[jira] Commented: (SOLR-2019) Jetty sometimes randomly takes a long time to start

["Chris Male (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-2019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12893196#action_12893196 ] 

Chris Male commented on SOLR-2019:
----------------------------------

It is possible to set Random in the SessionIDManager programmatically using the following code:

{code}
Server server = new Server();
HashSessionIdManager idManager = new HashSessionIdManager();
idManager.setRandom(new Random());
server.setSessionIdManager(idManager);
{code}

> Jetty sometimes randomly takes a long time to start
> ---------------------------------------------------
>
>                 Key: SOLR-2019
>                 URL: https://issues.apache.org/jira/browse/SOLR-2019
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Michael McCandless
>             Fix For: 3.1, 4.0
>
>
> I'm hitting this Jetty issue when running Solr's tests that spawn a Jetty:
>     http://jira.codehaus.org/browse/JETTY-331
> It seems to be caused by this root cause:
>     http://bugs.sun.com/view_bug.do?bug_id=6202721
> Whereby, somehow, Jetty is trying to use cryptographically secure source of randomness to seed seed its HashSessionIdManager.  My box doesn't have enough entropy so the read blocks for sometimes 10s of seconds!
> If I forcefully symlink /dev/random -> /dev/urandom, that fixes the hang.  Likewise, if I edit the JRE's java.security to  set securerandom.source=file:/dev/./urandom, that also fixes it.  But I think we can workaround this more "generally" by doing the workaround suggested in the Jetty issue (pass java.util.Random not java.security.SecureRandom).
> However, it's still not clear how widespread / what evns this issue really affects (besides mine)...

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