Hi,
We are having a problem on our production servers where downloads of
certain files are getting randomly truncated. This includes static
Javascript files, file downloads via servlets, etc, where the file is
more than about 100K. Most of the time the file downloads successfully,
but some randomly get truncated. The truncation doesn't happen in
exactly the same place every time.
I've been able to recreate the issue on our development servers using
Tomcat 8.0.20 with Java 1.8.20 and 1.8.40. I've tried Solaris 10, 11,
SPARC and x64 CPUs and the same issue occurs. I've tested on a fresh
install of Tomcat 8 and dropped in one of our larger Javascript files
into the webapps/ROOT directory and made no other changes. I'm using a
Perl script to continuously download the file and test an md5 hash
against a known good value to test if the download breaks. It also seems
to only occur when the network speed isn't very good. I use the
following command to limit the speed of my network interface:
sudo tc qdisc add dev eth0 root handle 1:0 netem rate 128kbit
I've also tested the same Tomcat on a Redhat 6 server but that appears
to work fine.
If I revert to Tomcat 7.0.59, then Solaris works fine. The problem
appears to only occur with Tomcat 8 on Solaris. I've tried v8.0.14 and
8.0.20 and they both have the problem.
The Perl script is available from
http://dlib-bauer.ucs.ed.ac.uk/testdata.pl
The Javascript file is available from
http://dlib-bauer.ucs.ed.ac.uk/ext-datadownload-20150323_1157.js
Is anyone else running Tomcat 8 on Solaris 10 or 11 with Java 8, or know
of any problems on the platform?
Regards,
--
Andrew Seales
EDINA tel: +44 (0) 131 650 3022
Edinburgh University fax: +44 (0) 131 650 3308
Causewayside House url: http://edina.ac.uk
160 Causewayside email: andrew.sea...@ed.ac.uk
Edinburgh EH9 1PR
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.
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