HTTP Storage Requirements

This page tracks the required and desired functionality requested from HTTP storage, as defined by the HTTP Deployment Task Force.

We can classify these requirements in different ways, to discuss at the next meeting, but one possibility is

  • A: required for the deployment of HTTP to be worth pursing at all
  • B: required for SRM-free operation of disk storage
  • C: required for single-protocol (ie HTTP-only) disk storage
  • D: desirable feature
  • E: irrelevant

Functionality Atlas LHCb dCache DPMSorted ascending EOS StorRM xrootd Comments
3rd Party Copy ↔ gridFTP D D Y ?   N N  
Set checksum / type C, e.g., md5   N N set XS: support for custom header to preset checksum on PUT for OC - set type:Y N (if this means setting the checksum after the transfer) Y internal  
3rd Party Copy Destination C D N N N N Y  
ACL Management D D N N Y (custom rest API) N N  
Directory Space Reporting C C N N (planned) custom Rest API using subtree accounting N (planned) Y via virtual partitions To what hierarchical depth is this required?
Create, Read, Update, Delete A A Y Y Y (GET HEAD PUT DELETE OPTIONS) Y Y (AP: what is HTTP update?)
WebDAV (which bits?) PROPFIND, MOVE Partially Partially Y Partially: MKCOL PROPFIND PROPPATCH COPY MOVE LOCK UNLOCK - some special header support PROPFIND, CP, MV Y (AP: complex to answer, impossible to put Y here)
X509/VOMS AA A A Y Y RFC Proxies at VO granularity per storage area Y  
Multi-range requests D   Y Y Y Y Y  
Get checksum C C Y Y Y (PROPFIND, custom Rest API) Y Y internal
3rd Party Copy Source C D Y Y N N Y  
Monitoring of HTTP traffic C (network monitoring, popularity ?) D N(planned) Y Y (internal, not via xrootd) N Y This refers to i/o monitoring (like xrootd fstream or similar)
Endpoint publication to BDII C C Y Y N Y Y  
Calculate checksum / type C, e.g., md5   N Y (md5, adler32) implicit (md5,adler32,crc32c,crc32,sha1) Y (adler32) Y internal  
3rd Party Copy ↔ S3 D D N Y, prototype ? N N  


This topic: LCG > WebHome > WLCGCommonComputingReadinessChallenges > WLCGOperationsWeb > WLCGOpsCoordination > HTTPDeployment > HTTPStorageRequirements
Topic revision: r14 - 2015-06-03 - OliverKeeble
 
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