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XROOTD-L  May 2021

XROOTD-L May 2021

Subject:

http ingest using xcache fails

From:

Bertrand RIGAUD <[log in to unmask]>

Reply-To:

Support use of xrootd by HEP experiments <[log in to unmask]>

Date:

Thu, 6 May 2021 12:23:07 +0200

Content-Type:

multipart/signed

Parts/Attachments:

Parts/Attachments

text/plain (191 lines) , smime.p7s (191 lines)

Hi,

Trying to deploy this architecture (https://cvmfs.readthedocs.io/en/stable/_images/xcache2.svg), I'm facing a problem when downloading a file through http.

Everythting works well till the last chunk is downloaded.

As an example, here is a simple curl performed from the client machine (and this is the same behaviour with cvmfs client) :

### Through xcache server ###

$ curl -v -o file1  http://my_xcache_server:1094//http://path/to/my/file
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* About to connect() to my_xcache_server port 1094 (#0)
*   Trying xxx.xxx.xxx.xxx...
* Connected to my_xcache_server (xxx.xxx.xxx.xxx) port 1094 (#0)
> GET //http://path/to/my/file HTTP/1.1
> User-Agent: curl/7.29.0
> Host: my_xcache_server:1094
> Accept: */*
> 
< HTTP/1.1 200 OK
< Connection: Keep-Alive
< Content-Length: 506173152
< 
{ [data not shown]
 99  482M   99  480M    0     0  57.9M      0  0:00:08  0:00:08 --:--:-- 29.9M* transfer closed with 2856672 bytes remaining to read
 99  482M   99  480M    0     0  57.7M      0  0:00:08  0:00:08 --:--:-- 11.5M
* Closing connection 0
curl: (18) transfer closed with 2856672 bytes remaining to read


### Direct download ###

curl -v -o file2 http://path/to/my/file
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* About to connect() to source_server port 8000 (#0)
*   Trying 145.146.100.30...
* Connected to source_server (xxx.xxx.xxx.xxx) port 8000 (#0)
> GET path/to/my/file HTTP/1.1
> User-Agent: curl/7.29.0
> Host: source_server:8000
> Accept: */*
> 
< HTTP/1.1 200 OK
< Connection: Keep-Alive
< Content-Length: 506173152
< 
{ [data not shown]
100  482M  100  482M    0     0   101M      0  0:00:04  0:00:04 --:--:--  101M
* Connection #0 to host source_server left intact

