December 1, 2005HDF & HDF-EOS Workshop IX P eter Cao, NCSA December 1, 2005 Sponsored by NLADR, NFS PACI Project in Support of NCSA-SDSC Collaboration.

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Presentation transcript:

December 1, 2005HDF & HDF-EOS Workshop IX P eter Cao, NCSA December 1, 2005 Sponsored by NLADR, NFS PACI Project in Support of NCSA-SDSC Collaboration Object-level Access to Remote Files Integrating HDF5 with SRB

December 1, 2005HDF & HDF-EOS Workshop IX2/22 Outline Introduction to the HDF-SRB project The HDF-SRB model SRB Support in HDFView

December 1, 2005HDF & HDF-EOS Workshop IX3/22 Overview of SRB What is SRB The SDSC Storage Resource Broker (SRB) is client-server middleware that provides a uniform interface for connecting to distributed data storage in multiple types of storage resources.

December 1, 2005HDF & HDF-EOS Workshop IX4/22 Overview of SRB Architecture SRB Client SRB Server MCAT DB2FTPHDF5ObjStore HPSSUnitree Distributed Storage Resources: database system, archival storage system, file system, ftp

December 1, 2005HDF & HDF-EOS Workshop IX5/22 Project Description Motivation SRBHDF5 Indexing and searching Distributed data system Access control Large and diverse data High performance access Interactive and subsetting High performance distributed data system

December 1, 2005HDF & HDF-EOS Workshop IX6/22 Remote Data Access on SRB Methods Normal ways to access SRB:  Get the whole file: large files (100TB SCEC)  Use POSIX low level calls: low performance New way:  Implement proxy operations to access objects or parts of objects in one request

December 1, 2005HDF & HDF-EOS Workshop IX7/22 Project Description Goals Working prototype of client/server system for object-level access to HDF5 stored in the SRB Use SRB as middleware to transfer data between the server and client Use Object-level access for interactive and efficient access to part of the file

December 1, 2005HDF & HDF-EOS Workshop IX8/22 Normal SRB File Access Architecture SRB Server HDF5 MCAT HDF5 File (whole file or a sequence of bytes) client

December 1, 2005HDF & HDF-EOS Workshop IX9/22 Object-level File Access Architecture SRB Server HDF5 MCAT HDF5 Library HDF5-SRB Module (pack/unpack messages) HDF5 Object (File, Group, Dataset, Subset, Attribute) HDF5 Object (File, Group, Dataset, Subset, Attribute) HDF5-SRB Module (pack/unpack messages) clientserver

December 1, 2005HDF & HDF-EOS Workshop IX10/22 Examples of File Access HDF5 I need to see the eye of Hurricane Bob!

December 1, 2005HDF & HDF-EOS Workshop IX11/22 Examples of File Access Whole file transferHDF5 Get the file

December 1, 2005HDF & HDF-EOS Workshop IX12/22 Examples of File Access Whole file transferHDF5 Transfer large image – slow! HDF5HDF5 HDF5

December 1, 2005HDF & HDF-EOS Workshop IX13/22 Examples of File Access SRB POSIX APIHDF5 I need to see the eye of Hurricane Bob!

December 1, 2005HDF & HDF-EOS Workshop IX14/22 Examples of File Access SRB POSIX APIHDF5 Many small messages – slow and complex! image found image open open image find image file’s open Open file

December 1, 2005HDF & HDF-EOS Workshop IX15/22 Examples of File Access Object levelHDF5 Get me the eye of hurricane Bob

December 1, 2005HDF & HDF-EOS Workshop IX16/22 Examples of File Access Object levelHDF5 One request & small image – fast & simple! Get me the eye of hurricane Bob

December 1, 2005HDF & HDF-EOS Workshop IX17/22 HDF5-SRB Model New objects/APIs A new set data objects  H5File, H5Group, H5Dataset, H5Datatype, etc  Encapsulated client requests and server results Enhanced SRB APIs  Pack/Unpack routines (exchange data between byte stream and structure) to handle complicated struct – string, pointers, pointers to arrays, arrays of pointers, etc  New srbGenProxyFunct (general Proxy Function) handles other types of request besides HDF5

December 1, 2005HDF & HDF-EOS Workshop IX18/22 HDF5-SRB Model Data Flow Client API srbObjRequest(void *obj, int objID) Server API srbObjProcess(void *obj, int objID) srbGenProxyFunct 1. packMsg() 2. unpackMsg() HDF5 Library HDF5 file 3. H5Obj::op() 4. Access file 5. H5Object 6. packMsg() 7. unpackMsg() SRB Server

December 1, 2005HDF & HDF-EOS Workshop IX19/22 Runing Server/Client A SRB server that supports HDF5  HDF5 library and other external libraries (SZIP, ZLIB)  A SRB version 3.4 or later from  Follow instruction on how to run SRB server from UG packed with SRB source release or online at Any client application that implements HDF5-SRB Objects  No HDF5 library is required on the client  Example client application: HDFView 2.3 or above

December 1, 2005HDF & HDF-EOS Workshop IX20/22 Short Demo HDFView Support Windows and Linux May support SGI, AIX if there is new funding

December 1, 2005HDF & HDF-EOS Workshop IX21/22 Future Work? Writing capabilities: the current HDF-SRB implementation only supports read-only operations. We propose to add write functionality so that users will be able to create new files and data objects, and to modify data content and attributes. Better support for complex datatypes such as compound datatype and variable length datatype Support for HDF5 indexing and ingesting HDF5 metadata, which will enable users to access HDF5 objects directly through MCAT Support for files across different servers (or SRB federation) More features for HDFView: compared to its local file-handling capabilities, the current version of HDFView has very limited features for remote file access on an SRB server.

December 1, 2005HDF & HDF-EOS Workshop IX22/22 Question / Comments?