It looks like you're putting that array ref in list context when you want scalar context. Try this: 
my  $hostcount =  scalar(@{$ClusterHostList{ $clusterID }});

[download]
Technically, I don't think you need that "scalar()", but it's good documentation of what you're doing.

In reply to Re: Number of Elements in HoL by perrin
in thread Number of Elements in HoL by Tuna

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