### Xcache server logs (last chunk) ###

210506 08:53:05 155627 sysXrdHttp:  XrdHttpReq::Data! final=1
210506 08:53:05 155627 unknown.2:23@clientmachine sysXrdHttp: PostProcessHTTPReq req: 2 reqstate: 481
210506 08:53:05 155627 unknown.2:23@clientmachine sysXrdHttp: Got data vectors to send:1
210506 08:53:05 155627 sysXrdHttp: Sending 1048576 bytes
210506 08:53:05 155627 unknown.2:23@clientmachine sysXrdHttp:  Process. lp:0 reqstate: 481
210506 08:53:05 155627 unknown.2:23@clientmachine sysXrdHttp: Process is exiting rc:0
210506 08:53:05 155627 XrdPfc_IO: dump Read() 0x7fc1d00019f0 off: 503316480 size: 1048576 [log in to unmask]:8000/http/source.server:8000/path/to/file" target="_blank">http:[log in to unmask]:8000/http/source.server:8000/path/to/file?
210506 08:53:05 155627 XrdPfc_File: dump Read() idx 120 http/source.server:8000/path/to/file
210506 08:53:05 155627 XrdPfc_File: dump inc_ref_count 0x7fc1a0403530 refcnt  1 http/source.server:8000/path/to/file
210506 08:53:05 155627 XrdPfc_File: dump Read() 0x7fc1f0028000inc_ref_count for existing block 0x7fc1a0403530 idx = 120 http/source.server:8000/path/to/file
XcacheH: stagein list snapshot: available workers: 10, list length: 0
[2021-05-06 08:53:09.092614 +0200][Error  ][XrdClHttp         ] Could not read URL: [log in to unmask]:8000//path/to/file?" target="_blank">http:[log in to unmask]:8000//path/to/file?, error: [ERROR] Internal error: no such device or address: Result Invalid Read in request after 3 attempts
210506 08:53:09 155645 XrdPfc_File: dump Prefetch enter to check download status http/source.server:8000/path/to/file
210506 08:53:09 155645 XrdPfc_File: debug Prefetch file is complete, stopping prefetch. http/source.server:8000/path/to/file
210506 08:53:09 155626 XrdPfc_File: dump ProcessBlockResponse block=0x7fc1a0403530, idx=120, off=503316480, res=-6 http/source.server:8000/path/to/file
210506 08:53:09 155626 XrdPfc_File: debug ProcessBlockResponse after failed prefetch on io 0x7fc1d00019f0 disabling prefetching on this io. http/source.server:8000/path/to/file
210506 08:53:09 155626 XrdPfc_File: error ProcessBlockResponse block 0x7fc1a0403530, idx=120, off=503316480 error=-6 http/source.server:8000/path/to/file
210506 08:53:09 155627 XrdPfc_File: dump Read() requested block finished 0x7fc1a0403530, is_failed()=True http/source.server:8000/path/to/file
210506 08:53:09 155627 XrdPfc_File: error Read() io 0x7fc1d00019f0, block 120 finished with error 6 no such device or address http/source.server:8000/path/to/file
210506 08:53:09 155627 XrdPfc_File: dump Read() dec_ref_count 0x7fc1a0403530 idx = 120 http/source.server:8000/path/to/file
210506 08:53:09 155627 XrdPfc_File: dump free_block block 0x7fc1a0403530  idx =  120 http/source.server:8000/path/to/file
210506 08:53:09 155627 XrdPfc_IO: warning Read() error in File::Read(), exit status=-6, error=no such device or address [log in to unmask]:8000/http/source.server:8000/path/to/file" target="_blank">http:[log in to unmask]:8000/http/source.server:8000/path/to/file?
210506 08:53:09 155627 ofs_read: unknown.2:23@clientmachine Unable to read /http:/source.server:8000/path/to/file; no such device or address
210506 08:53:09 155627 sysXrdHttp:  XrdHttpReq::Error
210506 08:53:09 155627 unknown.2:23@clientmachine sysXrdHttp: PostProcessHTTPReq req: 2 reqstate: 482
210506 08:53:09 155627 unknown.2:23@clientmachine sysXrdHttp: PostProcessHTTPReq mapping Xrd error [3005] to status code [500]
210506 08:53:09 155627 unknown.2:23@clientmachine sysXrdHttp: Stopping request because more data is expected but no data has been read.
210506 08:53:09 155627 sysXrdHttp:  XrdHttpReq request ended.
210506 08:53:09 155627 sysXrdHttp:  Cleanup
210506 08:53:09 155627 sysXrdHttp:  Reset
210506 08:53:09 155627 sysXrdHttp:  XrdHttpReq request ended.
210506 08:53:09 155627 XrootdXeq: unknown.2:23@clientmachine disc 0:00:09 (send failure)
210506 08:53:09 155627 XrdPfc_File: debug ioActive start for io 0x7fc1d00019f0 http/path/to/file
210506 08:53:09 155627 XrdPfc_File: info ioActive for io 0x7fc1d00019f0, active_prefetches 0, allow_prefetching False, ioactive_false_reported False, ios_in_detach 0
210506 08:53:09 155627 XrdPfc_File: info 	io_map.size() 1, block_map.size() 0, file http/path/to/file
210506 08:53:09 155627 XrdPfc_File: info ioActive for io 0x7fc1d00019f0 returning False, file http/path/to/file
210506 08:53:09 155627 XrdPfc_IO: info DetachFinalize() 0x7fc1d00019f0
210506 08:53:09 155627 XrdPfc_Cache: debug ReleaseFile http/path/to/file, io 0x7fc1d00019f0
210506 08:53:09 155627 XrdPfc_File: debug RemoveIO() io = 0x7fc1d00019f0 http/path/to/file
210506 08:53:09 155627 XrdPfc_Cache: debug dec_ref_cnt http/path/to/file, cnt at entry = 1
210506 08:53:09 155627 XrdPfc_File: debug FinalizeSyncBeforeExit requesting sync to write detach stats http/path/to/file
210506 08:53:09 155627 XrdPfc_Cache: debug dec_ref_cnt http/path/to/file, scheduling final sync
210506 08:53:09 155627 XrdPfc_IO: debug ~IOEntireFile() 0x7fc1d00019f0 [log in to unmask]:8000/http/path/to/file" target="_blank">http:[log in to unmask]:8000/http/path/to/file?
210506 08:53:09 155627 Posix_PrepIODisable: Disabling defered open [log in to unmask]:8000//path/to/file" target="_blank">http:[log in to unmask]:8000//path/to/file?
210506 08:53:09 160872 XrdPfc_File: dump Sync() http/path/to/file
210506 08:53:09 160872 XrdPfc_File: dump Sync 0 blocks written during sync http/path/to/file
210506 08:53:09 160872 XrdPfc_Cache: debug dec_ref_cnt http/path/to/file, cnt at entry = 1
210506 08:53:09 160872 XrdPfc_File: debug FinalizeSyncBeforeExit sync not required http/path/to/file
210506 08:53:09 160872 XrdPfc_Cache: debug dec_ref_cnt http/path/to/file, cnt after sync_check and dec_ref_cnt = 0
210506 08:53:09 160872 XrdPfc_File: debug ~File() close info  http/path/to/file
210506 08:53:09 160872 XrdPfc_File: debug ~File() close output   http/path/to/file
210506 08:53:09 160872 XrdPfc_File: debug ~File() ended, prefetch score = 3.95238 http/path/to/file
210506 08:53:11 155631 Posix_DDestroy: DLY destory of 1 objects; 0 already lost.
210506 08:53:11 155631 Posix_DDestroy: DLY destory end; 0 objects deferred and 0 lost.

