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From Ted Dunning <tdunn...@maprtech.com>
Subject Re: Entropy Pool and HDFS FS Commands Hanging System
Date Tue, 04 Jan 2011 01:23:13 GMT
On Mon, Jan 3, 2011 at 4:48 PM, Jon Lederman <jon2718@gmail.com> 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?
>
>
It depends on how quiet your machine is.  If it has stuff happening, then it
will unwedge eventually.

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