PEGASUS−TRANSFER

NAME

pegasus-transfer − Handles data transfers in Pegasus workflows.

SYNOPSIS

pegasus−transfer [−h]
[−−file inputfile]
[−−threads number_threads]
[−−max−attempts attempts]
[−−debug]

DESCRIPTION

pegasus−transfer takes a list of url pairs, either on stdin or with an input file, determines the correct tool to use for the transfer and executes the transfer. Some of the protocols pegasus−transfer can handle are GridFTP, SRM, Amazon S3, HTTP, and local cp/symlinking. Failed transfers are retried.

Note that pegasus−transfer is a tool mostly used internally in Pegasus workflows, but the tool can be used stand alone as well.

OPTIONS

−h, −−help

Prints a usage summary with all the available command−line options.

−f inputfile, −−file inputfile

File with input pairs. If not given, stdin will be used.

−m, −−max−attempts attempts

Maximum number of attempts for retrying failed transfers.

−t, −−threads number_threads

The number of threads to use. This controls the parallelism of transfers.

−d, −−debug

Enables debugging output.

EXAMPLE

$ pegasus−transfer
# src 1 local_site
file:///etc/hosts
# dst 1 local_site
file:///tmp/foo
CTRL+D

CREDENTIAL HANDLING

Credentials used for transfers can be specified with a combination of comments in the input file format and environment variables. For example, give the following input file:

# src 1 isi
gsiftp://workflow.isi.edu/data/file.dat
# dst 1 tacc_stampede
gsiftp://gridftp.stampede.tacc.utexas.edu/scratch/file.dat

pegasus−transfer will expect either one environment variable specifying one credential to be used on both end of the connection (X509_USER_PROXY), or two separate environment variables specifying two different credentials to be used on the two ends of the connection. The the latter case, the environment variables are derived from the site names provided in the input file commments. In the example above, the environment variables would be named X509_USER_PROXY_isi and X509_USER_PROXY_tacc_stampede

THREADING

In order to speed up data transfers, pegasus−transfer will start a set of transfers in parallel using threads. Threads are turned off when retrying failed transfers.

AUTHOR

Pegasus Team http://pegasus.isi.edu