROOT::Internal::ROnDiskPageMap &pageZeroMap, std::function< void(ROOT::DescriptorId_t, ROOT::NTupleSize_t, const ROOT::RClusterDescriptor::RPageInfo &)> perPageFunc)
	Prepare a page range read for the column set in `clusterKey`.

virtual void	UnzipClusterImpl (ROOT::Internal::RCluster *cluster)

Protected Member Functions inherited from ROOT::Internal::RPageStorage
void	WaitForAllTasks ()

Private Member Functions
ROOT::Internal::RPageRef	LoadPageImpl (ColumnHandle_t columnHandle, const RClusterInfo &clusterInfo, ROOT::NTupleSize_t idxInCluster) final

Private Attributes
std::unique_ptr< ROOT::Internal::RClusterPool >	fClusterPool
	The cluster pool asynchronously preloads the next few clusters.

ROOT::Internal::RCluster *	fCurrentCluster = nullptr
	The last cluster from which a page got loaded. Points into fClusterPool->fPool.

std::unique_ptr< RDaosContainer >	fDaosContainer
	A container that stores object data (header/footer, pages, etc.)

ROOT::Internal::RNTupleDescriptorBuilder	fDescriptorBuilder

ntuple_index_t	fNTupleIndex {0}

std::string	fURI
	A URI to a DAOS pool of the form 'daos://pool-label/container-label'.

Additional Inherited Members
Public Types inherited from ROOT::Internal::RPageStorage
using	ColumnHandle_t = RColumnHandle
	The column handle identifies a column with the current open page storage.

using	SealedPageSequence_t = std::deque<RSealedPage>

Static Public Member Functions inherited from ROOT::Internal::RPageSource
static std::unique_ptr< RPageSource >	Create (std::string_view ntupleName, std::string_view location, const ROOT::RNTupleReadOptions &options=ROOT::RNTupleReadOptions())
	Guess the concrete derived page source from the file name (location)

static RResult< ROOT::Internal::RPage >	UnsealPage (const RSealedPage &sealedPage, const ROOT::Internal::RColumnElementBase &element, ROOT::Internal::RPageAllocator &pageAlloc)
	Helper for unstreaming a page.

Static Public Attributes inherited from ROOT::Internal::RPageStorage
static constexpr std::size_t	kNBytesPageChecksum = sizeof(std::uint64_t)
	The page checksum is a 64bit xxhash3.

Protected Attributes inherited from ROOT::Internal::RPageSource
RActivePhysicalColumns	fActivePhysicalColumns
	The active columns are implicitly defined by the model fields or views.

std::unique_ptr< RCounters >	fCounters

ROOT::RNTupleReadOptions	fOptions

ROOT::Internal::RPagePool	fPagePool
	Pages that are unzipped with IMT are staged into the page pool.

Protected Attributes inherited from ROOT::Internal::RPageStorage
ROOT::Experimental::Detail::RNTupleMetrics	fMetrics

std::string	fNTupleName

std::unique_ptr< ROOT::Internal::RPageAllocator >	fPageAllocator
	For the time being, we will use the heap allocator for all sources and sinks. This may change in the future.

RTaskScheduler *	fTaskScheduler = nullptr

#include <ROOT/RPageStorageDaos.hxx>

Inheritance diagram for ROOT::Experimental::Internal::RPageSourceDaos:

[legend]

Constructor & Destructor Documentation

◆ RPageSourceDaos()

ROOT::Experimental::Internal::RPageSourceDaos::RPageSourceDaos	(	std::string_view	ntupleName,
		std::string_view	uri,
		const ROOT::RNTupleReadOptions &	options )

Definition at line 487 of file RPageStorageDaos.cxx.

◆ ~RPageSourceDaos()

ROOT::Experimental::Internal::RPageSourceDaos::~RPageSourceDaos ( )

overridedefault

Member Function Documentation

◆ AttachImpl()

ROOT::RNTupleDescriptor ROOT::Experimental::Internal::RPageSourceDaos::AttachImpl ( ROOT::Internal::RNTupleSerializer::EDescriptorDeserializeMode mode )

finalprotectedvirtual

LoadStructureImpl() has been called before AttachImpl() is called

Implements ROOT::Internal::RPageSource.

Definition at line 504 of file RPageStorageDaos.cxx.

◆ CloneImpl()

std::unique_ptr< ROOT::Internal::RPageSource > ROOT::Experimental::Internal::RPageSourceDaos::CloneImpl ( ) const

finalprotectedvirtual

The cloned page source creates a new connection to the pool/container.

Implements ROOT::Internal::RPageSource.

Definition at line 663 of file RPageStorageDaos.cxx.

