edm::DuplicateTreeSentry Class Reference

Classes
struct	CloseBeforeDelete

Public Member Functions
	DuplicateTreeSentry (TTree *tree)
	DuplicateTreeSentry (DuplicateTreeSentry const &)=delete
DuplicateTreeSentry &	operator= (DuplicateTreeSentry const &)=delete
TTree *	tree () const

Private Member Functions
void	dup ()

Private Attributes
std::unique_ptr< TFile, CloseBeforeDelete >	file_
std::unique_ptr< TTree >	mytree_ = nullptr
TTree *	tree_ = nullptr

Detailed Description

Currently, ROOT doesn't use any latency-hiding optimizations for fast-cloning. This causes a significant slowdown when doing fast-cloning over a high-latency network (30ms latency makes this multiple factors slower).

Accordingly, we allow sites to provide a separate hint on how to treat fast- cloning. The DuplicateTreeSentry allows us to implement it - given a tree we are about to clone, with the appropriate configs, this will re-open the file with lazy-download and re-open the tree. The new tree is appropriate for cloning. When the object is destroyed, the new file and tree are cleaned up.

Definition at line 41 of file RootOutputTree.cc.

Constructor & Destructor Documentation

edm::DuplicateTreeSentry::DuplicateTreeSentry ( TTree *  tree )

inline

Definition at line 43 of file RootOutputTree.cc.

References dup().

: tree_(tree) { dup(); }

edm::DuplicateTreeSentry::DuplicateTreeSentry ( DuplicateTreeSentry const &  )

delete

Member Function Documentation

void edm::DuplicateTreeSentry::dup ( )

inlineprivate

Definition at line 59 of file RootOutputTree.cc.

References mergeVDriftHistosByStation::file, file_, edm::Service< T >::isAvailable(), mytree_, edm::SiteLocalConfig::sourceCacheHint(), edm::SiteLocalConfig::sourceCloneCacheHint(), tree_, and relmon_authenticated_wget::url.

Referenced by DuplicateTreeSentry().

               {
      edm::Service<edm::SiteLocalConfig> pSLC;
      if (!pSLC.isAvailable()) {
        return;
      }
      if (pSLC->sourceCacheHint() && *(pSLC->sourceCacheHint()) == "lazy-download") {
        return;
      }
      if (!pSLC->sourceCloneCacheHint() || *(pSLC->sourceCloneCacheHint()) != "lazy-download") {
        return;
      }
      edm::LogWarning("DuplicateTreeSentry") << "Re-opening file for fast-cloning";

      TFile* file = tree_->GetCurrentFile();
      const TUrl* url = file->GetEndpointUrl();
      if (!url) {
        return;
      }
      file_.reset(TFile::Open(url->GetUrl(), "READWRAP"));  // May throw an exception.
      if (!file_) {
        return;
      }
      mytree_.reset(dynamic_cast<TTree*>(file_->Get(tree_->GetName())));
      if (!mytree_) {
        return;
      }
    }

DuplicateTreeSentry& edm::DuplicateTreeSentry::operator= ( DuplicateTreeSentry const &  )

delete

TTree* edm::DuplicateTreeSentry::tree ( ) const

inline

Definition at line 47 of file RootOutputTree.cc.

References mytree_, and tree_.

Referenced by ZJetsTreeAnalyzer.ZJetsTreeAnalyzer::beginLoop(), MetTreeProducer.MetTreeProducer::declareVariables(), core.AutoFillTreeProducer.AutoFillTreeProducer::declareVariables(), edm::RootOutputTree::fastCloneTTree(), core.AutoFillTreeProducer.AutoFillTreeProducer::fillTree(), ZJetsTreeAnalyzer.ZJetsTreeAnalyzer::process(), MetTreeProducer.MetTreeProducer::process(), and python.cmstools.EventTree::SetAlias().

{ return mytree_ ? mytree_.get() : tree_; }

Member Data Documentation

std::unique_ptr<TFile, CloseBeforeDelete> edm::DuplicateTreeSentry::file_

private

Note this relies on the implicit delete ordering - mytree_ (if non-null) must be deleted before file_. Do not reorder the class members!

Definition at line 91 of file RootOutputTree.cc.

Referenced by dup().

std::unique_ptr<TTree> edm::DuplicateTreeSentry::mytree_ = nullptr

private

Definition at line 93 of file RootOutputTree.cc.

Referenced by dup(), and tree().

TTree* edm::DuplicateTreeSentry::tree_ = nullptr

private

Definition at line 92 of file RootOutputTree.cc.

Referenced by dup(), and tree().