Return-Path: Delivered-To: apmail-hadoop-common-user-archive@www.apache.org Received: (qmail 69989 invoked from network); 4 Jan 2011 01:24:05 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 4 Jan 2011 01:24:05 -0000 Received: (qmail 60602 invoked by uid 500); 4 Jan 2011 01:24:02 -0000 Delivered-To: apmail-hadoop-common-user-archive@hadoop.apache.org Received: (qmail 60564 invoked by uid 500); 4 Jan 2011 01:24:02 -0000 Mailing-List: contact common-user-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: common-user@hadoop.apache.org Delivered-To: mailing list common-user@hadoop.apache.org Received: (qmail 60556 invoked by uid 99); 4 Jan 2011 01:24:02 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 04 Jan 2011 01:24:02 +0000 X-ASF-Spam-Status: No, hits=2.2 required=10.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (athena.apache.org: local policy) Received: from [209.85.216.169] (HELO mail-qy0-f169.google.com) (209.85.216.169) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 04 Jan 2011 01:23:54 +0000 Received: by qyk7 with SMTP id 7so15181734qyk.14 for ; Mon, 03 Jan 2011 17:23:33 -0800 (PST) Received: by 10.229.235.143 with SMTP id kg15mr18042878qcb.17.1294104213713; Mon, 03 Jan 2011 17:23:33 -0800 (PST) MIME-Version: 1.0 Received: by 10.220.190.75 with HTTP; Mon, 3 Jan 2011 17:23:13 -0800 (PST) X-Originating-IP: [64.105.168.204] In-Reply-To: <398E5FB8-483D-404C-B11E-701E1051BF47@gmail.com> References: <4711BE65-43F6-4F65-9985-330CEB5FE8E8@gmail.com> <9E0073162FD25B489A01AD86D92D983E0449046B@XMBIL132.northgrum.com> <6F28ED4C-BBF8-4BBB-916B-DB4094962B4C@gmail.com> <9E0073162FD25B489A01AD86D92D983E0449046C@XMBIL132.northgrum.com> <92C819F2-D85C-45BD-B732-0D0A52171A53@gmail.com> <398E5FB8-483D-404C-B11E-701E1051BF47@gmail.com> From: Ted Dunning Date: Mon, 3 Jan 2011 17:23:13 -0800 Message-ID: Subject: Re: Entropy Pool and HDFS FS Commands Hanging System To: common-user@hadoop.apache.org Content-Type: multipart/alternative; boundary=0016e64dda78f5f5280498fb1de4 --0016e64dda78f5f5280498fb1de4 Content-Type: text/plain; charset=ISO-8859-1 On Mon, Jan 3, 2011 at 4:48 PM, Jon Lederman 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. --0016e64dda78f5f5280498fb1de4--