[
https://jira.duraspace.org/browse/DS-1396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=26983#comment-26983
]
Ian Boston commented on DS-1396:
--------------------------------
A webapp with this code as a context listener
public class SecureRandomContextListener implements ServletContextListener {
@Override
public void contextInitialized(ServletContextEvent sce) {
System.err.println("Context Being initialsed, testing
SecureRandom");
// this should use /dev/urandom and not block
long t = System.currentTimeMillis();
SecureRandom sr = new SecureRandom();
int i = sr.nextInt();
long ttaken = System.currentTimeMillis()-t;
System.err.println("Got first random "+i+" after "+ttaken+"
ms");
try {
t = System.currentTimeMillis();
// this will need seeding and may block
SecureRandom sr2 = SecureRandom.getInstance("SHA1PRNG");
i = sr2.nextInt();
ttaken = System.currentTimeMillis()-t;
System.err.println("Got PSHA1PRNG ran random "+i+"
after "+ttaken+" ms");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
System.err.println("Context Initialsed");
}
@Override
public void contextDestroyed(ServletContextEvent sce) {
System.err.println("Context Being Destroyed");
}
}
produces this output
INFO: Deploying web application directory /dspace3/webapps/test
Context Being initialsed, testing SecureRandom
Got first random 290438140 after 3 ms
Got PSHA1PRNG ran random -204657877 after 0 ms
Context Initialsed
23-Nov-2012 02:32:55 org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-nio-127.0.0.1-8080"]
However,
I have been able to reproduce pauses with another java based app on the box so
this is not an issue with DSpace per se.
> Very slow startup on Linux Platforms
> ------------------------------------
>
> Key: DS-1396
> URL: https://jira.duraspace.org/browse/DS-1396
> Project: DSpace
> Issue Type: Bug
> Affects Versions: 3.0
> Environment: Linux version 2.6.32-38-server (buildd@allspice) (gcc
> version 4.4.3 (Ubuntu 4.4.3-4ubuntu5) )
> /usr/lib/jvm/java-6-sun/bin/java
> -Djava.util.logging.config.file=/usr/local/tomcat7/conf/logging.properties
> -Djava.awt.headless=true -Djava.security.egd=file:/dev/./urandom -Xms256m
> -Xmx800m -XX:PermSize=256m -XX:NewSize=64m -server -XX:+UseConcMarkSweepGC
> -Djava.net.preferIPv4Stack=true
> -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
> -Djava.endorsed.dirs=/usr/local/tomcat7/endorsed -classpath
> /usr/local/tomcat7/bin/bootstrap.jar:/usr/local/tomcat7/bin/tomcat-juli.jar
> -Dcatalina.base=/usr/local/tomcat7 -Dcatalina.home=/usr/local/tomcat7
> -Djava.io.tmpdir=/tmp/tomcat7-tmp org.apache.catalina.startup.Bootstrap start
> Reporter: Ian Boston
> Priority: Critical
>
> I am experiencing extremely slow startup times for DS3-rc3 on Linux with the
> stock sun JVM, and I have experienced total hangs 11:19-15:09 of the JVM with
> perfect operation after the end of the period (no restart of any form was
> required). By slow startup I mean just bringing up solr, xmlui and jspui can
> take 60 minutes.
> I think this is due to /dev/ramdom on the OS not getting sufficient entropy,
> probably caused by the Bouncy Castle crypto APIs or the new SecureRandom() in
> Eperson.
> performing a
> find /
> as root appears to unstick the JVM on startup, pointing to an entropy issue
> (find / will cause disk I/O not from cache generating low level device driver
> entropy)
> Has anyone else seen these issues ?
> Is there a known fix (other than performing a find)
> I have already tried -Djava.security.egd=file:/dev/./urandom
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