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Lattice QCD
Data Grid Middleware:
Meta Data Catalog (MDC) and
Simple Replica Catalog (RC)
Demo
M. Sato, for ILDG Middleware WG
ILDG5, Dec, 03, 2004
Grid-of-Grids on MDC


Clients can access multiple MDC’s at different sites
Directory service tells the locations of MDC’s, which may be
managed by LDAP
user
web
browser
WS
server-side
client, or
user app
WS
MDC
Japan
MDC
UK
MDC
US
WS
MDC
directory
service
Interface for MDC (1)

Query to ensemble query service (in Java)
 returns a set of GFNs in EnsembleQueryResults
EnsembleQueryResults
doEnsembleQuery(String queryFormat, /* ALL, Xpath, SQL, …*/
String queryString, /* string for query */
int startIndex, /* the start index to be returned */
int maxResults); /* maximum # to be returned */
class EnsembleQueryResults
String Status;
String queryFormat; /*
String queryString; /*
int totalRresults;
/*
int startIndex;
/*
int numberOfGFNs;
/*
String GFNs[];
/*
String QueryTime;
/*
}
{
same as input */
same as input */
total number of matched ensemble */
same as input */
# of GFNs returned */
the array of GFNs matched */
query time (optional) */
•If queryFormt == “ALL”, retrieve all data.
•SQL-style query may be useful and efficient
Interface for MDC (2)

Query to metadata query service
 returns a set of metadata GFNs
 Almost the same to doEnsambleQuery.
MetadataQueryResults
doMetadataQuery(String queryFormat, /* ALL, Xpath, SQL, …*/
String queryString, /* string for query */
int startIndex, /* the start index to be returned */
int maxResults); /* maximum # to be returned */
class MetadataQueryResults
String Status;
String queryFormat; /*
String queryString; /*
int totalRresults;
/*
int startIndex;
/*
int numberOfGFNs;
/*
String GFNs[];
/*
String QueryTime;
/*
}
{
same as input */
same as input */
total number of matched metadata */
same as input */
# of GFNs returned */
the array of GFNs matched */
query time (optional) */
A Use Case
doEnsembleQuery
get the ensemble file
using GFN by RC and TRUL
query (MDC)
EnsembleQueryResults
GFN (RC)
TURL for ensemble XML
and the file itself
doMetadataQuery
get the metadata file
using GFN by RC and TURL
get the configuration
file using GFN and TURL
ensemble query
service(MDC)
RC
ensemble data
query (MDC)
metadata query
MetadataQueryResults
service
GFN (RC)
TRUL for metadata XML
and the file itself
GFN
configuration
(binary?)
RC
metadata
RC
configuration
data
Demo
 Design
of MDC interface in WSDL
 Using Axis (an apache project) to generate
interface
 A prototype implementation of WS by Axis
 Demo
info page
http://www.lqa.ccs.tsukuba.ac.jp/WS
Plan





Documentation of the definitions of MDC interface (for
single MDC)
Finish the implementation and some command
interface
Multiple MDCs
Directory service of MDCs (project info?)
Web browser interface for Multiple MDCs

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