### Xcache config ###

all.role     proxy server

all.export /http:/
all.export /https:/

ofs.osslib      libXrdPss.so

xrootd.seclib /usr/lib64/libXrdSec.so

pss.origin =http,https

# US data servers
pss.permit      source.server
pss.permit      source.server
pss.permit      source.server
pss.permit      source.server
pss.permit      source.server
pss.permit      source.server
pss.permit      source.server
# EU data servers
pss.permit      source.server
pss.permit      source.server
pss.permit      source.server

pss.cachelib    libXrdPfc.so
pss.config streams 8

# XcacheH
pss.namelib -lfncachesrc+ /usr/lib64/XrdName2NameXcacheH.so cacheLife=1d cacheBlockSize=4m
pss.ccmlib /usr/lib64/XrdName2NameXcacheH.so

oss.localroot   /xcache/ns

# Metadata directories (cinfo files)
oss.space meta /xcache/meta

# Data directories
oss.space data /xcache/data

# Xcache spaces assignement
pfc.spaces data meta

if exec xrootd
  xrd.protocol http:1094 libXrdHttp.so
fi

pfc.diskusage 0.90 0.95

pfc.ram 6g
pfc.blocksize 4M
pfc.prefetch 32

pfc.trace dump
http.trace   all
pss.trace  all
pss.debug

### xrootd version: 5.1.1 ###

As a result, I got an almost file downloaded on client side, and also in xcache server, cached data is an almost file. Just this last chunk missing.

Are there directives missing in congig file?

Thank you,

Bertrand Rigaud

Centre de Calcul de l'IN2P3 - CNRS
21 avenue Pierre de Coubertin
69627 Villeurbanne CEDEX
Tél : 04.78.93.08.80

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