Storage provider that reads ntuple pages from a DAOS container.

Definition at line 193 of file RPageStorageDaos.hxx.

Classes
struct	RClusterInfo
	Summarizes cluster-level information that are necessary to populate a certain page. More...

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

	~RPageSourceDaos () override

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

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

std::vector< std::unique_ptr< RCluster > >	LoadClusters (std::span< 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 (DescriptorId_t physicalColumnId, const RClusterIndex &clusterIndex, RSealedPage &sealedPage) final
	Read the packed and compressed bytes of a page into the memory buffer provided by selaedPage.

RPage	PopulatePage (ColumnHandle_t columnHandle, const RClusterIndex &clusterIndex) final
	Another version of PopulatePage that allows to specify cluster-relative indexes.

RPage	PopulatePage (ColumnHandle_t columnHandle, NTupleSize_t globalIndex) final
	Allocates and fills a page that contains the index-th element.

void	ReleasePage (RPage &page) final
	Every page store needs to be able to free pages it handed out.

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

	RPageSource (RPageSource &&)=delete

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

	~RPageSource () override

ColumnHandle_t	AddColumn (DescriptorId_t fieldId, const RColumn &column) override
	Register a new column.

void	Attach ()
	Open the physical storage container for the tree.

void	DropColumn (ColumnHandle_t columnHandle) override
	Unregisters a column.

ColumnId_t	GetColumnId (ColumnHandle_t columnHandle)

RNTupleMetrics &	GetMetrics () override
	Returns the default metrics object. Subclasses might alternatively override the method and provide their own metrics object.

NTupleSize_t	GetNElements (ColumnHandle_t columnHandle)

NTupleSize_t	GetNEntries ()

const 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.

RPageSource &	operator= (const RPageSource &)=delete

RPageSource &	operator= (RPageSource &&)=delete

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

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

	RPageStorage (RPageStorage &&other)=default

	RPageStorage (std::string_view name)

virtual	~RPageStorage ()

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
RNTupleDescriptor	AttachImpl () final

void	UnzipClusterImpl (RCluster *cluster) final

Protected Member Functions inherited from ROOT::Experimental::Detail::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 RCluster::RKey &clusterKey, ROnDiskPageMap &pageZeroMap, std::function< void(DescriptorId_t, NTupleSize_t, const RClusterDescriptor::RPageRange::RPageInfo &)> perPageFunc)
	Prepare a page range read for the column set in `clusterKey`.

RPage	UnsealPage (const RSealedPage &sealedPage, const RColumnElementBase &element, DescriptorId_t physicalColumnId)
	Helper for unstreaming a page.

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

Private Member Functions
RPage	PopulatePageFromCluster (ColumnHandle_t columnHandle, const RClusterInfo &clusterInfo, ClusterSize_t::ValueType idxInCluster)

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

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

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

RNTupleDescriptorBuilder	fDescriptorBuilder

ntuple_index_t	fNTupleIndex {0}

std::shared_ptr< RPagePool >	fPagePool
	Populated pages might be shared; the page pool might, at some point, be used by multiple page sources.

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::Experimental::Detail::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::Experimental::Detail::RPageSource
static std::unique_ptr< RPageSource >	Create (std::string_view ntupleName, std::string_view location, const RNTupleReadOptions &options=RNTupleReadOptions())
	Guess the concrete derived page source from the file name (location)

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

std::unique_ptr< RCounters >	fCounters

std::unique_ptr< RNTupleDecompressor >	fDecompressor
	Helper to unzip pages and header/footer; comprises a 16MB (kMAXZIPBUF) unzip buffer.

RNTupleMetrics	fMetrics
	Wraps the I/O counters and is observed by the RNTupleReader metrics.

RNTupleReadOptions	fOptions

Protected Attributes inherited from ROOT::Experimental::Detail::RPageStorage
std::string	fNTupleName

RTaskScheduler *	fTaskScheduler = nullptr

#include <ROOT/RPageStorageDaos.hxx>

Inheritance diagram for ROOT::Experimental::Detail::RPageSourceDaos:

[legend]

Constructor & Destructor Documentation

◆ RPageSourceDaos()

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

Definition at line 457 of file RPageStorageDaos.cxx.

◆ ~RPageSourceDaos()

ROOT::Experimental::Detail::RPageSourceDaos::~RPageSourceDaos ( )

overridedefault

Member Function Documentation

◆ AttachImpl()

ROOT::Experimental::RNTupleDescriptor ROOT::Experimental::Detail::RPageSourceDaos::AttachImpl ( )

finalprotectedvirtual

Implements ROOT::Experimental::Detail::RPageSource.

Definition at line 474 of file RPageStorageDaos.cxx.

◆ Clone()

std::unique_ptr< ROOT::Experimental::Detail::RPageSource > ROOT::Experimental::Detail::RPageSourceDaos::Clone ( ) const

finalvirtual

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

The meta-data (header and footer) is reread and parsed by the clone.

Implements ROOT::Experimental::Detail::RPageSource.

