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Hadoop >> mail # user >> Re: Entropy Pool and HDFS FS Commands Hanging System


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Jon Lederman 2011-01-03, 23:13
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Ted Dunning 2011-01-03, 23:48
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Jon Lederman 2011-01-04, 00:31
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Ted Dunning 2011-01-04, 00:41
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Jon Lederman 2011-01-04, 00:48
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Re: Entropy Pool and HDFS FS Commands Hanging System
On Mon, Jan 3, 2011 at 4:48 PM, Jon Lederman <[EMAIL PROTECTED]> wrote:

> Thanks.  Will try that.  One final question, based on the jstack output I
> sent, is it obvious that the system is blocked due to the behavior of
> /dev/random?

I tried to send you a highlighted markup of your jstack output.

The key thing to look for is some thread reading bytes that nests from
SecureRandom.
> If I just let the FS command run (i.e., hadoop fs -ls), is there any
> guarantee it will eventually return in some relatively finite period of time
> such as hours, or could it potentially take days, weeks, years or eternity?
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It depends on how quiet your machine is.  If it has stuff happening, then it
will unwedge eventually.
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Konstantin Boudnik 2011-01-04, 04:47