Off-line weekly meeting Progress with the DB access classes Summary: Changes/upgrades of the classes hunts for memory leaks correction of a few bugs first experience with Grid services Weekly meeting Alberto Colla Alberto Colla Off-line weekly meeting Cern, June 30, 2005

Off-line weekly meeting Reference documents Draft note on the condition DB access, distributed to the Off-line mailing list Talks by M. Gruwe and A. Colla at the last Alice off-line week (May 31th) Alberto Colla Off-line weekly meeting

Off-line weekly meeting DB access classes schema AliRunData DB object AliObjectMetaData AliRunDataStorage AliRunDataFile AliRunDataOganizedFile AliRunDataAlien Local file Local file in a defined folder structure AliEn file AliRunLoader (AliSelectionMetaData) User code GetRunObject Get/Put GetEntry/PutEntry Note: classes names are under discussion and are subject to change! Alberto Colla Off-line weekly meeting

Off-line weekly meeting Review of the DB access classes Following the many feedbacks received after the distribution of the note, we have reviewed the DB access classes Changes have applied on: the names of the DB classes their behaviour Alberto Colla Off-line weekly meeting

Off-line weekly meeting Renaming of the DB access classes First of all, we were asked to change the AliRunData prefix into AliCDB. Therefore: AliRunData  AliCDBEntry AliRunDataStorage  AliCDBStorage AliRunDataFile  AliCDBDump AliRunDataOrganizedFile  AliCDBLocal AliRunDataAlien  AliCDBGrid Alberto Colla Off-line weekly meeting

Off-line weekly meeting DB access classes schema (New) AliCDBEntry DB object AliObjectMetaData AliCDBStorage AliCDBDump AliCDBLocal AliCDBGrid Dump file Local file in a defined folder structure AliEn file AliRunLoader (AliSelectionMetaData) User code GetRunObject Get/Put GetEntry/PutEntry Alberto Colla Off-line weekly meeting

Off-line weekly meeting Changes in the classes’ behaviour In case of presence of more than 1 object valid for a given run and with the same version, f.e.: /DBFolder/ObjName/Run1-10_v0.root /DBFolder/ObjName/Run1-15_v0.root (Note: this can only happen if the file name is changed by hand!)  Before: warning message, the first object found was returned  Now: error message, no objects returned! In case the specified version of the object to be retrieved does not exist  Before: warning message, the closest preceding version was returned  Now: error message, no objects returned! Alberto Colla Off-line weekly meeting

Off-line weekly meeting Changes in the classes’ behaviour (2) During the storage of an object with the AliCDBLocal class the run validity and version of the object’s metadata is not reset (as it was before). If the file name is changed by hand so that the run validity and/or version do not match those in the object’s metadata a warning message is issued during retrieval. Alberto Colla Off-line weekly meeting

Off-line weekly meeting Hunt for memory leaks With the help of Paul Nilsson and of his SPD calibration objects I have checked the code against possible memory leaks during storage and retrieval of a large number of objects memory leaks in the DB access classes’ code were found and corrected a few bugs in the code were found in parallel and corrected After the corrections we have re-checked the code by storing and getting back thousands of SPD calibration objects, with no appreciable memory leaks Note: a SPD calibration object is a “AliITSBadChannelsSPD” container which contains a (TObj)Array of TObjArrays (one for each SPD module), in which the coordinates of the noisy channels of every SPD module are stored. Alberto Colla Off-line weekly meeting

Off-line weekly meeting Next release of the DB access classes Upgraded DB access classes have been sent to Peter in order to be included in the next release of AliRoot Alberto Colla Off-line weekly meeting

Off-line weekly meeting First experience with Grid services Reference documents: Talks by L. Betev and A. Peters at the last Alice off-line meeting (June 01st and 02nd) Alberto Colla Off-line weekly meeting

Off-line weekly meeting Installation of gShell and AliEn client CERN desktop (AFS): no need to install AliEn client, install gShell V1.0.3 After installation: laptop (no AFS): installation of AliEn client  I tried it, but I could not connect due to problems with my certificate transferral. Will check together with Latchezar… Alberto Colla Off-line weekly meeting

Off-line weekly meeting Installation of Root 5.0 + AliEn support AliEn support configuration requires loading of gShell environment, so that $GSHELL_ROOT is defined # cd $ROOTSYS # ./configure –enable-alien --with-alien-incdir=$GSHELL_ROOT/include --with-alien-libdir=$GSHELL_ROOT/lib/ # make Alberto Colla Off-line weekly meeting

Off-line weekly meeting Connecting to Grid from Root Alberto Colla Off-line weekly meeting

“alien://aliendb4.cern.ch:9000”, “colla” Connecting to Grid from Root (2) url user “alien://aliendb4.cern.ch:9000”, “colla” grid host port When TGrid::Connect is called: the library $ROOTSYS/lib/libRAliEn.so is loaded via TPluginManager class The constructor of TAlien class is invoked Inside TAlien constructor the “new” class $GSHELL_ROOT/include/gliteUI.h is instantiated ($GSHELL_ROOT must be defined!) GLiteUI::Connect(fHost, fPort, fUser) is called Alberto Colla Off-line weekly meeting

Off-line weekly meeting Copying files to Grid to copy a local file to Grid (and vice versa): # cp file:<localPath>/filename filename@ALICE::CERN::Server Grid storage elements at Cern: ALICE::CERN::Server ALICE::CERN::se01 ALICE::CERN::Castor ALICE::CERN::SOFTWARE list of files from Grid: ls file: or ls alien: will redirect to local or Grid paths respectively.  Unfortunately things stop working last week, after a new development of the interface (A. Peters told me). Experts are working... Alberto Colla Off-line weekly meeting

Off-line weekly meeting Next steps As soon as AliEn services are fully operational again: Begin implementation of the DB access classes to Grid (AliCDBGrid) Begin the implementation of the access classes “manager” (in order to handle the storage and retrieval from different sources)  A summer student, Boyko Yordanov, just joined the group and will work on the access classes interface. Thanks and welcome! Alberto Colla Off-line weekly meeting