Filter nodes inaccessible to Hadoop using Shell scripts

Source: Internet
Author: User

Filter nodes inaccessible to Hadoop using Shell scripts

The hp1 cluster recently used, because the maintenance staff of the cluster is not powerful, the node will always drop one or two after a while. Today, we found that HDFS is in protection mode when Hadoop is restarted.

I decided to filter out all the inaccessible nodes in the slaves node, so I wrote a small script and recorded it here for convenience in the future.

PS: written in C Shell

The Code is as follows:

#! /Bin/csh
If ($ # argv <1) then
Echo "Usage: $0 host_file"
Exit 1
Set NODES = 'cat $1'
Foreach NODE ($ NODES)
Ping-q-c 1 $ NODE>/dev/null
If ($? = 0) then
Echo $ NODE

By the way, a script for ssh check is included:

#! /Bin/csh
Set nodes = 'cat slafs'
Foreach I ($ nodes)
Echo $ I
Ssh $ I exit

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