◆ GetObjectClass()

std::string ROOT::Experimental::Internal::RPageSourceDaos::GetObjectClass ( ) const

Return the object class used for user data OIDs in this ntuple.

Definition at line 539 of file RPageStorageDaos.cxx.

◆ LoadClusters()

std::vector< std::unique_ptr< RCluster > > ROOT::Experimental::Internal::RPageSourceDaos::LoadClusters ( std::span< ROOT::Internal::RCluster::RKey > clusterKeys )

finalvirtual

Populates all the pages of the given cluster ids and columns; it is possible that some columns do not contain any pages.

The page source may load more columns than the minimal necessary set from columns. To indicate which columns have been loaded, LoadClusters()must mark them withSetColumnAvailable(). That includes the ones from thecolumnsthat don't have pages; otherwise subsequent requests for the cluster would assume an incomplete cluster and trigger loading again. LoadClusters()` is typically called from the I/O thread of a cluster pool, i.e. the method runs concurrently to other methods of the page source.

Implements ROOT::Internal::RPageSource.

Definition at line 670 of file RPageStorageDaos.cxx.

◆ LoadPageImpl()

ROOT::Internal::RPageRef ROOT::Experimental::Internal::RPageSourceDaos::LoadPageImpl	(	ColumnHandle_t	columnHandle,
		const RClusterInfo &	clusterInfo,
		ROOT::NTupleSize_t	idxInCluster )

finalprivatevirtual

Implements ROOT::Internal::RPageSource.

Definition at line 592 of file RPageStorageDaos.cxx.

◆ LoadSealedPage()

void ROOT::Experimental::Internal::RPageSourceDaos::LoadSealedPage	(	ROOT::DescriptorId_t	physicalColumnId,
		RNTupleLocalIndex	localIndex,
		RSealedPage &	sealedPage )

finalvirtual

Read the packed and compressed bytes of a page into the memory buffer provided by sealedPage.

The sealed page can be used subsequently in a call to RPageSink::CommitSealedPage. The fSize and fNElements member of the sealedPage parameters are always set. If sealedPage.fBuffer is nullptr, no data will be copied but the returned size information can be used by the caller to allocate a large enough buffer and call LoadSealedPage again.

Implements ROOT::Internal::RPageSource.

Definition at line 544 of file RPageStorageDaos.cxx.

◆ LoadStructureImpl()

void ROOT::Experimental::Internal::RPageSourceDaos::LoadStructureImpl ( )

inlinefinalprotectedvirtual

Implements ROOT::Internal::RPageSource.

Definition at line 171 of file RPageStorageDaos.hxx.

Member Data Documentation

◆ fClusterPool

std::unique_ptr<ROOT::Internal::RClusterPool> ROOT::Experimental::Internal::RPageSourceDaos::fClusterPool

private

The cluster pool asynchronously preloads the next few clusters.

Definition at line 163 of file RPageStorageDaos.hxx.

◆ fCurrentCluster

ROOT::Internal::RCluster* ROOT::Experimental::Internal::RPageSourceDaos::fCurrentCluster = nullptr

private

The last cluster from which a page got loaded. Points into fClusterPool->fPool.

Definition at line 157 of file RPageStorageDaos.hxx.

◆ fDaosContainer

std::unique_ptr<RDaosContainer> ROOT::Experimental::Internal::RPageSourceDaos::fDaosContainer

private

A container that stores object data (header/footer, pages, etc.)

Definition at line 159 of file RPageStorageDaos.hxx.

◆ fDescriptorBuilder

ROOT::Internal::RNTupleDescriptorBuilder ROOT::Experimental::Internal::RPageSourceDaos::fDescriptorBuilder

private

Definition at line 165 of file RPageStorageDaos.hxx.

◆ fNTupleIndex

ntuple_index_t ROOT::Experimental::Internal::RPageSourceDaos::fNTupleIndex {0}

private

Definition at line 154 of file RPageStorageDaos.hxx.

◆ fURI

std::string ROOT::Experimental::Internal::RPageSourceDaos::fURI

private

A URI to a DAOS pool of the form 'daos://pool-label/container-label'.

Definition at line 161 of file RPageStorageDaos.hxx.

tree/ntuple/inc/ROOT/RPageStorageDaos.hxx

tree/ntuple/src/RPageStorageDaos.cxx

Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ RPageSourceDaos()

◆ ~RPageSourceDaos()

Member Function Documentation

◆ AttachImpl()

◆ CloneImpl()

◆ GetObjectClass()

◆ LoadClusters()

◆ LoadPageImpl()

◆ LoadSealedPage()

◆ LoadStructureImpl()

Member Data Documentation

◆ fClusterPool

◆ fCurrentCluster

◆ fDaosContainer

◆ fDescriptorBuilder

◆ fNTupleIndex

◆ fURI