Definition at line 676 of file RPageStorageDaos.cxx.

◆ GetObjectClass()

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

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

Definition at line 514 of file RPageStorageDaos.cxx.

◆ LoadClusters()

std::vector< std::unique_ptr< ROOT::Experimental::Detail::RCluster > > ROOT::Experimental::Detail::RPageSourceDaos::LoadClusters ( std::span< 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 with SetColumnAvailable(). That includes the ones from the columns that 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::Experimental::Detail::RPageSource.

Definition at line 683 of file RPageStorageDaos.cxx.

◆ LoadSealedPage()

void ROOT::Experimental::Detail::RPageSourceDaos::LoadSealedPage	(	DescriptorId_t	physicalColumnId,
		const RClusterIndex &	clusterIndex,
		RSealedPage &	sealedPage
	)

finalvirtual

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

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::Experimental::Detail::RPageSource.

Definition at line 519 of file RPageStorageDaos.cxx.

◆ PopulatePage() [1/2]

ROOT::Experimental::Detail::RPage ROOT::Experimental::Detail::RPageSourceDaos::PopulatePage	(	ColumnHandle_t	columnHandle,
		const RClusterIndex &	clusterIndex
	)

finalvirtual

Another version of PopulatePage that allows to specify cluster-relative indexes.

Implements ROOT::Experimental::Detail::RPageSource.

Definition at line 648 of file RPageStorageDaos.cxx.

◆ PopulatePage() [2/2]

ROOT::Experimental::Detail::RPage ROOT::Experimental::Detail::RPageSourceDaos::PopulatePage	(	ColumnHandle_t	columnHandle,
		NTupleSize_t	globalIndex
	)

finalvirtual

Allocates and fills a page that contains the index-th element.

Implements ROOT::Experimental::Detail::RPageSource.

Definition at line 624 of file RPageStorageDaos.cxx.

◆ PopulatePageFromCluster()

ROOT::Experimental::Detail::RPage ROOT::Experimental::Detail::RPageSourceDaos::PopulatePageFromCluster	(	ColumnHandle_t	columnHandle,
		const RClusterInfo &	clusterInfo,
		ClusterSize_t::ValueType	idxInCluster
	)

private

Definition at line 553 of file RPageStorageDaos.cxx.

◆ ReleasePage()

void ROOT::Experimental::Detail::RPageSourceDaos::ReleasePage ( RPage & page )

finalvirtual

Every page store needs to be able to free pages it handed out.

But Sinks and sources have different means of allocating pages.

Implements ROOT::Experimental::Detail::RPageStorage.

Definition at line 671 of file RPageStorageDaos.cxx.

◆ UnzipClusterImpl()

void ROOT::Experimental::Detail::RPageSourceDaos::UnzipClusterImpl ( RCluster * cluster )

finalprotectedvirtual

Reimplemented from ROOT::Experimental::Detail::RPageSource.

Definition at line 781 of file RPageStorageDaos.cxx.

Member Data Documentation

◆ fClusterPool

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

private

The cluster pool asynchronously preloads the next few clusters.

Definition at line 216 of file RPageStorageDaos.hxx.

◆ fCurrentCluster

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

private

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

Definition at line 210 of file RPageStorageDaos.hxx.

◆ fDaosContainer

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

private

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

Definition at line 212 of file RPageStorageDaos.hxx.

◆ fDescriptorBuilder

RNTupleDescriptorBuilder ROOT::Experimental::Detail::RPageSourceDaos::fDescriptorBuilder

private

Definition at line 218 of file RPageStorageDaos.hxx.

◆ fNTupleIndex

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

private

Definition at line 205 of file RPageStorageDaos.hxx.

◆ fPagePool

std::shared_ptr<RPagePool> ROOT::Experimental::Detail::RPageSourceDaos::fPagePool

private

Populated pages might be shared; the page pool might, at some point, be used by multiple page sources.

Definition at line 208 of file RPageStorageDaos.hxx.

◆ fURI

std::string ROOT::Experimental::Detail::RPageSourceDaos::fURI

private

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

Definition at line 214 of file RPageStorageDaos.hxx.

tree/ntuple/v7/inc/ROOT/RPageStorageDaos.hxx

tree/ntuple/v7/src/RPageStorageDaos.cxx

Classes

Public Member Functions

Protected Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Constructor & Destructor Documentation

◆ RPageSourceDaos()

◆ ~RPageSourceDaos()

Member Function Documentation

◆ AttachImpl()

◆ Clone()

◆ GetObjectClass()

◆ LoadClusters()

◆ LoadSealedPage()

◆ PopulatePage() [1/2]

◆ PopulatePage() [2/2]

◆ PopulatePageFromCluster()

◆ ReleasePage()

◆ UnzipClusterImpl()

Member Data Documentation

◆ fClusterPool

◆ fCurrentCluster

◆ fDaosContainer

◆ fDescriptorBuilder

◆ fNTupleIndex

◆ fPagePool

◆ fURI