[Lucene-hadoop Wiki] Update of "hload" by honkliu

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#FORMAT plain
hload(1)                      HADOOP                       hload(1)

NAME
        hload - Display load information about cluster hosts in 5 seconds
                        interval.
 
SYNOPSIS
        hload [OPTION]...

DESCRIPTION
        By default, hload displays load information about all hosts in the
        specified cluster. This command will display the host status, cpu
        usage, tmp space, idle time and so on.

        -h
                Disoplay usage information. 

        -jt jobtracker url
                specify the cluster cluster by the jobtracker's url link, for
                example: -jt hostA:3479;hostB:3479 

OUTPUT
        By default, hload display the following fields:

        HOST
                The name of the host. If a host is currently a host of a cluster
                specifed by the command, the host name will be displayed here.

        status
                The current status of the host (In fact, the status of TaskTracker
                daemon). The possilbe values for host status are as the follows. 
                ok
                        The host is available to accept new tasks.
                closed
                        The host is not allowed to accept new tasks any more, but tasks
                        currently running on the host will continue until finished.

        r1m
                The 1-minute exponentially averaged CPU run queue length
 
        r5m
                The 5-minute exponentially averaged CPU run queue length
 
        r15m
                The 15-minute exponentially averaged CPU run queue length
 
        ut%
                The CPU utilization exponentially averaged over the last 5 seconds.
                between 0.00 and 100.00

        pg
                The memory paging rate exponentially averaged over the last minute, in
                pages per second.

        it
                On UNIX, the idle time of the host (keyboard not touched on all logged
                in sessions), in minutes.

        tmp
                The amount of free space in /tmp, in megabytes. 

        swp
                The amount of available SWAP, in megabytes.

        mem
                The amount of available RAM, in megabytes.
EXAMPLE

        % hload
        HOST    status  r1m     r5m     r15m    ut%     pg      it      tmp             swp     mem
        c0101   ok      6.33    3.09    1.16    89.17   207.7   0       202M    509M    216M
        c0102   ok      4.74    1.54    0.54    7.65    6.86    0       553M    509M    74M

AUTHOR
        Written by Shuguang Liu

REPORT BUGS
        Report bugs to <ho...@hotmail.com>

COPYRIGHT
        Copyright (C) 2005-2010 Shuguang Liu's Inc.

        This file is not a free software, all the source codes are protected
        and will not be released to any body or organization without 
        authority. 

SEE ALSO
        hhosts(1), hopen(1), hclose(1), hslot(1)

hload (hadoop utils) 13.0               September 2007