PT-FIFO-SPLIT(1p) User Contributed Perl Documentation PT-FIFO-SPLIT(1p)
NAME
pt-fifo-split - Split files and pipe lines to a fifo without really splitting.
SYNOPSIS
Usage: pt-fifo-split [options] [FILE ...]
pt-fifo-split splits FILE and pipes lines to a fifo. With no FILE, or when FILE is -, read standard input.
Read hugefile.txt in chunks of a million lines without physically splitting it:
pt-fifo-split --lines 1000000 hugefile.txt
while [ -e /tmp/pt-fifo-split ]; do cat /tmp/pt-fifo-split; done
RISKS
The following section is included to inform users about the potential risks, whether known or unknown, of using this tool. The two main
categories of risks are those created by the nature of the tool (e.g. read-only tools vs. read-write tools) and those created by bugs.
pt-fifo-split creates and/or deletes the "--fifo" file. Otherwise, no other files are modified, and it merely reads lines from the file
given on the command-line. It should be very low-risk.
At the time of this release, we know of no bugs that could cause serious harm to users.
The authoritative source for updated information is always the online issue tracking system. Issues that affect this tool will be marked
as such. You can see a list of such issues at the following URL: http://www.percona.com/bugs/pt-fifo-split
<http://www.percona.com/bugs/pt-fifo-split>.
See also "BUGS" for more information on filing bugs and getting help.
DESCRIPTION
pt-fifo-split lets you read from a file as though it contains only some of the lines in the file. When you read from it again, it contains
the next set of lines; when you have gone all the way through it, the file disappears. This works only on Unix-like operating systems.
You can specify multiple files on the command line. If you don't specify any, or if you use the special filename "-", lines are read from
standard input.
OPTIONS
This tool accepts additional command-line arguments. Refer to the "SYNOPSIS" and usage information for details.
--config
type: Array
Read this comma-separated list of config files; if specified, this must be the first option on the command line.
--fifo
type: string; default: /tmp/pt-fifo-split
The name of the fifo from which the lines can be read.
--force
Remove the fifo if it exists already, then create it again.
--help
Show help and exit.
--lines
type: int; default: 1000
The number of lines to read in each chunk.
--offset
type: int; default: 0
Begin at the Nth line. If the argument is 0, all lines are printed to the fifo. If 1, then beginning at the first line, lines are
printed (exactly the same as 0). If 2, the first line is skipped, and the 2nd and subsequent lines are printed to the fifo.
--pid
type: string
Create the given PID file. The file contains the process ID of the script. The PID file is removed when the script exits. Before
starting, the script checks if the PID file already exists. If it does not, then the script creates and writes its own PID to it. If
it does, then the script checks the following: if the file contains a PID and a process is running with that PID, then the script dies;
or, if there is no process running with that PID, then the script overwrites the file with its own PID and starts; else, if the file
contains no PID, then the script dies.
--statistics
Print out statistics between chunks. The statistics are the number of chunks, the number of lines, elapsed time, and lines per second
overall and during the last chunk.
--version
Show version and exit.
ENVIRONMENT
The environment variable "PTDEBUG" enables verbose debugging output to STDERR. To enable debugging and capture all output to a file, run
the tool like:
PTDEBUG=1 pt-fifo-split ... > FILE 2>&1
Be careful: debugging output is voluminous and can generate several megabytes of output.
SYSTEM REQUIREMENTS
You need Perl, DBI, DBD::mysql, and some core packages that ought to be installed in any reasonably new version of Perl.
BUGS
For a list of known bugs, see http://www.percona.com/bugs/pt-fifo-split <http://www.percona.com/bugs/pt-fifo-split>.
Please report bugs at https://bugs.launchpad.net/percona-toolkit <https://bugs.launchpad.net/percona-toolkit>. Include the following
information in your bug report:
o Complete command-line used to run the tool
o Tool "--version"
o MySQL version of all servers involved
o Output from the tool including STDERR
o Input files (log/dump/config files, etc.)
If possible, include debugging output by running the tool with "PTDEBUG"; see "ENVIRONMENT".
DOWNLOADING
Visit http://www.percona.com/software/percona-toolkit/ <http://www.percona.com/software/percona-toolkit/> to download the latest release of
Percona Toolkit. Or, get the latest release from the command line:
wget percona.com/get/percona-toolkit.tar.gz
wget percona.com/get/percona-toolkit.rpm
wget percona.com/get/percona-toolkit.deb
You can also get individual tools from the latest release:
wget percona.com/get/TOOL
Replace "TOOL" with the name of any tool.
AUTHORS
Baron Schwartz
ABOUT PERCONA TOOLKIT
This tool is part of Percona Toolkit, a collection of advanced command-line tools developed by Percona for MySQL support and consulting.
Percona Toolkit was forked from two projects in June, 2011: Maatkit and Aspersa. Those projects were created by Baron Schwartz and
developed primarily by him and Daniel Nichter, both of whom are employed by Percona. Visit <http://www.percona.com/software/> for more
software developed by Percona.
COPYRIGHT, LICENSE, AND WARRANTY
This program is copyright 2007-2011 Baron Schwartz, 2011-2012 Percona Inc. Feedback and improvements are welcome.
THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
the Free Software Foundation, version 2; OR the Perl Artistic License. On UNIX and similar systems, you can issue `man perlgpl' or `man
perlartistic' to read these licenses.
You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
VERSION
pt-fifo-split 2.1.2
perl v5.14.2 2012-06-15 PT-FIFO-SPLIT(1p)