chirp_stream_files(1)

NAME

chirp_stream_files - move data to/from chirp servers in parallel

SYNOPSIS

*chirp_stream_files [options] { *

DESCRIPTION

chirp_stream_files is a tool for moving data from one machine to and from many machines, with the option to split or join the file along the way. It is useful for constructing scatter-gather types of applications on top of Chirp.

chirp_stream_files copy duplicates a single file to multiple hosts. The argument names a file on the local filesystem. The command will then open a connection to the following list of hosts, and stream the file to all simultaneously.

chirp_stream_files split divides an ASCII file up among multiple hosts. The first line of is sent to the first host, the second line to the second, and so on, round-robin.

chirp_stream_files join collects multiple remote files into one. The argument is opened for writing, and the remote files for reading. The remote files are read line-by-line and assembled round-robin into the local file.

In all cases, files are accessed in a streaming manner, making this particularly efficient for processing large files. A local file name of - indicates standard input or standard output, so that the command can be used in a pipeline.

OPTIONS

-a --auth Require this authentication mode.
-b --block-size Set transfer buffer size. (default is 1048576 bytes)
-d --debug Enable debugging for this subsystem.
-i --tickes Comma-delimited list of tickets to use for authentication.
-t --timeout Timeout for failure. (default is 3600s)
-v, --version Show program version.
-h, --help Show help text.

ENVIRONMENT VARIABLES

List any environment variables used or set in this section.

EXIT STATUS

On success, returns zero. On failure, returns non-zero.

EXAMPLES

To copy the file mydata to three locations:

% chirp_stream_files copy mydata server1.somewhere.edu /mydata
                                 server2.somewhere.edu /mydata
                                 server2.somewhere.edu /mydata

To split the file mydata into subsets at three locations:

% chirp_stream_files split mydata server1.somewhere.edu /part1
                                  server2.somewhere.edu /part2
                                  server2.somewhere.edu /part3

To join three remote files back into one called newdata:

% chirp_stream_files join newdata server1.somewhere.edu /part1
                                  server2.somewhere.edu /part2
                                  server2.somewhere.edu /part3