Clusters are bundled in cluster groups.
Very large ntuples or combined ntuples (chains, friends) contain multiple cluster groups. The cluster groups may contain sharded clusters. Every ntuple has at least one cluster group. The clusters in a cluster group are ordered corresponding to the order of page locations in the page list envelope that belongs to the cluster group (see format specification)
Definition at line 432 of file RNTupleDescriptor.hxx.
Public Member Functions | |
RClusterGroupDescriptor ()=default | |
RClusterGroupDescriptor (const RClusterGroupDescriptor &other)=delete | |
RClusterGroupDescriptor (RClusterGroupDescriptor &&other)=default | |
RClusterGroupDescriptor | Clone () const |
RClusterGroupDescriptor | CloneSummary () const |
const std::vector< ROOT::DescriptorId_t > & | GetClusterIds () const |
std::uint64_t | GetEntrySpan () const |
ROOT::DescriptorId_t | GetId () const |
std::uint64_t | GetMinEntry () const |
std::uint32_t | GetNClusters () const |
std::uint64_t | GetPageListLength () const |
RNTupleLocator | GetPageListLocator () const |
bool | HasClusterDetails () const |
A cluster group is loaded in two stages. | |
RClusterGroupDescriptor & | operator= (const RClusterGroupDescriptor &other)=delete |
RClusterGroupDescriptor & | operator= (RClusterGroupDescriptor &&other)=default |
bool | operator== (const RClusterGroupDescriptor &other) const |
Private Attributes | |
ROOT::DescriptorId_t | fClusterGroupId = ROOT::kInvalidDescriptorId |
std::vector< ROOT::DescriptorId_t > | fClusterIds |
The cluster IDs can be empty if the corresponding page list is not loaded. | |
std::uint64_t | fEntrySpan = 0 |
Number of entries that are (partially for sharded clusters) covered by this cluster group. | |
std::uint64_t | fMinEntry = 0 |
The minimum first entry number of the clusters in the cluster group. | |
std::uint32_t | fNClusters = 0 |
Number of clusters is always known even if the cluster IDs are not (yet) populated. | |
std::uint64_t | fPageListLength = 0 |
Uncompressed size of the page list. | |
RNTupleLocator | fPageListLocator |
The page list that corresponds to the cluster group. | |
Friends | |
class | Internal::RClusterGroupDescriptorBuilder |
#include <ROOT/RNTupleDescriptor.hxx>
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ROOT::Experimental::RClusterGroupDescriptor ROOT::Experimental::RClusterGroupDescriptor::Clone | ( | ) | const |
Definition at line 726 of file RNTupleDescriptor.cxx.
ROOT::Experimental::RClusterGroupDescriptor ROOT::Experimental::RClusterGroupDescriptor::CloneSummary | ( | ) | const |
Definition at line 714 of file RNTupleDescriptor.cxx.
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Definition at line 468 of file RNTupleDescriptor.hxx.
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Definition at line 470 of file RNTupleDescriptor.hxx.
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Definition at line 464 of file RNTupleDescriptor.hxx.
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Definition at line 469 of file RNTupleDescriptor.hxx.
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Definition at line 465 of file RNTupleDescriptor.hxx.
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Definition at line 467 of file RNTupleDescriptor.hxx.
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Definition at line 466 of file RNTupleDescriptor.hxx.
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A cluster group is loaded in two stages.
Stage one loads only the summary information. Stage two loads the list of cluster IDs.
Definition at line 473 of file RNTupleDescriptor.hxx.
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bool ROOT::Experimental::RClusterGroupDescriptor::operator== | ( | const RClusterGroupDescriptor & | other | ) | const |
Definition at line 708 of file RNTupleDescriptor.cxx.
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Definition at line 433 of file RNTupleDescriptor.hxx.
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Definition at line 436 of file RNTupleDescriptor.hxx.
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The cluster IDs can be empty if the corresponding page list is not loaded.
Otherwise, cluster ids are sorted by first entry number.
Definition at line 439 of file RNTupleDescriptor.hxx.
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Number of entries that are (partially for sharded clusters) covered by this cluster group.
Definition at line 447 of file RNTupleDescriptor.hxx.
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The minimum first entry number of the clusters in the cluster group.
Definition at line 445 of file RNTupleDescriptor.hxx.
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Number of clusters is always known even if the cluster IDs are not (yet) populated.
Definition at line 449 of file RNTupleDescriptor.hxx.
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Uncompressed size of the page list.
Definition at line 443 of file RNTupleDescriptor.hxx.
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The page list that corresponds to the cluster group.
Definition at line 441 of file RNTupleDescriptor.hxx.