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From Apache Wiki <wikidi...@apache.org>
Subject [Lucene-hadoop Wiki] Update of "hhosts" by honkliu
Date Wed, 24 Oct 2007 03:00:44 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Lucene-hadoop Wiki" for change notification.

The following page has been changed by honkliu:
http://wiki.apache.org/lucene-hadoop/hhosts

New page:
#FORMAT plain
hhosts(1)                      HADOOP                       hhosts(1)

NAME
        hhosts - display current status of the host(s). 
 
SYNOPSIS
        hhosts [-jt trackers:trackers...] [-h]

DESCRIPTION
        By default, hhosts returns the information about all hosts in the
        specified cluster. This command will display the host status, task
        slots 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, hhosts 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.
 
        MAX
                The maximum number of tasks including MAPs and Reduces that can be
                run at the same time for a host. (2*cpu number is recommanded)

        MAP
                The number of MAP tasks currently running on the hosts.

        REDUCE 
                The number of REDUCE tasks currently running on the hosts.

        FAILURE
                The number failed tasks on the host.

        TMP_SPACE
                The amount of free space in /tmp, in megabytes. For MAP/REDUCE jobs,
                this parameter is important. 

EXAMPLE

        % hhosts

        HOST    STATUS  MAX     MAP     REDUCE  FAILURE TMP_SPACE
        c0101   ok      6       6       0       0       218M
        c0102   ok      6       2       4       0       568M

AUTHOR
        Written by Shuguang Liu

REPORT BUGS
        Report bugs to <honkliu@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
        hload(1), hopen(1), hclose(1), hslot(1)

hhosts (hadoop utils) 13.0              October 2007 

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